Package 'preMetabolizer'

Description

preMetabolizer provides helpers for building the environmental time series commonly needed before fitting stream metabolism models. It includes tools to download external meteorological and elevation data, align irregular time series, convert hydrology and atmospheric units, calculate water and gas chemistry quantities, and assemble light and pressure inputs for streamMetabolizer.

Coordinates

Functions that require locations use latitude and longitude in decimal degrees. Latitude ranges from -90 to 90, longitude ranges from -180 to 180, and western longitudes are negative.

Main workflows

• Find and download meteorological data with get_noaa_stations(), closest_noaa_stations(), get_ghcnh(), ncei_data(), get_nasa_data(), and ks_meso_timeseries(). Retrieve mesonet station observations with iem_networks(), iem_current(), iem_obhistory(), tex_meso_stations(), tex_meso_current(), and tex_meso_timeseries().

• Retrieve or calculate site context with get_usgs_elev(), correct_bp(), convert_to_solar_time(), and calc_par().

• Prepare model inputs with even_timesteps(), calc_O2sat(), calc_water_height(), and the built-in example datasets.

• Summarize and check data with flag_z(), calc_exceedance_prob(), calc_cv(), and calc_bin_width().

Built-in datasets

french_creek contains 5-minute dissolved oxygen and water temperature observations for a complete metabolism-preparation example. kings_discharge contains daily USGS discharge, gage height, and water temperature observations for flow-duration and seasonal summaries.

Author(s)

Maintainer: Connor Brown [email protected] (ORCID)

Authors:

• Connor Brown [email protected] (ORCID)

See Also

streamMetabolizer::metab(), https://connorb.github.io/preMetabolizer/, and https://github.com/ConnorB/preMetabolizer/issues.

Description

Computes a suggested bin width for a histogram using one of several classical rules. NA values are silently removed before computation.

Usage

calc_bin_width(x, method = "auto")

Arguments

Details

In all formulae, $R$ denotes the range (diff(range(x))) and $n$ the number of non-NA observations.

The "fd" fallback to Sturges when IQR(x) == 0 avoids a zero-width bin, which can occur with heavily discrete or zero-inflated data.

Value

A single positive numeric value giving the bin width.

Errors

The function aborts with an informative message when:

• x is not a numeric vector.

• method is not a single character string.

• x contains no non-NA values, or only one.

• All non-NA values in x are identical (zero range).

• method = "doane" is requested with fewer than 3 observations (the skewness standard error is undefined for $n < 3$).

• An unrecognised method string is supplied.

Examples

# Continuous data — Freedman-Diaconis
calc_bin_width(rnorm(200), "fd")

# Skewed data — Doane corrects for skewness
calc_bin_width(rexp(200), "doane")

# Discrete / zero-inflated data — FD falls back to Sturges
calc_bin_width(c(rep(0, 50), rep(1, 50)), "fd")

# NA values are silently dropped
calc_bin_width(c(NA, rnorm(100), NA), "scott")

# Compare all methods on the same data
x <- rnorm(500)
methods <- c("auto", "sturges", "fd", "sqrt", "rice", "scott", "doane")
vapply(methods, \(m) calc_bin_width(x, m), numeric(1))

# Error conditions
try(calc_bin_width(letters))               # non-numeric x
try(calc_bin_width(c(1, NA, NA)))          # only one non-NA value
try(calc_bin_width(rep(5, 50)))            # zero range
try(calc_bin_width(rnorm(200), "badrule")) # unknown method
try(calc_bin_width(c(1, 2), "doane"))      # doane needs n >= 3

Description

Calculates the dissolved methane concentration in equilibrium with the atmosphere from water temperature, barometric pressure, and salinity, using the atmospheric-equilibrium solubility equation of Wiesenburg and Guinasso (1979).

Usage

calc_CH4sat(
  temp_water,
  atmo_press,
  units = "atm",
  salinity = 0,
  xCH4_ppm = 1.9,
  out_units = "umol/L"
)

Arguments

Details

The equilibrium concentration follows Wiesenburg and Guinasso (1979) eq 7 with their volumetric (nmol/L) coefficients (Table VI), in which the dry-air mole fraction enters the solubility equation directly. A vapor-pressure correction scales the 1 atm result to the supplied barometric pressure.

Value

Numeric vector of dissolved CH4 saturation in the requested units.

References

Wiesenburg, D.A., and Guinasso, N.L. (1979). Equilibrium solubilities of methane, carbon monoxide, and hydrogen in water and sea water. Journal of Chemical and Engineering Data, 24(4), 356-360.

See Also

calc_O2sat(), calc_CO2sat(), calc_N2Osat()

Examples

calc_CH4sat(temp_water = 20, atmo_press = 1, salinity = 0)

calc_CH4sat(
  temp_water = c(5, 15, 25),
  atmo_press = 101.325,
  units = "kPa",
  xCH4_ppm = 1.9,
  out_units = "mg/L"
)

Description

Converts a measured or modeled CO2 mole fraction to dissolved CO2 concentration in mg/L. This is a volume-based companion to calc_CO2_molKg() and uses water density to convert from mol/kg.

Usage

calc_CO2_mgL(
  CO2_ppm,
  temp_water,
  waterDepth_m,
  atmo_press,
  press_units,
  salinity = 0
)

Arguments

Value

Numeric vector of dissolved CO2 concentration in mg/L.

See Also

calc_CO2_molKg(), xCO2_to_pCO2(), calc_water_density()

Examples

calc_CO2_mgL(
  CO2_ppm = c(420, 800, 1200),
  temp_water = 20,
  waterDepth_m = 0.5,
  atmo_press = 101.325,
  press_units = "kPa"
)

Description

Converts a measured or modeled CO2 mole fraction to dissolved CO2 concentration using atmospheric pressure, water-column pressure, vapor pressure, and the Weiss (1974) CO2 solubility coefficient.

Usage

calc_CO2_molKg(
  CO2_ppm,
  temp_water,
  waterDepth_m,
  atmo_press,
  press_units,
  salinity = 0
)

Arguments

Value

Numeric vector of dissolved CO2 concentration in mol/kg.

See Also

calc_CO2_mgL(), xCO2_to_pCO2(), calc_K0()

Examples

calc_CO2_molKg(
  CO2_ppm = 420,
  temp_water = 20,
  waterDepth_m = 0.5,
  atmo_press = 101.325,
  press_units = "kPa"
)

Description

Calculates the dissolved carbon dioxide concentration in equilibrium with the atmosphere from water temperature, barometric pressure, and salinity, using the Weiss and Price (1980) solubility function for carbon dioxide as a non-ideal atmospheric trace gas.

Usage

calc_CO2sat(
  temp_water,
  atmo_press,
  units = "atm",
  salinity = 0,
  xCO2_ppm = 420,
  out_units = "umol/L"
)

Arguments

Details

The equilibrium concentration is $C^* = x' F$, where $x'$ is the dry-air mole fraction and $F$ is the moist-air solubility function of Weiss and Price (1980), evaluated with their volumetric coefficients (Table VI). A vapor-pressure correction scales the 1 atm result to the supplied barometric pressure. To convert a measured CO2 mole fraction (rather than the atmospheric value) to a dissolved concentration, see calc_CO2_molKg().

Value

Numeric vector of dissolved CO2 saturation in the requested units.

References

Weiss, R.F., and Price, B.A. (1980). Nitrous oxide solubility in water and seawater. Marine Chemistry, 8, 347-359.

