Data Access Form

Dataset Title:	VIIRSN, Suomi-NPP, Level-3 SMI, NASA, Global, 4km, POC, R2018, 2012-present, Monthly, Lon0360
Institution:	NASA/GSFC OBPG (Dataset ID: erdVH2018pocmday_Lon0360)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (Centered Time, UTC)	127	30 days 10h 17m 9s (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)

poc (Particulate Organic Carbon, D. Stramski, 2007 (443/555 version), mg m^-3)

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 1.3265856e+9, 1.6578432e+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 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 {
    String _CoordinateAxisType "Lon";
    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";
  }
  poc {
    Float32 _FillValue -153.4;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Ocean Color";
    String long_name "Particulate Organic Carbon, D. Stramski, 2007 (443/555 version)";
    String references "Stramski, D., et al. \"Relationships between the surface concentration of particulate organic carbon and optical properties in the eastern South Pacific and eastern Atlantic Oceans.\" Biogeosciences 5.1 (2008): 171-201.";
    String units "mg m^-3";
    Float32 valid_max 1000.0;
    Float32 valid_min 0.0;
  }
  NC_GLOBAL {
    String _lastModified "2022-08-19T01:16:54.000Z";
    String cdm_data_type "Grid";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    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 "2022-08-19T01:16:54.000Z";
    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 
"SNPP data files are downloaded ASAP from https://oceandata.sci.gsfc.nasa.gov/VIIRS-SNPP/Mapped/Monthly/4km/poc/ to NOAA NMFS SWFSC ERD (erd.data@noaa.gov).
NOAA NMFS SWFSC ERD (erd.data@noaa.gov) uses ERDDAP to add the time variable and slightly modify the metadata.
Direct read of HDF4 file through CDM library.
2024-11-07T07:43:02Z https://oceandata.sci.gsfc.nasa.gov/VIIRS-SNPP/Mapped/Monthly/4km/poc/
2024-11-07T07:43:02Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdVH2018pocmday_Lon0360.das";
    String identifier_product_doi "10.5067/NPP/VIIRS/L3M/POC/2018";
    String identifier_product_doi_authority "https://dx.doi.org";
    String infoUrl "https://oceancolor.gsfc.nasa.gov/data/viirs-snpp/";
    String institution "NASA/GSFC OBPG";
    String instrument "VIIRS";
    String keywords "4km, carbon, chemistry, color, concentration, gsfc, image, joint, jpss, level, level-3, mapped, mass, mass_concentration_of_particulate_organic_carbon_in_sea_water, mean, monthly, nasa, noaa, npoess, npp, obpg, ocean, ocean color, oceans, orbiting, organic, particulate, poc, polar, satellite, sea, seawater, smi, standard, suomi, viirs, viirsn, water";
    String keywords_vocabulary "GCMD Science Keywords";
    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/
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 map_projection "Equidistant Cylindrical";
    String measure "Mean";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 89.97916;
    String platform "Suomi-NPP";
    String processing_level "L3 Mapped";
    String processing_version "2018.0";
    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_url "https://oceandata.sci.gsfc.nasa.gov";
    String references "Stramski, D., et al. \"Relationships between the surface concentration of particulate organic carbon and optical properties in the eastern South Pacific and eastern Atlantic Oceans.\" Biogeosciences 5.1 (2008): 171-201.";
    String sourceUrl "https://oceandata.sci.gsfc.nasa.gov/VIIRS-SNPP/Mapped/Monthly/4km/poc/";
    Float64 Southernmost_Northing -89.97917;
    String spatialResolution "4.64 km";
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "R2018 of Level-3 Standard Mapped Image (SMI), Global, 4km, Particulate Organic Carbon (POC), Monthly composite data from the Visible and Infrared Imager/Radiometer Suite (VIIRS), as processed by NASA GSFC Ocean Biology Processing Group (OBPG). VIIRS is a multi-disciplinary instrument that flies on the Suomi-NPP (National Polar-orbiting Partnership) satellite.  Suomi-NPP is the initial spacecraft in the JPSS (Joint Polar Satellite Systems) series of spacecraft. JPSS is our Nation's next generation polar-orbiting operational environmental satellite system. JPSS is a collaborative program between NOAA and its acquisition agent NASA. VIIRS is the successor to MODIS for Earth science data product generation. (This version of the VH data was first released on 2017-12-12.)";
    String temporal_range "month";
    String testOutOfDate "now-60days";
    String time_coverage_end "2022-07-15T00:00:00Z";
    String time_coverage_start "2012-01-15T00:00:00Z";
    String title "VIIRSN, Suomi-NPP, Level-3 SMI, NASA, Global, 4km, POC, R2018, 2012-present, Monthly, Lon0360";
    Float64 Westernmost_Easting 0.0208387;
  }
}

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.