GIS Tech News (#34)

2 Apr, 2007 By: Andrew G. Roe,P.E.

Data Integration Speeds Water Modeling

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>>

First Look Review: ImagePRO GxT42

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>>

Cadalyst's complete list of upcoming events is always available on our Web site. Cadalyst's sister publication, Geospatial Solutions, also offers a full calendar of GIS-related events.

ESRI Business GeoInfo Summit
April 23-25, 2007
Dallas, Texas
This fourth annual conference will brief C-level executives, managers and developers on geospatial analysis and business intelligence capabilities for the enterprise. Sessions and technical demonstrations will examine the role of GIS technology in managing spatial and customer data across the enterprise, integrating real-time information for operations and serving geographic data for applications and Web services. Read more

2007 GeoTec Event
May 14-17, 2007
Calgary, Alberta, Canada
GeoTec Media, the publisher of GeoWorld magazine and developer of the Web portal, will be hosting this 21st annual GeoTec Event. The 2007 GeoTec Event will be held in conjunction with the GeoAlberta Conference at the Calgary Telus Convention Centre. Read more

Map Asia 2007
August 14-16, 2007
Kuala Lumpur, Malaysia
The 6th Annual International Conference and Exhibition on Geographical Information Technology and Applications leverages an international initiative aimed to provide an apt platform for the convergence, sharing and use of Geospatial technologies. Read more


Learning Curve (AutoCAD Tutorial): To Whom Do You Attribute That Information?
This month, Cadalyst's Bill Fane tells how to use attributes to attach a quality or a value to a block insertion in AutoCAD.   Read more

Circles and Lines (AutoCAD Tutorial): Digging Deeper into Materials
Cadalyst columnist Lynn Allen explains how to customize materials to get the look you want.  Read more

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Cadalyst's sister publication, Geospatial Solutions, offers a Web site packed with features, news, events and other information for users of geospatial technologies. Check out this latest news from

ARINC Delivers Mobile Communications Vehicle to Maryland Transit Administration
ARINC has delivered a new Mobile Communications Vehicle to the Maryland Transit Administration. Read more

GITA Issues Call for Papers for Annual Conference 31
The Geospatial Information & Technology Association has issued a Call for Papers for its Annual Conference 31, to be held March 9-12, 2008, at the Washington State Convention Center in Seattle, Washington. Read more

Cadalyst contributing editor Andrew G. Roe is a licensed civil engineer and president of AGR Associates. He is also author of Using Visual Basic with AutoCAD, published by Autodesk Press. Reach him at

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