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ERDDAP at NOAA CoastWatch
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NOAA CoastWatch Central Operations |
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Dataset Title: | Chlorophyll, OLCI-VIIRS Weighted Merge, Chesapeake Bay, 300m, Level 3, 2016- present, 7-day Median ![]() |
Institution: | NOAA NOS National Centers for Coastal Ocean Science (Dataset ID: noaacwecnOLCImultisensorCHLeastcoast7Day) |
Information: | Summary ![]() ![]() ![]() |
Attributes { time { String _CoordinateAxisType "Time"; Float64 actual_range 1.4618016e+9, 1.748304e+9; String axis "T"; String climatology "climatology_bounds"; 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"; Float32 actual_range 36.60303, 40.1497; String axis "Y"; String ioos_category "Location"; String long_name "Latitude"; String standard_name "latitude"; String units "degrees_north"; } longitude { String _CoordinateAxisType "Lon"; Float32 actual_range -77.76917, -73.86996; String axis "X"; String ioos_category "Location"; String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; } chlora { Int32 _FillValue 2147483647; String cell_methods "area: mean time: mean within days time: mean over days"; Float64 colorBarMaximum 135.0; Float64 colorBarMinimum 0.1; String colorBarScale "Log"; String display_scale "log"; String ioos_category "Ocean Color"; String long_name "Chlorophyll-a from 2-band RE10 Coastal Processing"; Int32 missing_value 2147483647; String standard_name "mass_concentration_of_chlorophyll_a_in_sea_water"; String units "mg m-3"; } NC_GLOBAL { String cdm_data_type "Grid"; String comment "CoastWatch CF NetCDF"; String Conventions "CF-1.10, COARDS, ACDD-1.3"; String creator_name "NOAA"; String creator_type "institution"; String cw_satellite "Sentinel-3"; String defaultGraphQuery "chlora%5B((last)%5D%5B((40.1497):(36.60303)%5D%5B((-77.76917):(-73.86996)%5D%26.draw=surface%26.vars=longitude%7Clatitude%7Cchlora%26.colorBar=nccos%7CC%7CLog%7C.1%7C135%7C%26.land=over%26.bgColor=0xffccccff"; Float64 Easternmost_Easting -73.86996; Float64 geospatial_lat_max 40.1497; Float64 geospatial_lat_min 36.60303; Float64 geospatial_lat_resolution 0.0030391345329905794; String geospatial_lat_units "degrees_north"; Float64 geospatial_lon_max -73.86996; Float64 geospatial_lon_min -77.76917; Float64 geospatial_lon_resolution 0.003039134840218236; String geospatial_lon_units "degrees_east"; Float64 grid_mapping_inverse_flattening 298.257223563; String grid_mapping_long_name "Geographic with WGS84"; Float64 grid_mapping_longitude_of_prime_meridian 0.0; String grid_mapping_name "latitude_longitude"; Float64 grid_mapping_semi_major_axis 6378137.0; String history "NetCDF generated from NOAA NCCOS GeoTIFF 2025-07-09T18:48:06Z (local files) 2025-07-09T18:48:06Z https://coastwatch.noaa.gov/erddap/griddap/noaacwecnOLCImultisensorCHLeastcoast7Day.das"; String infoUrl "https://eastcoast.coastwatch.noaa.gov/cw_avhrr-viirs_sst.php"; String institution "NOAA NOS National Centers for Coastal Ocean Science"; String instrument "Ocean and Land Colour Instrument (OLCI) and Visible Infrared Imaging Radiometer Suite (VIIRS) weighted merge"; String keywords "2-band, band, centers, chemistry, chlora, chlorophyll, chlorophyll-a, climate, coastal, coastwatch, color, common, concentration, copernicus, data, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, forecast, format, mass, mass_concentration_of_chlorophyll_a_in_sea_water, national, nccos, network, noaa, nos, ocean, ocean color, oceans, processing, program, re10, science, sea, seawater, sentinel, sentinel-3, service, time, 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.; Sentinel-3 data courtesy of Copernicus Program."; Float64 Northernmost_Northing 40.1497; String platform "Sentinel-3"; String references "pending"; String satellite "Sentinel-3A, Sentinel-3B, Suomi National Polar-orbiting Partnership (S-NPP), NOAA-20"; String source "Sentinel-3 OLCI"; String sourceUrl "(local files)"; Float64 Southernmost_Northing 36.60303; String standard_name_vocabulary "CF Standard Name Table v70"; String summary "7-day median chlorophyll-a concentration for Chesapeake Bay from the OLCI and VIIRS instruments, 2016-present, is produced using the Gilerson RE10 algorithm for OLCI and the standard OC3 algorithm for VIIRS. The two chlorophylls are then merged using a weighting scheme to more accurately represent regions of high chlorophyll using OLCI and regions of low chlorophyll with VIIRS."; String time_coverage_end "2025-05-27T00:00:00Z"; String time_coverage_start "2016-04-28T00:00:00Z"; String title "Chlorophyll, OLCI-VIIRS Weighted Merge, Chesapeake Bay, 300m, Level 3, 2016-present, 7-day Median"; Float64 Westernmost_Easting -77.76917; } }
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.