Data Access Form

Dataset Title:	Color Producing Agent (CPA) diffuse attenuation coefficient of the photosynthetically available radiation, VIIRS, Lake Superior (2018-present)
Institution:	CoastWatch Great Lakes Node (Dataset ID: LS_KDpar_VIIRS_SQ)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (UTC)	4989	11h 30m 0s (uneven)

latitude (degrees_north)	275	0.0101146 (even)

longitude (degrees_east)	800	0.010113 (even)

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

KDpar (KDPAR, VIIRS Science Quality, EXPERIMENTAL}, Kd(PAR) m^-1)

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 1.527529422e+9, 1.73403076e+9;
    String axis "T";
    Int32 fraction_digits 0;
    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 46.290877595506, 49.0622787250686;
    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 -92.2393462144662, -84.1590606615635;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  KDpar {
    Float32 _FillValue -999.0;
    Float32 colorBarMaximum 1.0;
    Float32 colorBarMinimum 0.05;
    String grid_mapping "crs";
    String ioos_category "Optical Properties";
    String long_name "KDPAR, VIIRS Science Quality, EXPERIMENTAL}";
    String units "Kd(PAR) m^-1";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    Float32 colorBarMaximum 1.0;
    Float32 colorBarMinimum 0.05;
    String colorBarScale "Log";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    Float64 Easternmost_Easting -84.1590606615635;
    String GDAL "GDAL 3.4.3, released 2022/04/22";
    String GDAL_AREA_OR_POINT "Area";
    String GDAL_TIFFTAG_IMAGEDESCRIPTION "IDL TIFF file";
    String GDAL_TIFFTAG_SOFTWARE "IDL 9.0.0, NV5 Geospatial Solutions, Inc.";
    Float64 geospatial_lat_max 49.0622787250686;
    Float64 geospatial_lat_min 46.290877595506;
    Float64 geospatial_lat_resolution 0.010114602662637244;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -84.1590606615635;
    Float64 geospatial_lon_min -92.2393462144662;
    Float64 geospatial_lon_resolution 0.010112998188864448;
    String geospatial_lon_units "degrees_east";
    String history 
"Mon Dec 23 10:55:06 2024: GDAL CreateCopy( /mnt/cwdata/p/i/soc/2024/12/V2024347191240_LS05_kdpar.nc317896.nc, ... )
2024-12-30T14:54:37Z (local files)
2024-12-30T14:54:37Z https://apps.glerl.noaa.gov/erddap/griddap/LS_KDpar_VIIRS_SQ.das";
    String infoUrl "https://coastwatch.glerl.noaa.gov/ocean-color/ocean-color.html";
    String institution "CoastWatch Great Lakes Node";
    String keywords "agent, Band1, color, cpa, data, experimental, imager, imager/radiometer, imaging, infrared, kdpar, lake, optical, optical properties, producing, properties, quality, radiometer, science, suite, superior, time, viirs, visible";
    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 49.0622787250686;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 46.290877595506;
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "Color Producing Agent (CPA) KD(PAR), Lake Superior";
    String testOutOfDate "now-34days";
    String time_coverage_end "2024-12-12T19:12:40Z";
    String time_coverage_start "2018-05-28T17:43:42Z";
    String title "Color Producing Agent (CPA) diffuse attenuation coefficient of the photosynthetically available radiation, VIIRS, Lake Superior (2018-present)";
    Float64 Westernmost_Easting -92.2393462144662;
  }
}

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://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.