Visualization of high-resolution digital terrain

Abstract

We explore two methods for real-time generation of more realistic two and three-dimensional terrain displays than what are currently available on relatively inexpensive graphics workstations. The first method involves using a high-resolution terrain elevation database. The second method involves coloring and shading the terrain with gray-scale data obtained from associated aerial photography. Both methods were implemented with a three-dimensional simulator utilizing a high resolution digital terrain database that was generated from processed F-14 stereo imagery. We describe our simulator, the High-Resolution Digital Terrain Model (HRDTM), listing its capabilities and graphics features. We also present how the system performs on a high-performance graphics workstation. The High Resolution Digital Terrain Model simulator was developed as part of a joint master of science degree thesis for Captain William O Breden, USMC and Captain James J. Zanoli, USA. Captain Breden was responsible for database manipulation, the user interface, the two and three-dimensional terrain display, the magnification capability, the variable gamma ramp capability. and the camera (laser printing) capability. Captain Zanoli was responsible for file input/output, elevation contour map and aerial photo display, initial three-dimensional terrain display, and data panel performance measurements.