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：2010
卷号：XXXVIII Part 4
出版社：Copernicus Publications
摘要：This paper presents a method for terrain generalization using Laplacian pyramids. The method pre-processes digital terrain forgenerating cartographically generalized 3D maps. Map authors can attenuated or amplify selected frequency bands of the terrain with agraphical interface imitating an audio equalizer. Ridge lines and valley lines are localized by curvature indices, and their characteristicshapes are preserved or emphasized using additional sets of equalizer controls. Frequency bands are adjusted separately for theforeground and the background to remove visually disturbing terrain detail in the background. This is relevant for 3D maps in centralperspective projection considerably compressing distant terrain features. The proposed generalization method was implemented inTerrain Equalizer, a free and open-source application providing a graphical interface with interactive 3D previews (available athttp://www.terraincartography.com/). Using this application, disturbing high frequency details can be easily removed and majormountain forms can be accentuated. The level of generalization can be adjusted seamlessly from the foreground to the background of the3D map. Topographic break lines, such as ridge or valley lines, are successfully preserved, which is important for conveying thecharacteristic shape of a generalized terrain
关键词：Terrain generalization; DEM frequency filtering; Laplacian pyramid; Terrain Equalizer
