Data Access Form

Dataset Title:	CPC 1/2x1/2 land mask, 0.5°, 1980
Institution:	NOAA/ESRL PSD (Dataset ID: noaa_psl_83be_57b2_f690)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	1	(just one value)

latitude (degrees_north)	360	-0.5 (even)

longitude (degrees_east)	720	0.5 (even)

Grid Variables (which always also download all of the dimension variables)

land (Land-sea Mask)

File type: (more information)

(Documentation / Bypass this form)

(Please be patient. It may take a while to get the data.)

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 3.155328e+8, 3.155328e+8;
    String axis "T";
    String coordinate_defines "point";
    String delta_t "0000-00-00 06:00:00";
    String ioos_category "Time";
    String long_name "Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.75, 89.75;
    String axis "Y";
    String coordinate_defines "point";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range 0.25, 359.75;
    String axis "X";
    String coordinate_defines "point";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  land {
    Int16 _FillValue -32767;
    Int16 actual_range -1, 0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -1.5;
    Int16 GRIB_id 172;
    String GRIB_name "LSM";
    String ioos_category "Identifier";
    String level_desc "Surface";
    String long_name "Land-sea Mask";
    Int16 missing_value 32766;
    String parent_stat "Other";
    Int16 precision 0;
    String standard_name "land_binary_mask";
    String statistic "Individual Obs";
    Float32 valid_range -1.0, 0.0;
    String var_desc "Land-sea Mask";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String comment "Data file is obtained from CPC";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "esrl.psd.data@noaa.gov";
    String creator_name "NOAA/ESRL PSD";
    String creator_type "institution";
    String creator_url "https://www.esrl.noaa.gov/psd/";
    String dataset_title "CPC Soil Moisture";
    Float64 Easternmost_Easting 359.75;
    Float64 geospatial_lat_max 89.75;
    Float64 geospatial_lat_min -89.75;
    Float64 geospatial_lat_resolution 0.5;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.75;
    Float64 geospatial_lon_min 0.25;
    Float64 geospatial_lon_resolution 0.5;
    String geospatial_lon_units "degrees_east";
    String history 
"created 2004/10 by CAS (netCDF2.3)
2025-04-15T21:08:03Z https://psl.noaa.gov/thredds/dodsC/Datasets/cpcsoil/landmask.nc
2025-04-15T21:08:03Z http://upwell.pfeg.noaa.gov/erddap/griddap/noaa_psl_83be_57b2_f690.das";
    String id "Datasets/cpcsoil/landmask.nc";
    String infoUrl "https://www.psl.noaa.gov/data/gridded/data.cpcsoil.html";
    String institution "NOAA/ESRL PSD";
    String keywords "2x1, binary, center, climate, cpc, data, division, earth, esrl, identifier, laboratory, land, land-sea, land_binary_mask, latitude, longitude, mask, noaa, physical, prediction, psd, research, sciences, sea, system, time";
    String license 
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
    Float64 Northernmost_Northing 89.75;
    String references "https://www.psl.noaa.gov/data/gridded/data.cpcsoil.html";
    String source "https://www.cpc.ncep.noaa.gov/products/Soilmst_Monitoring/US/Soilmst/Soilmst.shtml";
    String sourceUrl "https://psl.noaa.gov/thredds/dodsC/Datasets/cpcsoil/landmask.nc";
    Float64 Southernmost_Northing -89.75;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Data file is obtained from Climate Prediction Center (CPC)";
    String time_coverage_end "1980-01-01T00:00:00Z";
    String time_coverage_start "1980-01-01T00:00:00Z";
    String title "CPC 1/2x1/2 land mask, 0.5°, 1980";
    Float64 Westernmost_Easting 0.25;
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request a data subset, graph, or map from a gridded dataset (for example, sea surface temperature data from a satellite), via a specially formed URL. griddap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its projection constraints (external link)

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

(easy) You can get data by using the dataset's Data Access Form. It makes the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

griddap request URLs must be in the form
https://upwell.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://upwell.pfeg.noaa.gov/erddap/griddap/jplMURSST41.htmlTable?analysed_sst[(2002-06-01T09:00:00Z)][(-89.99):1000:(89.99)][(-179.99):1000:(180.0)]
Thus, the query is often a data variable name (e.g., analysed_sst), followed by [(start):stride:(stop)] (or a shorter variation of that) for each of the variable's dimensions (for example, [time][latitude][longitude]).

For details, see the griddap Documentation.