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Dataset Title: | NWA MODIS-AQUA CHL_POLY4 2023-07-31 |
Institution: | dfo_bio (Dataset ID: bio_remote_sensing_modis_aqua_chl_poly4) |
Information: | Summary | License | FGDC | ISO 19115 | Metadata | Background | Data Access Form | Files |
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Attributes { time { String _CoordinateAxisType "Time"; Float64 actual_range 1.0257408e+9, 1.6907616e+9; String axis "T"; 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 39.020833333333336, 81.97916666666667; 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 -94.97916666666667, -42.020833333333336; String axis "X"; String ioos_category "Location"; String long_name "Longitude"; String standard_name "longitude"; String units "degrees_east"; } chlor_a { Float32 _FillValue NaN; Float64 colorBarMaximum 30.0; Float64 colorBarMinimum 0.03; String colorBarScale "Log"; String ioos_category "Ocean Color"; String long_name "Chlorophyll-a Concentration (POLY4v2 model with coefficients optimized to MODIS-AQUA and Northwest Atlantic)"; String standard_name "mass_concentration_of_chlorophyll_a_in_sea_water"; String units "mg m-3"; Float32 valid_max 100.0; Float32 valid_min 0.0; } NC_GLOBAL { String cdm_data_type "Grid"; String Conventions "CF-1.6, COARDS, ACDD-1.3"; String creator_email "Stephanie.Clay@dfo-mpo.gc.ca"; String creator_group "SOPhyE (Satellite Ocean colour and Phytoplankton Ecology group), Ocean Monitoring and Modelling Section"; String creator_name "Stephanie Clay"; String creator_type "person"; String creator_url "https://bio-rsg.github.io/"; String date_created "2024-02-26T13:42:26Z"; Float64 Easternmost_Easting -42.020833333333336; String geographic_crs_epsg_code "EPSG:4326"; Float64 geospatial_lat_max 81.97916666666667; Float64 geospatial_lat_min 39.020833333333336; Float64 geospatial_lat_resolution 0.04166666666666667; String geospatial_lat_units "degrees_north"; Float64 geospatial_lon_max -42.020833333333336; Float64 geospatial_lon_min -94.97916666666667; Float64 geospatial_lon_resolution 0.04166666666666667; String geospatial_lon_units "degrees_east"; String history "Created with make_mapped_netcdf.R. Input data are 4km-resolution level-3 binned remote sensing reflectances (Rrs) from NASA OBPG, subset to the region of interest and used in conjunction with the most recent set of regionally-tuned parameters to generate the level-3 binned product. The data is then mapped using a Plate Carrée projection and an area-weighted mean for pixels with multiple overlapping bins. 2024-10-05T05:58:11Z (local files) 2024-10-05T05:58:11Z https://cioosatlantic.ca/griddap/bio_remote_sensing_modis_aqua_chl_poly4.das"; String infoUrl "https://bio-rsg.github.io/"; String institution "dfo_bio"; String keywords "agencies, agencies-non-us, aqua, atlantic, based, bio, ca/dfo/bio, canada, chemistry, chl, chlor_a, chlorophyll, chlorophyll-a, coefficients, color, concentration, data, department, dfo, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, Earth Science > Oceans > Ocean Chemistry > Pigments > Chlorophyll, Earth Science > Oceans > Ocean Optics > Chlorophyll > Chlorophyll Concentration, fisheries, government, imaging, latitude, longitude, mass, mass_concentration_of_chlorophyll_a_in_sea_water, model, moderate, modis, modis-aqua, non, northwest, nwa, observation, ocean, ocean color, oceans, optics, optimized, pigments, platforms, Platforms > Space-based Platforms > Earth Observation Satellites > Aqua, poly4, poly4v2, providers, Providers > GOVERNMENT AGENCIES-NON-US > CANADA > CA/DFO/BIO, resolution, satellites, science, sea, seawater, space, space-based, spectroradiometer, time, water, with"; String keywords_vocabulary "GCMD Science Keywords"; String license "https://creativecommons.org/licenses/by/4.0/"; String map_projection "Equidistant Cylindrical (Plate Carrée)"; String mission "AQUA"; Float64 Northernmost_Northing 81.97916666666667; String platform "AQUA"; String POLY4v2_coefficients "0.49318,-3.86911,-0.83267,1.19094,0.9436"; String processing_level "L3 Mapped"; String product_name "AQUA_MODIS.20230731.L3b.DAY.CHL_POLY4.NWA.mapped.nc"; String projected_crs_epsg_code "EPSG:4087"; String references "Clay, S.; Peña, A.; DeTracey, B.; Devred, E. Evaluation of Satellite-Based Algorithms to Retrieve Chlorophyll-a Concentration in the Canadian Atlantic and Pacific Oceans. Remote Sens. 2019, 11, 2609."; String region "Northwest Atlantic"; String reprocessing "R2022.0"; String sensor "MODIS"; String source "POLY4v2 chlorophyll-a generated using remote sensing reflectance (Rrs) data from NASA Ocean Biology Processing Group (OBPG, https://oceancolor.gsfc.nasa.gov)"; String sourceUrl "(local files)"; Float64 Southernmost_Northing 39.020833333333336; String spatial_resolution "4.64 km at equator"; String standard_name_vocabulary "CF Standard Name Table v79"; String summary "NWA Moderate Resolution Imaging Spectroradiometer (MODIS)-AQUA CHL_POLY4"; String temporal_range "day"; String time "2023-07-31"; String time_coverage_end "2023-07-31T00:00:00Z"; String time_coverage_start "2002-07-04T00:00:00Z"; String title "NWA MODIS-AQUA CHL_POLY4 2023-07-31"; String tools "https://github.com/BIO-RSG/oceancolouR"; Float64 Westernmost_Easting -94.97916666666667; } }
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.