GIS Tech News (#34)3 Apr, 2007 By: Andrew G. Roe,P.E.
|The combining of three datasets allows agencies to map and study water systems faster and more effectively.
Engineers and hydrologists performing large-scale water resource analysis in the United States can now access a virtual treasure trove of public domain data that was previously unavailable in one location. Through ongoing collaboration of two federal agencies, the NHD (National Hydrography Dataset) has been integrated with elevation and watershed data to provide a new, cohesive suite of data called NHDPlus, which could vastly shorten the process of modeling watersheds.
The NHD is a basic set of digital spatial data containing information about lakes, rivers, streams and other water bodies, and has been available for most of the United States since 2000 to serve as a foundation in building water resource models. Developed collaboratively by the EPA (U.S. Environmental Protection Agency) and the USGS (U.S. Geological Survey), the NHD combines elements of USGS digital line graph hydrography files and EPA reach files. Although useful as a building block in mapping and watershed studies, the original NHD contained no detailed information about drainage areas, stream velocities or other flow characteristics, so users had to generate or import those parameters from other sources. Read more>>
By Henrik Vestermark
Paradigm Imaging Group, a major scanner distributor in North America for years, introduced its own line of scanners in January. The ImagePro Gx42 HD (high-definition) series, designed for the CAD, GIS, graphic arts and reprographics market, includes six scanner models that fulfill different needs. I had the opportunity to review the ImagePRO GxT42e HD scanner with ImageFLOW scanner software, priced at $18,895. Read more>>
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