The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery
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 obscur...
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Online Access: | https://elib.dlr.de/80843/ https://doi.org/10.1016/j.rse.2012.12.018 |
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ftdlr:oai:elib.dlr.de:80843 2023-07-16T03:57:05+02:00 The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery Feng, Jilu Rivard, Benoit Rogge, Derek Sánchez-Azofeifa, Arturo 2013-01 https://elib.dlr.de/80843/ https://doi.org/10.1016/j.rse.2012.12.018 unknown Elsevier Feng, Jilu und Rivard, Benoit und Rogge, Derek und 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, Seiten 173-181. Elsevier. doi:10.1016/j.rse.2012.12.018 <https://doi.org/10.1016/j.rse.2012.12.018>. Landoberfläche Zeitschriftenbeitrag PeerReviewed 2013 ftdlr https://doi.org/10.1016/j.rse.2012.12.018 2023-06-27T08:27:59Z 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. Article in Journal/Newspaper Arctic Subarctic German Aerospace Center: elib - DLR electronic library Arctic Cape Smith ENVELOPE(-62.520,-62.520,-62.981,-62.981) Remote Sensing of Environment 131 173 181 |
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Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
unknown |
topic |
Landoberfläche |
spellingShingle |
Landoberfläche Feng, Jilu Rivard, Benoit Rogge, Derek Sánchez-Azofeifa, Arturo The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery |
topic_facet |
Landoberfläche |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Feng, Jilu Rivard, Benoit Rogge, Derek Sánchez-Azofeifa, Arturo |
author_facet |
Feng, Jilu Rivard, Benoit Rogge, Derek Sánchez-Azofeifa, Arturo |
author_sort |
Feng, Jilu |
title |
The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery |
title_short |
The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery |
title_full |
The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery |
title_fullStr |
The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery |
title_full_unstemmed |
The longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne SEBASS imagery |
title_sort |
longwave infrared (3–14μm) spectral properties of rock encrusting lichens based on laboratory spectra and airborne sebass imagery |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://elib.dlr.de/80843/ https://doi.org/10.1016/j.rse.2012.12.018 |
long_lat |
ENVELOPE(-62.520,-62.520,-62.981,-62.981) |
geographic |
Arctic Cape Smith |
geographic_facet |
Arctic Cape Smith |
genre |
Arctic Subarctic |
genre_facet |
Arctic Subarctic |
op_relation |
Feng, Jilu und Rivard, Benoit und Rogge, Derek und 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, Seiten 173-181. Elsevier. doi:10.1016/j.rse.2012.12.018 <https://doi.org/10.1016/j.rse.2012.12.018>. |
op_doi |
https://doi.org/10.1016/j.rse.2012.12.018 |
container_title |
Remote Sensing of Environment |
container_volume |
131 |
container_start_page |
173 |
op_container_end_page |
181 |
_version_ |
1771543606788620288 |