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| Dataset Title: | Relative Difference of Net Primary Productivity, VIIRS SNPP vs MODIS Aqua, 9Km, Monthly, 2013- 2022, Global 
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| Institution: | NOAA/NESDIS/STAR/CoastWatch/West Coast (Dataset ID: netpp_delta_snpp_modis) |
| Information: | Summary
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| FGDC
| ISO 19115
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Attributes {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.3583232e+9, 1.6711776e+9;
String axis "T";
String calendar "gregorian";
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";
Float64 actual_range -89.95834, 89.95834;
String axis "Y";
String ioos_category "Location";
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
Float64 valid_max 90.0;
Float64 valid_min -90.0;
}
longitude {
String _CoordinateAxisType "Lon";
Float64 actual_range -179.9583, 179.9583;
String axis "X";
String ioos_category "Location";
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
}
delta {
Float32 _FillValue -999.0;
String colorBarContinuous "false";
String colorBarMaximum "0.4";
String colorBarMinimum "-0.4";
Int32 colorBarNSections 8;
String coverage_content_type "modelResult";
String ioos_category "Other";
String long_name "Relative Difference of Net Primary Productivity";
Float32 missing_value -999.0;
String source "NOAA CoastWatch West Coast Node";
String units "1";
}
NC_GLOBAL {
String acknowledgement "This project was supported by the NOAA Office of Satellite Ground Services to CoastWatch West Coast Node via NOAA SWFSC. Support was also provided by NOAA CoastWatch.";
String cdm_data_type "Grid";
String contributor "Dale Robinson, Isaac Schroeder";
String contributor_role "development and project management, production code";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_name "NOAA CoastWatch West Coast Node";
String creator_type "institution";
String creator_url "https://coastwatch.pfeg.noaa.gov/";
Float64 Easternmost_Easting 179.9583;
Float64 geospatial_lat_max 89.95834;
Float64 geospatial_lat_min -89.95834;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max 179.9583;
Float64 geospatial_lon_min -179.9583;
String geospatial_lon_units "degrees_east";
String history
"Tue Apr 9 13:19:40 2024: The relative difference was calculated from VIIRS-SNPP and MODIS-Aqua primary productivity data using Python code stored at https://github.com/CoastWatch-WestCoast/interim_primary_productivity
2025-05-01T11:41:51Z (local files)
2025-05-01T11:41:51Z https://coastwatch.pfeg.noaa.gov/wcn/erddap/griddap/netpp_delta_snpp_modis.das";
String id "delta_primprod_snpp_monthly_9km";
String infoUrl "https://coastwatch.pfeg.noaa.gov/projects/netpp";
String institution "NOAA/NESDIS/STAR/CoastWatch/West Coast";
String instrument "VIIRS, MODIS";
String keywords "calculating, data, latitude, longitude, psi, summation, time";
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 map_projection "geographic";
String naming_authority "gov.noaa.pfeg.coastwatch";
Float64 Northernmost_Northing 89.95834;
String platform "NPP, Aqua";
String proj4_string "+proj=eqc +lat_ts=0 +lat_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs +lon_0=0.000000";
String project "NOAA CoastWatch Interim Primary Productivity";
String publisher_name "NOAA/NMFS/SWFSC/ERD, NOAA/NESDIS/STAR/CoastWatch/West Coast Node";
String publisher_type "group";
String publisher_url "https://coastwatch.pfeg.noaa.gov";
String references "Limnol. Oceanogr. 42 (1997) 1-20.";
String source "primary productivity measurements based on satellite observations from VIIRS-SNPP and MODIS-Aqua";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -89.95834;
String spatialResolution "9.28 km";
String standard_name_vocabulary "CF Standard Name Table v70";
String summary "The relative difference (rel_delta) between primary productivity (netPP) calculated using VIIRS-SNPP and MODIS-Aqua primary productivity data. For each pixel, rel_delta is calculated as netPP(viirs)- netPP(modis) divided by netPP(modis). Primary productivity was calculated as described by Behrenfeld and Falkowski 1997. This dataset contains pixel-by-pixel rel_delta for the globe for each month between January 2013 to December 2022 at 9 kilometer spatial resolution.";
String time_coverage_end "2022-12-16T08:00:00Z";
String time_coverage_resolution "P1M";
String time_coverage_start "2013-01-16T08:00:00Z";
String title
"Relative Difference of Net Primary Productivity, VIIRS SNPP vs MODIS Aqua, 9Km, Monthly, 2013-
2022, Global";
Float64 Westernmost_Easting -179.9583;
}
}
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.
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.