Asia Pacific Map - Open File Report 97-470F

MAPS SHOWING GEOLOGY, OIL AND GAS FIELDS, AND GEOLOGIC PROVINCES OF THE ASIA PACIFIC REGION
Compiled by
Douglas W. Steinshouer, Jin Qiang, Peter J. McCabe, and Robert T. Ryder

Open-File Report 97-470F

DATA PROCESSING STEPS

The maps on this CD were digitally compiled and abstracted from the following maps:
Geological Map of South and East Asia, Third Edition, 1990 A. Ghose, D. Chatterjee, and J. Banerjee,
UNESCO, Commission for Geological Map of the World, Subcommission for South and East Asia
Scale 1:5,000,000

Geological Map of the World: Australia and Oceania, Sheets 6,7,11, and 12, 1965
Bureau of Mineral Resources (now Australian Geological Survey Organisation)
Scale 1:5,000,000

Geological Map of the World: Australia and Oceania, Sheets 2, 3, and 8, 1967
Bureau of Mineral Resources (now Australian Geological Survey Organisation)
Scale 1:5,000,000

Geological Map of the World: Australia and Oceania, Sheets 9 and 13, 1971
New Zealand Geological Survey (Institute of Geological and Nuclear Sciences, Limited)
Scale 1:5,000,000

The following process steps were taken:
1. Gray-scale scanned images of the source maps were registered and rectified in Arc/Info. In the case of the UNESCO maps, they were registered to a composite of Arcworld country boundaries (shorelines) and Arcworld water bodies projected to a Lambert projection with standard parallels of 40 and 10 degrees North, and a central meridian of 70 degrees East, with an average root mean square error of 600 meters. In the case of the Australia and New Zealand maps they were registered to a grid of latitude and longitude lines generated as an arc coverage in Arc/Info and projected to the appropriate Lambert parameters for each map sheet, with an average root mean square error of 350 meters.

3. Geologic contacts were then digitized on screen in Arcedit using the scanned gray-scale images as a backdrop. Labels were applied and attributed as the linework was digitized using special AML menus and scripts. In the case of Australia and New Zealand, the coverage being digitized was re-projected to match the projection of each source map sheet. The original geologic attribution was generalized using reselect and calculate functions in Arcedit.

4. Because of contradictions in compilation, the digitized coverages were then transformed with a series of piece wise "rubber sheet" adjustments. The composite Arcworld coverage was used for transformation because it is derived from a readily obtainable standard compiled on a worldwide basis.

5. The coverages comprising the three plates of this Open-File Report were projected to optimal Lambert projections for these particular geographic regions.

6. The map sheets were produced in Arcplot using AML scripts. The geologic legend was generated as a separate graphic file in Arcplot. The Adobe Portable Document Format was created with postscript files generated in Arcplot.

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U.S. Department of the Interior \| U.S. Geological Survey URL: <http://pubs.usgs.gov/of/1997/ofr-97-470/OF97-470F/process.html> Contact: Energy Program Inquiries Questions or Assistance: GS Pubs Web Contact Page Last Modified: Mon Jul 19 10:29 EDT 2004

U. S. Geological Survey Open-File Report 97-470F