See Also

calc_O2sat(), calc_CH4sat(), calc_N2Osat(), calc_CO2_molKg()

Examples

calc_CO2sat(temp_water = 20, atmo_press = 1, salinity = 0)

calc_CO2sat(
  temp_water = c(5, 15, 25),
  atmo_press = 101.325,
  units = "kPa",
  xCO2_ppm = 420,
  out_units = "mg/L"
)

Description

Computes the coefficient of variation (CV), a unitless measure of relative variability. By default, the result is returned as a percentage.

Usage

calc_cv(x, na.rm = TRUE, as_percent = TRUE, robust = FALSE)

Arguments

Value

A single numeric CV value, or NA_real_ when the input is non-numeric, empty, all missing after NA removal, or centered on zero. Problematic inputs also produce a warning.

Examples

discharge <- c(0.12, 0.18, 0.15, 1.4, 0.09)

calc_cv(discharge)
calc_cv(discharge, as_percent = FALSE)
calc_cv(discharge, robust = TRUE)

Description

Calculates exceedance probabilities for a discharge vector with the Weibull plotting-position formula. Higher flows receive lower exceedance probabilities.

Usage

calc_exceedance_prob(flow, rm.zero = FALSE)

Arguments

Details

The Weibull plotting position is:

$P = \frac{\mathrm{rank}}{n + 1}$

where rank is the descending rank of the flow value and n is the number of ranked observations.

Value

Numeric vector of exceedance probabilities with the same length as flow. Missing input values return NA.

Examples

flow_data <- c(10, 5, 0, 15, 8, NA, 0, 20)

calc_exceedance_prob(flow_data)
calc_exceedance_prob(flow_data, rm.zero = TRUE)

Description

Calculates the Weiss (1974) CO2 solubility coefficient, K0, for water at the supplied temperature, salinity, atmospheric pressure, and water depth. The depth and atmospheric pressure terms apply a pressure correction for the total pressure at the sensor.

Usage

calc_K0(temp_water, waterDepth_m = 0, atmo_press = 1, salinity = 0)

Arguments

Value

Numeric vector of K0 values in mol/(kg atm).

References

Weiss, R.F. (1974). Carbon dioxide in water and seawater: the solubility of a non-ideal gas. Marine Chemistry, 2, 203-215.

Examples

calc_K0(temp_water = 20)
calc_K0(temp_water = c(5, 15, 25), waterDepth_m = 1, salinity = 0)

Description

Finds the most frequent value in an atomic vector. Ties can be handled by returning the first mode, last mode, a random mode, or all modes.

Usage

calc_mode(x, na.rm = TRUE, multi = "first")

Arguments

Details

For factors, returned mode values preserve the original levels. When na.rm = FALSE, missing values are included in the frequency table.

Value

A value or vector with the same general type as x. Returns NA for empty inputs or inputs containing only missing values after NA removal.

See Also

table() for frequency tables.

Examples

calc_mode(c(1, 2, 2, 3, 3, 3))

tied <- c("riffle", "run", "riffle", "pool", "run")
calc_mode(tied)
calc_mode(tied, multi = "all")

fruit <- factor(c("apple", "banana", "banana", "cherry"))
calc_mode(fruit)

Description

Calculates the dissolved nitrous oxide concentration in equilibrium with the atmosphere from water temperature, barometric pressure, and salinity, using the Weiss and Price (1980) solubility function for nitrous oxide as a non-ideal atmospheric trace gas.

Usage

calc_N2Osat(
  temp_water,
  atmo_press,
  units = "atm",
  salinity = 0,
  xN2O_ppm = 0.338,
  out_units = "umol/L"
)

Arguments

Details

The equilibrium concentration is $C^* = x' F$, where $x'$ is the dry-air mole fraction and $F$ is the moist-air solubility function of Weiss and Price (1980), evaluated with their volumetric coefficients (Table II). A vapor-pressure correction scales the 1 atm result to the supplied barometric pressure.

Value

Numeric vector of dissolved N2O saturation in the requested units.

References

Weiss, R.F., and Price, B.A. (1980). Nitrous oxide solubility in water and seawater. Marine Chemistry, 8, 347-359.

See Also

calc_O2sat(), calc_CO2sat(), calc_CH4sat()

Examples

calc_N2Osat(temp_water = 20, atmo_press = 1, salinity = 0)

calc_N2Osat(
  temp_water = c(5, 15, 25),
  atmo_press = 101.325,
  units = "kPa",
  xN2O_ppm = 0.338,
  out_units = "mg/L"
)

Description

Calculates the dissolved oxygen concentration in equilibrium with the atmosphere from water temperature, barometric pressure, and salinity. This is the DO.sat quantity commonly required by stream metabolism models.

Usage

calc_O2sat(
  temp_water,
  atmo_press,
  units = "atm",
  salinity = 0,
  out_units = "mg/L"
)

Arguments

Details

The calculation uses the Benson and Krause umol/kg fit reported by Garcia and Gordon (1992), applies a vapor-pressure correction for non-standard barometric pressure, and converts from mass-based concentration to a volume basis with a salinity-aware density correction.

Value

Numeric vector of dissolved oxygen saturation in the requested units.

References

Garcia, H.E., and Gordon, L.I. (1992). Oxygen solubility in seawater: better fitting equations. Limnology and Oceanography, 37(6), 1307-1312.

See Also

calc_CO2sat(), calc_CH4sat(), calc_N2Osat()

Examples

calc_O2sat(temp_water = 15, atmo_press = 1, units = "atm")

calc_O2sat(
  temp_water = c(5, 15, 25),
  atmo_press = c(101.2, 100.8, 100.5),
  units = "kPa"
)

# Return micromoles per liter instead of mg/L
calc_O2sat(temp_water = 15, atmo_press = 1, out_units = "umol/L")

Description

Calculate photosynthetically active radiation (PAR) for a series of date-times and site coordinates. Input times should be mean solar time, as expected by stream metabolism models. Renamed from calc_light() to avoid shadowing streamMetabolizer::calc_light().

Usage

calc_par(solar_time, latitude, longitude, max_par = 2326)

Arguments

Details

This function was adapted from streamMetabolizer::calc_light and is included here under the terms of the CC0 1.0 Universal public domain dedication, as described at: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Original citation: Appling, A. P., Hall, R. O., Yackulic, C. B., & Arroita, M. (2018). Overcoming Equifinality: Leveraging Long Time Series for Stream Metabolism Estimation. Journal of Geophysical Research: Biogeosciences, 123(2), 624-645. https://doi.org/10.1002/2017JG004140

The original implementation routed PAR through SW and back via the LakeMetabolizer::par.to.sw.base() / sw.to.par.base() linear factors (par * 0.473 and sw * 2.114). Because those factors are reciprocals the round-trip cancels exactly, so the conversion has been inlined and the streamMetabolizer / LakeMetabolizer dependency removed from this function.

The solar zenith angle at each timestamp is computed via SunCalcMeeus::sun_zenith_angle() (Meeus's algorithms), and PAR is modeled as max_par * cos(zenith) clipped at zero. The mean solar input is converted back to UTC for the zenith calculation via the standard 15 deg / hour longitude offset.

Value

Numeric vector of modeled PAR in umol m^-2 s^-1.

References

Britton, C. M. and Dodd, J. D. (1976). Relationships of photosynthetically active radiation and shortwave irradiance. Agricultural Meteorology, 17(1), 1-7. (Source of the 0.473 W m^-2 per umol m^-2 s^-1 PAR-SW factor.)

