Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys
Mapping accurately vegetation surfaces in space and time in the ice-free areas of Antarctica can provide important information to quantitatively describe the evolution of their ecosystems. Spaceborne remote sensing is the adequate way to map and evaluate multitemporal changes on the Antarctic vegeta...
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Online Access: | http://hdl.handle.net/10451/42667 https://doi.org/10.1016/j.scitotenv.2019.135295 |
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ftunivlisboa:oai:repositorio.ul.pt:10451/42667 2023-05-15T13:36:26+02:00 Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys Miranda, Vasco Pina, Pedro Heleno, Sandra Vieira, Gonçalo Mora, Carla E.G.R. Schaefer, Carlos 2020-04-01T15:50:10Z http://hdl.handle.net/10451/42667 https://doi.org/10.1016/j.scitotenv.2019.135295 eng eng Elsevier UID/ECI/04028/2019 UID/GEO/00295/2019 Portuguese Polar Program (PROPOLAR) through research campaign project CIRCLAR in 2016-2017 Portuguese Polar Program (PROPOLAR) through research campaign project SNOWCHANGE in 2011-2012 Miranda, V., Pina, P., Heleno, S., Vieira, G., Mora, C., & E.G.R. Schaefer, C. (2020). Monitoring recent changes of vegetation in fildes peninsula (king george island, antarctica) through satellite imagery guided by UAV surveys. Science of the Total Environment, 704:135295. doi:10.1016/j.scitotenv.2019.135295 0048-9697 http://hdl.handle.net/10451/42667 doi:10.1016/j.scitotenv.2019.135295 1879-1026 closedAccess Antarctic Regions Bryophyta Ecosystem Environmental Monitoring Islands Lichens Snow Satellite Imagery article 2020 ftunivlisboa https://doi.org/10.1016/j.scitotenv.2019.135295 2022-05-25T18:41:12Z Mapping accurately vegetation surfaces in space and time in the ice-free areas of Antarctica can provide important information to quantitatively describe the evolution of their ecosystems. Spaceborne remote sensing is the adequate way to map and evaluate multitemporal changes on the Antarctic vegetation at large but its nature of occurrence, in relatively small and sparse patches, makes the identification very challenging. The inclusion of an intermediate scale of observation between ground and satellite scales, provided by Unmanned Aerial Vehicles (UAV) imagery, is of great help not only for their effective classification, but also for discriminating their main communities (lichens and mosses). Thus, this paper quantifies accurately recent changes of the vegetated areas in Fildes Peninsula (King George Island, Antarctica) through a novel methodology based on the integration of multiplatform data (satellite and UAV). It consists of multiscale imagery (spatial resolution of 2 m and 2 cm) from the same period to create a robust classifier that, after intensive calibration, is adequately used in other dates, where field reference data is scarce or not available at all. The methodology is developed and tested with UAV and satellite data from 2017 showing overall accuracies of 96% and kappa equal to 0.94 with a SVM classifier. These high performances allow the extrapolation to a pair of previous dates, 2006 and 2013, when atmospherically clear very high-resolution satellite imagery are available. The classification allows verifying a loss of the total area of vegetation of 4.5% during the 11-year time period under analysis, which corresponds to a 10.3% reduction for Usnea sp. and 9.8% for moss formations. Nevertheless, the breakdown analysis by time period shows a distinct behaviour for each vegetation type which are evaluated and discussed, namely for Usnea sp. whose decline is likely to be related to changing snow conditions. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctica King George Island Universidade de Lisboa: repositório.UL Antarctic The Antarctic King George Island Fildes ENVELOPE(-58.817,-58.817,-62.217,-62.217) Fildes peninsula ENVELOPE(-58.948,-58.948,-62.182,-62.182) Science of The Total Environment 704 135295 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Antarctic Regions Bryophyta Ecosystem Environmental Monitoring Islands Lichens Snow Satellite Imagery |
spellingShingle |
Antarctic Regions Bryophyta Ecosystem Environmental Monitoring Islands Lichens Snow Satellite Imagery Miranda, Vasco Pina, Pedro Heleno, Sandra Vieira, Gonçalo Mora, Carla E.G.R. Schaefer, Carlos Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys |
