SRTM15_PLUS Estimated Topography, 15 seconds, Global, v1

One GMT file, topo15.grd, with the entire global topography. The grid resolution is 15 seconds which is roughly 0.27km 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 (https://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 ( https://www.gmrt.org/ ), 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.

Data and Resources

Field Value
access_constraints []
bbox-east-long 180.0
bbox-north-lat 90.0
bbox-south-lat -90.0
bbox-west-long -180.0
contact-email dsandwell@ucsd.edu
coupled-resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
dataset-reference-date [{"type": "creation", "value": "2022-08-23"}]
guid srtm15plus
licence []
lineage grdconvert topo15.grd topo15_compressed.nc=ns (old cmd) grdmath -V -fg /geosat2/srtm15_data/land//land.grd /geosat2/srtm15_data/topo//debug/polished.grd AND = /geosat2/srtm15_data/topo//world.grd
metadata-date 2022-08-23
metadata-language eng
metadata_type geospatial
old-spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
resource-type dataset
responsible-party [{"name": "SIO, NOAA, U.S. Navy, NGA, GEBCO", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [180.0, -90.0], [180.0, 90.0], [-180.0, 90.0], [-180.0, -90.0]]]}
spatial-data-service-type ERDDAP griddap
spatial_harvester true
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • altitude
  • bathymetry
  • becker
  • data
  • dem
  • elevation
  • estimated
  • gebco
  • global
  • gmt
  • latitude
  • longitude
  • nga
  • noaa
  • sandwell
  • seconds
  • sio
  • smith
  • topex
  • topo15
  • topography
  • u.s. navy
  • ucsd
  • v11
isopen False
metadata_created 2025-09-25T01:01:06.646494
metadata_modified 2025-09-25T01:01:06.646505
notes One GMT file, topo15.grd, with the entire global topography. The grid resolution is 15 seconds which is roughly 0.27km 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 (https://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 ( https://www.gmrt.org/ ), 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.
num_resources 10
num_tags 32
title SRTM15_PLUS Estimated Topography, 15 seconds, Global, v1