![]() How to Interpret Common False Color Images Enhancing the subtle differencesīetween the 3 bands of reflected shortwave infrared light used to make this image gives each mineral a Making it possible to map out geology by comparing reflected SWIR light. Each rock type reflects shortwave infrared light differently, The mountains around China’s Piqiang Fault. In the image below, different types of sandstone and limestone make up Active fires, lava flows, and other extremely hot features “glow” in the Newly burned land reflects strongly in SWIR bands, making them valuable for Shortwave-infrared bands are also useful forĭistinguishing between cloud types (water clouds versus ice clouds) and between clouds, snow, and ice, all of This means SWIR measurements can help scientistsĮstimate how much water is present in plants and soil. Soil, the darker the image will appear at these wavelengths. Shortwave infrared light in three regions: 1,400, 1,900, and 2,400 nanometers. Shortwave infrared (SWIR) light includes wavelengths between 1,100 and 3,000 nanometers. These colors are similar to what you would see from an airplane. (A related animation shows how the images were made.) The visible light image shows dark green forest, light green agriculture, brown wetlands, silver urban areas (the city of Miami), and turquoise offshore reefs and shallows. ![]() This series of Landsat images of southeastern Florida and the Northern Everglades illustrates why you might want to see the world in false color. ![]() (For instance, grass isn’t always green.) Such false-color band combinations reveal unique aspects of the land or sky that might not be visible otherwise. As a result, the colors in the final image may not be what you expect them to be. (For tips on understanding true-color images, read How to Interpret a Satellite Image on the Earth Observatory.")Ī false-color image uses at least one non-visible wavelength, though that band is still represented in red, green, or blue. ![]() The result looks like the world as humans see it. Because most visible colors can be created by combining red, green, and blue light, we then combine the red, green, and blue-scale images to get a full-color representation of the world.Ī natural or “true-color” image combines actual measurements of red, green, and blue light. To make a satellite image, we choose three bands and represent each in tones of red, green, or blue. ![]()
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