Accession Number : ADA119257

Title :   An Analysis of a Relaxation Scheme to Improve Terrain Elevation Data.

Descriptive Note : Research note,

Corporate Author : ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA

Personal Author(s) : Crombie,Michael A ; Shine,James A

PDF Url : ADA119257

Report Date : Jul 1982

Pagination or Media Count : 27

Abstract : Elevation matrices derived from correlation of digital stereo images often contain errors resulting from a breakdown of the correlation process. One such matrix was corrected using a relaxation algorithm where each point was given a reliability based on comparison with its nearest and next-nearest neighbors. These reliabilities were then used to determine if and how much a point was to be corrected; the process was iterated. The algorithm removed small error areas, but large erroneous regions wer not corrected, even when terrain slope classification information was considered. (Author)

Descriptors :   *Mapping, Stereophotogrammetry, Image processing, Correlation techniques, Digital systems, Terrain, Elevation, Errors, Corrections, Algorithms, Relaxation

Subject Categories : Cartography and Aerial Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE