Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band
Shrub encroachment into grassland and rocky habitats is a noticeable land cover change currently underway in temperate mountains and is a matter of concern for the sustainable management of mountain biodiversity. Current land cover products tend to underestimate the extent of mountain shrublands dom...
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ftmdpi:oai:mdpi.com:/2072-4292/11/23/2807/ 2023-08-20T04:04:50+02:00 Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band Arthur Bayle Bradley Carlson Vincent Thierion Marc Isenmann Philippe Choler agris 2019-11-27 application/pdf https://doi.org/10.3390/rs11232807 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/rs11232807 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 11; Issue 23; Pages: 2807 optical remote sensing anthocyanin dwarf shrubs European Alps land cover mapping NARI Text 2019 ftmdpi https://doi.org/10.3390/rs11232807 2023-07-31T22:50:14Z Shrub encroachment into grassland and rocky habitats is a noticeable land cover change currently underway in temperate mountains and is a matter of concern for the sustainable management of mountain biodiversity. Current land cover products tend to underestimate the extent of mountain shrublands dominated by Ericaceae (Vaccinium spp. (species) and Rhododendron ferrugineum). In addition, mountain shrubs are often confounded with grasslands. Here, we examined the potential of anthocyanin-responsive vegetation indices to provide more accurate maps of mountain shrublands in a mountain range located in the French Alps. We relied on the multi-spectral instrument onboard the Sentinel-2A and 2B satellites and the availability of red-edge bands to calculate a Normalized Anthocyanin Reflectance Index (NARI). We used this index to quantify the autumn accumulation of anthocyanin in canopies dominated by Vaccinium spp. and Rhododendron ferrugineum and compared the effectiveness of NARI to Normalized Difference Vegetation Index (NDVI) as a basis for shrubland mapping. Photointerpretation of high-resolution aerial imagery, intensive field campaigns, and floristic surveys provided complementary data to calibrate and evaluate model performance. The proposed NARI-based model performed better than the NDVI-based model with an area under the curve (AUC) of 0.92 against 0.58. Validation of shrub cover maps based on NARI resulted in a Kappa coefficient of 0.67, which outperformed existing land cover products and resulted in a ten-fold increase in estimated area occupied by Ericaceae-dominated shrublands. We conclude that the Sentinel-2 red-edge band provides novel opportunities to detect seasonal anthocyanin accumulation in plant canopies and discuss the potential of our method to quantify long-term dynamics of shrublands in alpine and arctic contexts. Text Arctic MDPI Open Access Publishing Arctic The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) Remote Sensing 11 23 2807 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
optical remote sensing anthocyanin dwarf shrubs European Alps land cover mapping NARI |
spellingShingle |
optical remote sensing anthocyanin dwarf shrubs European Alps land cover mapping NARI Arthur Bayle Bradley Carlson Vincent Thierion Marc Isenmann Philippe Choler Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band |
topic_facet |
optical remote sensing anthocyanin dwarf shrubs European Alps land cover mapping NARI |
description |
Shrub encroachment into grassland and rocky habitats is a noticeable land cover change currently underway in temperate mountains and is a matter of concern for the sustainable management of mountain biodiversity. Current land cover products tend to underestimate the extent of mountain shrublands dominated by Ericaceae (Vaccinium spp. (species) and Rhododendron ferrugineum). In addition, mountain shrubs are often confounded with grasslands. Here, we examined the potential of anthocyanin-responsive vegetation indices to provide more accurate maps of mountain shrublands in a mountain range located in the French Alps. We relied on the multi-spectral instrument onboard the Sentinel-2A and 2B satellites and the availability of red-edge bands to calculate a Normalized Anthocyanin Reflectance Index (NARI). We used this index to quantify the autumn accumulation of anthocyanin in canopies dominated by Vaccinium spp. and Rhododendron ferrugineum and compared the effectiveness of NARI to Normalized Difference Vegetation Index (NDVI) as a basis for shrubland mapping. Photointerpretation of high-resolution aerial imagery, intensive field campaigns, and floristic surveys provided complementary data to calibrate and evaluate model performance. The proposed NARI-based model performed better than the NDVI-based model with an area under the curve (AUC) of 0.92 against 0.58. Validation of shrub cover maps based on NARI resulted in a Kappa coefficient of 0.67, which outperformed existing land cover products and resulted in a ten-fold increase in estimated area occupied by Ericaceae-dominated shrublands. We conclude that the Sentinel-2 red-edge band provides novel opportunities to detect seasonal anthocyanin accumulation in plant canopies and discuss the potential of our method to quantify long-term dynamics of shrublands in alpine and arctic contexts. |
format |
Text |
author |
Arthur Bayle Bradley Carlson Vincent Thierion Marc Isenmann Philippe Choler |
author_facet |
Arthur Bayle Bradley Carlson Vincent Thierion Marc Isenmann Philippe Choler |
author_sort |
Arthur Bayle |
title |
Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band |
title_short |
Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band |
title_full |
Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band |
title_fullStr |
Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band |
title_full_unstemmed |
Improved Mapping of Mountain Shrublands Using the Sentinel-2 Red-Edge Band |
title_sort |
improved mapping of mountain shrublands using the sentinel-2 red-edge band |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2019 |
url |
https://doi.org/10.3390/rs11232807 |
op_coverage |
agris |
long_lat |
ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Arctic The Sentinel |
geographic_facet |
Arctic The Sentinel |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Remote Sensing; Volume 11; Issue 23; Pages: 2807 |
op_relation |
https://dx.doi.org/10.3390/rs11232807 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs11232807 |
container_title |
Remote Sensing |
container_volume |
11 |
container_issue |
23 |
container_start_page |
2807 |
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1774715255964827648 |