mqdefault.jpg。Terrain Analysis Enhancements to the Height Above Nearest。Spatial Semantic Expression of Terrain Viewshed: A Data。GISと関連技術を用いた地形分析の唯一の参考書。Title:Terrain Analysis-Principles and ApplicationsEditors: John P. Wilson, John C. GallantPublisher: John Wiley & Sons,inc.。WY Chapter Approved 2025 Terrain Pack – Weyland-Yutani Inc