Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
NAME
m.cdo.download - Downloads data from NCEI's Climate Data Online (CDO) using their v2 API.
KEYWORDS
NOAA,
NCEI,
Climate Data Online,
CDO
SYNOPSIS
m.cdo.download
m.cdo.download --help
m.cdo.download [-cju] fetch=string [datasetid=string[,string,...]] [datacategoryid=string[,string,...]] [datatypeid=string[,string,...]] [locationcategoryid=string[,string,...]] [locationid=string[,string,...]] [stationid=string[,string,...]] [startdate=string] [enddate=string] [extent=east,north[,east,north,...]] [units=string] [includemetadata=string] [sortfield=string] [sortorder=string] [limit=integer] [offset=integer] [fields=string[,string,...]] [separator=character] [indent=integer] [output=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -c
- Do not include column names in output
- -j
- Print output in JSON
- -u
- Print the request URL and exit
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- fetch=string [required]
- Fetch available metadata or actual data for this specific item
- Options: datasets, datacategories, datatypes, locationcategories, locations, stations, data
- Default: data
- datasetid=string[,string,...]
- Dataset ID
- datacategoryid=string[,string,...]
- Data category ID
- datatypeid=string[,string,...]
- Data type ID
- locationcategoryid=string[,string,...]
- Location category ID
- locationid=string[,string,...]
- Location ID
- stationid=string[,string,...]
- Station ID
- startdate=string
- Start date in YYYY-MM-DD or date time in YYYY-MM-DDThh:mm:ss (for data only)
- enddate=string
- End date in YYYY-MM-DD or date time in YYYY-MM-DDThh:mm:ss (for data only)
- extent=east,north[,east,north,...]
- Extent in lower-left and upper-right coordinates in degrees
- units=string
- Units for data (raw for no conversion)
- Options: raw, standard, metric
- Default: metric
- includemetadata=string
- Include metadata when actually fetching data (slower)
- Options: true, false
- Default: false
- sortfield=string
- Sort field
- Options: id, name, mindate, maxdate, datacoverage
- sortorder=string
- Sort order
- Options: asc, desc
- Default: asc
- limit=integer
- Max number of results (0 for unlimited; can be > 1000)
- Default: 0
- offset=integer
- 1-based offset for the first result
- Default: 1
- fields=string[,string,...]
- Fields to print
- separator=character
- Field separator
- Special characters: pipe, comma, space, tab, newline
- Default: pipe
- indent=integer
- Indent for JSON format (-1 for single line per record)
- Default: 2
- output=name
- Name for output file
m.cdo.download downloads data from
NCEI's Climate Data
Online (CDO) using their v2 API.
This module uses
the CDO
Web Services v2 API to download CDO data.
To access the API services, obtain CDO API tokens from
here and define an
environment variable CDO_API_TOKENS. Use commas to separate multiple
tokens. For example, two tokens can be stored as follows:
export CDO_API_TOKENS=aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
List available datasets:
m.cdo.download fetch=datasets
List available dataset IDs without column names:
m.cdo.download -c fetch=datasets fields=id
List available stations within (47.5204,-122.2047)-(47.6139,-122.1065):
m.cdo.download fetch=stations extent=47.5204,-122.2047,47.6139,-122.1065
List available "precipitation" and "average temperature"
data types:
m.cdo.download fetch=datatypes field=id,mindate,maxdate,name |
grep -i "|precipitation\||average temperature"
List 10 available stations with PRCP and TAVG data starting 2023-01-01:
m.cdo.download fetch=stations datatypeid=PRCP,TAVG startdate=2023-01-01 limit=10
Fetch daily PRCP and TAVG data for a station with mindate ≤ 2023-01-01 and
save it into a file:
# find dataset IDs for data types PRCP and TAVG; let's use GHCND (Daily Summary)
m.cdo.download fetch=datasets datatypeid=PRCP,TAVG
# find the first station ID with mindate ≤ 2023-01-01
stationid=$(m.cdo.download -c fetch=stations datatypeid=PRCP,TAVG \
startdate=2023-01-01 fields=id limit=1)
# fetch actual data and save it to data.txt
m.cdo.download fetch=data datasetid=GHCND datatypeid=PRCP,TAVG \
stationid=$stationid startdate=2023-01-01 enddate=2023-10-15 \
output=data.txt
Create a point vector map with all stations:
# from a latlong location
# download metadata for all stations
m.cdo.download stations output=cdo_stations.txt
# import cdo_stations.txt
xy=$(awk -F'|' '{
if (NR == 1) {
for (i = 1; i <= NF; i++)
if ($i == "latitude")
latind = i
else if ($i == "longitude")
lonind = i
printf "x=%s y=%s", lonind, latind
exit
}
}' cdo_stations.txt)
v.in.ascii input=cdo_stations.txt output=cdo_stations skip=1 $xy
# rename columns
old_cols=$(db.columns table=cdo_stations exclude=cat)
new_cols=$(head -1 cdo_stations.txt | sed 's/|/ /g')
for old_new in $(echo $old_cols $new_cols |
awk '{
n = NF / 2
for (i = 1; i <= n; i++)
printf "%s,%s\n", $i, $(i + n)
}'); do
v.db.renamecolumn map=cdo_stations column=$old_new
done
m.tnm.download
Huidae Cho, New Mexico State University
SOURCE CODE
Available at:
m.cdo.download source code
(history)
Latest change: Saturday Oct 21 23:02:07 2023 in commit: 31ae1cfa675745f06d887625deec87700bded733
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GRASS Development Team,
GRASS GIS 8.3.3dev Reference Manual