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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 18 — Jun. 20, 2002
  • pp: 3523–3529

Bandpass-Resampling Effects for the Retrieval of Surface Emissivity

Rudolf Richter and Cesar Coll  »View Author Affiliations


Applied Optics, Vol. 41, Issue 18, pp. 3523-3529 (2002)
http://dx.doi.org/10.1364/AO.41.003523


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Abstract

The retrieval of surface emissivity in the 8–14-μm region from remotely sensed thermal imagery requires channel-averaged values of atmospheric transmittance, path radiance, and downwelling sky flux. Bandpass resampling introduces inherent retrieval errors that depend on atmospheric conditions, spectral region, bandwidth, flight altitude, and surface temperature. This simulation study is performed for clear sky conditions and moderate atmospheric water vapor contents. It shows that relative emissivity retrieval errors can reach as much as 3% for broadband sensors (1–2-μm bandwidth) and 0.8% for narrowband instruments (0.15 μm), even for constant surface emissivity. For spectrally varying surface emissivities the relative retrieval error increases for the broadband instrument by ~2% in channels with strong emissivity changes of 0.05–0.1. The corresponding retrieval errors for narrowband sensors increase by approximately 3–4%. The channels in the atmospheric window regions with lower transmittance, i.e., 8–8.5 and 12.5–14 μm, are most sensitive to retrieval errors.

© 2002 Optical Society of America

OCIS Codes
(100.0100) Image processing : Image processing
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(280.0280) Remote sensing and sensors : Remote sensing and sensors

Citation
Rudolf Richter and Cesar Coll, "Bandpass-Resampling Effects for the Retrieval of Surface Emissivity," Appl. Opt. 41, 3523-3529 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-18-3523

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