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Dataset Title:  SRTM30_PLUS Estimated Topography, 30 seconds, Global, v11, Lon+/-180 Subscribe RSS
Institution:  SIO, NOAA, U.S. Navy, NGA, GEBCO   (Dataset ID: srtm30plus_LonPM180)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Make a graph
 
Dimensions ? Start ? Stride ? Stop ?  Size ?    Spacing ?
 latitude (degrees_north) ?      21600    0.008333333 (even)
  < slider >
 longitude (degrees_east) ?      43200    0.008333333 (even)
  < slider >
 
Grid Variables (which always also download all of the dimension variables)
 z (Altitude, m) ?

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 {
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -89.99583333333334, 89.99583333333334;
    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 -179.99583333333334, 179.99583333333334;
    String axis "X";
    String ioos_category "Location";
    String long_name "Longitude";
    String standard_name "longitude";
    String units "degrees_east";
  }
  z {
    Int16 _FillValue -32768;
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "Topography";
    String coordsys "geographic";
    String ioos_category "Location";
    String long_name "Altitude";
    String positive "up";
    String standard_name "altitude";
    String units "m";
  }
  NC_GLOBAL {
    String cdm_data_type "Grid";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "dsandwell@ucsd.edu";
    String creator_name "David T. Sandwell";
    String creator_type "person";
    String creator_url "http://topex.ucsd.edu/sandwell/";
    Float64 Easternmost_Easting 179.99583333333334;
    Float64 geospatial_lat_max 89.99583333333334;
    Float64 geospatial_lat_min -89.99583333333334;
    Float64 geospatial_lat_resolution 0.008333333333333333;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 179.99583333333334;
    Float64 geospatial_lon_min -179.99583333333334;
    Float64 geospatial_lon_resolution 0.008333333333333333;
    String geospatial_lon_units "degrees_east";
    String GMT_version "4.5.12 [64-bit]";
    String history 
"xyz2grd -V -Rg -I30c topo30 -Gtopo30.grd=ns -ZTLhw -F
2018-08-16T21:42:02Z ftp://topex.ucsd.edu/pub/srtm30_plus/topo30.grd
2018-08-16T21:42:02Z http://upwell.pfeg.noaa.gov/erddap/griddap/srtm30plus_LonPM180.das";
    String infoUrl "http://topex.ucsd.edu/WWW_html/srtm30_plus.html";
    String institution "SIO, NOAA, U.S. Navy, NGA, GEBCO";
    String keywords "altitude, bathymetry, Becker, data, DEM, elevation, estimated, global, GMT, Sandwell, seconds, Smith, topex, topo30, topography, ucsd, v11";
    String license 
"David T. Sandwell, Joseph J. Becker, and Walter H. F. Smith.
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 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 & 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.";
    Int32 node_offset 1;
    Float64 Northernmost_Northing 89.99583333333334;
    String references 
"Reference, sounding data: 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, R. Trimmer, J. Von Rosenberg, G. Wallace, P. Weatherall., Global Bathymetry and Elevation Data at 30 Arc Seconds Resolution: SRTM30_PLUS, Marine Geodesy, 32:4, 355-371, 2009.

Reference, gravity data: Sandwell, D. T., R. D. Müller, W. H. F. Smith, E. Garcia, R. Francis, New global marine gravity model from CryoSat-2 and Jason-1 reveals buried tectonic structure, Science, Vol. 346, no. 6205, pp. 65-67, doi: 10.1126/science.1258213, 2014.";
    String sourceUrl "ftp://topex.ucsd.edu/pub/srtm30_plus/topo30.grd";
    Float64 Southernmost_Northing -89.99583333333334;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary 
"One GMT file, topo30.grd, with the entire global topography. The grid resolution is 30 seconds which is roughly 0.55km at the equator.  The data are pixel registered.

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 (https://www2.jpl.nasa.gov/srtm/). GTOPO30 data (http://www1.gsi.go.jp/geowww/globalmap-gsi/gtopo30/gtopo30.html) are used for high latitudes where SRTM data are not available.

Ocean data are based on the Smith and Sandwell global 1-minute grid (http://topex.ucsd.edu/WWW_html/mar_topo.html) between latitudes +/-81 degrees. Higher resolution grids have been added from the LDEO Ridge Multibeam Synthesis Project (http://www.marine-geo.org/portals/gmrt/), the JAMSTEC Data Site for Research Cruises (https://www.godac.jamstec.go.jp/darwin/e), and the NGDC Coastal Relief Model (https://www.ngdc.noaa.gov/mgg/coastal/coastal.html). Arctic bathymetry is from the International Bathymetric Chart of the Oceans (IBCAO) (https://www.ngdc.noaa.gov/mgg/bathymetry/arctic/arctic.html) [Jakobsson et al., 2003].

Matching files of source identification number are available for determining the data source for every pixel.";
    String title "SRTM30_PLUS Estimated Topography, 30 seconds, Global, v11, Lon+/-180";
    Float64 Westernmost_Easting -179.99583333333334;
  }
}

 

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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