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ESRI Arc/Info Export | 1998-10-15 | 1.9 KB | 46 lines |
- EXP 0 /ACCOUNTS2/FPERSITS/RUS_GEO/TEXT_UX/SOURCE.E00
- ASC 2
- This map has been digitally compiled and abstracted from!lin;
- the Geological Map of the USSR,1966,!lin;
- D. V. Nalivkin, editor!lin;
- Ministry of Geology of the USSR!lin;
- Vsesoyuzniy Nauchno-Issledovatel'skiy!lin;
- Geologicheskiy Institute (VSEGEI).!lin;
- Sheets 1,2!lin;
- Scale 1:7,500,000.!lin;
- !lin;
- The projection and coordinate system for the original map were not given.!lin;
- It was necessary to georeference the map to real world coordinates.!lin;
- This was done as follows:!lin;
- !lin;
- 1. The latitude/longitude grid with cell size 4 * 6 degrees was projected!lin;
- to Equidistant Conic projection and then used to create ARC/INFO point !lin;
- coverage. That point coverage was used to create "to - from" links by
- ARC/INFO!lin;
- CONTROLPOINTS program.!lin;
- !lin;
- 2. A gray-scale scanned image of the original paper map was transformed to !lin
- Equidistant Conic projection by ARC/INFO GRIDWARP program (polynomial of the!lin
- second order) using the "to - from" links created by CONTROLPOINTS program.!lin;
- !lin;
- 3. The scanned image from the second step was vectorized by the method of!lin;
- extraction of linear features described by F.Persits, 1997, (USGS open-file!lin;
- report OF-97-713), and then corrected by hands-on digitization.!lin;
- !lin;
- 4. A series of piecewise "rubbersheet" transformations applied!lin;
- to the final ARC/INFO coverage. The ARC/INFO coverages that were used!lin;
- for transformation were ESRI's ArcWorld 1:3M GIS cartographic layers!lin;
- (RIV3M, CTRY3M).!lin;
- The same data have been used to draw boundaries of the newly independent!lin;
- states with permission of ESRI (1998).!lin;
- !lin;
- Petroleum field locations Centerpoints are published here from 1996 data
- with !lin;
- permission of Petroconsultants International Data Corp. (1996 data).!lin;
- !lin;
- The geologic province boundaries are those defined by USGS World Energy Project.
- (Klett and others,1997).!lin;
-
- EOA
- EOS
-