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| Titel |
Upscaling reflectance information of lichens and mosses using a singularity index: a case study of the Hudson Bay Lowlands, Canada |
| VerfasserIn |
T. Neta, Q. Cheng, R. L. Bello, B. Hu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 8 ; Nr. 7, no. 8 (2010-08-27), S.2557-2565 |
| Datensatznummer |
250004939
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| Publikation (Nr.) |
 copernicus.org/bg-7-2557-2010.pdf |
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| Zusammenfassung |
| Assessing moisture contents of lichens and mosses using ground-based high spectral
resolution spectrometers (400–2500 nm) offers immense opportunities for a comprehensive
monitoring of peatland moisture status by satellite/airborne imagery. This information
may be valuable for present and future carbon balance modeling. Previous studies are
based upon point measurements of vegetation moisture content and water table position,
and therefore a detailed moisture status of entire northern peatlands is not available.
Consequently, upscaling ground and remotely sensed data to the desired spatial resolutions
is inevitable. This study continues our previous investigation of the impact of various moisture
conditions of common sub-Arctic lichen and moss species (i.e., Cladina stellaris, Cladina rangiferina,
Dicranum elongatum, and Tomenthypnum nitens) upon the spectral signatures obtained in the Hudson
Bay Lowlands, Canada. Upscaling reflectance measurements of the above species were conducted in the
field, and reflectance analysis using a singularity index was made, since this study serves as a
basis for future aircraft/satellite research. An attempt to upscale current and new spectral
reflectance indices developed in our previous studies was made as well. Our findings indicate
that the spectral index C. rangiferina is to a lesser amount influenced by scale since it has a
small R2 values between the log of the index and the log of the resolution, reduced slopes
between the log of the index and the log of the resolution, and similar slopes between log
reflectance and log resolution (α) of two wavelengths employed by the index. Future study should
focus on concurrent monitoring of moisture variations in lichens and mosses both in situ and from
satellite and airborne images, as well as analysis of fractal models in relations to the upscaling
experiments. |
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