Satellite Image of Iowa
by Mark A. Alexander and James D. Giglierano
This color-infrared scene is a mosaic of 12 Landsat Thematic Mapper images taken between April and June, 1989 to 1993. Features on the ground have different colors due to spectral responses of materials to different wavelengths of light. Water appears black, while vegetation reflects in shades of orange to red. Note the drainage patterns across Iowa and the riparian vegetation zones along stream corridors such as the Wapsipinicon, Cedar, Iowa, Des Moines, and Little Sioux rivers. Bare soil varies between dark blue (wet) and light blue-green (dry). Wet streaks across northwest Iowa are caused by recent rain. Urban areas, such as Des Moines left of center, are purple. Other areas of interest are the forests and pastures of northeastern and south-central Iowa.
Adapted from Iowa Geology 2000, Iowa Department of Natural Resources