| Abstract: | In the process of developing a continuous hydrographic data layer for water resources applications in the Pacific Northwest, map-edge discontinuities in the U.S. Geological Survey 1:100 ,000-scale digital data that required application of computer-assisted edgematching procedures were identified. The spatial data sets required by the project must have line features that match closely enough across map boundaries to ensure full line topology when adjacent files are joined by the computer. Automated edgematching techniques are evaluated as to their effects on positional accuracy. Interactive methods such as selective node-matching and on-screen editing are also reviewed. Interactive procedures complement automated methods by allowing supervision of edgematching in a cartographic and hydrologic context. Common edge conditions encountered in the preparation of the Northwest Rivers data base are described, as are recommended processing solutions. Suggested edgematching procedures for 1:100,000-scale hydrography data are included in an appendix to encourage consistent processing of this theme on a national scale. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 20264 |
| Citation Author: | Nebert, D. D. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iii, 11 p. :ill. ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Books and Open-File Reports Section [distributor], |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 89-579 |
| Citation Search Results Text: | Review of edgematchimg procedures for digital cartographic data used in Geographic Information Systems (GIS); 1989; OFR; 89-579; Nebert, D. D. |
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| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Review of edgematchimg procedures for digital cartographic data used in Geographic Information Systems (GIS); 1989; OFR; 89-579; Nebert, D. D. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1989/0579/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1989/0579/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
Books and Open-File Reports Section [distributor], |
