Topographic Surface Change Resulting from Dam Construction

Topographic surface change resulting from dam construction (Lake Pleasant near Phoenix, Arizona). The images are NED shaded relief (upper left), SRTM shaded relief (upper right), SRTM NED difference grid (lower left) (blue = significant elevation decrease; red = significant elevation increase), and Landsat image (lower right) overlaid with change polygon extracted from SRTM NED difference grid. Note that the polygon aligns closely with the water as depicted on the Landsat image. The area shown is about 9.3 km east-west by 13.9 km north-south.

See the Significant Topographic Changes in the United States project for more information.