stations

datasets

Download, clean, reformat and create new variables from the
USA National Climatic Data Center (NCDC) Global Surface Summary of the Day
(GSOD) weather stations data,
<https://data.noaa.gov/dataset/global-surface-summary-of-the-day-gsod>.
The function, get_GSOD(), retrieves data from the GSOD ftp site and
reformats it from United States Customary System (USCS) units to
International System of Units (SI). 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.
Stations with missing latitude or longitude or values for both of 0 are
omitted. 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 vapor
pressure, 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 or
individual stations if the station ID is known. 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
<http://spatial-analyst.net/book/system/files/getGSOD.R> with enhancements
to be cross-platform, faster and more flexible. For information on the
original data from NCDC, please see the GSOD readme.txt file available from,
<http://www1.ncdc.noaa.gov/pub/data/gsod/readme.txt>.

Adam Sparks

GSODR

Download, Clean and Generate New Variables from GSOD Data

stations function

A data frame with 24878 observations of 13 variables:
<dl>
  <dt>USAF</dt><dd>Air Force Datsav3 station number</dd> <dt>WBAN</dt><dd>Weather Bureau Army Navy (5 digit identifier)</dd> <dt>STN.NAME</dt><dd>Unique station name</dd> <dt>CTRY</dt><dd>FIPS country ID</dd> <dt>STATE</dt><dd>If applicable, US states only (2 letter code)</dd> <dt>CALL</dt><dd>ICAO Identifier, identifiers approved for use under the
  International Civil Aviation Administration plan of identifiers
  (4 letter identifier)</dd> <dt>LAT</dt><dd>Latitude in thousandths of decimal degrees</dd> <dt>LON</dt><dd>Longitude in thousandths of decimal degrees</dd> <dt>ELEV.M</dt><dd>Elevation to tenths in metres</dd> <dt>BEGIN</dt><dd>First available date of data for station, YYYYMMDD format</dd> <dt>END</dt><dd>Last available date of data for station, YYYYMMDD format</dd> <dt>STNID</dt><dd>Unique station ID, a concatenation of USAF and WBAN number,
  used for merging with station data weather files</dd> <dt>ELEV.M.SRTM.90m</dt><dd>Elevation in metres extracted from SRTM data (Jarvis
  <em>et al.</em> 2008)</dd> </dl> Station information for the US National Climatic Data Centre (NCDC)
Global Surface Summary of the Day (GSOD) weather data. The original file has
missing and incorrect information. This is a clean version of this dataset,
provided by this package. The following changes were made.
<ol>
<li>Stations with both a latitude and longitude of 0 degrees were removed.
</li>
<li>Stations with longitude values that are beyond -180/180 degrees were
removed.
</li>
<li>Stations with latitude values that are beyond -90/90 degrees were
removed.
</li>
<li>For convenience elevation is converted from decimetres to metres.
</li>
<li>STNID is added as a new field, a concatenation of USAF and WBAN.
</li>
<li>A new field for elevation is included, ELEV.M.90m. This was created
using mean values of a 200m buffer around the reported LAT/LON station
location within the CGIAR-CSI hole-filled 90m SRTM digital elevation model
(Jarvis <em>et al</em>. 2008)
</li>
</ol>

Format

<a href="/link/ftp%3A%2F%2Fftp.ncdc.noaa.gov%2Fpub%2Fdata%2Fnoaa%2Fisd-history.csv?package=GSODR&version=0.1.9" data-mini-rdoc="GSODR::ftp://ftp.ncdc.noaa.gov/pub/data/noaa/isd-history.csv">ftp://ftp.ncdc.noaa.gov/pub/data/noaa/isd-history.csv</a>

Source

<a href = 'ftp://ftp.ncdc.noaa.gov/pub/data/noaa/isd-history.csv'>ftp://ftp.ncdc.noaa.gov/pub/data/noaa/isd-history.csv</a>

stations: Stations

Description

Usage

Arguments

Format

Source

References