Radiometric Correction of LandsatTM Data -example of how to do radiometric corrections

Radiometric Correction of Landsat Data GEOG 535 January 15, 2004 Introduction Typically, when one acquires remotely-sensed data for academic or commercial message subprograms it is unsuitable for immediate use. That is, several(prenominal) types of department of corrections must be applied. One set of corrections that is crucial to the use of remotely-sensed data, peculiarly in quantitative geography, is know as radiometric correction. Though thither are many classes of radiometric corrections, this newspaper publisher will focus on the following three: sensor related corrections, reason- sunlight distance correction and solar zenith cant corrections, and atmospheric corrections. Sensor related do refer to sensor-specific changes in the data when a remote sensor converts the incoming refulgence to digital numbers. Earth-sun distance corrections look for differences in shimmer repayable to the varying distance of the earth from the sun. Similarly, solar zenith loco mote corrections account for illumination differences due to variations in the unmingled position of the sun relative to the earth. Finally, atmospheric corrections determine the attenuating and/or scattering effects of the earths cash machine on electromagnetic radiation. We will see through pillow drop off exactly what these corrections do and why they are fateful vis-à-vis their application to remotely-sensed data of the city of Ottawa, Canada. Aim The aim of this postulate is to progress to an understanding of the principles of the radiometric corrections described above and assess their effect(s) on satellite images as well as data derived from give tongue to images, such as vegetation indices and spectral signatures. The data employ in this exercise consists of six images of Ottowa, Canada obtained from Landsat TM 5 bands 1-5 and 7. Methods Part 1 The purpose of this section of the athletic field is see how at-satellite spectral reflectance varies with chan ges in the distance betwixt the earth and t! he sun and the position of the sun relative to the earth. To see... If you pauperism to get a full essay, rank it on our website: OrderCustomPaper.com

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