Examples

utc <- as.POSIXct("2024-06-21 18:00:00", tz = "UTC")
solar_time <- convert_to_solar_time(utc, longitude = -96.6)

calc_par(solar_time, latitude = 39.1, longitude = -96.6)

Description

Calculates the vapor pressure of freshwater or seawater in atmospheres.

Usage

calc_vapor_press(temp_water = 25, salinity = 0, method = "Dickson2007")

Arguments

Details

"Dickson2007" follows the ocean CO2 best-practices guide and includes a salinity correction. "MIMSY" uses the Antoine equation for freshwater.

Value

Numeric vector of vapor pressure in atm.

References

Dickson, A.G., Sabine, C.L., and Christian, J.R. (Eds.) (2007). Guide to best practices for ocean CO2 measurements. PICES Special Publication 3.

Kelly, M.C. (2024). mimsy: Calculate MIMS Dissolved Gas Concentrations Without Getting a Headache. R package version 0.6.5. https://CRAN.R-project.org/package=mimsy

Examples

calc_vapor_press(temp_water = 25, salinity = 35, method = "Dickson2007")
calc_vapor_press(temp_water = 20, salinity = 0, method = "MIMSY")

Description

Calculates the density of pure water (kg/m^3) from temperature in degrees Celsius using the polynomial approximation of Kell (1975). Valid for temperatures between 0°C and 150°C at atmospheric pressure.

Usage

calc_water_density(water_temp)

Arguments

Value

Numeric vector of water density in kg/m^3.

References

Kell, G. S. (1975). Density, thermal expansivity, and compressibility of liquid water from 0° to 150°C: Correlations and tables for atmospheric pressure and saturation reviewed and expressed on 1968 temperature scale. Journal of Chemical and Engineering Data, 20(1), 97–105. doi:10.1021/je60064a005

Examples

calc_water_density(15)
calc_water_density(c(0, 10, 20, 30))

Description

Converts pressure readings from vented or unvented water-level sensors to water height in meters.

Usage

calc_water_height(sensor_kPa, atmo_kPa = NULL, water_temp, type = "vented")

Arguments

Details

The pressure difference is divided by water density and gravitational acceleration. Water density is calculated with calc_water_density().

Value

Numeric vector of water height in meters.

References

Kell, G. S. (1975). Density, thermal expansivity, and compressibility of liquid water from 0° to 150°C: Correlations and tables for atmospheric pressure and saturation reviewed and expressed on 1968 temperature scale. Journal of Chemical and Engineering Data, 20(1), 97-105. doi:10.1021/je60064a005

Examples

calc_water_height(sensor_kPa = 19.2, water_temp = 15, type = "vented")

calc_water_height(
  sensor_kPa = 120.5,
  atmo_kPa = 101.3,
  water_temp = 15,
  type = "unvented"
)

Description

These functions wrap the seven endpoints of NOAA's Climate Data Online Web Services v2 API (⁠https://www.ncei.noaa.gov/cdo-web/api/v2⁠). They retrieve observations (cdo_data()), search the station catalog (cdo_stations()), and browse the metadata catalog (cdo_datasets(), cdo_datacategories(), cdo_datatypes(), cdo_locationcategories(), cdo_locations()).

Usage

cdo_datasets(
  id = NULL,
  datatypeid = NULL,
  locationid = NULL,
  stationid = NULL,
  startdate = NULL,
  enddate = NULL,
  sortfield = NULL,
  sortorder = NULL,
  max_results = Inf
)

cdo_datacategories(
  id = NULL,
  datasetid = NULL,
  locationid = NULL,
  stationid = NULL,
  startdate = NULL,
  enddate = NULL,
  sortfield = NULL,
  sortorder = NULL,
  max_results = Inf
)

cdo_datatypes(
  id = NULL,
  datasetid = NULL,
  locationid = NULL,
  stationid = NULL,
  datacategoryid = NULL,
  startdate = NULL,
  enddate = NULL,
  sortfield = NULL,
  sortorder = NULL,
  max_results = Inf
)

cdo_locationcategories(
  id = NULL,
  datasetid = NULL,
  startdate = NULL,
  enddate = NULL,
  sortfield = NULL,
  sortorder = NULL,
  max_results = Inf
)

cdo_locations(
  id = NULL,
  datasetid = NULL,
  locationcategoryid = NULL,
  datacategoryid = NULL,
  startdate = NULL,
  enddate = NULL,
  sortfield = NULL,
  sortorder = NULL,
  max_results = Inf
)

cdo_stations(
  id = NULL,
  datasetid = NULL,
  locationid = NULL,
  datacategoryid = NULL,
  datatypeid = NULL,
  extent = NULL,
  startdate = NULL,
  enddate = NULL,
  sortfield = NULL,
  sortorder = NULL,
  max_results = Inf
)

cdo_data(
  datasetid,
  startdate,
  enddate,
  datatypeid = NULL,
  locationid = NULL,
  stationid = NULL,
  units = "metric",
  sortfield = NULL,
  sortorder = NULL,
  includemetadata = FALSE,
  max_results = Inf
)

Arguments

Value

A tibble for list queries, or a named list for single-resource (id-based) queries. Date-like columns (mindate, maxdate, date) are parsed to Date / POSIXct and numeric columns (latitude, longitude, elevation, value, datacoverage) are coerced to numeric.

Authentication

All CDO endpoints require a free API token. Request one at https://www.ncdc.noaa.gov/cdo-web/token and store it in the API_NCEI_CDO environment variable, for example by adding API_NCEI_CDO=... to your ⁠~/.Renviron⁠.

Pagination

List endpoints paginate at 1000 results per page. By default each function transparently walks all pages and returns a single tibble. Use max_results to cap the total number of rows returned.

Rate limits

Each token is limited to 5 requests per second and 10,000 requests per day. The 5/s cap is enforced client-side via httr2::req_throttle() (requests block briefly rather than failing). The package also tracks a session-local counter; once 10,000 successful requests have been made in the current R session the next call aborts with an error directing you to cdo_reset_request_count(). The counter is best-effort and does not include requests made by other R sessions or tools.

See Also

ncei_data() and ncei_stations() for the parallel NCEI Access Data Service (no token required, different endpoint structure).

Examples

## Not run: 
cdo_datasets()
cdo_datasets("GHCND")

## End(Not run)
## Not run: 
cdo_datacategories(datasetid = "GHCND")

## End(Not run)
## Not run: 
cdo_datatypes(datasetid = "GHCND", datacategoryid = "TEMP")
cdo_datatypes("TMAX")

## End(Not run)
## Not run: 
cdo_locationcategories()
cdo_locationcategories("ST")

## End(Not run)
## Not run: 
cdo_locations(locationcategoryid = "ST")
cdo_locations("FIPS:37")

## End(Not run)
## Not run: 
cdo_stations(locationid = "FIPS:37", datasetid = "GHCND")
cdo_stations("GHCND:USW00013722")

## End(Not run)
## Not run: 
cdo_data(
  datasetid = "GHCND",
  stationid = "GHCND:USW00013722",
  startdate = "2024-01-01",
  enddate   = "2024-01-31",
  datatypeid = c("TMAX", "TMIN")
)

## End(Not run)

Description

The NCEI CDO Web Services v2 API enforces a daily limit of 10,000 requests per token. The package counts every successful CDO request made in the current R session and aborts further requests once the limit is reached. These helpers expose the counter.

