A method of remote sensing that obtains optical representations in two or more ranges of frequencies or wave lengths.
TerraLook: GIS-Ready Time-Series of Satellite Imagery for Monitoring Change [ More info] With NASA and JPL, USGS provides satellite images that anyone can use to see changes in the Earth's surface over time. This helps us study changes due to climate, human activities, or meteorological events.
Tracking change over time [ More info] Lesson plan for grades 5-8 to enhance students' learning of geography, map reading, earth science, and problem solving by seeing landscape changes from space, as revealed in Landsat satellite imagery.
USGS Alaska State Mosaic [ More info] Using 172 Scenes from the Multi-Resolution Land Characteristics 2001 collection geometrically and radiometrically aligned, we produced seamless, relatively cloud-free image of the entire state.
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