Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis
In polar regions, vegetation is especially sensitive to climate dynamics and thus can be used as an indicator of the global and regional environmental change. However, in Antarctica, there is very little information on vegetation distribution and growth status. To fill this gap, we evaluated the abi...
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2021
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Online Access: | https://doi.org/10.3390/rs13020166 https://doaj.org/article/52053930a8be475ca1bfbf6e8ad1c3ae |
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ftdoajarticles:oai:doaj.org/article:52053930a8be475ca1bfbf6e8ad1c3ae 2024-01-07T09:40:02+01:00 Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis Xiaohui Sun Wenjin Wu Xinwu Li Xiyan Xu Jinfeng Li 2021-01-01T00:00:00Z https://doi.org/10.3390/rs13020166 https://doaj.org/article/52053930a8be475ca1bfbf6e8ad1c3ae EN eng MDPI AG https://www.mdpi.com/2072-4292/13/2/166 https://doaj.org/toc/2072-4292 doi:10.3390/rs13020166 2072-4292 https://doaj.org/article/52053930a8be475ca1bfbf6e8ad1c3ae Remote Sensing, Vol 13, Iss 2, p 166 (2021) Antarctica vegetation abundance WorldView-2 spectral mixture analysis moss health evaluation Science Q article 2021 ftdoajarticles https://doi.org/10.3390/rs13020166 2023-12-10T01:48:36Z In polar regions, vegetation is especially sensitive to climate dynamics and thus can be used as an indicator of the global and regional environmental change. However, in Antarctica, there is very little information on vegetation distribution and growth status. To fill this gap, we evaluated the ability of both linear and nonlinear spectral mixture analysis (SMA) models, including a group of newly developed modified Nascimento’s models for Antarctic vegetated areas (MNM-AVs), in estimating the abundance of major Antarctic vegetation types, i.e., mosses and lichens. The study was conducted using WorldView-2 satellite data and field measurements over the Fildes Peninsula and its surroundings, which are representative vegetated areas in Antarctica. In MNM-AVs, we introduced secondary scattering components for vegetation and its background to account for the sparsity of vegetation cover and reassigned their coefficients. The new models achieved improved performances, among which MNM-AV3 achieved the lowest error for mosses (lichens) abundance estimation with RMSE = 0.202 (0.213). Compared with MNM-AVs, the linear model performed particularly poor for lichens (RMSE = 0.322), which is in contrast to the case of mosses (RMSE = 0.212), demonstrating that spectral signals of lichens are more prone to mix with their backgrounds. Abundance maps of mosses and lichens, as well as a map of moss health status for the entire study area, were then obtained based on MNM-AV3 with around 80% overall accuracy. Moss areas account for 0.7695 km 2 in Fildes and 0.3259 km 2 in Ardley Island; unhealthy mosses amounted to 40% (49%) of the area in the summer of 2018 (2019), indicating considerable environmental stress. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ardley Island Directory of Open Access Journals: DOAJ Articles Antarctic Ardley ENVELOPE(-58.953,-58.953,-62.201,-62.201) Ardley Island ENVELOPE(-58.933,-58.933,-62.213,-62.213) Fildes ENVELOPE(-58.817,-58.817,-62.217,-62.217) Fildes peninsula ENVELOPE(-58.948,-58.948,-62.182,-62.182) Remote Sensing 13 2 166 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctica vegetation abundance WorldView-2 spectral mixture analysis moss health evaluation Science Q |
spellingShingle |
Antarctica vegetation abundance WorldView-2 spectral mixture analysis moss health evaluation Science Q Xiaohui Sun Wenjin Wu Xinwu Li Xiyan Xu Jinfeng Li Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis |
topic_facet |
Antarctica vegetation abundance WorldView-2 spectral mixture analysis moss health evaluation Science Q |
description |
In polar regions, vegetation is especially sensitive to climate dynamics and thus can be used as an indicator of the global and regional environmental change. However, in Antarctica, there is very little information on vegetation distribution and growth status. To fill this gap, we evaluated the ability of both linear and nonlinear spectral mixture analysis (SMA) models, including a group of newly developed modified Nascimento’s models for Antarctic vegetated areas (MNM-AVs), in estimating the abundance of major Antarctic vegetation types, i.e., mosses and lichens. The study was conducted using WorldView-2 satellite data and field measurements over the Fildes Peninsula and its surroundings, which are representative vegetated areas in Antarctica. In MNM-AVs, we introduced secondary scattering components for vegetation and its background to account for the sparsity of vegetation cover and reassigned their coefficients. The new models achieved improved performances, among which MNM-AV3 achieved the lowest error for mosses (lichens) abundance estimation with RMSE = 0.202 (0.213). Compared with MNM-AVs, the linear model performed particularly poor for lichens (RMSE = 0.322), which is in contrast to the case of mosses (RMSE = 0.212), demonstrating that spectral signals of lichens are more prone to mix with their backgrounds. Abundance maps of mosses and lichens, as well as a map of moss health status for the entire study area, were then obtained based on MNM-AV3 with around 80% overall accuracy. Moss areas account for 0.7695 km 2 in Fildes and 0.3259 km 2 in Ardley Island; unhealthy mosses amounted to 40% (49%) of the area in the summer of 2018 (2019), indicating considerable environmental stress. |
format |
Article in Journal/Newspaper |
author |
Xiaohui Sun Wenjin Wu Xinwu Li Xiyan Xu Jinfeng Li |
author_facet |
Xiaohui Sun Wenjin Wu Xinwu Li Xiyan Xu Jinfeng Li |
author_sort |
Xiaohui Sun |
title |
Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis |
title_short |
Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis |
title_full |
Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis |
title_fullStr |
Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis |
title_full_unstemmed |
Vegetation Abundance and Health Mapping Over Southwestern Antarctica Based on WorldView-2 Data and a Modified Spectral Mixture Analysis |
title_sort |
vegetation abundance and health mapping over southwestern antarctica based on worldview-2 data and a modified spectral mixture analysis |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/rs13020166 https://doaj.org/article/52053930a8be475ca1bfbf6e8ad1c3ae |
long_lat |
ENVELOPE(-58.953,-58.953,-62.201,-62.201) ENVELOPE(-58.933,-58.933,-62.213,-62.213) ENVELOPE(-58.817,-58.817,-62.217,-62.217) ENVELOPE(-58.948,-58.948,-62.182,-62.182) |
geographic |
Antarctic Ardley Ardley Island Fildes Fildes peninsula |
geographic_facet |
Antarctic Ardley Ardley Island Fildes Fildes peninsula |
genre |
Antarc* Antarctic Antarctica Ardley Island |
genre_facet |
Antarc* Antarctic Antarctica Ardley Island |
op_source |
Remote Sensing, Vol 13, Iss 2, p 166 (2021) |
op_relation |
https://www.mdpi.com/2072-4292/13/2/166 https://doaj.org/toc/2072-4292 doi:10.3390/rs13020166 2072-4292 https://doaj.org/article/52053930a8be475ca1bfbf6e8ad1c3ae |
op_doi |
https://doi.org/10.3390/rs13020166 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
2 |
container_start_page |
166 |
_version_ |
1787430391998578688 |