Usage

cdo_request_count()

cdo_reset_request_count()

Details

Because the API does not report remaining quota, the counter is session-local and best-effort: it does not include requests made by other R sessions, other tools, or earlier sessions on the same day.

Value

cdo_request_count() returns an integer count of successful CDO requests made this session. cdo_reset_request_count() is called for its side effect of zeroing the counter and returns the prior count invisibly.

See Also

cdo_data() and friends.

Description

Identifies NOAA GHCND weather stations within a specified radius of a target location. Station candidates are retrieved via the NCEI Search API using a bounding box and then filtered to the exact circular radius using geodesic distance.

Usage

closest_noaa_stations(
  latitude,
  longitude,
  dist_km,
  start_date = NULL,
  end_date = NULL,
  data_types = NULL
)

Arguments

Details

Distances are calculated with geosphere::distGeo() using the default WGS84 ellipsoid.

The search first queries the NCEI Search API using a square bounding box of side 2 * dist_km centred on the target point, then trims the result to the circular radius. This requires one API call and avoids downloading the entire station database.

Value

A tibble of NOAA stations within dist_km, sorted by ascending distance. The first column is distance_km; remaining columns are those returned by get_noaa_stations() (station_id, station_name, latitude, longitude, start_date, end_date). Returns NULL when no stations are found within the requested radius.

See Also

get_noaa_stations(), ncei_bbox(), ncei_stations()

Examples

## Not run: 
# Stations within 50 km of Konza Prairie Biological Station
closest_noaa_stations(
  latitude = 39.1068806,
  longitude = -96.6117151,
  dist_km = 50
)

# Restrict to stations with daily temperature data since 2000
closest_noaa_stations(
  latitude = 39.1068806,
  longitude = -96.6117151,
  dist_km = 100,
  data_types = c("TMAX", "TMIN"),
  start_date = "2000-01-01"
)

## End(Not run)

Description

Converts stream discharge measurements between cubic feet per second (cfs), cubic meters per second (cms), and liters per second (lps). Always returns a plain numeric vector.

Usage

convert_flow(flow, from, to = "cms")

Arguments

Value

Numeric vector of stream discharge in the requested unit.

Examples

convert_flow(14.32, from = "cfs", to = "cms")
convert_flow(14.32, from = "cfs", to = "lps")
convert_flow(c(10, 20, 30), from = "cfs", to = "cms")

Description

Converts barometric pressure from one unit to another using exact conversion factors. Always returns a plain numeric vector.

Usage

convert_pressure(pressure, from, to = "atm")

Arguments

Value

Numeric vector of barometric pressure in the requested unit.

Examples

convert_pressure(101.3, from = "kPa", to = "atm")
convert_pressure(1013.25, from = "hPa", to = "Pa")

Description

Converts a datetime to mean or apparent (true) solar time at a given longitude. Mean solar time uses a constant 15 deg/hour longitude offset. Apparent solar time additionally applies the equation of time and is computed via SunCalcMeeus::solar_time().

Usage

convert_to_solar_time(dateTime, longitude, type = c("mean", "apparent"))

convert_from_solar_time(
  solar_datetime,
  longitude,
  type = c("mean", "apparent")
)

Arguments

Details

These helpers are named convert_to_solar_time() / convert_from_solar_time() to avoid shadowing the original streamMetabolizer::convert_UTC_to_solartime() and streamMetabolizer::convert_solartime_to_UTC(), which can still be called directly from streamMetabolizer if you need their behaviour.

The mean offset is longitude / 15 * 3600 seconds. The apparent path delegates to SunCalcMeeus::solar_time(), which applies the equation of time using Meeus's algorithms.

convert_from_solar_time() inverts the forward conversion by computing the forward offset at the input solar instant and subtracting it. This is exact for type = "mean". For type = "apparent" it is accurate to within roughly the daily change in the equation of time (~30 s/day), which is well below typical sensor sampling intervals.

Value

A POSIXct vector with class c("solar_date", "POSIXct", "POSIXt") (convert_to_solar_time()) or c("POSIXct", "POSIXt") (convert_from_solar_time()). The tzone attribute is "UTC" in both cases; the clock reading carries the meaning.

See Also

SunCalcMeeus::solar_time(), streamMetabolizer::convert_UTC_to_solartime(), streamMetabolizer::convert_solartime_to_UTC().

Examples

utc <- as.POSIXct("2024-06-21 18:00:00", tz = "UTC")

convert_to_solar_time(utc, longitude = -96.6)
convert_to_solar_time(utc, longitude = -96.6, type = "apparent")

# A non-UTC POSIXct gives the same result, since the underlying instant
# is what matters.
local <- as.POSIXct("2024-06-21 13:00:00", tz = "America/Chicago")
convert_to_solar_time(local, longitude = -96.6)

solar <- convert_to_solar_time(utc, longitude = -96.6)
convert_from_solar_time(solar, longitude = -96.6)

Description

Adjusts barometric pressure from one elevation to another using the barometric formula. Always returns a plain numeric vector.

Usage

correct_bp(
  station_bp,
  air_temp,
  station_elev,
  site_elev,
  from_units = "kPa",
  to_units = "kPa"
)

Arguments

Value

Numeric vector of corrected barometric pressure in to_units.

See Also

convert_pressure() for supported pressure units.

Examples

correct_bp(
  station_bp = c(101.3, 100.5), air_temp = c(15, 10),
  station_elev = 300, site_elev = 500
)

Description

Builds a complete timestamp sequence for logger data and joins the original observations onto it. Missing timestamps become explicit rows with NA values in the measured columns.

Usage

even_timesteps(loggerData, datetime_col = "DateTime_UTC", site_col = NULL)

Arguments

Details

The time step is inferred from the sorted unique timestamps for each site. Use this after removing obvious duplicate or invalid timestamps.

Value

A data frame or tibble, matching the input class, with all original rows plus inserted NA rows for missing time steps.

Examples

df <- data.frame(
  DateTime_UTC = as.POSIXct(
    c("2024-01-01 00:00", "2024-01-01 01:00", "2024-01-01 03:00"),
    tz = "UTC"
  ),
  temp_C = c(10.1, 10.4, 10.5)
)

even_timesteps(df)

df_multi <- data.frame(
  DateTime_UTC = c(
    as.POSIXct(
      c("2024-01-01 00:00", "2024-01-01 01:00", "2024-01-01 03:00"),
      tz = "UTC"
    ),
    as.POSIXct(c("2024-01-01 00:00", "2024-01-01 00:30"), tz = "UTC")
  ),
  Site = c("A", "A", "A", "B", "B")
)

even_timesteps(df_multi, site_col = "Site")

Description

Identifies potential outliers in a numeric vector based on a moving window robust Z-score approach. The robust Z-score is computed using a biweight scale estimate centered on the median.

Usage

flag_z(x, width = 5, threshold = 3, return_z = FALSE)

Arguments

Details

For each value in x, a window of length width centered on that value is extracted. The function:

• Computes the median of the window.

• Calculates residuals from the median and MAD-based scale.

• Estimates a robust scale using the Tukey biweight midvariance with tuning constant c = 9 (Mosteller & Tukey 1977; Lax 1985):

  $s^2 = n \cdot \frac{\sum r_i^2 (1 - u_i^2)^4}{\left[\sum (1 - u_i^2)(1 - 5 u_i^2)\right]^2}$

  where $u_i = r_i / (c \cdot \mathrm{MAD})$ and the sums run over $|u_i| < 1$.

