Algorithm to calculate proportional area transformation factors for digital geographic databases
A computer technique is described for determining proportionate-area factors used to transform thematic data between large geographic areal databases. The number of calculations in the algorithm increases linearly with the number of segments in the polygonal definitions of the databases, and increases with the square root of the total number of chains. Experience is presented in calculating transformation factors for two national databases, the USGS Water Cataloging Unit outlines and DOT county boundaries which consist of 2100 and 3100 polygons respectively. The technique facilitates using thematic data defined on various natural bases (watersheds, landcover units, etc.) in analyses involving economic and other administrative bases (states, counties, etc.), and vice versa.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5331950
- Report Number(s):
- CONF-8310244-1; ON: DE84004456
- Resource Relation:
- Conference: Spatially-Oriented Referencing Systems Association (SORSA) general meeting, College Park, MD, USA, 10 Oct 1983
- Country of Publication:
- United States
- Language:
- English
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