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Usgs National Hydrography Dataset Newsletter

By Simley, Jeff

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Book Id: WPLBN0000116200
Format Type: PDF eBook
File Size: 0.1 MB
Reproduction Date: 2007
Full Text

Title: Usgs National Hydrography Dataset Newsletter  
Author: Simley, Jeff
Volume:
Language: English
Subject: Ecology, Natural resource issues, Environemtal protection
Collections: Environmental Awareness Library Collection
Historic
Publication Date:
Publisher: United States Environmental Protection Agency

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Simley, J. (n.d.). Usgs National Hydrography Dataset Newsletter. Retrieved from http://www.worldebooklibrary.net/


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Excerpt: 100K Status: A final step in the production of intermediate-scale NHD is to correctly set the stream level based on the proper sequence of streams making up the final national database. Every effort was made to correctly code the levels in the initial 1:100K-scale production, but they may need to be updated as the full network is established. This re-leveling process is underway with just under half the nation completed. The entire process should be completed mid-way through the fiscal year. At present, the majority of the re-leveled sub-basins have not been re-entered into the FOD because of a backlog problem, however, it is hoped to clear the backlog in the next month. This process is having some effect on high resolution production because the intermediate-scale stream levels are transferred in creating the high resolution product. If the stream levels are changed after the high resolution NHD is complete, the high resolution levels may not be correct.

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