• Computes a Z-score as $(x_i - \text{median}) / s$.

If the absolute value of the Z-score exceeds threshold, the value is flagged with "Z".

NA values are ignored in the window statistics but retained in output positions.

Value

If return_z = TRUE, a list with:

z

A numeric vector of robust Z-scores (with NA where not computable).

flag

A character vector of the same length as x, with "Z" where an outlier is detected and NA otherwise.

If return_z = FALSE, only the flag vector is returned.

References

Mosteller, F. and Tukey, J. W. (1977). Data Analysis and Regression. Addison-Wesley.

Lax, D. A. (1985). Robust estimators of scale: Finite-sample performance in long-tailed symmetric distributions. Journal of the American Statistical Association, 80(391), 736–741.

See Also

stats::mad(), stats::median()

Examples

x <- c(1, 2, 1.5, 1.2, 100, 1.1, 1.3, 1.4)
flag_z(x)
flag_z(x, return_z = TRUE)

Description

Dissolved oxygen and water temperature measured at 5-minute intervals on French Creek near Laramie, Wyoming, USA during summer/fall 2012. Data were collected as part of a stream metabolism study.

Usage

french_creek

Format

A tibble with 10,883 rows and 4 columns:

datetime

POSIXct. Date and time in UTC (original timezone: MDT, UTC-6).

sonde

Character. Sensor identifier. "REZN" was deployed 8/23/2012 through 9/1/2012 12:50 MDT; "TOWN" from 9/1/2012 12:55 MDT through 9/30/2012. Approximately 15% of rows have NA in temp_C and DO_mgL.

temp_C

Numeric. Water temperature in degrees Celsius. Some anomalous negative values are present in the raw data and have not been filtered.

DO_mgL

Numeric. Dissolved oxygen concentration in mg/L.

Details

Site information (constant across all rows):

• Latitude: 41.33 N

• Longitude: -106.3 W

• Stream depth: 0.16 m

• Elevation: approximately 3,115 m (10220 ft)

• Location: French Creek, Laramie, Wyoming, USA

The two sonde values indicate a mid-study sensor swap on September 1, 2012. For most analyses, filter to a single sonde or treat the transition as a potential data break.

Source

Hotchkiss, E. R., & Hall, R. O., Jr. (2015). Whole-stream 13C tracer addition reveals distinct fates of newly fixed carbon. Ecology, 96, 403–416. doi:10.1890/14-0631.1

Description

Downloads Global Historical Climatology Network hourly (GHCNh) data for one or more stations and a date range, returning a parsed tibble ready for use in stream metabolism modelling.

Usage

get_ghcnh(stations, start_date, end_date, quiet = FALSE)

Arguments

Details

GHCNh v1.1.0 data are served as pipe-separated (PSV) files from the NOAA NCEI archive, one file per station per year. Data are current through the present year. The function downloads all station-year combinations covering the requested date range in parallel.

Sentinel values of -9999 are converted to NA. Columns that are all NA are removed.

Multiple stations and years are downloaded in parallel using up to four concurrent connections.

Value

A tibble with one row per station-hour. Key columns include:

station_id

Station identifier.

station_name

Station name (when available).

datetime

Observation time as a UTC POSIXct.

temperature

Air temperature in degrees Celsius.

dew_point_temperature

Dew-point temperature (°C).

relative_humidity

Relative humidity (%).

wind_direction

Wind direction (degrees clockwise from north).

wind_speed

Wind speed (m/s).

sea_level_pressure

Sea-level pressure (hPa).

precipitation

Precipitation (mm).

Columns that are entirely NA across all stations and hours are dropped from the result.

See Also

get_noaa_stations(), closest_noaa_stations(), ncei_data()

Examples

## Not run: 
# Fetch WY 2025 hourly data for a station near Konza Prairie
konza <- closest_noaa_stations(
  latitude = 39.1068806,
  longitude = -96.6117151,
  dist_km = 50
)
hourly <- get_ghcnh(
  stations = konza$station_id[1],
  start_date = "2024-10-01",
  end_date = "2025-09-30"
)

## End(Not run)

Description

Downloads hourly meteorological data from the NASA POWER project for the date range covered by a time-series data frame and interpolates the result to the input timestamps.

Usage

get_nasa_data(
  data,
  datetime_col = "dateTime",
  site_col = NULL,
  latitude = NULL,
  longitude = NULL,
  elev_m = NULL,
  params = c("PSC", "ALLSKY_SFC_SW_DWN", "PRECTOTCORR", "T2M"),
  max_attempts = 5,
  quiet = TRUE,
  lat = lifecycle::deprecated(),
  lon = lifecycle::deprecated()
)

Arguments

Value

A tibble interpolated to the non-missing timestamps in data, with columns:

Site column

Site names in the column named by site_col, when supplied

dateTime

timestamps from data in UTC

PSC

Elevation-corrected barometric pressure (kPa)

ALLSKY_SFC_SW_DWN

All Sky Surface Shortwave Downward Irradiance (W/m²), when requested

light.obs

Observed photosynthetically active radiation (µmol/m²/s), converted from ALLSKY_SFC_SW_DWN when requested

T2M

Average air temperature at 2 m above the surface (°C)

PRECTOTCORR

MERRA-2 bias corrected total precipitation (mm/hr)

Examples

## Not run: 
stream_data <- data.frame(
  dateTime = as.POSIXct("2024-06-01 12:00:00", tz = "UTC")
)

get_nasa_data(
  stream_data,
  latitude = 39.1,
  longitude = -96.6,
  elev_m = 320
)

site_data <- data.frame(
  site = c("a", "b"),
  dateTime = as.POSIXct(c(
    "2024-06-01 12:00:00",
    "2024-06-01 12:00:00"
  ), tz = "UTC"),
  latitude = c(39.1, 40.0),
  longitude = c(-96.6, -97.2),
  elev_m = c(320, 340)
)

get_nasa_data(site_data, site_col = "site")

## End(Not run)

Description

Searches for NOAA weather stations in the NCEI daily-summaries (GHCND) dataset using the NCEI Search Service API. This is the preferred way to find station identifiers before downloading data with ncei_data() or get_ghcnh().

Usage

get_noaa_stations(
  bbox = NULL,
  start_date = NULL,
  end_date = NULL,
  data_types = NULL,
  text = NULL,
  limit = 1000L,
  offset = 0L
)

Arguments

Details

Station identifiers in station_id are bare GHCND IDs (e.g., "USW00023183") stripped of their "GHCND:" prefix. Pass them directly to ncei_data() or get_ghcnh().

This function replaces the previous MSHR flat-file approach. Station metadata is now retrieved on demand from the NCEI Search Service API rather than downloaded as a large fixed-width archive.

For distance-based searches use closest_noaa_stations(), which builds the bounding box from a latitude, longitude, and search radius.

Value

A tibble with columns station_id, station_name, latitude, longitude, start_date, and end_date. Returns an empty tibble when no stations match the query.

See Also

closest_noaa_stations(), ncei_bbox(), ncei_stations(), ncei_data(), get_ghcnh()

Examples

## Not run: 
# All GHCND stations in a region
get_noaa_stations(bbox = c(40, -100, 38, -98))

# Stations with at least temperature data since 2000
get_noaa_stations(
  data_types = c("TMAX", "TMIN"),
  start_date = "2000-01-01"
)

## End(Not run)

Description

Classifies dates into astronomical seasons using the precise dates of equinoxes and solstices for each year, computed from Meeus's "Astronomical Algorithms" (Willmann-Bell, 1991), chapter 26.

