Numerical assessment of spectral emissivity measurement methods using a field spectroradiometer in the 3- to 13-µm domain

Keyvan Kanani; Laurent Poutier; Marc-Phillipe Stoll; Francoise Nerry

doi:10.1117/12.510645

24 February 2004 Numerical assessment of spectral emissivity measurement methods using a field spectroradiometer in the 3- to 13-μm domain

Keyvan Kanani, Laurent Poutier, Marc-Phillipe Stoll, Francoise Nerry

Author Affiliations +

Proceedings Volume 5232, Remote Sensing for Agriculture, Ecosystems, and Hydrology V; (2004) https://doi.org/10.1117/12.510645
Event: Remote Sensing, 2003, Barcelona, Spain

Abstract

The development of hyperspectral technologies in the infrared domain allows new methods of temperature emissivity separation to be elaborated. These methods, which are inappropriate for multispectral measurements, use the amount of information contained in a measured spectrum to increase the number of equations and stabilise the system to solve, or to differentiate the miscellaneous radiance components reaching the sensor thanks to the narrow bands of the spectrometer. Two techniques based on ground measurement are tested. These are the multi-temperature and the spectral smoothness methods. Both need very weak a priori hypotheses. The first one measures the radiance coming up from a surface for several temperatures (or at different times of the day) and solves the over-determinated system of equations. The only hypothesis is the invariance of emissivity between the measurements. The second one uses the difference of spectral variability between an atmospheric spectrum, which is composed of lines, and an emissivity spectrum, which is smoother. Both methods need the radiance at the surface level and the downward irradiance as inputs. Atmospheric corrections have to be made along the upward path between the surface and the sensor, so the atmosphere has to be accurately characterised (especially for the spectral smoothness). This paper presents a numerical study of both methods (spectral smoothness and multi-temperature method). The effects of the radiative transfer on the retrieved emissivity are analysed and protocols to characterise the atmospheric contribution to the measured signal are described. Finally, a sensitivity analysis and an error budget of the methods are presented.

Citation Download Citation

Keyvan Kanani, Laurent Poutier, Marc-Phillipe Stoll, and Francoise Nerry "Numerical assessment of spectral emissivity measurement methods using a field spectroradiometer in the 3- to 13-μm domain", Proc. SPIE 5232, Remote Sensing for Agriculture, Ecosystems, and Hydrology V, (24 February 2004); https://doi.org/10.1117/12.510645

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
10 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Calibration

Temperature metrology

Sensors

Reflectivity

Absorption

Black bodies

Atmospheric sensing

Show All Keywords

Keywords/Phrases

Search In:

Publication Years