The topographical inputs to the microscale modelling are 20-m digital height contours from 1:50,000 South African topographical maps and vector-format land sur-face roughness maps based on the USGS Global Land Cover Characteristics data... NG Mortensen,J Badger,JC Hansen,... - European Wind ...
摘要: This paper presents a method for the extraction of contour lines and other geographic information from scanned color images of topographical maps. Although topographic maps are available from many ...关键词: Color map analysis USGS map analysis aliasing and false colors. map segmentation ...