GSODR (0.1.4)

Download, Clean and Generate New Variables from GSOD Data.

http://cran.r-project.org/web/packages/GSODR

Download, clean and reformat weather data from USA National Climatic Data Center (NCDC) Global Surface Summary of the Day (GSOD) weather stations, . The function, get_GSOD(), retrieves data from the GSOD ftp site and reformats it from United States Customary System (USCS) units to metric units, also for convenience elevation is converted from decimetres to metres. Stations are individually checked for number of missing days, as defined by the user, to assure data quality. Stations with too many missing observations are omitted from final file. Also omitted are stations with a latitude of < -90 or > 90 or longitude of < - 180 or > 180. Output is returned as a comma-separated values (CSV) file written to disk in a location selected by the user, which summarises each year by station and includes new variables: actual and saturation vapor pressure and relative humidity calculated from the original GSOD data. The resulting files can be as large as 500mb depending on the user's stringency for missing data and geographic area of interest. Be sure to have sufficient RAM and disk space as well as a reasonably fast internet connection to use this package to perform this operation. However, for much smaller and more manageable data sets, an individual country of interest may be selected as well as only stations falling between -60/60 degrees latitude for agroclimatology work. The resulting files include station data (e.g., station name, country, latitude, longitude, elevation) for use in a geographic information system (GIS). The function was largely based on T. Hengl's 'getGSOD.R' script, available from with enhancements to be more cross-platform, faster and more flexible. Currently flags are maintained for all of the columns except for MIN/MAX. In the original MIN/MAX columns of the GSOD data, "blank indicates max temp was taken from the explicit max temp report and not from the 'hourly' data. * indicates max temp was derived from the hourly data (i.e., highest hourly or synoptic-reported temperature).", GSOD readme.txt . For CSV files resulting from GSODR the flags are stripped.

Maintainer: Adam Sparks
Author(s): Adam Sparks [aut, cre], Tomislav Hengl [ctb], Andy Nelson [ctb], Kay Sumfleth [ctb]

License: GPL (>= 3)

Uses: countrycode, curl, data.table, dplyr, lubridate, raster, readr, stringr, tidyr

Released over 1 year ago.