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  • Added 15 Sep 2016
  • Updated 30 Aug 2018

Ocean sediment thickness contours in 200 meter intervals for water depths ranging from 0 – 18,000 meters. These contours were derived from a global sediment thickness grid distributed by the National Geophysical Data Center (NGDC). The NGDC grid was compiled from various existing sediment thickness maps and drilling cores, and has a cell resolution of 5 arc seconds. Sediment thickness data is typically acquired through two methods. Seismic (or sub-bottom) profile technologies rely on powerful pulses of low-frequency sound which penetrate the substrate and return information about substrate thickness, character, and stratification. The data are collected along transect lines and require interpolation to create comprehensive maps. Sediment thickness is also determined by direct measurement through coring, which provides more detailed information but only at discrete sites. Coring data can also be interpolated to form area maps, and to help interpret the seismic data.

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RegionsNorth America, South America, Cabo Verde, Kiribati

Technical Details

Layer ID 20880
Data type Vector multilinestring
Feature count 5583
Attributes Depth, Id, Contour
Services Vector Query API


Added 15 Sep 2016 ago
Last checked 1 Sep 2018 ago
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