NOAA ERDDAP
Easier access to scientific data
log in    
Brought to you by NOAA NMFS SWFSC ERD    

ERDDAP > griddap > Data Access Form ?

Dataset Title:  Chlorophyll a, North Pacific, NOAA VIIRS, 750m resolution, 2015-present (3 Day
Composite)
Subscribe RSS
Institution:  NOAA NMFS SWFSC ERD   (Dataset ID: erdVHNchla3day)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (Centered Time, UTC) ?      799    1 day 10h 33m 23s (uneven)
  < slider >
 altitude (m) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      11985    -0.0075 (even)
  < slider >
 longitude (degrees_east) ?      9338    0.0075 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 chla (Chlorophyll a, mg m^-3) ?

File type: (more info)

(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 1.424736e+9, 1.5240096e+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";
  }
  altitude {
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "up";
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    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 -0.10875, 89.77125;
    String axis "Y";
    String coordsys "geographic";
    String ioos_category "Location";
    String long_name "Latitude";
    String point_spacing "even";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 actual_range -180.03375, -110.00625;
    String axis "X";
    String coordsys "geographic";
    String ioos_category "Location";
    String long_name "Longitude";
    String point_spacing "even";
    String standard_name "longitude";
    String units "degrees_east";
  }
  chla {
    Float32 _FillValue -999.0;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String coordsys "geographic";
    String ioos_category "Ocean Color";
    String long_name "Chlorophyll a";
    Float32 missing_value -999.0;
    String standard_name "mass_concentration_chlorophyll_concentration_in_sea_water";
    String units "mg m^-3";
    Float32 valid_max 100.1;
    Float32 valid_min 0.001;
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String contact "erd.data@noaa.gov";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creation_date "Fri Apr 20 03:29:12 2018";
    String creator_email "erd.data@noaa.gov";
    String creator_name "NOAA NMFS SWFSC ERD";
    String creator_type "institution";
    String creator_url "https://www.pfeg.noaa.gov";
    Float64 Easternmost_Easting -110.00625;
    Float64 geospatial_lat_max 89.77125;
    Float64 geospatial_lat_min -0.10875;
    Float64 geospatial_lat_resolution 0.0075;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -110.00625;
    Float64 geospatial_lon_min -180.03375;
    Float64 geospatial_lon_resolution 0.007500000000000001;
    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 
"3-day composites in a geographic projection created from daily composites by erd.data@noaa.gov from daily merge files obtained from NOAA/NESDIS Center for Satellite Applications and Research at https://www.star.nesdis.noaa.gov/thredds/catalog/chloraNPPVIIRSSectorDaily. Data were processed via the processViirsChl script in the dalesLibViirsChl.py library by erd.data@noaa.gov at NOAA NMFS SWFSC ERD.
2018-04-21T19:14:59Z (local files)
2018-04-21T19:14:59Z http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdVHNchla3day.das";
    String infoUrl "https://coastwatch.pfeg.noaa.gov/infog/VHN_chla_las.html";
    String institution "NOAA NMFS SWFSC ERD";
    String keywords "1-day, 750m, altitude, center, chemistry, chla, chlorophyll, chlorophyll-a, coastwatch, color, composite, concentration, concentration_of_chlorophyll_in_sea_water, data, day, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, erd, fisheries, imager, imager/radiometer, imaging, infrared, latitude, longitude, marine, national, near, nmfs, noaa, north, npp, nrt, ocean, ocean color, oceans, orbiting, pacific, partnership, polar, polar-orbiting, radiometer, real, resolution, science, sea, seawater, service, southwest, suite, swfsc, time, viirs, visible, 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.";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 89.77125;
    String projection "Geographic";
    String publisher_email "erd.data@noaa.gov";
    String publisher_name "NOAA NMFS SWFSC ERD";
    String publisher_type "institution";
    String publisher_url "https://www.pfeg.noaa.gov";
    String references "https://www.star.nesdis.noaa.gov/smcd/spb/nsun/snpp/VIIRS/VIIRS_SDR_Users_guide.pdf";
    String satellite "Suomi-NPP";
    String sensor "VIIRS";
    String source_data "NOAA/NESDIS, VIIRS CoastWatch daily merged files: VHN2018108_2018108_chla.nc, VHN2018107_2018107_chla.nc, VHN2018106_2018106_chla.nc";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -0.10875;
    String spatial_resolution "0.0075 degree";
    String standard_name_vocabulary "CF Standard Name Table v29";
    String summary "NOAA CoastWatch distributes L3 level chlorophyll a concentration data derived from measurements take by the VIIRS sensor (Visible Infrared Imaging Radiometer Suite) aboard the Suomi-NPP satellite. Chlorophyll values were calculated using NOAA-MSL12 NRT processing with LAND+CLDICE+HIGLINT+HISATZEN+HISOLZEN masking.";
    String time_coverage_end "2018-04-18T00:00:00Z";
    String time_coverage_start "2015-02-24T00:00:00Z";
    String title "Chlorophyll a, North Pacific, NOAA VIIRS, 750m resolution, 2015-present (3 Day Composite)";
    Float64 Westernmost_Easting -180.03375;
  }
}

 

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.

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.


 
ERDDAP, Version 1.82
Disclaimers | Privacy Policy | Contact