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Mapping the distribution of chemical elements county-by-county
Posted on April 07, 2008
Data from chemical analyses of more than 60,000 stream-sediment and soil samples from all 50 States are now available online courtesy of the USGS. These data will be used to determine naturally occurring levels of chemical elements in stream sediments, and to detect regional chemical anomalies that may affect human health.
 

Google Earth 101 - Using the Image Overlay Tool in Google Earth
Posted on August 13, 2007
In this article you will learn how to use the image overlay functionality provided in Google Earth to import existing images into the 3D display and drape them over the existing terrain.  Many image file formats can be displayed in Google Earth including jpg, bmp, gif, tiff, tga, png, and a number of others. 
 

Locate and Download free USGS GeoPDF maps using the Map Downloader
Posted on May 10, 2007
The USGS has a number of clever ways for users to search, navigate, purchase, and download maps and data... the Map Locator is the latest addition and it's pretty darned sweet! Using a Google Maps UI, visitors search the map by entering a search string, zoom into an area of interest, or select a point on the map for relevant hits. Once you've explored, you then have access to free data served up as GeoPDFs... read on for more about working with these GeoPDF data products... best of all this is all FREE! 
 

10+ Cool things a GIS user might do with Google Earth
Posted on January 02, 2007
During 2006 Google Earth was making headlines... there's no doubt about that! We now have access to Google Earth release 4 (Beta),  Google Earth Plus, Google earth Pro, Google Earth Enterprise solutions, SketchUP, and other cool  Earth viewing apps. For the GISuser, there's a number of cool tools and add-ons designed to help integrate your GIS data and workflows within the Google Earth environment. The following are some of the most popular GIS user / Google earth add-ons and apps that we've highlighted here at GISuser.com (did we miss something?? tell us about it!)
 

The GISuser's Guide to locating and downloading Free USGS data
Posted on February 24, 2004
So, you need to work with USGS data. Perhaps you need DRGs, maybe some DEMs, or maybe even some DOQQs. Before you begin the search, make sure your familiar with some of the pieces of information we've provided below. Which quads do I need? How can I translate and/or view the data? Where can I download the data? Read on for some answers to these questions and more.
 

GISuser Guide to Accessing Free 2002 TIGER/Line data
Posted on February 26, 2004
The US Census Bureau makes available the 2002 TGER/Line files for free download. The TIGER/Line files are extracts of selected geographic and cartographic information from the Census Bureau's TIGER® (Topologically Integrated Geographic Encoding and Referencing) database.
 

Case Study: Detroit Eases the Burden of Multiple Data Formats
Posted on October 28, 2004
With Intergraph GeoMedia technology, city departments and neighboring counties share data effortlessly. We look at the challenges faced, the objectives, and the solution.
 

Open Access to USGS DEM data... Myth Or Reality? You Be The Judge
Posted on March 22, 2006
Say what you want about the SDTS format, however, given that data format there's not much you can do about that. But what about access to native USGS SDTS DEM data? You actually do have a say (somewhat) about it and many GIS professionals are still left wondering why these data are only available from a select few commercial data providers (portals)? Read on as we explore this topic a little deeper.
 

GISuser Guide to downloading Free 7.5 minute DEMs
Posted on February 29, 2004
Are you searching for standard 7.5 minute USGS DEMs? You may have already discovered that the USGS no longer makes these data available for free download via FTP or any other mechanism for that matter.
 

GISuser Guide to USGS Orthoimagery and DOQQs
Posted on February 25, 2005
The Digital Orthophoto Quarter Quadrangle (DOQQ) is an established product with the USGS and is another orthoimagery layer of The National Map. They cover an area measuring 3.75-minutes longitude by 3.75-minutes latitude or 7.5-minutes longitude by 7.5-minutes latitude.
 

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