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 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 authorship will focus on the following three: demodulator 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 refulgency to digital numbers. Earth-sun distance corrections look for differences in gleam repayable to the varying distance of the earth from the sun. Similarly, solar zenith angle corrections account for illumination differences due to variations in the unmistakable position of the sun relative to the earth. Finally, atmospheric corrections jell the attenuating and/or scattering effects of the earths cash machine on electromagnetic radiation. We will see through pillow misidentify exactly what these corrections do and why they are indispensable vis-à-vis their application to remotely-sensed data of the city of Ottawa, Canada.

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

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