Global Bathymetry and Topography at 15 Arc Sec: SRTM15+
An updated global bathymetry and topography grid is presented using a spatial sampling interval of 15 arc sec. The bathymetry is produced using a combination of shipboard soundings and depths predicted using satellite altimetry. New data consists of >33.6 million multibeam and singlebeam measurem...
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ftdoajarticles:oai:doaj.org/article:95db1757cac2402aaa9c72408bdc82ed 2023-05-15T13:37:39+02:00 Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ B. Tozer D. T. Sandwell W. H. F. Smith C. Olson J. R. Beale P. Wessel 2019-10-01T00:00:00Z https://doi.org/10.1029/2019EA000658 https://doaj.org/article/95db1757cac2402aaa9c72408bdc82ed EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2019EA000658 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2019EA000658 https://doaj.org/article/95db1757cac2402aaa9c72408bdc82ed Earth and Space Science, Vol 6, Iss 10, Pp 1847-1864 (2019) global bathymetry altimetry marine free‐air gravity anomalies marine vertical gravity gradient digital elevation model Astronomy QB1-991 Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.1029/2019EA000658 2022-12-31T00:28:01Z An updated global bathymetry and topography grid is presented using a spatial sampling interval of 15 arc sec. The bathymetry is produced using a combination of shipboard soundings and depths predicted using satellite altimetry. New data consists of >33.6 million multibeam and singlebeam measurements collated by several institutions, namely, the National Geospatial‐Intelligence Agency, Japan Agency for Marine‐Earth Science and Technology, Geoscience Australia, Center for Coastal and Ocean Mapping, and Scripps Institution of Oceanography. New altimetry data consists of 48, 14, and 12 months of retracked range measurements from Cryosat‐2, SARAL/AltiKa, and Jason‐2, respectively. With respect to SRTM15_PLUS (Olson et al.,), the inclusion of these new data results in a ∼1.4‐km improvement in the minimum wavelength recovered for sea surface free‐air gravity anomalies, a small increase in the accuracy of altimetrically derived predicted depths, and a 1.24% increase, from 9.60% to 10.84%, in the total area of ocean floor that is constrained by shipboard soundings at 15‐arc sec resolution. Bathymetric grid cells constrained by satellite altimetry have estimated uncertainties of ±150 m in the deep oceans and ±180 m between coastlines and the continental rise. Onshore, topography data are sourced from previously published digital elevation models, predominately SRTM‐CGIAR V4.1 between 60°N and 60°S. ArcticDEM is used above 60°N, while Reference Elevation Model of Antarctica is used below 62°S. Auxiliary grids illustrating shipboard data coverage, marine free‐air gravity anomalies, and vertical gradient gradients are also provided in common data formats. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Scripps ENVELOPE(-63.783,-63.783,-69.150,-69.150) Earth and Space Science 6 10 1847 1864 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
global bathymetry altimetry marine free‐air gravity anomalies marine vertical gravity gradient digital elevation model Astronomy QB1-991 Geology QE1-996.5 |
spellingShingle |
global bathymetry altimetry marine free‐air gravity anomalies marine vertical gravity gradient digital elevation model Astronomy QB1-991 Geology QE1-996.5 B. Tozer D. T. Sandwell W. H. F. Smith C. Olson J. R. Beale P. Wessel Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ |
topic_facet |
global bathymetry altimetry marine free‐air gravity anomalies marine vertical gravity gradient digital elevation model Astronomy QB1-991 Geology QE1-996.5 |
description |
An updated global bathymetry and topography grid is presented using a spatial sampling interval of 15 arc sec. The bathymetry is produced using a combination of shipboard soundings and depths predicted using satellite altimetry. New data consists of >33.6 million multibeam and singlebeam measurements collated by several institutions, namely, the National Geospatial‐Intelligence Agency, Japan Agency for Marine‐Earth Science and Technology, Geoscience Australia, Center for Coastal and Ocean Mapping, and Scripps Institution of Oceanography. New altimetry data consists of 48, 14, and 12 months of retracked range measurements from Cryosat‐2, SARAL/AltiKa, and Jason‐2, respectively. With respect to SRTM15_PLUS (Olson et al.,), the inclusion of these new data results in a ∼1.4‐km improvement in the minimum wavelength recovered for sea surface free‐air gravity anomalies, a small increase in the accuracy of altimetrically derived predicted depths, and a 1.24% increase, from 9.60% to 10.84%, in the total area of ocean floor that is constrained by shipboard soundings at 15‐arc sec resolution. Bathymetric grid cells constrained by satellite altimetry have estimated uncertainties of ±150 m in the deep oceans and ±180 m between coastlines and the continental rise. Onshore, topography data are sourced from previously published digital elevation models, predominately SRTM‐CGIAR V4.1 between 60°N and 60°S. ArcticDEM is used above 60°N, while Reference Elevation Model of Antarctica is used below 62°S. Auxiliary grids illustrating shipboard data coverage, marine free‐air gravity anomalies, and vertical gradient gradients are also provided in common data formats. |
format |
Article in Journal/Newspaper |
author |
B. Tozer D. T. Sandwell W. H. F. Smith C. Olson J. R. Beale P. Wessel |
author_facet |
B. Tozer D. T. Sandwell W. H. F. Smith C. Olson J. R. Beale P. Wessel |
author_sort |
B. Tozer |
title |
Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ |
title_short |
Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ |
title_full |
Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ |
title_fullStr |
Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ |
title_full_unstemmed |
Global Bathymetry and Topography at 15 Arc Sec: SRTM15+ |
title_sort |
global bathymetry and topography at 15 arc sec: srtm15+ |
publisher |
American Geophysical Union (AGU) |
publishDate |
2019 |
url |
https://doi.org/10.1029/2019EA000658 https://doaj.org/article/95db1757cac2402aaa9c72408bdc82ed |
long_lat |
ENVELOPE(-63.783,-63.783,-69.150,-69.150) |
geographic |
Scripps |
geographic_facet |
Scripps |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Earth and Space Science, Vol 6, Iss 10, Pp 1847-1864 (2019) |
op_relation |
https://doi.org/10.1029/2019EA000658 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2019EA000658 https://doaj.org/article/95db1757cac2402aaa9c72408bdc82ed |
op_doi |
https://doi.org/10.1029/2019EA000658 |
container_title |
Earth and Space Science |
container_volume |
6 |
container_issue |
10 |
container_start_page |
1847 |
op_container_end_page |
1864 |
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1766095566293434368 |