TOPOLOGICAL STRUCTURING OF RASTER-SCANNED LINE MAP DATA.
By: Robin G. Fegeas and Richard A. Pearsall
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Abstract
The U. S. Geological Survey has a requirement for the collection of large amounts of digital map data from existing graphic map separates. Prototype production techniques have been developed to capture line data from the map separates using a raster-scanning input device. After minimal editing in raster form, the data are converted to 'unstructured' vector form. In order to be processed further, the line data must be topologically structured (nodes identified and start-node, end-node, area-left, and area-right tags associated with each line-segment chain). This paper describes the techniques which have been developed at the U. S. Geological Survey to topologically structure the raster-scanned line map data.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | TOPOLOGICAL STRUCTURING OF RASTER-SCANNED LINE MAP DATA. |
| Year Published | 1984 |
| Language | English |
| Publisher | American Congress on Surveying & Mapping |
| Publisher location | Falls Church, VA, USA |
| Larger Work Title | Technical Papers of the American Congress of Surveying and Mapping |
| First page | 264 |
| Last page | 272 |
| Conference Title | Technical Papers of the 44th Annual Meeting of the American Congress on Surveying and Mapping. |
| Conference Location | Washington, DC, USA |
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