ERDDAP > griddap > Data Access Form

Dataset Title:	Sea Surface Salinity, SMAP, Near Real-Time, Global 0.25°, 2015-present, Daily
Institution:	NOAA NESDIS CoastWatch   (Dataset ID: noaacwSMAPsssDaily)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Files | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (Centered Time, UTC)				3071	1 day 1h 48m 49s (uneven)
altitude (m)				1	(just one value)
latitude (degrees_north)				720	0.25 (even)
longitude (degrees_east)				1440	0.25 (even)

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

sss (SMAP Sea Surface Salinity, PSU)

sss_dif (SMAP Sea Surface Salinity minus World Ocean Atlas Value, PSU)

ssw (SMAP Wind Speed, m/sec)

l2_time (Time from L2 files, seconds since 1970-01-01T00:00:00Z)

l2_lat (Latitude from L2 files, degrees_north)

l2_lon (Longitude from L2 files, degrees_north)

File type: (more information) .asc - View OPeNDAP-style ISO-8859-1 comma-separated text. .csv - Download a ISO-8859-1 comma-separated text table (line 1: names; line 2: units; ISO 8601 times). .csvp - Download a ISO-8859-1 .csv file with line 1: name (units). Times are ISO 8601 strings. .csv0 - Download a ISO-8859-1 .csv file without column names or units. Times are ISO 8601 strings. .das - View the dataset's metadata via an ISO-8859-1 OPeNDAP Dataset Attribute Structure (DAS). .dds - View the dataset's structure via an ISO-8859-1 OPeNDAP Dataset Descriptor Structure (DDS). .dods - OPeNDAP clients use this to download the data in the DODS binary format. .esriAscii - Download an ISO-8859-1 ESRI ASCII file (latitude longitude data only; longitude must be all below or all above 180). .fgdc - View the dataset's UTF-8 FGDC .xml metadata. .graph - View a Make A Graph web page. .help - View a web page with a description of griddap. .html - View an OPeNDAP-style HTML Data Access Form. .htmlTable - View a UTF-8 .html web page with the data in a table. Times are ISO 8601 strings. .iso19115 - View the dataset's ISO 19115-2/19139 UTF-8 .xml metadata. .itx - Download an ISO-8859-1 Igor Text File. Each axis variable and each data variable becomes a wave. .json - View a table-like UTF-8 JSON file (missing value = 'null'; times are ISO 8601 strings). .jsonlCSV1 - View a UTF-8 JSON Lines CSV file with column names on line 1 (mv = 'null'; times are ISO 8601 strings). .jsonlCSV - View a UTF-8 JSON Lines CSV file without column names (mv = 'null'; times are ISO 8601 strings). .jsonlKVP - View a UTF-8 JSON Lines file with Key:Value pairs (missing value = 'null'; times are ISO 8601 strings). .mat - Download a MATLAB binary file. .nc - Download a NetCDF-3 binary file with COARDS/CF/ACDD metadata. .ncHeader - View the UTF-8 header (the metadata) for the NetCDF-3 .nc file. .ncml - View the dataset's structure and metadata as a UTF-8 NCML .xml file. .nccsv - Download a NetCDF-3-like 7-bit ASCII NCCSV .csv file with COARDS/CF/ACDD metadata. .nccsvMetadata - View the dataset's metadata as the top half of a 7-bit ASCII NCCSV .csv file. .ncoJson - Download a UTF-8 NCO lvl=2 JSON file with COARDS/CF/ACDD metadata. .odvTxt - Download time,latitude,longitude,otherVariables as an ODV Generic Spreadsheet File (.txt). .timeGaps - View a UTF-8 list of gaps in the time values which are larger than the median gap. .tsv - Download a ISO-8859-1 tab-separated text table (line 1: names; line 2: units; ISO 8601 times). .tsvp - Download a ISO-8859-1 .tsv file with line 1: name (units). Times are ISO 8601 strings. .tsv0 - Download a ISO-8859-1 .tsv file without column names or units. Times are ISO 8601 strings. .wav - Download a .wav audio file. All columns must be numeric and of the same type. .xhtml - View a UTF-8 XHTML (XML) file with the data in a table. Times are ISO 8601 strings. .geotif - View a grayscale GeoTIFF .tif file (for latitude longitude data; longitude must be all below or all above 180). .kml - View a Google Earth .kml file (for latitude, longitude data only). .smallPdf - View a small .pdf image file with a graph or map. .pdf - View a standard, medium-sized .pdf image file with a graph or map. .largePdf - View a large .pdf image file with a graph or map. .smallPng - View a small .png image file with a graph or map. .png - View a standard, medium-sized .png image file with a graph or map. .largePng - View a large .png image file with a graph or map. .transparentPng - View a .png image file (just the data, without axes, landmask, or legend).

