Accession Number : ADA296595

Title :   An Investigation of Kernels for Shading of Elevation Data,

Descriptive Note : Final rept. 1 Jun 89-1 Jun 90,

Corporate Author : ARMY TEST AND EXPERIMENTATION CENTER FORT ORD CA

Personal Author(s) : McDonnell, Michael M.

PDF Url : ADA296595

Report Date : MAY 1995

Pagination or Media Count : 18

Abstract : This report examines the results of enhancing displays of an elevation array by using mathematical shading. The variable examined in this report is the shape of the primitive region by which shading is calculated. This primitive region is called a kernel. Three kernels are examined; triangles, quadrilaterals (actually squares), and a hybrid shape that seemed as though it might have fewer artifacts. The result is that shaded quadrilaterals seem to be more isotropic and to have fewer artifacts than the other shapes examined. Shading using quadrilateral kernels is also the easiest to calculate. All shading was done using the Gouraud technique. (AN)

Descriptors :   *COMPUTER GRAPHICS, *ELEVATION, *TERRAIN MODELS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, IMAGE PROCESSING, SHAPE, KERNEL FUNCTIONS, SURFACES, THREE DIMENSIONAL, SLOPE, DATA DISPLAYS, GEOGRAPHIC AREAS, SURVEYING(GEOGRAPHIC), SHADOWS, TRIANGLES.

Subject Categories : Geodesy
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE