Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation
Expansion of Antarctic vegetation in ice-free areas underlines the need for effective remote sensing techniques to properly monitor the changes. Detection and mapping of vegetation remains limited in the Antarctic environment given the complexity of its surface coverage. Some cryptogamic species exh...
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Online Access: | http://hdl.handle.net/10451/44561 https://doi.org/10.1016/j.apgeog.2020.102322 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/44561 2023-05-15T13:59:03+02:00 Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation Sotille, Maria E. Bremer, Ulisses F. Vieira, Gonçalo Velho, Luiz F. Petsch, Carina Simões, Jefferson C. 2020-10-12T11:54:45Z http://hdl.handle.net/10451/44561 https://doi.org/10.1016/j.apgeog.2020.102322 eng eng Elsevier https://www.sciencedirect.com/science/article/pii/S0143622819313554?via%3Dihub Sotille, M. E., Bremer, U. F., Vieira, G., Velho, L. F., Petsch, C. & Simões, J. C. (2020). Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation. Applied Geography, 125, 102322. https://doi.org/10.1016/j.apgeog.2020.102322 0143-6228 http://hdl.handle.net/10451/44561 doi:10.1016/j.apgeog.2020.102322 closedAccess Vegetation mapping NDVI Antarctica UAV Landsat Sentinel-2 Remote sensing article 2020 ftunivlisboa https://doi.org/10.1016/j.apgeog.2020.102322 2023-03-01T01:08:16Z Expansion of Antarctic vegetation in ice-free areas underlines the need for effective remote sensing techniques to properly monitor the changes. Detection and mapping of vegetation remains limited in the Antarctic environment given the complexity of its surface coverage. Some cryptogamic species exhibit low reflectance in the nearinfrared region and are not easily detected by vegetation indices, such as the normalized difference vegetation index (NDVI). In addition, spectral reflectance of Antarctic vegetation is highly variable according to seasonal conditions, which may influence NDVI results. As ultra-high resolution aerial imagery allows for a detailed analysis of vegetation and enables the validation of satellite imagery, in this study we assess the ability of the NDVI from unmanned aerial vehicle (UAV), Sentinel-2, and Landsat 8 to identify vegetated areas in the ice-free environment of Hope Bay, Antarctic Peninsula. NDVI classification with class ranges set by statistical parameters (i.e., mean and standard deviation) is performed. The results show that different sensors provide different NDVI values for the same vegetation class. NDVI classification enabled the identification of areas showing vegetation cover, which are in accordance with the manually mapped areas in the UAV image. Correspondence in vegetation distribution and classes can be observed across all classifications, demonstrating that aerial and satellite imagery may be used for Antarctic vegetation monitoring. A close association between NDVI classes and Antarctic vegetation type is identified, where lichens are generally classified in lower probability classes, and algae and moss in higher probability classes. This article shows the potential of NDVI applied to Antarctic vegetation and the significance of data statistical parameters in the selection of thresholds, reducing the need for groundtruth information in remote areas. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Universidade de Lisboa: repositório.UL Antarctic Antarctic Peninsula Hope Bay ENVELOPE(-57.038,-57.038,-63.403,-63.403) The Antarctic Applied Geography 125 102322 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Vegetation mapping NDVI Antarctica UAV Landsat Sentinel-2 Remote sensing |
spellingShingle |
Vegetation mapping NDVI Antarctica UAV Landsat Sentinel-2 Remote sensing Sotille, Maria E. Bremer, Ulisses F. Vieira, Gonçalo Velho, Luiz F. Petsch, Carina Simões, Jefferson C. Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation |
topic_facet |
Vegetation mapping NDVI Antarctica UAV Landsat Sentinel-2 Remote sensing |
description |
Expansion of Antarctic vegetation in ice-free areas underlines the need for effective remote sensing techniques to properly monitor the changes. Detection and mapping of vegetation remains limited in the Antarctic environment given the complexity of its surface coverage. Some cryptogamic species exhibit low reflectance in the nearinfrared region and are not easily detected by vegetation indices, such as the normalized difference vegetation index (NDVI). In addition, spectral reflectance of Antarctic vegetation is highly variable according to seasonal conditions, which may influence NDVI results. As ultra-high resolution aerial imagery allows for a detailed analysis of vegetation and enables the validation of satellite imagery, in this study we assess the ability of the NDVI from unmanned aerial vehicle (UAV), Sentinel-2, and Landsat 8 to identify vegetated areas in the ice-free environment of Hope Bay, Antarctic Peninsula. NDVI classification with class ranges set by statistical parameters (i.e., mean and standard deviation) is performed. The results show that different sensors provide different NDVI values for the same vegetation class. NDVI classification enabled the identification of areas showing vegetation cover, which are in accordance with the manually mapped areas in the UAV image. Correspondence in vegetation distribution and classes can be observed across all classifications, demonstrating that aerial and satellite imagery may be used for Antarctic vegetation monitoring. A close association between NDVI classes and Antarctic vegetation type is identified, where lichens are generally classified in lower probability classes, and algae and moss in higher probability classes. This article shows the potential of NDVI applied to Antarctic vegetation and the significance of data statistical parameters in the selection of thresholds, reducing the need for groundtruth information in remote areas. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Sotille, Maria E. Bremer, Ulisses F. Vieira, Gonçalo Velho, Luiz F. Petsch, Carina Simões, Jefferson C. |
author_facet |
Sotille, Maria E. Bremer, Ulisses F. Vieira, Gonçalo Velho, Luiz F. Petsch, Carina Simões, Jefferson C. |
author_sort |
Sotille, Maria E. |
title |
Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation |
title_short |
Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation |
title_full |
Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation |
title_fullStr |
Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation |
title_full_unstemmed |
Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation |
title_sort |
evaluation of uav and satellite-derived ndvi to map maritime antarctic vegetation |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/10451/44561 https://doi.org/10.1016/j.apgeog.2020.102322 |
long_lat |
ENVELOPE(-57.038,-57.038,-63.403,-63.403) |
geographic |
Antarctic Antarctic Peninsula Hope Bay The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Hope Bay The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica |
op_relation |
https://www.sciencedirect.com/science/article/pii/S0143622819313554?via%3Dihub Sotille, M. E., Bremer, U. F., Vieira, G., Velho, L. F., Petsch, C. & Simões, J. C. (2020). Evaluation of UAV and satellite-derived NDVI to map maritime Antarctic vegetation. Applied Geography, 125, 102322. https://doi.org/10.1016/j.apgeog.2020.102322 0143-6228 http://hdl.handle.net/10451/44561 doi:10.1016/j.apgeog.2020.102322 |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.1016/j.apgeog.2020.102322 |
container_title |
Applied Geography |
container_volume |
125 |
container_start_page |
102322 |
_version_ |
1766267420850257920 |