A New Technique for Separation of Temperature and Emissivity – Thermal Infrared Remote Sensing

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Authors
  1. Lahaie, P.
Corporate Authors
Defence R&D Canada - Valcartier, Valcartier QUE (CAN)
Abstract
We describe in this report a new technique for the separation of temperature and emissivity in the thermal infrared part of the electromagnetic spectrum. The measurement taken with by a passive remote sensing instrument is radiance. This radiance is a combination of components originating from the atmosphere and from the ground. Once the atmospheric contribution is removed, the result is radiance from the ground that depends on its fundamental parameters i.e. temperature and emissivity. These parameters are useful to determine the nature and use of the material under observation. The new technique presented here is based on an iterative scheme for the selection of temperature and of its corresponding emissivity. At each temperature evaluates a criterion, the total square error. The selected temperature is the one showing the smallest error. To evaluate the error we first compute the equivalent emissivity at a given temperature, we smooth the emissivity using a linear procedure by the summation of the squared difference between the ground radiance and the new currently airborne imaging FTIR sensor (AIRIS) built by DRDC Valcartier is targeted as an application of interest for this algorithm. However, it can be applied to imaging sensor with at least six bands.

Il y a un résumé en français ici.

Keywords
Emissivity;Temperature;Thermal hyperspectral imagery;Atmospheric correction
Report Number
DRDC-VALCARTIER-TM-2004-124 — Technical Memorandum
Date of publication
01 Dec 2004
Number of Pages
44
DSTKIM No
CA025642
CANDIS No
523015
Format(s):
CD ROM

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