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 information for academician 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 know as radiometric correction. Though thither are many classes of radiometric corrections, this theme will focus on the following three: detector related corrections, reason- sunlight distance correction and solar zenith list corrections, and atmospheric corrections. Sensor related do refer to sensor-specific changes in the data when a remote sensor converts the incoming glow to digital numbers. Earth-sun distance corrections look for differences in glare repayable to the varying distance of the earth from the sun. Similarly, solar zenith move correction s account for illumination differences due to variations in the ostensible position of the sun relative to the earth. Finally, atmospheric corrections rectify 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 necessary vis-à-vis their application to remotely-sensed data of the city of Ottawa, Canada.

Aim The aim of this take aim is to progress to an understanding of the principles of the radiometric corrections described above and prize their effect(s) on satellite images as well as data derived from give tongue t! o images, such as vegetation indices and phantasmal 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 strike is see how at-satellite spectral reflectance varies with changes in the distance amid the earth and the sun and the position of the sun relative to the earth. To see... If you insufficiency to get a full essay, rank it on our website: OrderCustomPaper.com

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