GIS Data

USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps.

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January 1, 1990

Map showing free-air gravity anomalies around the Canary Islands, Spain Map showing free-air gravity anomalies around the Canary Islands, Spain

No abstract available.

January 1, 1990

Map showing free-air gravity anomalies around the Cape Verde Islands Map showing free-air gravity anomalies around the Cape Verde Islands

No abstract available.

January 1, 1990

Map showing free-air gravity anomalies off the southern coast of west-central Africa Liberia to Ghana Map showing free-air gravity anomalies off the southern coast of west-central Africa Liberia to Ghana

No abstract available.

January 1, 1990

Map showing free-air gravity anomalies off the western coast of Africa Nigeria to Gabon Map showing free-air gravity anomalies off the western coast of Africa Nigeria to Gabon

No abstract available.

January 1, 1990

Map showing free-air gravity anomalies off the western coast of Africa Senegal (south of 15° north latitude) to Sierra Leone Map showing free-air gravity anomalies off the western coast of Africa Senegal (south of 15° north latitude) to Sierra Leone

This map is one of six in a series presenting marine gravity data off the western coast of Africa (fig. 1). The data, collected by the U.S. Geological Survey (USGS) in 1987 in response to a request from the Defense Mapping Agency, are intended to improve gravity coverage where it has been insufficient or inadequate. The information shown on this and the other three maps that cover the...

January 1, 1990

Map showing free-air gravity anomalies off the western coast of Africa Western Sahara to Senegal (north of 15 north latitude) Map showing free-air gravity anomalies off the western coast of Africa Western Sahara to Senegal (north of 15 north latitude)

No abstract available.