Data Access Form

Dataset Title:	Topography, ETOPO2v2g, 0.033333 degrees, Global (longitude -180 to 180)
Dataset ID:	etopo180
Institution:	NOAA NGDC
Information:	Summary \| Variables \| Background \| Make A Graph

Dimensions	Size	Spacing
latitude (degrees_north)	5401	0.03333333 (even)

longitude (degrees_east)	10801	0.03333333 (even)

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

File type:

The Dataset Attribute Structure (.das) for this Dataset

Attributes {
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -90.0, 90.0;
    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 -180.0, 180.0;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  altitude {
    Int16 _FillValue 32767;
    Int16 actual_range -5527, 4064;
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "Topography";
    String coordsys "geographic";
    String ioos_category "Location";
    String long_name "Altitude";
    Int16 missing_value 32767;
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  NC_GLOBAL {
    String acknowledgement "NOAA NGDC";
    String cdm_data_type "Grid";
    String contributor_name 
"Smith & Sandwell, GLOBE, IBCAO, NGDC Coastal Relief Model (CRM), NGDC Great 
Lakes Bathymetric Data, and Caspian Sea Bathymetry";
    String contributor_role "source data";
    String Conventions "COARDS, CF-1.0, Unidata Dataset Discovery v1.0";
    String creator_email "david.c.schoolcraft@noaa.gov";
    String creator_name "NOAA NGDC";
    String creator_url "http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html";
    String data_source "NOAA NGDC ETOPO2v2g_MSB.raw";
    String history 
"Sampled from http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/
ETOPO2v2g/raw_binary/ETOPO2v2g_i2_MSB.zip
2009-11-24 http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/
ETOPO2v2g/raw_binary/ETOPO2v2g_i2_MSB.zip
2009-11-24 http://coastwatch.pfeg.noaa.gov/erddap/griddap/etopo180.das";
    String id "SampledFromETOPO2v2g_MSB.raw";
    String infoUrl "http://www.ngdc.noaa.gov/mgg/fliers/01mgg04.html";
    String institution "NOAA NGDC";
    String keywords "EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry";
    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.pfel.coastwatch";
    String project "NOAA NGDC ETOPO";
    String projection "geographic";
    String projection_type "mapped";
    String references 
"U.S. Department of Commerce, National Oceanic and Atmospheric 
Administration, National Geophysical Data Center, 2006. 2-minute Gridded 
Global Relief Data (ETOPO2v2)";
    String sourceUrl 
"http://www.ngdc.noaa.gov/mgg/global/relief/ETOPO2/ETOPO2v2-2006/ETOPO2v2g/
raw_binary/ETOPO2v2g_i2_MSB.zip";
    String standard_name_vocabulary "CF-11";
    String summary 
"Two-minute gridded global relief for both ocean and land areas are available 
in the ETOPO2v2 (2006) database. The horizontal datum is WGS-84, the 
vertical datum is Mean Sea Level. ETOPO2v2 is a compilation of several 
datasets: Smith & Sandwell, GLOBE, IBCAO, NGDC Coastal Relief Model (CRM), 
NGDC Great Lakes Bathymetric Data, and Caspian Sea Bathymetry. Keywords: 
Bathymetry, Digital Elevation. This is the grid-centered version, with cell 
boundaries defined by lines of odd minutes of latitude and longitude, 
meaning that cells were centered on the integer multiples of 2 minutes [even 
minutes] of latitude and longitude.";
    String title "Topography, ETOPO2v2g, 0.033333 degrees, Global (longitude -180 to 180)";
  }
}

Using griddap to Request Data and Graphs from Gridded Datasets

griddap lets you request gridded data (for example, environmental data from satellites) and graphs of gridded data, via specially formed URLs.
The URLs specify everything: the dataset, the desired file type for the response, and the subset of data that you want to receive.
You can form these URLs by hand or with a computer program,
or (much easier) you can use the dataset's "Data Access Form" (oriented to requests for data)
or the dataset's "Make A Graph" form (oriented to requests for graphs and maps),
both of which generate the URL when the form is submitted.
griddap is a superset of the OPeNDAP DAP hyperslab protocol.

griddap request URLs must be in the form
http://coastwatch.pfeg.noaa.gov/erddap/griddap/ datasetID fileType {?query}
For example,
http://coastwatch.pfeg.noaa.gov/erddap/griddap/erdBAssta5day.htmlTable?sst[(2007-10-21T00:00:00)][0][(-75):100:(75)][(180):100:(360)]

For details, see the griddap Documentation.

ERDDAP Version 1.22

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