Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus
Abstract Questions Shrub encroachment has been observed in many alpine and arctic environments and is expected to significantly alter these ecosystems. Mapping these processes with remote sensing is a powerful tool for monitoring purposes. Thus, we test the distinctiveness of the reflectance signatu...
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crwiley:10.1111/avsc.12205 2024-06-23T07:50:51+00:00 Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus Magiera, Anja Feilhauer, Hannes Tephnadze, Nato Waldhardt, Rainer Otte, Annette Rocchini, Duccio Volkswagen Foundation 2015 http://dx.doi.org/10.1111/avsc.12205 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Favsc.12205 https://onlinelibrary.wiley.com/doi/pdf/10.1111/avsc.12205 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Applied Vegetation Science volume 19, issue 2, page 304-315 ISSN 1402-2001 1654-109X journal-article 2015 crwiley https://doi.org/10.1111/avsc.12205 2024-06-13T04:23:18Z Abstract Questions Shrub encroachment has been observed in many alpine and arctic environments and is expected to significantly alter these ecosystems. Mapping these processes with remote sensing is a powerful tool for monitoring purposes. Thus, we test the distinctiveness of the reflectance signature of target species relative to their co‐occurring shrub species using uni‐ and multivariate analyses for an alpine ecosystem. We ask: (i) is it possible to differentiate shrub species with a unique growth form by their reflectance signature; (ii) which of the tested multispectral sensors produces the best separation; and (iii) how are the results affected by the timing of data acquisition in the vegetation period? Location Kazbegi district, Central Greater Caucasus, Georgia. Method We analysed three shrub ( Betula litwinowii , Rhododendron caucasicum , Hippophae rhamnoides ) and one tall forb ( Veratrum lobelianum ) species occurring in the sub‐alpine to alpine belt The vegetation of 52 relevés was analysed using non‐metric multidimensional scaling and indicator species analysis. From field spectrometric data we simulated multispectral sensor bands ( IKONOS , Quickbird 2, RapidEye, WorldView‐2) directly taken from the target species. We analysed the reflectance signature in RapidEye data from June and September. For all data sets we calculated the Jeffries‐Matusita distance ( JMD ) as a separation measure and tested the reflectance signature of the single bands for differences. Results Betula litwinowii and V. lobelianum always co‐occurred in our data. A high abundance of B. litwinowii could also be found in the Rhododendron cluster and vice versa, whereas the Hippophae cluster was more homogeneous. Simulated bands showed good overall separation ( JMD 1.58–2.00) of the target species. The separation increased with the increase of number of bands and inclusion of the red edge band. There was a general trend in which the reflectance from satellite images produced a lower separation ( JMD 1.20–1.55) than the ... Article in Journal/Newspaper Arctic Wiley Online Library Arctic Applied Vegetation Science 19 2 304 315 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Questions Shrub encroachment has been observed in many alpine and arctic environments and is expected to significantly alter these ecosystems. Mapping these processes with remote sensing is a powerful tool for monitoring purposes. Thus, we test the distinctiveness of the reflectance signature of target species relative to their co‐occurring shrub species using uni‐ and multivariate analyses for an alpine ecosystem. We ask: (i) is it possible to differentiate shrub species with a unique growth form by their reflectance signature; (ii) which of the tested multispectral sensors produces the best separation; and (iii) how are the results affected by the timing of data acquisition in the vegetation period? Location Kazbegi district, Central Greater Caucasus, Georgia. Method We analysed three shrub ( Betula litwinowii , Rhododendron caucasicum , Hippophae rhamnoides ) and one tall forb ( Veratrum lobelianum ) species occurring in the sub‐alpine to alpine belt The vegetation of 52 relevés was analysed using non‐metric multidimensional scaling and indicator species analysis. From field spectrometric data we simulated multispectral sensor bands ( IKONOS , Quickbird 2, RapidEye, WorldView‐2) directly taken from the target species. We analysed the reflectance signature in RapidEye data from June and September. For all data sets we calculated the Jeffries‐Matusita distance ( JMD ) as a separation measure and tested the reflectance signature of the single bands for differences. Results Betula litwinowii and V. lobelianum always co‐occurred in our data. A high abundance of B. litwinowii could also be found in the Rhododendron cluster and vice versa, whereas the Hippophae cluster was more homogeneous. Simulated bands showed good overall separation ( JMD 1.58–2.00) of the target species. The separation increased with the increase of number of bands and inclusion of the red edge band. There was a general trend in which the reflectance from satellite images produced a lower separation ( JMD 1.20–1.55) than the ... |
author2 |
Rocchini, Duccio Volkswagen Foundation |
format |
Article in Journal/Newspaper |
author |
Magiera, Anja Feilhauer, Hannes Tephnadze, Nato Waldhardt, Rainer Otte, Annette |
spellingShingle |
Magiera, Anja Feilhauer, Hannes Tephnadze, Nato Waldhardt, Rainer Otte, Annette Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus |
author_facet |
Magiera, Anja Feilhauer, Hannes Tephnadze, Nato Waldhardt, Rainer Otte, Annette |
author_sort |
Magiera, Anja |
title |
Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus |
title_short |
Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus |
title_full |
Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus |
title_fullStr |
Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus |
title_full_unstemmed |
Separating reflectance signatures of shrub species – a case study in the Central Greater Caucasus |
title_sort |
separating reflectance signatures of shrub species – a case study in the central greater caucasus |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1111/avsc.12205 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Favsc.12205 https://onlinelibrary.wiley.com/doi/pdf/10.1111/avsc.12205 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Applied Vegetation Science volume 19, issue 2, page 304-315 ISSN 1402-2001 1654-109X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/avsc.12205 |
container_title |
Applied Vegetation Science |
container_volume |
19 |
container_issue |
2 |
container_start_page |
304 |
op_container_end_page |
315 |
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1802641789907107840 |