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Dataset Title:  Chlorophyll-a, Orbview-2 SeaWiFS, West US, 1997-2006, Science Quality (8 Day
Composite) DEPRECATED
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Institution:  NOAA NMFS SWFSC ERD   (Dataset ID: erdSAchla8day)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 time (Centered Time, UTC) ?      418    7 days 23h 1m 18s (uneven)
  < slider >
 altitude (m) ?      1    (just one value)
  < slider >
 latitude (degrees_north) ?      973    0.036 (even)
  < slider >
 longitude (degrees_east) ?      834    0.036 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 chlorophyll (Concentration Of Chlorophyll In Sea Water, 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 8.738496e+8, 1.1606112e+9;
    String axis "T";
    Int32 fraction_digits 0;
    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";
    Int32 fraction_digits 0;
    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 20.0, 54.992;
    String axis "Y";
    String coordsys "geographic";
    Int32 fraction_digits 6;
    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 225.012, 255.0;
    String axis "X";
    String coordsys "geographic";
    Int32 fraction_digits 6;
    String ioos_category "Location";
    String long_name "Longitude";
    String point_spacing "even";
    String standard_name "longitude";
    String units "degrees_east";
  }
  chlorophyll {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 30.0;
    Float64 colorBarMinimum 0.03;
    String colorBarScale "Log";
    String coordsys "geographic";
    Int32 fraction_digits 2;
    String ioos_category "Ocean Color";
    String long_name "Concentration Of Chlorophyll In Sea Water";
    Float32 missing_value -9999999.0;
    String standard_name "concentration_of_chlorophyll_in_sea_water";
    String units "mg m-3";
  }
  NC_GLOBAL {
    String acknowledgement "NOAA NESDIS COASTWATCH, NOAA SWFSC ERD";
    String cdm_data_type "Grid";
    String composite "true";
    String contributor_name "NASA/GSFC/DAAC, GeoEye, Andrew Thomas/U Maine";
    String contributor_role "Source of level 2 data.";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    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";
    String date_created "2007-06-08";
    String date_issued "2007-06-08";
    Float64 Easternmost_Easting 255.0;
    Float64 geospatial_lat_max 54.992;
    Float64 geospatial_lat_min 20.0;
    Float64 geospatial_lat_resolution 0.036;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 255.0;
    Float64 geospatial_lon_min 225.012;
    Float64 geospatial_lon_resolution 0.036;
    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 
"NASA/GSFC/DAAC, GeoEye, Andrew Thomas/U Maine
2007-06-08T00:01:05Z NOAA NESDIS CoastWatch WCRN and NOAA SWFSC ERD
2018-07-17T15:45:44Z http://oceanwatch.pfeg.noaa.gov/thredds/dodsC/satellite/SA/chla/8day
2018-07-17T15:45:44Z http://upwell.pfeg.noaa.gov/erddap/griddap/erdSAchla8day.das";
    String infoUrl "https://coastwatch.pfeg.noaa.gov/infog/SA_chla_las.html";
    String institution "NOAA NMFS SWFSC ERD";
    String keywords "8-day, andrew, chemistry, chlorophyll, chlorophyll-a, chlorophyll_concentration_in_sea_water, color, concentration, daac, day, degrees, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, geoeye, gsfc, maine, nasa, ocean, ocean color, oceans, orbview, orbview-2, quality, science, science quality, sea, seawater, seawifs, thomas, water, west";
    String keywords_vocabulary "GCMD Science Keywords";
    String license 
"The data may be used for free but is not intended for
legal use, since it may contain inaccuracies. Neither the data Contributor,
CoastWatch, 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.
Because the data was purchased under a NOAA contract with GeoEye, the data
can be used but not redistributed.
Images made from the data, however, can be used for any purpose.
Questions regarding data access should be directed to NOAA CoastWatch.";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 54.992;
    String origin "NASA/GSFC/DAAC, GeoEye, Andrew Thomas/U Maine";
    String processing_level "3";
    String project "CoastWatch (https://coastwatch.noaa.gov/)";
    String projection "geographic";
    String projection_type "mapped";
    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 "SeaWiFS information: https://oceancolor.gsfc.nasa.gov/SeaWiFS/ . NASA Ocean Color information: https://oceancolor.gsfc.nasa.gov/ . Processing reference: O'Reilly, J.E., Maritorena, S., Mitchell, B.G., Siegel, D.A., Carder, K.L., Garver, S.A., Kahru, M. and McClain, C. (1998). Ocean color chlorophyll algorithms for SeaWiFS. J. Geophys. Res., 103: 24, 937-24, 953. Processing reference: O'Reilly, J. E., and 21 others. 2000. Ocean color chlorophyll a algorithms for SeaWiFS, OC2 and OC4: Version 5. SeaWiFS Postlaunch Calibration and Validation Analyses, part 3. NASA SeaWiFS technical report series. pp. 8 226 22. Processing reference: Fu, G., Baith, K. S., and McClain, C. R. (1998). SeaDAS: The SeaWiFS Data Analysis System. Proceedings of \"The 4th Pacific Ocean Remote Sensing Conference\", Qingdao, China, July 28-31, 1998, 73-79. Validation reference: Hooker, S.B., and C.R. McClain (2000). The Calibration and Validation of SeaWiFS Data. Prog. Oceanogr., 45, 427-465. Science quality data source: Professor Andrew Thomas, University of Maine.";
    String satellite "Orbview-2";
    String sensor "SeaWiFS HRPT";
    String source "satellite observation: Orbview-2, SeaWiFS HRPT";
    String sourceUrl "http://oceanwatch.pfeg.noaa.gov/thredds/dodsC/satellite/SA/chla/8day";
    Float64 Southernmost_Northing 20.0;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "NOAA CoastWatch distributes chlorophyll-a concentration data from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) on the Orbview-2 satellite.  Because the data was purchased under a NOAA contract with GeoEye, the data can be used but not redistributed.  Images made from the data, however, can be used for any purpose.  Questions regarding data access should be directed to NOAA CoastWatch.";
    String time_coverage_end "2006-10-12T00:00:00Z";
    String time_coverage_start "1997-09-10T00:00:00Z";
    String title "Chlorophyll-a, Orbview-2 SeaWiFS, West US, 1997-2006, Science Quality (8 Day Composite) DEPRECATED";
    Float64 Westernmost_Easting 225.012;
  }
}

 

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://upwell.pfeg.noaa.gov/erddap/griddap/datasetID.fileType{?query}
For example,
https://upwell.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.


 
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