Data Access Form

Dataset Title:	Topography, SRTM30+ Version 6.0, 30 arc second, Global
Institution:	Scripps (Dataset ID: usgsCeSrtm30v6)
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Make a graph

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Dimensions	Size	Spacing
latitude (degrees_north)	21600	-0.008333333 (even)

longitude (degrees_east)	43200	0.008333333 (even)

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

topo (Topography, meters)

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 {
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.99166666666667, 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, 179.99166666666667;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  topo {
    Int16 _FillValue -9999;
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "Topography";
    String grid_mapping "GDAL_Geographics";
    String ioos_category "Location";
    String long_name "Topography";
    String standard_name "altitude";
    String units "meters";
  }
  NC_GLOBAL {
    String AREA_OR_POINT "Area";
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "jjbecker@ucsd.edu, dsandwell@ucsd.edu";
    Float64 Easternmost_Easting 179.99166666666667;
    Float64 geospatial_lat_max 90.0;
    Float64 geospatial_lat_min -89.99166666666667;
    Float64 geospatial_lat_resolution 0.008333333333333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.99166666666667;
    Float64 geospatial_lon_min -180.0;
    Float64 geospatial_lon_resolution 0.008333333333333333;
    String geospatial_lon_units "degrees_east";
    String history 
"2023-06-04T10:35:24Z https://geoport.whoi.edu/thredds/dodsC/bathy/srtm30plus_v6
2023-06-04T10:35:24Z http://coastwatch.pfeg.noaa.gov/erddap/griddap/usgsCeSrtm30v6.das";
    String infoUrl "https://topex.ucsd.edu/WWW_html/srtm30_plus.html";
    String institution "Scripps";
    String keywords "altitude, arc, atmosphere, Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry, global, height, scripps, second, srtm30+, station, topography, version";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "David T. Sandwell, Walter H. F. Smith, and Joseph J. Becker Copyright 2009. The Regents of the University of California. All Rights Reserved. Permission to copy, modify and distribute any part of this gridded bathymetry at 30 second resolution for educational, research and non-profit purposes, without fee, and without a written agreement is hereby granted, provided that the above copyright notice, this paragraph and the following three paragraphs appear in all copies. Those desiring to incorporate this global bathymetry into commercial products or use for commercial purposes should contact the Technology Transfer and Intellectual Property Services, University of California, San Diego, 9500 Gilman Drive, Mail Code 0910, La Jolla, CA 92093-0910, Ph: (858) 534-5815, FAX: (858) 534-7345, E-MAIL:invent@ucsd.edu. IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS global bathymetry, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE global bathymetry PROVIDED HEREIN IS ON AN \"AS IS\" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. THE UNIVERSITY OF CALIFORNIA MAKES NO REPRESENTATIONS AND EXTENDS NO WARRANTIES OF ANY KIND, EITHER IMPLIED OR EXPRESS, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR THAT THE USE OF THE global bathymetry WILL NOT INFRINGE ANY PATENT, TRADEMARK OR OTHER RIGHTS.";
    String naming_authority "gov.noaa.pfeg.coastwatch";
    Float64 Northernmost_Northing 90.0;
    String references "Becker, J. J., D. T. Sandwell, W. H. F. Smith, J. Braud, B. Binder, J. Depner, D. Fabre, J. Factor, S. Ingalls, S-H. Kim, R. Ladner, K. Marks, S. Nelson, A. Pharaoh, G. Sharman, R. Trimmer, J. vonRosenburg, G. Wallace, P. Weatherall., Global Bathymetry and Elevation Data at 30 Arc Seconds Resolution: SRTM30_PLUS, revised for Marine Geodesy, January 20, 2009";
    String sourceUrl "https://geoport.whoi.edu/thredds/dodsC/bathy/srtm30plus_v6";
    Float64 Southernmost_Northing -89.99166666666667;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String summary 
"This is global topography data. The grid resolution is 30 seconds which is roughly one kilometer.

Land data are based on the 1-km averages of topography derived from the USGS SRTM30 grided DEM data product created with data from the NASA Shuttle Radar Topography Mission. GTOPO30 data are used for high latitudes where SRTM data are not available.

Ocean data are based on the Smith and Sandwell global 1-minute grid between latitudes +/- 81 degrees. Higher resolution grids have been added from the LDEO Ridge Multibeam Synthesis Project, the JAMSTEC Data Site for Research Cruises, and the NGDC Coastal Relief Model. Arctic bathymetry is from the International Bathymetric Chart of the Oceans (IBCAO) [Jakobsson et al., 2003].";
    String title "Topography, SRTM30+ Version 6.0, 30 arc second, Global";
    Float64 Westernmost_Easting -180.0;
  }
}

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.