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The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery

Feng, Jilu and Rivard, Benoit and Rogge, Derek and Sánchez-Azofeifa, Arturo (2013) The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery. Remote Sensing of Environment, 131, pp. 173-181. Elsevier.

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Official URL: http://dx.doi.org/10.1016/j.rse.2012.12.018


There has been a progressive emergence of airborne longwave spectral sensing capabilities (e.g. spatially enhanced broadband array spectrograph system, SEBASS) of potential value for remote geological mapping in arctic and subarctic regions. However the presence of rock encrusting lichens can obscure spectral features diagnostic of minerals. This paper documents the longwave (3–14 μm) spectral transmittance and reflectance properties of rock encrusting lichens as determined from lichen samples, from rock samples encrusted with lichens and observations from airborne SEBASS imagery. The samples and SEBASS airborne hyperspectral imagery were acquired over the 1.9 Ga Cape Smith greenstone belt of northern Quebec. Within the Restrahlen region (8–12 μm), where silicate minerals display peaks in reflectance, the maximum reflectance observed for rock encrusting lichens is 1.6%. These lichens display low reflectance and spectral contrast and approach a blackbody behavior. For lichens detached from the rock substrate, spectra obtained on two backgrounds of contrasting reflectance are similar (< 0.75% difference in reflectance) indicating that lichens transmit little or no light. Detailed observations reveal three features that can be attributed to organic compounds in lichens (3.41, 6.58, 8.13 μm). The feature located near 8.13 μm is a reflectance peak within the Restrahlen region of enhanced mineral reflectance. A measure of the strength of this feature and the mean reflectance in the Restrahlen region for laboratory data and SEBASS imagery reveals linear mixing trajectories between a lichen endmember and a suite of geological endmembers. This data representation enables the visualization of mixing lines, the delineation of geologically informative endmembers, and provides a means to mask pixels in imagery that encompass the greatest abundance of rock encrusting lichens therefore facilitating geological mapping. The implications for the detection of geological endmembers and mapping are discussed.

Item URL in elib:https://elib.dlr.de/80843/
Document Type:Article
Title:The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Feng, JiluUniversity of AlbertaUNSPECIFIED
Rivard, BenoitUniversity of AlbertaUNSPECIFIED
Rogge, DerekGerman Remote Sensing Data CenterUNSPECIFIED
Sánchez-Azofeifa, ArturoUniversity of AlbertaUNSPECIFIED
Date:January 2013
Journal or Publication Title:Remote Sensing of Environment
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 173-181
Keywords: Reflectance; Transmittance; Longwave; Infrared; Spectra; Lichens; SEBASS; Minerals
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Fernerkundung der Landoberfläche (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
Deposited By: Rogge, Derek
Deposited On:14 Feb 2013 09:48
Last Modified:20 Mar 2013 19:46

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