Usage

get_season(date, hemisphere = c("north", "south"), labels = NULL)

Arguments

Details

A mean Julian Ephemeris Day for each equinox and solstice is computed from the Table 26.B polynomial and refined by the 24-term periodic correction in Table 26.C. The corrected instant is accurate to roughly a minute and is then rounded to a calendar date in UTC. The formulas are valid for years 1000-3000.

Southern-hemisphere seasons are the northern seasons offset by six months. For example, dates after the March equinox and before the June solstice are northern spring but southern autumn.

Value

An ordered factor with levels Spring < Summer < Autumn < Winter (or the user-supplied equivalents), the same length as date. NA in input produces NA in output.

Examples

get_season(as.Date(c("2024-03-19", "2024-06-20", "2024-09-22", "2024-12-21")))

get_season(Sys.time())

# Southern hemisphere
get_season(as.Date("2024-07-15"), hemisphere = "south")

# Custom labels
get_season(as.Date("2024-09-22"), labels = c(autumn = "Fall"))

Description

Queries the USGS Elevation Point Query Service for one or more latitude and longitude pairs. Coordinates are interpreted as WGS84 (WKID 4326). Requests are performed in parallel for improved performance when querying multiple points.

Usage

get_usgs_elev(latitude, longitude, units = c("meters", "feet", "m", "ft"))

Arguments

Value

A numeric vector of elevations in the requested units, with one element for each input coordinate pair. If an elevation cannot be retrieved for a point, NA_real_ is returned for that location and a warning is issued.

Examples

## Not run: 
get_usgs_elev(
  latitude = 39.102075,
  longitude = -96.594689
)

get_usgs_elev(
  latitude = c(39.102075, 38.8977),
  longitude = c(-96.594689, -77.0365),
  units = "ft"
)

## End(Not run)

Description

Retrieves current observations from the Iowa Environmental Mesonet (IEM).

Usage

iem_current(
  network = NULL,
  networkclass = NULL,
  wfo = NULL,
  country = NULL,
  state = NULL,
  stations = NULL,
  minutes = NULL
)

Arguments

Details

At least one filter must be supplied. Station identifiers may be shared across networks, so a station-only request can return multiple rows for a single identifier. Use network with stations when you need one network.

Value

A tibble containing current station metadata and observations returned by IEM, with station identifiers in station_id. Units and available variables vary by network.

References

Iowa Environmental Mesonet API: https://mesonet.agron.iastate.edu/api/

IEM API v1 documentation: https://mesonet.agron.iastate.edu/api/1/docs

Examples

## Not run: 
current <- iem_current(network = "IA_ASOS")
dsm <- iem_current(network = "IA_ASOS", stations = "DSM")

## End(Not run)

Description

Retrieves daily summary observations from the Iowa Environmental Mesonet (IEM).

Usage

iem_daily(network, station = NULL, date = NULL, year = NULL, month = NULL)

Arguments

Details

Use either date for all stations in a network on one local date, or year and optional month for a longer station or network request. Do not supply date together with year or month.

Value

A tibble containing daily summary observations returned by IEM, with station identifiers in station_id when returned. Units and available variables vary by network.

References

Iowa Environmental Mesonet API: https://mesonet.agron.iastate.edu/api/

IEM API v1 documentation: https://mesonet.agron.iastate.edu/api/1/docs

Examples

## Not run: 
daily <- iem_daily("IA_ASOS", station = "DSM", year = 2024)
network_day <- iem_daily("IA_ASOS", date = "2024-06-01")

## End(Not run)

Description

Retrieves the network table from the Iowa Environmental Mesonet (IEM) API.

Usage

iem_networks()

Details

The Iowa Environmental Mesonet groups stations into networks such as IA_ASOS, IA_COOP, and other state, roadway, hydrological, and special observing networks. Use iem_networks() to discover valid network values for other IEM helpers.

Value

A tibble containing IEM network identifiers in network, network names in network_name, time zones, geographic extents, and windrose update timestamps when available.

References

Iowa Environmental Mesonet API: https://mesonet.agron.iastate.edu/api/

IEM API v1 documentation: https://mesonet.agron.iastate.edu/api/1/docs

Examples

## Not run: 
networks <- iem_networks()
subset(networks, id == "IA_ASOS")

## End(Not run)

Description

Retrieves one local calendar day of observations for one IEM station.

Usage

iem_obhistory(station, network, date = Sys.Date(), full = FALSE)

Arguments

Details

The date argument is interpreted by IEM as a local station calendar date. UTC timestamps are parsed as POSIXct values in the UTC time zone. Local timestamp fields are returned as character values because station time zones vary by network.

Value

A tibble containing one day of station observations returned by IEM, with station identifiers in station_id when returned. Units and available variables vary by network.

References

Iowa Environmental Mesonet API: https://mesonet.agron.iastate.edu/api/

IEM API v1 documentation: https://mesonet.agron.iastate.edu/api/1/docs

Examples

## Not run: 
obs <- iem_obhistory("DSM", network = "IA_ASOS", date = "2024-06-01")

## End(Not run)

Description

Retrieves station metadata for one IEM network or one station identifier.

Usage

iem_stations(network)

iem_station(station_id)

Arguments

Details

iem_stations() returns all stations in one network. iem_station() looks up one station identifier across IEM networks, which is useful because some identifiers are shared by more than one network.

Value

A tibble containing station metadata returned by IEM, including station identifiers in station_id, names in station_name, network identifiers, time zones, archive dates, and longitude and latitude when available.

References

Iowa Environmental Mesonet API: https://mesonet.agron.iastate.edu/api/

IEM API v1 documentation: https://mesonet.agron.iastate.edu/api/1/docs

Examples

## Not run: 
stations <- iem_stations("IA_ASOS")
iem_station("DSM")

## End(Not run)

Description

Daily USGS water data for Kings Creek at monitoring location USGS-06879650.

Usage

kings_discharge

Format

A tibble with 716 rows and 5 variables:

monitoring_location_id

USGS monitoring location ID.

time

Date of observation.

value

Observed value. Units depend on parameter_code.

parameter_code

USGS parameter code: 00060 = discharge, 00065 = gage height, 00010 = water temperature.

qualifier

USGS data qualifier.

Details

The dataset includes daily observations for water year 2025, from 2024-10-01 through 2025-09-30.

Source

USGS Water Data API, retrieved with dataRetrieval::read_waterdata_daily().

Description

Retrieves fire weather data in FW13 format for one station and date range.

Usage

ks_meso_fw13(station, start_date, end_date)

Arguments

Details

Kansas Mesonet data are preliminary and subject to revision. Cite the Kansas Mesonet when sharing, publishing, or otherwise disseminating data accessed with this function. A suggested citation format is: Kansas Mesonet, year: webpage title. Accessed date, webpage URL. Review the Kansas Mesonet data usage policy before automated use; automated page scraping or data ingesting without written consent is not permitted.

Value

A character vector containing FW13 records.

References

Kansas Mesonet data usage policy: https://mesonet.k-state.edu/about/usage/

Examples

## Not run: 
ks_meso_fw13(
  station = "Konza Prairie",
  start_date = "2024-04-01",
  end_date = "2024-04-07"
)

## End(Not run)

Description

Retrieves the timestamp of the most recently ingested data for each station for a given observation interval. The returned data includes the "--all--" row reported by Kansas Mesonet.

