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 The following is a short list of informative Web sites and reports related to the acquisition, creation, application, and delivery of digital elevation data. We hope to revise this page on a regular basis. Geospatial One-Stop 2/20/04 The USGS National Elevation Dataset (NED) Assembled by the U.S. Geological Survey, the NED is designed to provide National elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections were made to minimize artifacts, perform edge matching, and fill sliver areas of missing data. NED has a resolution of one arc-second (approximately 30 meters) for the conterminous United States, Hawaii, and Puerto Rico and a resolution of two arc-seconds for Alaska. 5/9/01 Airborne Laser Mapping The one-stop LIDAR reference source. 4/20/01 FEMA LIDAR Guidelines - Appendix 4B FEMA guidelines and specifications for Airborne LIght Detection and Ranging Systems. Links to the FEMA Map Modernization site and related subjects. Appendix 4B is currently under revision. 6/12/01 Topographic Change Mapping An informative NOAA site with information on the use of LIDAR technology to document topographic changes along shorelines. Many reference links as well. 3/29/01 Have You Seen the Light? An article from GeoPlace's GeoWorld site on the creation of DTMs from LIDAR for large-scale, high-accuracy mapping. 8/30/01 New Tools Produce Classic Cartographic Effects Links to an ESRI ARCUSER article on "alternatives to hillshading--illuminated contours, hachures, and point symbols--for portraying topography. These methods combine classical cartographic techniques with GIS software for greater visual impact." 7/3/01 Evaluation of Multi-Return LIDAR for Forestry Applications (PDF - 974k)is a USDA Forest Service study of to "map" the canopy, the bare earth, and many of the structural characteristics such as canopy height, volume, and basal diameter from a single flight utilizing LIDAR. 12/00 Evaluation of the Utility and Accuracy of LIDAR and IFSAR Derived Digital Elevation Models for Flood Plain Mapping (PDF - 681k) is a comparison study of those technologies conducted by the North Carolina Geographic Information and Analysis. 3/30/01 This page contains links to documents presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. Download the latest version of Acrobat Reader, free of charge or go to access.adobe.com for free tools that allow visually impaired users to read PDF files. |
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