topic_facet |
Antarctic Regions Bryophyta Ecosystem Environmental Monitoring Islands Lichens Snow Satellite Imagery |
description |
Mapping accurately vegetation surfaces in space and time in the ice-free areas of Antarctica can provide important information to quantitatively describe the evolution of their ecosystems. Spaceborne remote sensing is the adequate way to map and evaluate multitemporal changes on the Antarctic vegetation at large but its nature of occurrence, in relatively small and sparse patches, makes the identification very challenging. The inclusion of an intermediate scale of observation between ground and satellite scales, provided by Unmanned Aerial Vehicles (UAV) imagery, is of great help not only for their effective classification, but also for discriminating their main communities (lichens and mosses). Thus, this paper quantifies accurately recent changes of the vegetated areas in Fildes Peninsula (King George Island, Antarctica) through a novel methodology based on the integration of multiplatform data (satellite and UAV). It consists of multiscale imagery (spatial resolution of 2 m and 2 cm) from the same period to create a robust classifier that, after intensive calibration, is adequately used in other dates, where field reference data is scarce or not available at all. The methodology is developed and tested with UAV and satellite data from 2017 showing overall accuracies of 96% and kappa equal to 0.94 with a SVM classifier. These high performances allow the extrapolation to a pair of previous dates, 2006 and 2013, when atmospherically clear very high-resolution satellite imagery are available. The classification allows verifying a loss of the total area of vegetation of 4.5% during the 11-year time period under analysis, which corresponds to a 10.3% reduction for Usnea sp. and 9.8% for moss formations. Nevertheless, the breakdown analysis by time period shows a distinct behaviour for each vegetation type which are evaluated and discussed, namely for Usnea sp. whose decline is likely to be related to changing snow conditions. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Miranda, Vasco Pina, Pedro Heleno, Sandra Vieira, Gonçalo Mora, Carla E.G.R. Schaefer, Carlos |
author_facet |
Miranda, Vasco Pina, Pedro Heleno, Sandra Vieira, Gonçalo Mora, Carla E.G.R. Schaefer, Carlos |
author_sort |
Miranda, Vasco |
title |
Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys |
title_short |
Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys |
title_full |
Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys |
title_fullStr |
Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys |
title_full_unstemmed |
Monitoring recent changes of vegetation in Fildes Peninsula (King George Island, Antarctica) through satellite imagery guided by UAV surveys |
title_sort |
monitoring recent changes of vegetation in fildes peninsula (king george island, antarctica) through satellite imagery guided by uav surveys |
publisher |
Elsevier |
publishDate |
2020 |
url |
http://hdl.handle.net/10451/42667 https://doi.org/10.1016/j.scitotenv.2019.135295 |
long_lat |
ENVELOPE(-58.817,-58.817,-62.217,-62.217) ENVELOPE(-58.948,-58.948,-62.182,-62.182) |
geographic |
Antarctic The Antarctic King George Island Fildes Fildes peninsula |
geographic_facet |
Antarctic The Antarctic King George Island Fildes Fildes peninsula |
genre |
Antarc* Antarctic Antarctica King George Island |
genre_facet |
Antarc* Antarctic Antarctica King George Island |
op_relation |
UID/ECI/04028/2019 UID/GEO/00295/2019 Portuguese Polar Program (PROPOLAR) through research campaign project CIRCLAR in 2016-2017 Portuguese Polar Program (PROPOLAR) through research campaign project SNOWCHANGE in 2011-2012 Miranda, V., Pina, P., Heleno, S., Vieira, G., Mora, C., & E.G.R. Schaefer, C. (2020). Monitoring recent changes of vegetation in fildes peninsula (king george island, antarctica) through satellite imagery guided by UAV surveys. Science of the Total Environment, 704:135295. doi:10.1016/j.scitotenv.2019.135295 0048-9697 http://hdl.handle.net/10451/42667 doi:10.1016/j.scitotenv.2019.135295 1879-1026 |
op_rights |
closedAccess |
op_doi |
https://doi.org/10.1016/j.scitotenv.2019.135295 |
container_title |
Science of The Total Environment |
container_volume |
704 |
container_start_page |
135295 |
_version_ |
1766078387371114496 |