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Track: Application Development Techniques
Rob Comer
TASC
55 Walkers Brook Dr
Reading, MA 01867
Telephone: 617-942-2000
Fax: 617-942-7100
E-mail: rpcomer@tasc.com
Tom Ofenstein
An ArcView Extension for Interactive Stereo Processing
Defining Issue: The three-dimensional real-world location of an object may be determined from its location in two or more aerial images taken from different perspectives, once the camera positions and attitudes have been determined. However, managing the necessary measurements and processing can be challenging in practice. GIS Solution: As part of work sponsored by Rome Laboratory, TASC has developed an ArcView extension to manage automated stereo photogrammetric processing of aerial imagery. Methodology: The extension enables interactive selection of the raw aerial images to be analyzed, automatically creating a view and an image for each and providing a tool for selecting and labeling points of interest. Following the image point selections, real-world object locations are automatically computed in terms of latitude, longitude, and elevation. The results are then imported for visualization in conjunction with basemap data and/or orthomosaics and for analysis with Esri's Spatial Analyst extension for
ArcView. Software: The stereo processing extension is written in Avenue, and more specialized, compute-intensive photogrammetric operations are performed by native-code executables written in C++.
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