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Dataset Title:  Global Drifter Program - Climatology - Current Variance Subscribe RSS
Institution:  NOAA/AOML & Univ. Miami   (Dataset ID: drifter_currentvariance)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 longitude (degrees_east) ?      1440    0.25 (even)
  < slider >
 latitude (degrees_north) ?      632    0.25 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables) 
 Up2bar (Zonal Velocity Variance, mean(u-prime-squared), (meters per second)^2) ?
 Vp2bar (Meridional Velocity Variance, mean(v-prime-squared), (meters per second)^2) ?
 rA (Variance Ellipse semimajor axis, (meters per second)^2) ?
 rB (Variance Ellipse semiminor axis, (meters per second)^2) ?
 angle (degrees: 0=east/west, 45=northeast/southwest, 90=north/south) ?
 N (Number of drifter-days per square degree, drifter-days per square degree) ?

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 {
  longitude {
    UInt32 _ChunkSizes 1440;
    String _CoordinateAxisType "Lon";
    Float64 actual_range -179.875, 179.875;
    String axis "X";
    String coordinates "Lat";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
    Float64 valid_max 179.875;
    Float64 valid_min -179.875;
  }
  latitude {
    UInt32 _ChunkSizes 632;
    String _CoordinateAxisType "Lat";
    Float64 actual_range -72.875, 84.875;
    String axis "Y";
    String coordinates "Lat";
    String ioos_category "Location";
    String long_name "Latitude";
    String standard_name "latitude";
    String units "degrees_north";
    Float64 valid_max 84.875;
    Float64 valid_min -72.875;
  }
  Up2bar {
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum 0.0;
    String long_name "Zonal Velocity Variance, mean(u-prime-squared)";
    String units "(meters per second)^2";
    Float64 valid_max 0.47488;
    Float64 valid_min 3.5059e-4;
  }
  Vp2bar {
    Float64 colorBarMaximum 0.4;
    Float64 colorBarMinimum 0.0;
    String long_name "Meridional Velocity Variance, mean(v-prime-squared)";
    String units "(meters per second)^2";
    Float64 valid_max 0.38285;
    Float64 valid_min 3.563e-4;
  }
  rA {
    Float64 colorBarMaximum 0.5;
    Float64 colorBarMinimum 0.0;
    String long_name "Variance Ellipse semimajor axis";
    String units "(meters per second)^2";
    Float64 valid_max 0.4554;
    Float64 valid_min 5.1876e-4;
  }
  rB {
    Float64 colorBarMaximum 0.35;
    Float64 colorBarMinimum 0.0;
    String long_name "Variance Ellipse semiminor axis";
    String units "(meters per second)^2";
    Float64 valid_max 0.32858;
    Float64 valid_min 2.4296e-4;
  }
  angle {
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String long_name "Orientation Angle of Variance Ellipse";
    String units "degrees: 0=east/west, 45=northeast/southwest, 90=north/south";
    Float64 valid_max 89.9995;
    Float64 valid_min -89.9998;
  }
  N {
    Float64 colorBarMaximum 2000.0;
    Float64 colorBarMinimum 0.0;
    String long_name "Number of drifter-days per square degree";
    String units "drifter-days per square degree";
    Float64 valid_max 1712.8255;
    Float64 valid_min 13.0507;
  }
  NC_GLOBAL {
    String author "Laurindo, Mariano, and Lumpkin (2017), Deep-Sea Res. I, doi:10.1016/j.dsr.2017.04.009";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.10, ACDD-1.3";
    String creator_email "aoml.webmaster@noaa.gov";
    String creator_name "NOAA/AOML & Univ. Miami";
    String creator_type "institution";
    String creator_url "https://www.aoml.noaa.gov/";
    String datadate "Climatology uses data through 28-Feb-2023";
    String date2 "File created 21-Aug-2023 09:38:21";
    String description "Surface Current Variance from Drifter Data";
    Float64 Easternmost_Easting 179.875;
    Float64 geospatial_lat_max 84.875;
    Float64 geospatial_lat_min -72.875;
    Float64 geospatial_lat_resolution 0.25;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.875;
    Float64 geospatial_lon_min -179.875;
    Float64 geospatial_lon_resolution 0.25;
    String geospatial_lon_units "degrees_east";
    String history 
"2024-07-15T20:02:18Z (local files)
2024-07-15T20:02:18Z https://erddap.aoml.noaa.gov/gdp/erddap/griddap/drifter_currentvariance.das";
    String infoUrl "https://www.aoml.noaa.gov/";
    String institution "NOAA/AOML & Univ. Miami";
    String keywords "angle, aoml, atlantic, axis, data, days, degree, drifter, drifter-days, ellipse, laboratory, latitude, longitude, mean, meridional, meteorological, miami, noaa, number, oceanographic, orientation, per, prime, semimajor, semiminor, square, squared, u-prime-squared, university, Up2bar, v-prime-squared, variance, velocity, Vp2bar, zonal";
    String license "Creative Commons Attribution 4.0 (https://creativecommons.org/licenses/by/4.0/) This study used data collected and made freely available by the NOAA Global Drifter Program (https://www.aoml.noaa.gov/phod/gdp/) accessed from https://erddap.aoml.noaa.gov/gdp/erddap/index.html";
    Float64 Northernmost_Northing 84.875;
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -72.875;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary "Current variance (eddy kinetic energy) derived from residuals with respect to the time-mean, seasonal, spatial gradient, and SOI-related currents";
    String title "Global Drifter Program - Climatology - Current Variance";
    String version "3.10";
    Float64 Westernmost_Easting -179.875;
  }
}

 

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://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.


 
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