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Estimating Slopes In Images Of Terrain By Use Of BRDFProposed method of estimating slopes of terrain features based on use of bidirectional reflectivity distribution function (BRDF) in analyzing aerial photographs, satellite video images, or other images produced by remote sensors. Estimated slopes integrated along horizontal coordinates to obtain estimated heights; generating three-dimensional terrain maps. Method does not require coregistration of terrain features in pairs of images acquired from slightly different perspectives nor requires Sun or other source of illumination to be low in sky over terrain of interest. On contrary, best when Sun is high. Works at almost all combinations of illumination and viewing angles.
Document ID
19950065180
Document Type
Other - NASA Tech Brief
Authors
Scholl, Marija S. (Caltech)
Date Acquired
August 17, 2013
Publication Date
January 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 1
ISSN: 0145-319X
Subject Category
PHYSICAL SCIENCES
Report/Patent Number
NPO-19133
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.