Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation
Antarctic moss communities, found in the spatially fragmented and fragile moss beds, can serve as indicators of the regional impacts of climate change. Unmanned aerial systems (UAS) carrying visible and near infrared (VNIR) sensors are a suitable nonintrusive mapping platform. UAS deployments in Ant...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Research Online
2019
|
Subjects: | |
Online Access: | https://ro.uow.edu.au/smhpapers1/926 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1940&context=smhpapers1 |
id |
ftunivwollongong:oai:ro.uow.edu.au:smhpapers1-1940 |
---|---|
record_format |
openpolar |
spelling |
ftunivwollongong:oai:ro.uow.edu.au:smhpapers1-1940 2023-05-15T13:49:58+02:00 Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation Turner, Darren Malenovky, Zbynek Lucieer, Arko Turnbull, Johanna Robinson, Sharon A 2019-01-01T08:00:00Z application/pdf https://ro.uow.edu.au/smhpapers1/926 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1940&context=smhpapers1 unknown Research Online https://ro.uow.edu.au/smhpapers1/926 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1940&context=smhpapers1 Faculty of Science, Medicine and Health - Papers: Part B antarctic spectral optimizing monitoring sensors imaging system aerial unmanned resolutions vegetation spatial article 2019 ftunivwollongong 2022-06-13T22:23:28Z Antarctic moss communities, found in the spatially fragmented and fragile moss beds, can serve as indicators of the regional impacts of climate change. Unmanned aerial systems (UAS) carrying visible and near infrared (VNIR) sensors are a suitable nonintrusive mapping platform. UAS deployments in Antarctica are, due to weather and logistical restrictions, infrequent and short, thus it is essential that field time is optimized. This article identified the optimal spectral and spatial resolution of the UAS-based sensors to facilitate efficient data acquisition without jeopardizing the accuracy of remotely sensed moss health indicators. A hyperspectral line scanner was used to collect imagery of two moss study sites near the Casey Australian Antarctic base. The spectral and spatial data degradation simulated two lightweight sensors that could be used for more efficient spectral image acquisition in the future. These simulations revealed that the spectral quality deteriorated more definitively at the spatial resolution where moss spectra started to mix with spectra of surrounding rocks. Subsequently, random forest models (RFMs) were trained with lab measurements for predicting chlorophyll content and effective leaf density. The RFMs were applied to the UAS imagery of the reduced spectral and spatial resolutions to quantify decline in accuracy of both indicators. We identified the optimal UAS sensor capable of mapping a relatively large moss bed (∼5 ha) with the prediction accuracy similar to the hyperspectral system. This sensor would be a frame camera acquiring 25 VNIR spectral bands at a spatial resolution of 8 cm. This developed methodology has the potential to be adopted for other similar vegetation biophysical/chemical plant traits. Article in Journal/Newspaper Antarc* Antarctic Antarctica University of Wollongong, Australia: Research Online Antarctic |
institution |
Open Polar |
collection |
University of Wollongong, Australia: Research Online |
op_collection_id |
ftunivwollongong |
language |
unknown |
topic |
antarctic spectral optimizing monitoring sensors imaging system aerial unmanned resolutions vegetation spatial |
spellingShingle |
antarctic spectral optimizing monitoring sensors imaging system aerial unmanned resolutions vegetation spatial Turner, Darren Malenovky, Zbynek Lucieer, Arko Turnbull, Johanna Robinson, Sharon A Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation |
topic_facet |
antarctic spectral optimizing monitoring sensors imaging system aerial unmanned resolutions vegetation spatial |
description |
Antarctic moss communities, found in the spatially fragmented and fragile moss beds, can serve as indicators of the regional impacts of climate change. Unmanned aerial systems (UAS) carrying visible and near infrared (VNIR) sensors are a suitable nonintrusive mapping platform. UAS deployments in Antarctica are, due to weather and logistical restrictions, infrequent and short, thus it is essential that field time is optimized. This article identified the optimal spectral and spatial resolution of the UAS-based sensors to facilitate efficient data acquisition without jeopardizing the accuracy of remotely sensed moss health indicators. A hyperspectral line scanner was used to collect imagery of two moss study sites near the Casey Australian Antarctic base. The spectral and spatial data degradation simulated two lightweight sensors that could be used for more efficient spectral image acquisition in the future. These simulations revealed that the spectral quality deteriorated more definitively at the spatial resolution where moss spectra started to mix with spectra of surrounding rocks. Subsequently, random forest models (RFMs) were trained with lab measurements for predicting chlorophyll content and effective leaf density. The RFMs were applied to the UAS imagery of the reduced spectral and spatial resolutions to quantify decline in accuracy of both indicators. We identified the optimal UAS sensor capable of mapping a relatively large moss bed (∼5 ha) with the prediction accuracy similar to the hyperspectral system. This sensor would be a frame camera acquiring 25 VNIR spectral bands at a spatial resolution of 8 cm. This developed methodology has the potential to be adopted for other similar vegetation biophysical/chemical plant traits. |
format |
Article in Journal/Newspaper |
author |
Turner, Darren Malenovky, Zbynek Lucieer, Arko Turnbull, Johanna Robinson, Sharon A |
author_facet |
Turner, Darren Malenovky, Zbynek Lucieer, Arko Turnbull, Johanna Robinson, Sharon A |
author_sort |
Turner, Darren |
title |
Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation |
title_short |
Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation |
title_full |
Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation |
title_fullStr |
Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation |
title_full_unstemmed |
Optimizing Spectral and Spatial Resolutions of Unmanned Aerial System Imaging Sensors for Monitoring Antarctic Vegetation |
title_sort |
optimizing spectral and spatial resolutions of unmanned aerial system imaging sensors for monitoring antarctic vegetation |
publisher |
Research Online |
publishDate |
2019 |
url |
https://ro.uow.edu.au/smhpapers1/926 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1940&context=smhpapers1 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Faculty of Science, Medicine and Health - Papers: Part B |
op_relation |
https://ro.uow.edu.au/smhpapers1/926 https://ro.uow.edu.au/cgi/viewcontent.cgi?article=1940&context=smhpapers1 |
_version_ |
1766252664598822912 |