nearest_stations

Latitude expressed as decimal degrees (DD) [WGS84]

Longitude expressed as decimal degrees (DD) [WGS84]

Distance in kilometres from point for which stations are to
be returned.

distance


Given a latitude and longitude value entered as decimal degrees (DD),
this function returns a list of STNID values, which can be used in the
<code>get_GSOD</code> function to query for specific stations as an argument in the
<code>station</code> parameter of that function.


Provides automated downloading, parsing, cleaning, unit conversion
and formatting of Global Surface Summary of the Day (GSOD) weather data from
the from the USA National Climatic Data Center (NCDC) for use in R. All
units are converted from from United States Customary System (USCS) units to
International System of Units (SI). Stations may be individually checked for
number of missing days defined by the user, where stations with too many
missing observations are omitted. Only stations with valid reported latitude
and longitude values are permitted in the final data. Additional useful
variables, saturation vapour pressure (es), actual vapour pressure (ea) and
relative humidity are calculated from the original data and included in the
final data set. The resulting data include station identification
information, state, country, latitude, longitude, elevation, weather
observations and associated flags. Data may be automatically saved to disk.
File output may be returned as a comma-separated values (CSV) or GeoPackage
(GPKG) file. Additional data are included with this R package: a list of
elevation values for stations between -60 and 60 degrees latitude derived
from the Shuttle Radar Topography Measuring Mission (SRTM). For information
on the GSOD data from NCDC, please see the  GSOD readme.txt file available
from, <http://www1.ncdc.noaa.gov/pub/data/gsod/readme.txt>.

nearest_stations: Find Nearest GSOD Stations to Specified Latitude and Longitude

Description

Usage

Arguments

Value

Examples