Usage

ks_meso_most_recent(interval)

Arguments

Details

Kansas Mesonet data are preliminary and subject to revision. Cite the Kansas Mesonet when sharing, publishing, or otherwise disseminating data accessed with this function. A suggested citation format is: Kansas Mesonet, year: webpage title. Accessed date, webpage URL. Review the Kansas Mesonet data usage policy before automated use; automated page scraping or data ingesting without written consent is not permitted.

Value

A tibble with station names in station_name and most recent observation times in timestamp.

References

Kansas Mesonet data usage policy: https://mesonet.k-state.edu/about/usage/

Examples

## Not run: 
ks_meso_most_recent(interval = "hour")

## End(Not run)

Description

Retrieves activity data for Kansas Mesonet stations, including observation intervals and data spans.

Usage

ks_meso_station_activity()

Details

Kansas Mesonet data are preliminary and subject to revision. Cite the Kansas Mesonet when sharing, publishing, or otherwise disseminating data accessed with this function. A suggested citation format is: Kansas Mesonet, year: webpage title. Accessed date, webpage URL. Review the Kansas Mesonet data usage policy before automated use; automated page scraping or data ingesting without written consent is not permitted.

Value

A tibble with station activity details, including station names in station_name and start and end observation times.

References

Kansas Mesonet data usage policy: https://mesonet.k-state.edu/about/usage/

Examples

## Not run: 
activity <- ks_meso_station_activity()
subset(activity, station_name == "Konza Prairie")

## End(Not run)

Description

Fetches metadata about Kansas Mesonet stations, including location and network details.

Usage

ks_meso_stations()

Details

Kansas Mesonet data are preliminary and subject to revision. Cite the Kansas Mesonet when sharing, publishing, or otherwise disseminating data accessed with this function. A suggested citation format is: Kansas Mesonet, year: webpage title. Accessed date, webpage URL. Review the Kansas Mesonet data usage policy before automated use; automated page scraping or data ingesting without written consent is not permitted.

Value

A tibble containing station metadata, including station_name, station_id, network, and network_name.

References

Kansas Mesonet data usage policy: https://mesonet.k-state.edu/about/usage/

Examples

## Not run: 
stations <- ks_meso_stations()
subset(stations, grepl("Konza", station_name))

## End(Not run)

Description

Retrieves weather observations for one or more Kansas Mesonet stations or a supported Kansas Mesonet subnetwork.

Usage

ks_meso_timeseries(
  stations = NULL,
  network = NULL,
  start_date,
  end_date,
  interval,
  vars = NULL
)

Arguments

Details

Large date ranges are split into chunks automatically to stay within the Kansas Mesonet API record limit. Data are returned directly and are not written to a local cache.

Kansas Mesonet data are preliminary and subject to revision. Cite the Kansas Mesonet when sharing, publishing, or otherwise disseminating data accessed with this function. A suggested citation format is: Kansas Mesonet, year: webpage title. Accessed date, webpage URL. Review the Kansas Mesonet data usage policy before automated use; automated page scraping or data ingesting without written consent is not permitted.

Value

A tibble containing requested observations with snake_case column names. Kansas Mesonet timestamps are parsed as POSIXct values in the fixed Mesonet time zone, Etc/GMT+6.

References

Kansas Mesonet data usage policy: https://mesonet.k-state.edu/about/usage/

Examples

## Not run: 
konza <- ks_meso_timeseries(
  stations = "Konza Prairie",
  start_date = "2024-06-01",
  end_date = "2024-06-07",
  interval = "hour",
  vars = c("TEMP2MAVG", "RELHUM2MAVG", "PRESSUREAVG")
)

## End(Not run)

Description

Retrieves variable metadata from the Kansas Mesonet REST variables page and returns a tidy table of available variables, including their CSV headings, original variable names, cleaned variable names, units, and descriptions.

Usage

ks_meso_vars()

Details

The function downloads the Kansas Mesonet variables page, extracts the embedded JavaScript metadata array, parses variable fields, and standardizes variable names into tidy_name. Kansas Mesonet data are preliminary and subject to revision. Cite the Kansas Mesonet when sharing, publishing, or otherwise disseminating data accessed with this function. A suggested citation format is: Kansas Mesonet, year: webpage title. Accessed date, webpage URL. Review the Kansas Mesonet data usage policy before automated use; automated page scraping or data ingesting without written consent is not permitted.

Value

A tibble with one row per Kansas Mesonet variable and the columns:

csv_heading

The variable heading used in Mesonet CSV output.

var

The original variable name from the Mesonet metadata.

tidy_name

A cleaned, snake_case version of var.

units

The measurement units for the variable.

desc

A description of the variable.

References

Kansas Mesonet data usage policy: https://mesonet.k-state.edu/about/usage/

Examples

## Not run: 
vars <- ks_meso_vars()
vars

## End(Not run)

Description

Returns a bounding box vector suitable for the bbox argument of ncei_stations() and get_noaa_stations().

Usage

ncei_bbox(latitude, longitude, dist_km)

Arguments

Value

A numeric vector c(north, west, south, east).

Examples

# Bounding box 50 km around Konza Prairie
ncei_bbox(39.1, -96.6, 50)

Description

Retrieves weather and climate data from NOAA's National Centers for Environmental Information (NCEI) using the Access Data Service API.

Usage

ncei_data(
  dataset,
  stations,
  start_date,
  end_date,
  data_types = NULL,
  units = "metric",
  include_station_name = TRUE,
  include_station_location = FALSE
)

Arguments

Details

This function calls ⁠https://www.ncei.noaa.gov/access/services/data/v1⁠. Data are returned in CSV format and parsed into a tibble.

For dataset = "global-hourly" (Integrated Surface Database), the mandatory packed fields are expanded into typed numeric columns with SI units and missing-value sentinels converted to NA:

WND

wind_direction (degrees), wind_direction_quality, wind_type_code, wind_speed (m/s), wind_speed_quality.

CIG

ceiling_height (m), ceiling_quality, ceiling_determination_code, ceiling_cavok.

VIS

visibility (m), visibility_quality, visibility_variability_code, visibility_variability_quality.

TMP

temperature (°C), temperature_quality.

DEW

dew_point_temperature (°C), dew_point_quality.

SLP

sea_level_pressure (hPa), sea_level_pressure_quality.

AA1–AA4

precipitation_period_hours (hr), precipitation (mm), precipitation_condition_code, precipitation_quality.

Value

A tibble with one row per observation and snake_case column names. Leading columns (when present) are station_id, station_name, latitude, longitude, elevation, and either datetime (POSIXct UTC, for sub-daily datasets) or date (Date, for daily and coarser datasets). Remaining columns depend on the requested dataset and data_types. Columns that are entirely NA are dropped.

See Also

ncei_stations() to search for station identifiers, ncei_datasets() to list available datasets.

Examples

## Not run: 
# Daily temperature and precipitation at a single station
ncei_data(
  dataset = "daily-summaries",
  stations = "USW00023183",
  start_date = "2023-01-01",
  end_date = "2023-12-31",
  data_types = c("TMAX", "TMIN", "PRCP")
)

# Hourly ISD observations with expanded mandatory fields
ncei_data(
  dataset = "global-hourly",
  stations = "72469023183",
  start_date = "2023-06-01",
  end_date = "2023-06-30"
)

## End(Not run)

Description

Retrieves metadata about a dataset from the NCEI Support Service API, including available data types, spatial coverage, and temporal range.

