ERDDAP > griddap > Data Access Form

Dataset Title:	VIIRS Suomi NPP 8-Day 750 m Composite Northwest Atlantic
Institution:	???   (Dataset ID: VIIRS_NWATL_8day)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				1	(just one value)
latitude (degrees_north)				4500	0.008 (uneven)
longitude (degrees_east)				5000	0.01 (uneven)

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

chl_oc3 (Chlorophyll Concentration, OC3 Algorithm, mg m^-3)

sst (Sea Surface Temperature, DegreesC)

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

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    UInt32 _ChunkSizes 1024;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.761609599e+9, 1.761609599e+9;
    String axis "T";
    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";
    Float64 actual_range 16.007999420166016, 52.0;
    String axis "Y";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -100.0, -50.0099983215332;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  chl_oc3 {
    UInt32 _ChunkSizes 1, 900, 1000;
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll Concentration, OC3 Algorithm";
    String standard_name "concentration_of_chlorophyll_in_sea_water";
    String units "mg m^-3";
  }
  sst {
    UInt32 _ChunkSizes 1, 900, 1000;
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 32.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Temperature";
    String long_name "Sea Surface Temperature";
    String standard_name "sea_surface_temperature";
    String units "DegreesC";
  }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.9.2,hdf5=1.14.5";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    Float64 Easternmost_Easting -50.0099983215332;
    Float64 geospatial_lat_max 52.0;
    Float64 geospatial_lat_min 16.007999420166016;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -50.0099983215332;
    Float64 geospatial_lon_min -100.0;
    String geospatial_lon_units "degrees_east";
    String history 
"2025-10-31T06:50:48Z (local files)
2025-10-31T06:50:48Z http://basin.ceoe.udel.edu/erddap/griddap/VIIRS_NWATL_8day.das";
    String infoUrl "???";
    String institution "???";
    String keywords "algorithm, chemistry, chl_oc3, chlorophyll, color, concentration, concentration_of_chlorophyll_in_sea_water, data, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature, local, oc3, ocean, ocean color, oceans, science, sea, sea_surface_temperature, seawater, source, sst, surface, temperature, time, water";
    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.";
    Float64 Northernmost_Northing 52.0;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 16.007999420166016;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "VIIRS Suomi NPP 8-Day 750 m Composite Northwest Atlantic";
    String time_coverage_end "2025-10-27T23:59:59Z";
    String time_coverage_start "2025-10-27T23:59:59Z";
    String title "VIIRS Suomi NPP 8-Day 750 m Composite Northwest Atlantic";
    Float64 Westernmost_Easting -100.0;
  }
}

 

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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.

 

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