| Abstract: | The U.S. Geological Survey (USGS) has produced a River Reach File data layer for the Pacific Northwest for use in water-resource management applications. The Pacific Northwest (PNW) River Reach Files, a geo-referenced river reach data layer at 1:100,000-scale, are encoded with the U.S. Environmental Protection Agency"s (EPA) reach numbers. The encoding was a primary task of the River Reach project, because EPA"s reach identifiers are also an integral hydrologic component in a regional Northwest Environmental Data Base-an ongoing effort by Federal and State agencies to compile information on reach-specific resources on rivers in Oregon, Idaho, Washington, and western Montana. A unique conflation algorithm was developed by the USGS to transfer the EPA reach codes and other meaningful attributes from the 1:250,000-scale EPA TRACE graphic files to the PNW Reach Files. The PNW Reach Files also were designed so that reach-specific information upstream or downstream from a point in the stream network could be extracted from feature attribute tables or from a Geographic Information System. This report documents the methodology used to create this 1:100,000-scale hydrologic data layer. |
| Genre: | USGS Numbered Series |
| ProdID: | 27102 |
| Citation Author: | Fisher, B. J. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iii, 84 p. :ill. ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Branch of Information Services [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 94-4043 |
| Citation Search Results Text: | Methodology used to produce an encoded 1:100,000-scale digital hydrographic data layer for the Pacific Northwest; 1996; WRI; 94-4043; Fisher, B. J. |
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| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Methodology used to produce an encoded 1:100,000-scale digital hydrographic data layer for the Pacific Northwest; 1996; WRI; 94-4043; Fisher, B. J. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1994/4043/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1994/4043/report.pdf |
| Date Other: | Sat, 1 Mar 1997 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
Branch of Information Services [distributor], |
