279:(California). The version 15_PLUS comes at 0.25 arc-min resolution (about 450 m postings), while the 30_PLUS version offers 0.5 arc-min (900 m) resolution. The bathymetric data in SRTM30_PLUS stems from depth soundings (SONAR) and from satellite altimetry. The bathymetric component of SRTM30_PLUS gets regularly updated with new or improved data sets in order to continuously improve and refine the description of the sea floor geometry. Over land areas, SRTM30 data from the USGS is included. SRTM30_PLUS provides background information for
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about 1.8 km postings). Some products such as the 30 and 15 arc-second resolution SRTM30_PLUS/ SRTM15_PLUS grids offer higher resolution to adequately represent SONAR depth measurements where available. Although grid cells are spaced at 15 or 30 arc-seconds, when SONAR measurements are unavailable, the resolution is much worse (~20-12 km) depending on factors such as water depth.
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missions), the global bathymetry (e.g., SRTM30_PLUS) is known to a much lesser spatial resolution in the kilometre-range. The same holds true for models of the bedrock of
Antarctica and Greenland. Therefore, global relief models are often constructed at 1 arc-minute resolution (corresponding to
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The Earth2014 global relief model, developed at Curtin
University (Western Australia) and TU Munich (Germany). Earth2014 provides sets of 1 arc-min resolution global grids (about 1.8 km postings) of Earth's relief in different representations based on the 2013 releases of bedrock and ice-sheet data
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Earth2014 provides five different layers of height data, including Earth's surface (lower interface of the atmosphere), topography and bathymetry of the oceans and major lakes, topography, bathymetry and bedrock, ice-sheet thicknesses and rock-equivalent topography. The Earth2014 global grids are
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The ETOPO1 global relief model is based on the 2001 Bedmap1 model of bedrock over
Antarctica, which is now superseded by the significantly improved Bedmap2 bedrock data. The ETOPO1-contained information on ocean depths is superseded through several updates of the SRTM30_PLUS bathymetry.
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over the oceans and some of Earth's major lakes. ETOPO1 land topography and ocean bathymetry relies on SRTM30 topography and a multitude of bathymetric surveys that have been merged. Historic versions of ETOPO1 are the ETOPO2 and ETOPO5 relief models (2 and 5 arc-min resolution).
299:(Colorado), provides two layers of relief information. One layer represents the global relief including bedrock over Antarctica and Greenland, and another layer the global relief including ice surface heights. Both layers include
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techniques. This is because there is no single remote sensing technique that would allow measurement of the relief both over dry and water-covered areas. Elevation data over land is often obtained from
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model (DBM) data over water-covered areas (oceans, lakes) to describe Earth's relief. A relief model thus shows how Earth's surface would look like in the absence of water or ice masses.
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Four different topography layers of the Earth2014 model. Clockwise from top left: (1) Earth's surface, (2) bedrock, (3) rock-equivalent topography, (4) bathymetry and ice surface
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Example of a global relief model: Earth2014 bedrock layer (topography over land, bathymetry over oceans and major lakes, sub-ice-topography over ice-shields)
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over
Antarctica (Bedmap2) and Greenland (Greenland Bedrock Topography), the 2013 SRTM_30PLUS bathymetry and 2008 SRTM V4.1 SRTM land topography.
352:"Earth2014: 1 arc-min shape, topography, bedrock and ice-sheet models - available as gridded data and degree-10,800 spherical harmonics"
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The 2022 ETOPO version is the most recent global relief model with several scans at 1 arc-min, 30 arc-sec, and 15 arc-sec resolutions.
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Sandwell, D.; et al. (2014). "New global marine gravity model from CryoSat-2 and Jason-1 reveals buried tectonic structure".
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The relief is represented by a set of heights (elevations or depths) that refer to some height reference surface, often the mean
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for the conventional relief model, and as planetary radii relative to the centre of Earth to show the shape of the Earth.
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While digital elevation models describe Earth's land topography often with 1 to 3 arc-second resolution (e.g., from the
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Amante, C.; Eakins, B.W. (2009). "ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data
Sources and Analysis".
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Data sets produced and released to the public include Earth2014, SRTM30_PLUS and ETOPO1.
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and altimetry. Global relief models may also contain elevations of the bedrock (sub-ice-
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Please help update this article to reflect recent events or newly available information.
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Global relief models are always based on combinations of data sets from different
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of Earth without liquid water but with ice, with 20× elevation exaggeration
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SRTM30_PLUS is a combined bathymetry and topography model produced by
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International
Journal of Applied Earth Observation and Geoinformation
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Model of Earth's relief including elevation and depth underwater
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The ETOPO1 1-arcmin global relief model, produced by the
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131:Measurement
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312:References
301:bathymetry
201:ETOPO 2022
162:Antarctica
158:topography
150:bathymetry
123:analyses,
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