read.WSdata: Prepares weather station data

In midraed/water: Actual Evapotranspiration with Energy Balance Models

Description

Prepares weather station data

Usage

read.WSdata(
  WSdata,
  ...,
  height = 2.2,
  lat,
  long,
  elev,
  columns = c(date = 1, time = 2, radiation = 3, wind = 4, RH = 6, temp = 7, rain = 8),
  date.format = "%Y-%m-%d",
  time.format = "%H:%M:%S",
  datetime.format = "%Y-%m-%d %H:%M:%S",
  tz = "",
  cf = c(1, 1, 1),
  MTL
)

Arguments

WSdata	csv file with weather station data or data.frame
...	additional parameter to pass to read.csv()
height	weather station sensors height in meters
lat	latitude of weather station in decimal degrees. Negative values for south latitude
long	longitude of weather station in decimal degrees. Negative values for west longitude
elev	elevation of weather station in meters
columns	vector with the column numbers in WSdata for the date, time, radiation, wind, RH, temperature and rain. If date and time are in the same column, the column number has to be the same. Names in this vector are ignored and are presented on Usage and examples only as a reference.
date.format	date format. See strptime format argument.
time.format	time format. See strptime format argument.
datetime.format	datetime format. See strptime format argument.
tz	timezone of the weather station dates. If not present assumes the same timezone as the computer running the code. See strptime for details.
cf	conversion factor to convert radiation, wind, and temperature to W/m2; m/s and Celsius. See Details.
MTL	Metadata file. If not provided will look for one on working directory. If provided or present will calculate weather conditions on satellite overpass.

Details

For cf, if your data is in W/m2, km/h and Celsius (radiation, wind, temperature), cf should be: cf = c(1,0.2777778,1)

Value

waterWeatherStation object, with data.frames with all data, hourly data and conditions at satellite flyby.

Author(s)

Guillermo Federico Olmedo

References

Landsat 7 Metadata example file available from the U.S. Geological Survey. Weather Station example file courtesy of CITRA, Universidad de Talca, Chile

See Also

read.WSdata2 for the equivalent using read.csv2()

Other Weather station related functions: plot.waterWeatherStation(), print.waterWeatherStation(), read.WSdata2()

Examples

csvfile <- system.file("extdata", "apples.csv", package="water")
MTLfile <- system.file("extdata", "L7.MTL.txt", package="water")
WS <- read.WSdata(WSdata = csvfile, date.format = "%d/%m/%Y", 
                  lat=-35.42222, long= -71.38639, elev=201, height= 2.2,
                  columns=c("date" = 1, "time" = 2, "radiation" = 3,
                  "wind" = 4, "RH" = 6, "temp" = 7, "rain" = 8), 
                  MTL = MTLfile, tz = "America/Santiago")
print(WS)
plot(WS, alldata=FALSE)
plot(WS, alldata=TRUE)

midraed/water documentation built on Feb. 20, 2022, 7:30 a.m.