Data Access Form

Dataset Title:	Currents, Geostrophic, Aviso, 0.25 degrees, Global, 1992-2009 (Monthly Composite)
Institution:	NOAA NMFS SWFSC ERD (Dataset ID: erdTAgeomday)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Files \| Make a graph

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Dimensions	Size	Spacing
time (Centered Time, UTC)	201	30 days 10h 22m 48s (uneven)

altitude (m)	1	(just one value)

latitude (degrees_north)	600	0.25 (even)

longitude (degrees_east)	1440	0.25 (even)

Grid Variables (which always also download all of the dimension variables)

u_current (Eastward Sea Water Velocity, m s-1)

v_current (Northward Sea Water Velocity, m s-1)

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 7.192368e+8, 1.2451104e+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 -74.875, 74.875;
    String axis "Y";
    String coordsys "geographic";
    Int32 fraction_digits 4;
    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 0.125, 359.875;
    String axis "X";
    String coordsys "geographic";
    Int32 fraction_digits 4;
    String ioos_category "Location";
    String long_name "Longitude";
    String point_spacing "even";
    String standard_name "longitude";
    String units "degrees_east";
  }
  u_current {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordsys "geographic";
    Int32 fraction_digits 4;
    String ioos_category "Currents";
    String long_name "Eastward Sea Water Velocity";
    Float32 missing_value -9999999.0;
    String standard_name "eastward_sea_water_velocity";
    String units "m s-1";
  }
  v_current {
    Float32 _FillValue -9999999.0;
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum -0.5;
    String coordsys "geographic";
    Int32 fraction_digits 4;
    String ioos_category "Currents";
    String long_name "Northward Sea Water Velocity";
    Float32 missing_value -9999999.0;
    String standard_name "northward_sea_water_velocity";
    String units "m s-1";
  }
  NC_GLOBAL {
    String acknowledgement "NOAA NESDIS COASTWATCH, NOAA SWFSC ERD";
    String cdm_data_type "Grid";
    String composite "true";
    String contributor_name "Aviso";
    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 "2010-06-11";
    String date_issued "2010-06-11";
    String defaultGraphQuery "u_current[last][][][],v_current[last][][][]&.draw=vectors&.vars=longitude|latitude|u_current|v_current";
    Float64 Easternmost_Easting 359.875;
    Float64 geospatial_lat_max 74.875;
    Float64 geospatial_lat_min -74.875;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 359.875;
    Float64 geospatial_lon_min 0.125;
    Float64 geospatial_lon_resolution 0.25;
    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 
"Aviso
2010-06-11T10:53:00Z NOAA CoastWatch (West Coast Node) and NOAA SFSC ERD
2024-11-05T00:05:12Z (local files)
2024-11-05T00:05:12Z https://coastwatch.pfeg.noaa.gov/erddap/griddap/erdTAgeomday.das";
    String infoUrl "https://coastwatch.pfeg.noaa.gov/infog/TA_ugeo_las.html";
    String institution "NOAA NMFS SWFSC ERD";
    String keywords "altitude, archiving, aviso, circulation, coast, coastwatch, currents, data, degrees, Earth Science > Oceans > Ocean Circulation > Ocean Currents, eastward, eastward_sea_water_velocity, geostrophic, global, height, interpretation, noaa, node, ocean, oceanography, oceans, satellite, sea, seawater, ssh, surface, TAugeo, time, validation, velocity, water, wcn, west, zonal";
    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 naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 74.875;
    String origin "Aviso";
    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 "Aviso: https://www.aviso.altimetry.fr/en/my-aviso.html .";
    String satellite "TOPEX/Poseidon, ERS-1, ERS-2, Geosat Follow-On, Envisat, Jason-1";
    String sensor "Altimeter";
    String source "satellite observation: TOPEX/Poseidon, ERS-1, ERS-2, Geosat Follow-On, Envisat, Jason-1, Altimeter";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -74.875;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Aviso Zonal Geostrophic Current is inferred from Sea Surface Height Deviation, climatological dynamic height, and basic fluid mechanics.";
    String time_coverage_end "2009-06-16T00:00:00Z";
    String time_coverage_start "1992-10-16T12:00:00Z";
    String title "Currents, Geostrophic, Aviso, 0.25 degrees, Global, 1992-2009 (Monthly Composite)";
    Float64 Westernmost_Easting 0.125;
  }
}

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.