1. Stereo Analyst Extension ERDAS product Extension for ArcGIS Desktop View stereo image pairs 3D feature collection

2. Stereo Analyst Extension Project Geology request – Historic aerial photography of Sisk Dam construction site – Looking for explanation of structure feature underneath dam Aerial photography archive – Retrieved film with 60% forward overlap – Scanned to digital format

3. Stereo Analyst Extension

5. Image files must be “oriented” but not orthorectified – Process done in a photogrammetric software application, e.g. LPS, Socet Set, ImageStation Extension used to: – Collect features in 3D for better horizontal accuracy – Collect mass points for creating elevation models

6. Stereo Analyst Extension

8. ERDAS pricing – License ±<$4,000 – Maintenance ±<$800 annually Stereo accessories – Was ± $3,600 per unit – Now ± $600 per unit High end graphics card – ± $4,000