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.4278896e+9, 1.7131824e+9;
    String axis "T";
    String calendar "gregorian";
    String coverage_content_type "coordinate";
    String ioos_category "Time";
    String long_name "Centered Time";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 actual_range -89.875, 89.875;
    String axis "Y";
    String comment "Latitude values are the centers of the grid cells";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float32 valid_max 90.0;
    Float32 valid_min -90.0;
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float32 actual_range -179.875, 179.875;
    String axis "X";
    String comment "Longitude values are the centers of the grid cells";
    String coverage_content_type "coordinate";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 180.0;
    Float32 valid_min -180.0;
  }
  sss {
    Float32 _FillValue NaN;
    String C_format "%.4g";
    String cell_methods "time: point";
    Float64 colorBarMaximum 37.0;
    Float64 colorBarMinimum 32.0;
    String coverage_content_type "physicalMeasurement";
    String grid_mapping "coord_ref";
    String ioos_category "Salinity";
    String long_name "SMAP Sea Surface Salinity";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  sss_dif {
    Float32 _FillValue NaN;
    String C_format "%.4g";
    String cell_methods "time: point";
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum -5.0;
    String comment "SMAP Sea Surface Salinity minus World Ocean Atlas Monthly Analyzed Sea Surface Salinity, generated for QA and validation";
    String coverage_content_type "qualitifyInformation";
    String ioos_category "Salinity";
    String long_name "SMAP Sea Surface Salinity minus World Ocean Atlas Value";
    String standard_name "sea_water_practical_salinity";
    String units "PSU";
  }
  ssw {
    Float32 _FillValue NaN;
    String C_format "%.4g";
    Float64 colorBarMaximum 15.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Wind";
    String long_name "SMAP Wind Speed";
    String standard_name "wind_speed";
    String units "m/sec";
  }
  l2_time {
    String comment "Time values are the middle of L2 files time coverage (start_time+end_time)/2";
    String ioos_category "Time";
    String long_name "Time from L2 files";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  l2_lat {
    Float32 _FillValue NaN;
    String C_format "%.4g";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "Latitude from L2 files";
    String standard_name "latitude";
    String units "degrees_north";
  }
  l2_lon {
    Float32 _FillValue NaN;
    String C_format "%.4g";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String ioos_category "Location";
    String long_name "Longitude from L2 files";
    String standard_name "longitude";
    String units "degrees_north";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.7.4,hdf5=1.8.13,";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, ACDD-1.3, COARDS";
    String creator_email "coastwatch.info@noaa.gov";
    String creator_name "NOAA CoastWatch";
    String creator_type "institution";
    String creator_url "https://coastwatch.noaa.gov";
    Float64 Easternmost_Easting 179.875;
    Float64 geospatial_lat_max 89.875;
    Float64 geospatial_lat_min -89.875;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.875;
    Float64 geospatial_lon_min -179.875;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "up";
    String geospatial_vertical_units "m";
    String history 
"Tue Apr 16 19:30:04 2024
