ERDDAP > griddap > Data Access Form

Dataset Title:	Kd490, NOAA S-NPP VIIRS, Science Quality, U.S. East Coast 750m, Level 3, 2012- present, Seasonal
Institution:	NOAA NESDIS CoastWatch East Coast Node   (Dataset ID: noaacwecnNPPVIIRSSQkd490EastCoastSeasonal)
Information:	Summary | License | FGDC | ISO 19115 | Metadata | Background | Files | Make a graph

 

Dimensions	Start	Stride	Stop	Size	Spacing
time (UTC)				51	91 days 5h 39m 49s (uneven)
level (Altitude, m)				1	(just one value)
latitude (degrees_north)				3885	-0.006168588 (even)
longitude (degrees_east)				4074	0.006168588 (even)

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

kd_490 (Diffuse Attenuation Coefficient at 490 nm, m^-1)

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).

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

Attributes {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.32938628391e+9, 1.723525755582e+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";
  }
  level {
    Float64 actual_range 0.0, 0.0;
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 22.107128596152897, 46.0659239654323;
    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 -85.07597103632074, -59.95131255561142;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  kd_490 {
    UInt32 _ChunkSizes 1, 1, 512, 512;
    Float32 _FillValue NaN;
    String cell_methods "area: mean";
    Float64 colorBarMaximum 6.0;
    Float64 colorBarMinimum 0.02;
    String colorBarPalette "Rainbow";
    String colorBarScale "Log";
    String grid_mapping "coord_ref";
    String ioos_category "Optical Properties";
    String long_name "Diffuse Attenuation Coefficient at 490 nm";
    Float32 missing_value NaN;
    String source "noaa_mecb_kd_490_algorithm noaa_mecb_bmw_atmospheric_correction";
    String standard_name "diffuse_attenuation_coefficient_of_downwelling_radiative_flux_in_sea_water";
    String units "m^-1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "ronald.vogel at noaa.gov";
    String creator_name "NOAA CoastWatch East Coast Node";
    String creator_type "institution";
    String creator_url "https://eastcoast.coastwatch.noaa.gov";
    Float64 Easternmost_Easting -59.95131255561142;
    Float64 geospatial_lat_max 46.0659239654323;
    Float64 geospatial_lat_min 22.107128596152897;
    Float64 geospatial_lat_resolution 0.006168587891163594;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -59.95131255561142;
    Float64 geospatial_lon_min -85.07597103632074;
    Float64 geospatial_lon_resolution 0.006168587891163593;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-12-13T23:57:44Z (local files)
2024-12-13T23:57:44Z https://coastwatch.noaa.gov/erddap/griddap/noaacwecnNPPVIIRSSQkd490EastCoastSeasonal.das";
    String infoUrl "https://eastcoast.coastwatch.noaa.gov/cw_viirs_k490.php";
    String institution "NOAA NESDIS CoastWatch East Coast Node";
    String instrument "Visible Infrared Imaging Radiometer Suite (VIIRS)";
    String keywords "color, data, diffuse attenuation coefficient at 490nm, downwelling radiative flux, downwelling spectral irradiance, Earth Science > Oceans > Ocean Optics > Attenuation/Transmission, Earth Science > Oceans > Ocean Optics > Extinction Coefficients, Earth Science > Oceans > Ocean Optics > Ocean Color, Earth Science > Oceans > Ocean Optics > Turbidity, Earth Science > Oceans > Water Quality, image, imager, imager/radiometer, Kd-490, Kd490, kd490, kd_490, L3, level 3, level-3, light attenuation, mapped, ocean, ocean color, oceans, optical, polar-orbiting, radiance, radiometer, remote sensing, s-npp, satellite, sea, seasonal, seawater, snpp, VIIRS, viirs, visible, water, water quality";
    String keywords_vocabulary "NASA Global Change Master Directory (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, CoastWatch, NOAA, nor the US Government, nor any of their employees or contractors, make 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 46.0659239654323;
    String satellite "Suomi National Polar-orbiting Partnership (S-NPP)";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 22.107128596152897;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "Seasonal average diffuse attenuation coefficient at 490nm (Kd490) for the U.S. East Coast, from the VIIRS instrument aboard the S-NPP satellite, 2012-present, is produced using the Wang et al. (2009) algorithm, in which separate algorithms for clear open ocean and turbid coastal waters are weighted into a combined product. This approach improves accuracy across ocean conditions. Atmospheric correction uses the near-infrared (NIR) approach of Jiang and Wang (2014), referred to as the BMW atmospheric correction. The individual overpasses are composited into daily mean grids (~840m), then the daily mean grids are averaged into seasonal gridded chlorophyll-a. Data in the last year of the series represent near real-time data and are of lesser accuracy than the science-quality data of the years before the last year. Seasons represent the periods January to March, April to June, July to September, and October to December. More info: https://eastcoast.coastwatch.noaa.gov/cw_viirs_k490.php";
    String time_coverage_end "2024-08-13T05:09:15Z";
    String time_coverage_start "2012-02-16T09:58:03Z";
    String title "Kd490, NOAA S-NPP VIIRS, Science Quality, U.S. East Coast 750m, Level 3, 2012-present, Seasonal";
    Float64 Westernmost_Easting -85.07597103632074;
  }
}

 

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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.