期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1998
卷号：XXXII Part 4
出版社：Copernicus Publications
摘要：The authors have developed a new method called "Polygon Shift Method" (named by the first author) that enables togenerate bird's eye view of topographic landscape with shade and shadow. The Polygon Shift Method is based onBoolean operations between an original polygon given in a form of contour zone and the shifted polygon with a certainshift direction and amount as specified.The visibility check or hidden point processing in the process of generating bird's eye view of topographic landscape istheoretically and logically implemented with newly defined indices of "fore and aft" side and "depth distance" in thePolygon Shift Method.Similar procedure can be applied to generate hill shading as well as to analyze projected shadow from mountains toothers topography. It was demonstrated and evaluated that the Polygon Shift Method developed by the authors broughtup a tremendous improvement to speed up and also simplify the complicate procedures of visibility check for bird's eyeview and shadow analysis.
