Document Type : Research Paper

Author

• Alireza Azmudeh Ardalaan

Abstract

TM sensor information is a peerless tool for ecologists, including in the estimation of the damage caused by fire. The two pictures that can be seen show the US Yellowstone National Park. These images result from the combination of data for band 7 (within the range of the red spectrum), 5 (within the range of the green spectrum), and 3 (within the range of the blue spectrum). By comparing these two images, it is possible to estimate the damage caused by the fire of the summer of 1988. In the image on the left which was received on July 31, 1988 (before the fires took place at the hot spring of Old Faithful), the basin of this spring is easily recognizable by the area in the north of the central part of the image, which has high radiation levels.