Photogrammetric Bathymetry for the Canadian Arctic
This study proposes and demonstrates a through-water photogrammetry approach for Satellite Derived Bathymetry (SDB), which may be used to map nearshore bathymetry in the Canadian Arctic. A four step process is used: First, a standard photogrammetric extraction is performed on 2 m resolution WorldVie...
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Université d'Ottawa / University of Ottawa
2018
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ftunivottawa:oai:ruor.uottawa.ca:10393/37553 2023-05-15T14:53:04+02:00 Photogrammetric Bathymetry for the Canadian Arctic Hodul, Matus Knudby, Anders Jensen 2018-04-25 application/pdf http://hdl.handle.net/10393/37553 https://doi.org/10.20381/ruor-21822 en eng Université d'Ottawa / University of Ottawa http://hdl.handle.net/10393/37553 http://dx.doi.org/10.20381/ruor-21822 Photogrammetry Bathymetry Hydrography Remote Sensing Thesis 2018 ftunivottawa https://doi.org/10.20381/ruor-21822 2021-01-04T13:39:49Z This study proposes and demonstrates a through-water photogrammetry approach for Satellite Derived Bathymetry (SDB), which may be used to map nearshore bathymetry in the Canadian Arctic. A four step process is used: First, a standard photogrammetric extraction is performed on 2 m resolution WorldView stereo imagery, then apparent depths are calculated by referencing submerged points to the extracted elevation of the water level seen in the image. Due to the effects of refraction, these apparent depths are underestimates, and a refraction correction factor is applied to convert to actual depths. Finally, tidal stage at the time of image acquisition is used to bring depths to chart datum. A post processing step may be applied to remove erroneous depths caused by water surface objects such as boats, debris, or large waves. This was demonstrated in six study areas across Nunavut, Canada to test its robustness under a variety of environmental conditions, including different seafloor types, and under varying sea states. The six study sites were (with vertical accuracy given in Root Mean Square Error/and vertical bias, both in meters): eastern Coral Harbour (1.18/0.03), western Coral Harbour (0.78/-0.32), Cambridge Bay (1.16/0.08), Queen Maud Gulf (0.97/0.13), Arviat (1.02/0.13), and Frobisher Bay, where bathymetry extraction largely failed due to unfavourable sea surface conditions. These findings show that the proposed method has similar or better vertical accuracy as currently established SDB approaches; however, it has several benefits over the established methods which make it better suited for the Arctic. Namely, not requiring the precise atmospheric correction necessary for physics-based models, which is difficult at high latitudes; as well as being able to function in heterogeneous seafloor environments and not needing in-situ calibration data like the empirical spectral ratio approach, better suiting it to remote Arctic waters which often lack existing bathymetric survey data. Thesis Arctic Arviat Cambridge Bay Coral Harbour Frobisher Bay Nunavut Queen Maud Gulf uO Research (University of Ottawa - uOttawa) Arctic Cambridge Bay ENVELOPE(-105.130,-105.130,69.037,69.037) Canada Coral Harbour ENVELOPE(-83.073,-83.073,64.122,64.122) Frobisher Bay ENVELOPE(-66.581,-66.581,62.834,62.834) Nunavut Queen Maud Gulf ENVELOPE(-102.002,-102.002,68.334,68.334) |
institution |
Open Polar |
collection |
uO Research (University of Ottawa - uOttawa) |
op_collection_id |
ftunivottawa |
language |
English |
topic |
Photogrammetry Bathymetry Hydrography Remote Sensing |
spellingShingle |
Photogrammetry Bathymetry Hydrography Remote Sensing Hodul, Matus Photogrammetric Bathymetry for the Canadian Arctic |
topic_facet |
Photogrammetry Bathymetry Hydrography Remote Sensing |
description |
This study proposes and demonstrates a through-water photogrammetry approach for Satellite Derived Bathymetry (SDB), which may be used to map nearshore bathymetry in the Canadian Arctic. A four step process is used: First, a standard photogrammetric extraction is performed on 2 m resolution WorldView stereo imagery, then apparent depths are calculated by referencing submerged points to the extracted elevation of the water level seen in the image. Due to the effects of refraction, these apparent depths are underestimates, and a refraction correction factor is applied to convert to actual depths. Finally, tidal stage at the time of image acquisition is used to bring depths to chart datum. A post processing step may be applied to remove erroneous depths caused by water surface objects such as boats, debris, or large waves. This was demonstrated in six study areas across Nunavut, Canada to test its robustness under a variety of environmental conditions, including different seafloor types, and under varying sea states. The six study sites were (with vertical accuracy given in Root Mean Square Error/and vertical bias, both in meters): eastern Coral Harbour (1.18/0.03), western Coral Harbour (0.78/-0.32), Cambridge Bay (1.16/0.08), Queen Maud Gulf (0.97/0.13), Arviat (1.02/0.13), and Frobisher Bay, where bathymetry extraction largely failed due to unfavourable sea surface conditions. These findings show that the proposed method has similar or better vertical accuracy as currently established SDB approaches; however, it has several benefits over the established methods which make it better suited for the Arctic. Namely, not requiring the precise atmospheric correction necessary for physics-based models, which is difficult at high latitudes; as well as being able to function in heterogeneous seafloor environments and not needing in-situ calibration data like the empirical spectral ratio approach, better suiting it to remote Arctic waters which often lack existing bathymetric survey data. |
author2 |
Knudby, Anders Jensen |
format |
Thesis |
author |
Hodul, Matus |
author_facet |
Hodul, Matus |
author_sort |
Hodul, Matus |
title |
Photogrammetric Bathymetry for the Canadian Arctic |
title_short |
Photogrammetric Bathymetry for the Canadian Arctic |
title_full |
Photogrammetric Bathymetry for the Canadian Arctic |
title_fullStr |
Photogrammetric Bathymetry for the Canadian Arctic |
title_full_unstemmed |
Photogrammetric Bathymetry for the Canadian Arctic |
title_sort |
photogrammetric bathymetry for the canadian arctic |
publisher |
Université d'Ottawa / University of Ottawa |
publishDate |
2018 |
url |
http://hdl.handle.net/10393/37553 https://doi.org/10.20381/ruor-21822 |
long_lat |
ENVELOPE(-105.130,-105.130,69.037,69.037) ENVELOPE(-83.073,-83.073,64.122,64.122) ENVELOPE(-66.581,-66.581,62.834,62.834) ENVELOPE(-102.002,-102.002,68.334,68.334) |
geographic |
Arctic Cambridge Bay Canada Coral Harbour Frobisher Bay Nunavut Queen Maud Gulf |
geographic_facet |
Arctic Cambridge Bay Canada Coral Harbour Frobisher Bay Nunavut Queen Maud Gulf |
genre |
Arctic Arviat Cambridge Bay Coral Harbour Frobisher Bay Nunavut Queen Maud Gulf |
genre_facet |
Arctic Arviat Cambridge Bay Coral Harbour Frobisher Bay Nunavut Queen Maud Gulf |
op_relation |
http://hdl.handle.net/10393/37553 http://dx.doi.org/10.20381/ruor-21822 |
op_doi |
https://doi.org/10.20381/ruor-21822 |
_version_ |
1766324495521415168 |