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 entropy for schoolman or commercial message subprograms it is unsuitable for immediate use. That is, some(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 cognize as radiometric correction. Though thither are many classes of radiometric corrections, this story will focus on the following three: sensor related corrections, reason- sunlight distance correction and solar zenith tiptoe corrections, and atmospheric corrections. Sensor related do refer to sensor-specific changes in the data when a remote sensor converts the incoming gleam to digital numbers. Earth-sun distance corrections look for differences in blaze repayable to the varying distance of the earth from the sun. Similarly, solar zenith slant correction s account for illumination differences due to variations in the evident position of the sun relative to the earth. Finally, atmospheric corrections aline the attenuating and/or scattering effects of the earths cash machine on electromagnetic radiation. We will see through pillow luxate exactly what these corrections do and why they are undeniable vis-à-vis their application to remotely-sensed data of the city of Ottawa, Canada.

Aim The aim of this chew over is to progress to an understanding of the principles of the radiometric corrections described above and appraise their effect(s) on satellite images as well as data derived from give tongue to images, such as vegetation ind ices and spiritual signatures. The data em! ploy 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 assume is see how at-satellite spectral reflectance varies with changes in the distance amidst the earth and the sun and the position of the sun relative to the earth. To see... If you wishing to get a full essay, rank it on our website: OrderEssay.net

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