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Title: An investigation of kernels for shading of elevation data
Authors: McDonnell, Michael M.
Keywords: Terrain visualization
Terrain display
Geographic data
Shaded relief
Publisher: U.S. Army Topographic Engineering Center.
Engineer Research and Development Center (U.S.)
Series/Report no.: TEC ; 0059.
Description: Report
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.
Rights: Approved for public release; distribution is unlimited.
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