Google SketchUp 8 (free version available at /download/).ArcGIS 10 with the 3D Analyst and Spatial Analyst extensions.To complete this exercise, the following software and data are required Some familiarity with Google SketchUp may also be helpful. It's assumed that the reader is familiar with ArcGIS Desktop applications and the ArcGIS 3D Analyst extension, including ArcGlobe. The workflow outlined will familiarize the reader with tools in ArcGIS 10 for importing, exporting, and placing different types of 3D features. It uses a geometrically simple urban feature-a freeway overpass in downtown Philadelphia-and starts with a polygon and some high-resolution aerial imagery. This exercise walks the reader through the process of creating and adding texture to a 3D multipatch feature. ArcGIS 10 introduces a host of new 3D data management and analysis capabilities that enhance 3D analysis. The multipatch, Esri's native 3D feature type, is a key element whether working in ArcGlobe or ArcScene. The 3D virtual city is emerging as an essential GIS tool for visualization and analysis in the urban environment-from placing a proposed building construction in the context of its surroundings to conducting analyses in three dimensions such as line-of-sight or 3D volumetric shadows. Figure 1: This exercise shows how to correct this sampling error, commonly seen in high-resolution DEMs in urban environments.
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