Snow and ice are very reflective in the visible part of the spectrum Band 1 , and absorbent in Bands 2 near infrared and 7 short-wave infrared, or SWIR. Thick ice and snow appear vivid sky blue, while small ice crystals in high-level clouds will also appear blueish, and water clouds will appear white. Vegetation and bare ground Vegetation is very reflective in the near infrared Band 2 , and absorbent in Band 1 and Band 7. Assigning that band to green means even the smallest hint of vegetation will appear bright green in the image.
Naturally bare soil, like a desert, is reflective in all bands used in this image, but more so in the SWIR Band 7, red and so soils will often have a pinkish tinge. When bare soil becomes exposed, the brightness in Band 1 may increase, but that may be offset by the presence of black carbon residue; the near infrared Band 2 will become darker, and Band 7 becomes more reflective.
When assigned to red in the image, Band 7 will show burn scars as deep or bright red, depending on the type of vegetation burned, the amount of residue, or the completeness of the burn. Sediments in water appear dark blue. Ice and snow appear as bright turquoise. Clouds comprised of small water droplets scatter light equally in both the visible and the SWIR and will appear white. These clouds are usually lower to the ground and warmer.
High and cold clouds are comprised of ice crystals and will appear turquoise. It is not a standard, science quality product. The purpose of this algorithm is to provide natural-looking images by removing gross atmospheric effects, such as Rayleigh scattering, from MODIS visible bands The algorithm was developed by the original MODIS Rapid Response team to address the needs of the fire monitoring community who want to see smoke.
Corrected Reflectance shows smoke more clearly than the standard Surface Reflectance product. In clear atmospheric conditions the Corrected Reflectance product is very similar to the MOD09 product, but they depart from each other in presence of aerosols.
If you wish to perform a complete atmospheric correction, please do not use the Corrected Reflectance algorithm. Please see your browser settings for this feature. EMBED for wordpress. Want more? Advanced embedding details, examples, and help! Topics All , Star. They were previously only available on microfilm at the Archives, and were never before available online or in any other format.
Those records we Total Views 1,, Older Stats. Total Items Older Stats. Internet Archive's 25th Anniversary Logo. Search icon An illustration of a magnifying glass. User icon An illustration of a person's head and chest. View result data in web browser Save result data to file on computer. This attempts to filter the downloaded data to only include those reports you want.
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