Usage

ncei_datasets(dataset)

Arguments

Value

A list of dataset metadata as returned by the Support Service API. The structure varies by dataset but typically includes fields such as id, name, dataTypes, and extent.

Examples

## Not run: 
ncei_datasets("daily-summaries")
ncei_datasets("global-hourly")

## End(Not run)

Description

Searches for stations in NOAA's National Centers for Environmental Information (NCEI) using the Common Access Search Service API.

Usage

ncei_stations(
  dataset,
  bbox = NULL,
  start_date = NULL,
  end_date = NULL,
  data_types = NULL,
  text = NULL,
  limit = 100L,
  offset = 0L
)

Arguments

Details

This function calls ⁠https://www.ncei.noaa.gov/access/services/search/v1/data⁠.

To find stations near a specific point, compute a bounding box with ncei_bbox() and pass it to bbox. For site-level station searches prefer closest_noaa_stations(), which computes the bounding box automatically and filters by geodesic distance.

Value

A tibble with one row per station and the following columns:

station_id

Station identifier (dataset prefix stripped, e.g., "USW00023183" rather than "GHCND:USW00023183").

station_name

Station name.

latitude,longitude

Decimal-degree coordinates.

start_date,end_date

Period of record as Date objects.

See Also

closest_noaa_stations(), get_noaa_stations(), ncei_bbox(), ncei_data()

Examples

## Not run: 
# All daily-summaries stations in a region
ncei_stations(
  dataset = "daily-summaries",
  bbox = c(40, -100, 38, -98)
)

# Hourly stations with temperature data and a long record
ncei_stations(
  dataset = "global-hourly",
  start_date = "1990-01-01",
  end_date = Sys.Date()
)

## End(Not run)

Description

Converts water-vapor-corrected CO2 partial pressure, pCO2, to CO2 mole fraction, xCO2.

Usage

pCO2_to_xCO2(temp_water, pCO2_uatm, atmo_press, press_units, ...)

Arguments

Value

Numeric vector of CO2 mole fraction in parts per million.

References

Dickson, A.G., Sabine, C.L., and Christian, J.R. (Eds.) (2007). Guide to best practices for ocean CO2 measurements. PICES Special Publication 3.

Examples

pCO2_to_xCO2(
  temp_water = 20,
  pCO2_uatm = 400,
  atmo_press = 101.325,
  press_units = "kPa",
  salinity = 0,
  method = "MIMSY"
)

Description

Calculates exceedance probabilities using the same Weibull plotting position method and return shape as calc_exceedance_prob(), but delegates ranking to a C++ implementation.

Usage

rcpp_calc_exceedance_prob(flow, rm.zero = FALSE)

Arguments

Value

A numeric vector of exceedance probabilities. If rm.zero = TRUE, the returned vector has the same length as the input with NA at positions of zero or negative values.

See Also

calc_exceedance_prob()

Examples

rcpp_calc_exceedance_prob(c(10, 5, 0, 15, 8, NA, 0, 20))

Description

Reads a shapefile or shapefile contained in a zip archive, automatically handling path specifications and layer detection. This is a convenience wrapper around sf::st_read() that simplifies reading common shapefile formats.

Usage

read_shp(path, layer = NULL)

Arguments

Details

The function handles several input types:

• Direct paths to .shp files (automatically extracts directory and layer name)

• Directories containing shapefile components (auto-detects layer)

• Zip files containing shapefiles (uses GDAL's virtual file system)

When reading from zip files, the function uses GDAL's ⁠/vsizip/⁠ virtual file system prefix.

Value

An sf object containing the spatial data from the shapefile.

See Also

sf::st_read() for the underlying reading function, sf::st_layers() for layer detection

Examples

## Not run: 
# Read from .shp file path
shp_data <- read_shp("path/to/file.shp")

# Read from directory containing shapefile components
shp_data <- read_shp("path/to/shapefile_directory")

# Read from zip file
shp_data <- read_shp("path/to/archive.zip")

# Specify layer explicitly
shp_data <- read_shp("path/to/multi_layer.zip", layer = "specific_layer")

## End(Not run)

Description

Retrieves the most recent observation from each TWDB TexMesonet station.

Usage

tex_meso_current()

Details

Current data are near-real-time observations. TexMesonet reports values in the units returned by the API, available with attr(x, "units").

Value

A tibble containing the most recent station observations, including station_id, station_name, and UTC recorded_time. The API returns availability by station, so some measurement columns may contain missing values. The returned tibble has a "units" attribute containing units reported by the API.

References

TexMesonet APIs: https://www.texmesonet.org/Apis

Examples

## Not run: 
current <- tex_meso_current()
attr(current, "units")

## End(Not run)

Description

Retrieves name, location, and status metadata for Texas Water Development Board (TWDB) stations from the TexMesonet API.

Usage

tex_meso_stations(active = NULL, displayed = NULL)

Arguments

Details

TexMesonet is managed by the Texas Water Development Board. Its public API provides near-real-time data for TWDB weather and soil observing stations. Review the TexMesonet disclaimer before automated use.

Value

A tibble containing station metadata returned by TexMesonet, including station_id, station_name, display ID, state, county, latitude, longitude, elevation in feet, active status, and online date.

References

TexMesonet APIs: https://www.texmesonet.org/Apis

TexMesonet disclaimer: https://www.texmesonet.org/About

Examples

## Not run: 
stations <- tex_meso_stations(active = TRUE)
subset(stations, county == "Blanco")

## End(Not run)

Description

Retrieves recent time-series observations for a single TWDB TexMesonet station.

Usage

tex_meso_timeseries(
  site_id,
  prior_minutes,
  variable = c("all", "temperature", "humidity", "barometric_pressure", "precip",
    "wind_speed")
)

Arguments

Details

TexMesonet's public time-series API retrieves recent observations by station and look-back window. The API may return different fields by station because not all stations measure every parameter.

Value

A tibble of observations with UTC date_time values. Single-variable requests return value and date_time columns and have "field_name", "station_name", "station_id", and "units" attributes. Requests with variable = "all" return one column per charting field and have "station_name" and "station_id" attributes.

References

TexMesonet APIs: https://www.texmesonet.org/Apis

Examples

## Not run: 
tex_meso_timeseries(2, prior_minutes = 60)
tex_meso_timeseries(2, prior_minutes = 60, variable = "temperature")

## End(Not run)

Description

Converts CO2 mole fraction, xCO2, to the water-vapor-corrected partial pressure, pCO2.

Usage

xCO2_to_pCO2(xCO2_ppm, temp_water, atmo_press, press_units, ...)

Arguments

Details

The conversion uses:

$pCO2 = (P_{atm} - P_{H2O}) \cdot xCO2$

where atmospheric pressure and water vapor pressure are in atm and xCO2 is supplied in parts per million.

Value

Numeric vector of partial pressure of CO2 in microatmospheres.

References

Dickson, A.G., Sabine, C.L., and Christian, J.R. (Eds.) (2007). Guide to best practices for ocean CO2 measurements. PICES Special Publication 3.

Examples

xCO2_to_pCO2(
  xCO2_ppm = 420,
  temp_water = 20,
  atmo_press = 101.325,
  press_units = "kPa",
  salinity = 0,
  method = "MIMSY"
)