Accession Number : ADA119254

Title :   Algorithms for Digital Terrain Data Modeling.

Descriptive Note : Final rept. Sep 80-Feb 82,

Corporate Author : ZYCOR INC AUSTIN TX

Personal Author(s) : Davis,Dale M ; Downing,James A ; Zoraster,Steven

PDF Url : ADA119254

Report Date : Jul 1982

Pagination or Media Count : 221

Abstract : Algorithms and test results are described for three different general operations used in computerized modeling and mapping. The algorithms are used for transforming strings of contour data into digital elevation models (DEM), transforming DEM's into a set of contour strings for display, and smoothing DEM's using several filtering and convolution techniques. The use of DEM smoothing operations for the simplification of contour lines is examined and two methods of controlling filter effects for this application are presented. As a separate reserach effort two interpolation algorithms which can be used for resampling DEM's are compared. Visual and statistical measures of performance are presented. (Author)

Descriptors :   *Digital maps, *Algorithms, *Terrain models, *Digital simulation, *Mapping, Test methods, Grids, Matrices(Mathematics), Mapping(Transformations), Minicomputers, Elevation, Contours, Two dimensional, Interpolation

Subject Categories : Cartography and Aerial Photography
      Theoretical Mathematics
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE