Digital Maps of Proterozoic Rocks in Western Saudi Arabia - Meta-Data, Kingdom Of Saudi Arabia
Peter R. Johnson
This report provides background information about three sets of digital geologic maps covering the Proterozoic rocks of western Saudi Arabia. The maps differ in scale and degree of detail. • The most detailed set of maps were compiled at a scale of 1:500,000 and are intended for use at scales between 1:500,000 and 1:1million. They are referred to here as the primary maps, and are available as (1) 6 separate sheets with accompanying explanatory notes that cover different parts of the shield; (2) a single, composite digital map covering the entire shield; and (3) 7 sheets systematically covering the shield that are derived from the composite map.
- The second type of map is a derivative map, prepared by slightly simplifying the primary map. It is intended for use at scales between 1:1 million and 1:2 million.
- The third type of map is likewise a derivative map. It was prepared by significantly simplifying the primary map, and is intended for use at scales smaller than 1:2 million.
The digital maps are the outcome of a 12-year program of map recompilation, reinterpretation, and digitization of previous geologic maps modified in the light of new structural observations, Thematic Mapper interpretations, and new geochronology, as well as by the impact of current tectonic analysis of the Arabian shield. The digital data consist of ArcGIS shape files that make up polygons, which represent geologic units, and arcs (lines), which represent (1) faults and contacts and (2) dikes. The attribute tables associated with these shape files allow interrogation of the data and the development of derivative maps for GIS applications.
Johnson, P., 2006, Digital maps of Proterozoic rocks in western Saudi Arabia - Meta-Data, Kingdom of Saudi Arabia: Saudi Geological Survey Data-File Report SGS-DF-2005-7, 22 p., 2 figs., 3 aps.