Terrain Modeling and Mapping
- Digital Elevation Models (DEMs)
- US GeoData Digital Elevation Models Fact Sheet
- USGS produces five types of elevation data: 7.5-Minute, 7.5-Minute Alaska, 15-Minute Alaska, 30-Minute, and 1-Degree DEMs.
- 3D Projection (right) displays results of a DEM.
- Mosaic - Grand Canyon
- Mosaic the east and west image pairs (no GCP's or color balancing are needed if the images are from the same orbit).
- Select GCP's to match the east and west halves.
- Warp one half.
- Display both halves in image link mode.
- Color balance/match by applying a normalize contrast stretch using image stats.
- Save color balanced images to files.
- Mosaic the color balanced results with edge feathering.
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