----- Forwarded Message ----- From: dirt...@comcast.net To: "Cave NM" <nmca...@caver.net>, "Cave Texas" <Texascavers@texascavers.com> Sent: Tuesday, December 14, 2010 11:29:38 AM Subject: The next generation of digital topographic maps
The next generation of digital topographic maps I may have missed a post, if so, I apologize in advance for the duplication. However, I did not know about this previously and find it quite useful. DirtDoc >From the web site: http://nationalmap.gov/ustopo/ US Topo is the next generation of digital topographic maps from the U.S. Geological Survey . Arranged in the traditional 7.5-minute quadrangle format, digital US Topo maps are designed to look and feel like the traditional paper topographic maps for which the USGS is so well known. At the same time, US Topo maps provide modern technical advantages that support wider and faster public distribution and enable basic, on-screen geographic analysis for all users. US Topo maps are available free on the Web. Each map quadrangle is constructed in GeoPDF® format from key layers of geographic data – orthoimagery , roads , geographic names , contours and hydrographic features - found in The National Map , which is a nationwide collection of integrated data from local, State, Federal, and other sources.
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