Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping
A pilot study for mapping the Arctic wetlands was conducted in the Yukon Flats National Wildlife Refuge (Refuge), Alaska. It included commissioning the HySpex VNIR-1800 and the HySpex SWIR-384 imaging spectrometers in a single-engine Found Bush Hawk aircraft, planning the flight times, direction, an...
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ftdoajarticles:oai:doaj.org/article:b397f81271d84c17bea413da6eaf758d 2023-05-15T14:55:46+02:00 Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping Jordi Cristóbal Patrick Graham Anupma Prakash Marcel Buchhorn Rudi Gens Nikki Guldager Mark Bertram 2021-03-01T00:00:00Z https://doi.org/10.3390/rs13061178 https://doaj.org/article/b397f81271d84c17bea413da6eaf758d EN eng MDPI AG https://www.mdpi.com/2072-4292/13/6/1178 https://doaj.org/toc/2072-4292 doi:10.3390/rs13061178 2072-4292 https://doaj.org/article/b397f81271d84c17bea413da6eaf758d Remote Sensing, Vol 13, Iss 1178, p 1178 (2021) HySpex hyperspectral image processing classification wetlands mapping Arctic Science Q article 2021 ftdoajarticles https://doi.org/10.3390/rs13061178 2022-12-31T03:19:35Z A pilot study for mapping the Arctic wetlands was conducted in the Yukon Flats National Wildlife Refuge (Refuge), Alaska. It included commissioning the HySpex VNIR-1800 and the HySpex SWIR-384 imaging spectrometers in a single-engine Found Bush Hawk aircraft, planning the flight times, direction, and speed to minimize the strong bidirectional reflectance distribution function (BRDF) effects present at high latitudes and establishing improved data processing workflows for the high-latitude environments. Hyperspectral images were acquired on two clear-sky days in early September, 2018, over three pilot study areas that together represented a wide variety of vegetation and wetland environments. Steps to further minimize BRDF effects and achieve a higher geometric accuracy were added to adapt and improve the Hyspex data processing workflow, developed by the German Aerospace Center (DLR), for high-latitude environments. One-meter spatial resolution hyperspectral images, that included a subset of only 120 selected spectral bands, were used for wetland mapping. A six-category legend was established based on previous U.S. Geological Survey (USGS) and U.S. Fish and Wildlife Service (USFWS) information and maps, and three different classification methods—hybrid classification, spectral angle mapper, and maximum likelihood—were used at two selected sites. The best classification performance occurred when using the maximum likelihood classifier with an averaged Kappa index of 0.95; followed by the spectral angle mapper (SAM) classifier with a Kappa index of 0.62; and, lastly, by the hybrid classifier showing lower performance with a Kappa index of 0.51. Recommendations for improvements of future work include the concurrent acquisition of LiDAR or RGB photo-derived digital surface models as well as detailed spectra collection for Alaska wetland cover to improve classification efforts. Article in Journal/Newspaper Arctic Alaska Yukon Directory of Open Access Journals: DOAJ Articles Arctic Yukon Remote Sensing 13 6 1178 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
HySpex hyperspectral image processing classification wetlands mapping Arctic Science Q |
spellingShingle |
HySpex hyperspectral image processing classification wetlands mapping Arctic Science Q Jordi Cristóbal Patrick Graham Anupma Prakash Marcel Buchhorn Rudi Gens Nikki Guldager Mark Bertram Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping |
topic_facet |
HySpex hyperspectral image processing classification wetlands mapping Arctic Science Q |
description |
A pilot study for mapping the Arctic wetlands was conducted in the Yukon Flats National Wildlife Refuge (Refuge), Alaska. It included commissioning the HySpex VNIR-1800 and the HySpex SWIR-384 imaging spectrometers in a single-engine Found Bush Hawk aircraft, planning the flight times, direction, and speed to minimize the strong bidirectional reflectance distribution function (BRDF) effects present at high latitudes and establishing improved data processing workflows for the high-latitude environments. Hyperspectral images were acquired on two clear-sky days in early September, 2018, over three pilot study areas that together represented a wide variety of vegetation and wetland environments. Steps to further minimize BRDF effects and achieve a higher geometric accuracy were added to adapt and improve the Hyspex data processing workflow, developed by the German Aerospace Center (DLR), for high-latitude environments. One-meter spatial resolution hyperspectral images, that included a subset of only 120 selected spectral bands, were used for wetland mapping. A six-category legend was established based on previous U.S. Geological Survey (USGS) and U.S. Fish and Wildlife Service (USFWS) information and maps, and three different classification methods—hybrid classification, spectral angle mapper, and maximum likelihood—were used at two selected sites. The best classification performance occurred when using the maximum likelihood classifier with an averaged Kappa index of 0.95; followed by the spectral angle mapper (SAM) classifier with a Kappa index of 0.62; and, lastly, by the hybrid classifier showing lower performance with a Kappa index of 0.51. Recommendations for improvements of future work include the concurrent acquisition of LiDAR or RGB photo-derived digital surface models as well as detailed spectra collection for Alaska wetland cover to improve classification efforts. |
format |
Article in Journal/Newspaper |
author |
Jordi Cristóbal Patrick Graham Anupma Prakash Marcel Buchhorn Rudi Gens Nikki Guldager Mark Bertram |
author_facet |
Jordi Cristóbal Patrick Graham Anupma Prakash Marcel Buchhorn Rudi Gens Nikki Guldager Mark Bertram |
author_sort |
Jordi Cristóbal |
title |
Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping |
title_short |
Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping |
title_full |
Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping |
title_fullStr |
Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping |
title_full_unstemmed |
Airborne Hyperspectral Data Acquisition and Processing in the Arctic: A Pilot Study Using the Hyspex Imaging Spectrometer for Wetland Mapping |
title_sort |
airborne hyperspectral data acquisition and processing in the arctic: a pilot study using the hyspex imaging spectrometer for wetland mapping |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/rs13061178 https://doaj.org/article/b397f81271d84c17bea413da6eaf758d |
geographic |
Arctic Yukon |
geographic_facet |
Arctic Yukon |
genre |
Arctic Alaska Yukon |
genre_facet |
Arctic Alaska Yukon |
op_source |
Remote Sensing, Vol 13, Iss 1178, p 1178 (2021) |
op_relation |
https://www.mdpi.com/2072-4292/13/6/1178 https://doaj.org/toc/2072-4292 doi:10.3390/rs13061178 2072-4292 https://doaj.org/article/b397f81271d84c17bea413da6eaf758d |
op_doi |
https://doi.org/10.3390/rs13061178 |
container_title |
Remote Sensing |
container_volume |
13 |
container_issue |
6 |
container_start_page |
1178 |
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1766327785099362304 |