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NASA’s Earth Observatory (2013, November 18) How to interpret a Satellite Image: Five Tips and Strategies.NASA Take a tour of the electromagnetic spectrum.Geological Survey, then follow the instructions for Photoshop or ImageJ.
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You can also make your own Landsat images and experiment with band combinations by using software like Adobe Photoshop or ImageJ. See a few examples with a description in the Landsat 7 Compositor, or watch this animation of the Florida Everglades in three different band combinations. You can also explore false color imagery with Landsat. The site also provides descriptions of common MODIS band combinations. Click on “add layers” and then select one of the alternate band combinations (1-2-1, 3-6-7, or 7-2-1). You can explore the way different band combinations highlight different features by using a browse tool called Worldview, which displays data from many different imagers, including Aqua and Terra MODIS. Images from the Advanced Spaceborne Thermal Emission and Reflection Radiometer ( ASTER) and from the early Landsats are often shown in this band combination because that’s what the instruments measured. In the image below, the water is muddy, and the sediment reflects light. This band combination is valuable for gauging plant health.Ĭities and exposed ground are gray or tan, and clear water is black. The signal from plants is so strong that red dominates the false-color view of Algeria below. Since they reflect more near infrared than green, plant-covered land appears deep red. In this case, plants reflect near infrared and green light, while absorbing red. One of our most frequently published combinations uses near infrared light as red, red light as green, and green light as blue. Thermal infrared, usually shown in tones of gray to illustrate temperature.We use this to differentiate between snow, ice, and clouds. Blue (red), two different shortwave infrared bands (green and blue).Shortwave infrared (red), near infrared (green), and green (blue), often used to show floods or newly burned land.This is a traditional band combination useful in seeing changes in plant health. Near infrared (red), green (blue), red (green).Our four most common false-color band combinations are:
Shortwave infrared light highlights the difference between clouds, ice, and snow, all of which are white in visible light. For instance, floods are best viewed in shortwave infrared, near infrared, and green light because muddy water blends with brown land in a natural color image. Though there are many possible combinations of wavelength bands, the Earth Observatory typically selects one of four combinations based on the event or feature we want to illustrate. How to Interpret Common False Color Images
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