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 selective information for academic 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 cover will focus on the following three: demodulator related corrections, reason- sunlight distance correction and solar zenith run corrections, and atmospheric corrections. Sensor related do refer to sensor-specific changes in the data when a remote sensor converts the incoming effulgence to digital numbers. Earth-sun distance corrections look for differences in elucidation repayable to the varying distance of the earth from the sun. Similarly, solar zen ith tumble corrections account for illumination differences due to variations in the unpatterned position of the sun relative to the earth. Finally, atmospheric corrections even up the attenuating and/or scattering effects of the earths cash machine on electromagnetic radiation. We will see through pillow hanky panky exactly what these corrections do and why they are unavoidable vis-à-vis their application to remotely-sensed data of the city of Ottawa, Canada.

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

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