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Revision History: 99-21
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 Digital Data.
The following links allow you to download digital mapping data including Digital Elevation Model (DEM) files, as well as aerial photos, satellite images and topo-maps. DEM are used files provide terrain model overlays for you cave files. There are also links to information on converting SDTS files to the standard DEM format used by COMPASS.
 Basic Information
 Download DEMs
 Download Topographic Maps

 Libre Project.- Free 7.5 minute topographic images (DRGs)

 Images and Aerial Photographs
 Cave Surveying Tools
  • Auriga - Auriga is a program that allows cave data to be entered, edited and plotted on any Palm, hand-held computer. Auriga data can be imported into Compass.
  • ArcExplorer. ArcExplorer is a free viewer that is available from ESRI. It allows you to view Shapefiles and many other data types including maps, images and aerial photograph.
  • ArcView 60-day Trial. ArcView is the main GIS product from ESRI. This 60-day trial version allows you to experiment with cave data and GIS.
 File Converters. Here are some tools that can be used to convert cave files between different formats.
 Electronic Surveying Tools. We are starting to see useful electronic survey gear.
 COMPASS Related Pages.
 Cave Book
I know this is a bit off the topic of survey software, but here is a book you might find interesting. Over a ten year period, three friends and I put together a book on the discovery and exploration of Lechuguilla Cave. The book begins with the digging project that opened the cave and covers 10 years of history from the early exploration to the nationally televised rescue in 1991. It also covers the people, personalities and politics that were an integral part of the story.

For more information, check out our web page at:

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