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Directional effects consideration to improve out-doors emissivity retrieval in the 3-13 mum domain.

Authors
  • Kanani, Keyvan
  • Poutier, Laurent
  • Nerry, Françoise
  • Stoll, Marc-Philippe
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Sep 17, 2007
Volume
15
Issue
19
Pages
12464–12482
Identifiers
PMID: 19547618
Source
Medline
License
Unknown

Abstract

This work analyses and solves for issues encountered when retrieving surface emissivity in LWIR (750 to 1250 cm(-1)) and MWIR (2000 to 3500 cm(-1)) bands under outdoor conditions. The Spectral Smoothness method, which takes advantage of high spectral resolution measurements to solve for temperature emissivity separation, and which has already proven its efficiency in the LWIR domain, was applied in an experimental campaign to assess its ability to operate both in the LWIR and MWIR domains. In the MWIR band, directional behaviour of surface emissivity is shown to be a source of systematic errors in the retrieved emissivity and a new method, called SmaC (SMoothness And Continuity), corrects for this error by providing quantitative estimates on the deviation of the surface from Lambertian behavior.

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