ERDDAP > griddap > Data Access Form

Dataset Title:	Kd490, Aqua MODIS - Daily, 2002-present. v.2018.0
Institution:	NASA/GSFC OBPG   (Dataset ID: aqua_kd490_1d_2018_0)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (Centered Time, UTC)				7250	1 day 0h 4m 22s (uneven)
latitude (degrees_north)				4320	-0.04166667 (even)
longitude (degrees_east)				8640	0.04166667 (even)

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

Kd_490 (Diffuse attenuation coefficient at 490 nm, KD2 algorithm, m-1)

File type: (more info) .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 (lat lon data only; lon 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,lat,lon,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 lat lon data; lon must be all below or all above 180). .kml - View a Google Earth .kml file (for lat, lon 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).

(Documentation / Bypass this form)
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.025784e+9, 1.6539984e+9;
    String axis "T";
    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";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float32 _FillValue NaN;
    Float32 actual_range -89.97917, 89.97916;
    String axis "Y";
    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 {
    Int32 _ChunkSizes 8640;
    String _CoordinateAxisType "Lon";
    Float32 _FillValue NaN;
    Float32 actual_range 0.0208387, 359.9792;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float32 valid_max 360.0;
    Float32 valid_min 0.0;
  }
  Kd_490 {
    Float32 _FillValue NaN;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum 0.01;
    String colorBarScale "Log";
    String ioos_category "Optical Properties";
    String long_name "Diffuse attenuation coefficient at 490 nm, KD2 algorithm";
    String units "m-1";
    Float32 valid_max 6.0;
    Float32 valid_min 0.01;
  }
  NC_GLOBAL {
    String _lastModified "2022-06-01T05:29:53.000Z";
    String _NCProperties "version=2,netcdf=4.7.3,hdf5=1.12.0,";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6 ACDD-1.3, COARDS";
    String creator_email "data@oceancolor.gsfc.nasa.gov";
    String creator_name "NASA/GSFC/OBPG";
    String creator_type "group";
    String creator_url "https://oceandata.sci.gsfc.nasa.gov";
    String date_created "2019-02-21T11:14:26Z";
    Float64 Easternmost_Easting 359.9792;
    Float64 geospatial_lat_max 89.97916;
    Float64 geospatial_lat_min -89.97917;
    Float64 geospatial_lat_resolution 0.04166666589488307;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.9792;
    Float64 geospatial_lon_min 0.0208387;
    Float64 geospatial_lon_resolution 0.041666669903924064;
    String geospatial_lon_units "degrees_east";
    String history 
"Wed Jun  1 07:20:39 2022: ncatted -O -a sw_point_longitude,global,o,f,0.02083333 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:39 2022: ncatted -O -a geospatial_lon_min,global,o,f,0.0 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:39 2022: ncatted -O -a geospatial_lon_max,global,o,f,360.0 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:39 2022: ncatted -O -a easternmost_longitude,global,o,f,360.0 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:39 2022: ncatted -O -a westernmost_longitude,global,o,f,0.0 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:39 2022: ncatted -O -a valid_max,lon,o,f,360.0 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:39 2022: ncatted -O -a valid_min,lon,o,f,0.0 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:38 2022: ncap2 -O -s where(lon<0) lon=lon+360 A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
Wed Jun  1 07:20:36 2022: ncks -O --msa_usr_rdr -d lon,0.0,180.0 -d lon,-180.0,0.0 A2022151.L3m_DAY_KD490_Kd_490_4km.nc A2022151.L3m_DAY_KD490_Kd_490_4km-0-360.nc
l3mapgen par=A2022151.L3m_DAY_KD490_Kd_490_4km.nc.param 
2023-03-26T09:45:00Z (local files)
2023-03-26T09:45:00Z https://oceanwatch.pifsc.noaa.gov/erddap/griddap/aqua_kd490_1d_2018_0.das";
    String id "A2022151.L3b_DAY_KD490.nc/L3/A2022151.L3b_DAY_KD490.nc";
    String identifier_product_doi "10.5067/AQUA/MODIS/L3M/KD490/2018";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://oceandata.sci.gsfc.nasa.gov";
    String institution "NASA/GSFC OBPG";
    String instrument "MODIS";
    String keywords "algorithm, aqua, attenuation, biology, center, coefficient, color, data, diffuse, flight, goddard, group, gsfc, image, imaging, kd2, Kd_490, L3, level, level-3, mapped, moderate, modis, modisa, nasa, obpg, ocean, optical, optical properties, palette, processing, properties, resolution, smi, space, spectroradiometer, standard";
    String l2_flag_names "ATMFAIL,LAND,HILT,HISATZEN,STRAYLIGHT,CLDICE,COCCOLITH,LOWLW,CHLWARN,CHLFAIL,NAVWARN,MAXAERITER,ATMWARN,HISOLZEN,NAVFAIL,FILTER,HIGLINT";
    String license "https://science.nasa.gov/earth-science/earth-science-data/data-information-policy/";
    String map_projection "Equidistant Cylindrical";
    String measure "Mean";
    String naming_authority "gov.nasa.gsfc.sci.oceandata";
    String NCO "netCDF Operators version 4.7.5 (Homepage = http://nco.sf.net, Code = https://github.com/nco/nco)";
    Int32 nco_openmp_thread_number 1;
    Float64 Northernmost_Northing 89.97916;
    String platform "Aqua";
    String processing_level "L3 Mapped";
    String processing_version "2018.1QLP";
    String product_name "A2022151.L3m_DAY_KD490_Kd_490_4km.nc";
    String project "Ocean Biology Processing Group (NASA/GSFC/OBPG)";
    String publisher_email "data@oceancolor.gsfc.nasa.gov";
    String publisher_name "NASA/GSFC/OBPG";
    String publisher_type "group";
    String publisher_url "https://oceandata.sci.gsfc.nasa.gov";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -89.97917;
    String spatialResolution "4.64 km";
    String standard_name_vocabulary "CF Standard Name Table v36";
    String summary "Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua - Daily Ocean Color. Diffuse attenuation coefficient at 490 nm, KD2 algorithm. 2002 - present. spatial resolution = 4.64km";
    String temporal_range "day";
    String time_coverage_end "2022-05-31T12:00:00Z";
    String time_coverage_start "2002-07-04T12:00:00Z";
    String title "Kd490, Aqua MODIS - Daily, 2002-present. v.2018.0";
    Float64 Westernmost_Easting 0.0208387;
  }
}

 

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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[(2015-06-09T09:00:00Z)][(-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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