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Terrain models used in training software for several missile systems are built using photogrammetric algorithms in an application program called Range Finder. The initial version of Range Finder, used to create the first set of terrain models for the Javelin training software in late 1999 and early 2000, relied on creating a terrain model in sections, one stereo pair at a time, and then merging these separate models into the completed model for the full panoramic scene. Since that time the Range Finder software has been restructured to handle a complete block of photos together, resulting in a more efficient workflow, improved accuracy of the final terrain model, and better visual quality of the stitched image. This report documents the mathematical methods and some of the operational details of this new block-oriented version of the software.