: /data/socd5/sss/development/hgu/4sqm/bin/../bin/l3smap_gen -n -v -l -a 2 -w /data/socd5/sss/development/hgu/4sqm/NODC_salinity/WOA13/woa13_decav_s04_04v2.nc -V V5.0_NRT /data/socd5/sss/development/hgu/4sqm/bin/../config/.Config_SMAP.input /data/dmz/pub0040/coastwatch/smap/nc/SP_D2024106_Map_SATSSS_data_1day.nc 2
2024-04-19T13:02:46Z (local files)
2024-04-19T13:02:46Z https://coastwatch.noaa.gov/erddap/griddap/noaacwSMAPsssDaily.das";
    String infoUrl "https://coastwatch.noaa.gov/cw/satellite-data-products/sea-surface-salinity/smap.html";
    String institution "NOAA NESDIS CoastWatch";
    String instrument "SMAP";
    String keywords "agencies, agencies-u.s, altitude, atlas, atmosphere, atmospheric, atmospheric/ocean, climate, coastwatch, commerce, composite, daily, data, day, density, department, doc, doc/noaa/nesdis/star, earth, earth observation satellites>earth explorers>smos>soil moisture and ocean salinity, earth remote sensing instruments>passive remote sensing>imaging spectrometers/radiometers>smap l-band radiometer, Earth Science > Atmosphere > Atmospheric Winds > Surface Winds, Earth Science > Climate Indicators > Atmospheric/Ocean Indicators > Surface Salinity, Earth Science > Oceans > Salinity/Density > Salinity, federal, files, gcmd, GCMD:EARTH SCIENCE > OCEANS > SALINITY/DENSITY, government, GOVERNMENT AGENCIES-U.S. FEDERAL AGENCIES > DOC > NOAA, indicators, jet, jpl, L2, l2_lat, l2_lon, l2_time, laboratory, latitude, longitude, minus, near, near real time, noaa, none:soil moisture active passive, nrt, ocean, oceans, practical, propulsion, real, salinity, salinity/density, science, sea, sea surface salinity, sea_water_practical_salinity, seawater, smap, smapsss3scandailyagglom, speed, sss, sss_dif, ssw, star, surface, time, US, value, water, wind, wind_speed, winds, world";
    String keywords_vocabulary "GCMD Science Keywords";
    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.";
    String mission "Soil Moisture Active Passive (SMAP)";
    String naming_authority "gov.noaa.coastwatch";
    Float64 Northernmost_Northing 89.875;
    String platform "SMAP";
    String product_name "SP_D2024106_Map_SATSSS_data_1day.nc";
    String product_version "V5.0_NRT";
    String project "STAR Sea Surface Salinity Team (NOAA/NESDIS/STAR/SSS)";
    String publisher_email "coastwatch.info@noaa.gov";
    String publisher_name "NOAA CoastWatch";
    String publisher_type "institution";
    String publisher_url "https://coastwatch.noaa.gov";
    String references "SMAP Salinity and Wind Speed User's Guide, Version 4.0, JPL";
    String source "NASA JPL";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.875;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Sea Surface Salinity - Near Real Time - SMAP Daily Composite. CoastWatch/OceanWatch Level-3 SSS products are generated directly from the NASA Jet Propulsion Laboratory (JPL) SMAP Level-2B SSS near real time swath HDF5 files. These products improve the application of satellite SSS products in NOAA by minimizing the data latency to within 24 hours of Level-2 data availability";
    String testOutOfDate "now-2days";
    String time_coverage_end "2024-04-15T12:00:00Z";
    String time_coverage_start "2015-04-01T12:00:00Z";
    String time_coverage_stop "2024-106T17:16:11.000";
    String title "Sea Surface Salinity, SMAP, Near Real-Time, Global 0.25°, 2015-present, Daily";
    Float64 Westernmost_Easting -179.875;
  }
}

 

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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 Data Access Protocol (DAP) and its projection constraints.

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://coastwatch.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://coastwatch.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.