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A Program to Correct Errors in Dem Data.
Proceeds of Geotech '92 Denver Colorado 1992 Aug; :1 pages
Although digital elevation model (dem) data obtainable from the U.S. Geological Survey generally represent the topography of a 7.5-Min quadrangle, a number of error types can occur in the data. These errors can occur during data collection or through introduction of anomalies by the elevation model generation process. Anomalies and errors include holes (below-topography anomalies), spikes (above- topography anomalies), mismatches in elevation where two quadrangles meet, and surface roughness variations unrelated to actual topography. Manual editing (ASCII text editing) of the dem data to correct such errors is tedious, time consuming, and prone to the missing of less obvious error locations. A program has been developed at the Bureau of Mines in Fortran to search for and identify the locations of errors within a dem data set. This presentation discusses the various types of errors and their impact on use of dem data and the search logic used to locate errors.
Proceeds of Geotech '92 (Denver, Colorado, Aug. 29 to Sept. 1, 1992). Geotech, Inc., P. 412
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