Software and Data QUESTIONS Answering Real-World An antiaircraft gun point feature has been symbolized as two threat dome layers—one with a 5,500-meter radius and the other with an 8,000-meter radius. Using 3D volumetric analysis techniques in ArcGIS 10 By nathan Shephard ArcGIS 3D Analyst Visualization product Engineer Lead The threat dome has been trimmed by the visibility volume for the antiaircraft gun. Continued on page 8 ArcUser Fall 2010 7 www.esri.com