Estimating the spatial position of marine mammals based on digital camera recordings
Estimating the spatial position of organisms is essential to quantify interactions between the organism and the characteristics of its surroundings, for example,predator–prey interactions, habitat selection, and social associations. Because marine mammals spend most of their time under water and may...
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Language: | English |
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2015
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Online Access: | https://www.vliz.be/imisdocs/publications/77/269577.pdf |
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ftnioz:oai:imis.nioz.nl:245508 2023-05-15T17:59:14+02:00 Estimating the spatial position of marine mammals based on digital camera recordings Hoekendijk, J.P.A. de Vries, J.J. van der Bolt, K. Greinert, J. Brasseur, S. Camphuysen, K.C.J. Aarts, G. 2015 application/pdf https://www.vliz.be/imisdocs/publications/77/269577.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000349386000005 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/ece3.1353 https://www.vliz.be/imisdocs/publications/77/269577.pdf info:eu-repo/semantics/openAccess %3Ci%3EEcol.+Evol.+5%283%29%3C%2Fi%3E%3A+578%E2%80%93589.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2Fece3.1353%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2Fece3.1353%3C%2Fa%3E [mammals] Phocoena phocoena info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftnioz https://doi.org/10.1002/ece3.1353 2022-05-01T14:01:17Z Estimating the spatial position of organisms is essential to quantify interactions between the organism and the characteristics of its surroundings, for example,predator–prey interactions, habitat selection, and social associations. Because marine mammals spend most of their time under water and may appear at the surface only briefly, determining their exact geographic location can be challenging.Here, we developed a photogrammetric method to accurately estimatethe spatial position of marine mammals or birds at the sea surface. Digital recordings containing landscape features with known geographic coordinates can be used to estimate the distance and bearing of each sighting relative to the observation point. The method can correct for frame rotation, estimates pixel size based on the reference points, and can be applied to scenarios with and without a visible horizon. A set of R functions was written to process the images and obtain accurate geographic coordinates for each sighting. The method is applied to estimate the spatiotemporal fine-scale distribution of harbourporpoises in a tidal inlet. Video recordings of harbour porpoises were made from land, using a standard digital single-lens reflex (DSLR) camera, positioned at a height of 9.59 m above mean sea level. Porpoises were detected up to a distance of ~3136 m (mean 596 m), with a mean location error of 12 m. The method presented here allows for multiple detections of different individuals within a single video frame and for tracking movements of individuals based on repeated sightings. In comparison with traditional methods, this method only requires a digital camera to provide accurate location estimates. It especially has great potential in regions with ample data on local (a)biotic conditions, to help resolve functional mechanisms underlying habitat selection and other behaviors in marine mammals in coastal areas. Article in Journal/Newspaper Phocoena phocoena NIOZ Repository (Royal Netherlands Institute for Sea Research) Ecology and Evolution 5 3 578 589 |
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Open Polar |
collection |
NIOZ Repository (Royal Netherlands Institute for Sea Research) |
op_collection_id |
ftnioz |
language |
English |
topic |
[mammals] Phocoena phocoena |
spellingShingle |
[mammals] Phocoena phocoena Hoekendijk, J.P.A. de Vries, J.J. van der Bolt, K. Greinert, J. Brasseur, S. Camphuysen, K.C.J. Aarts, G. Estimating the spatial position of marine mammals based on digital camera recordings |
topic_facet |
[mammals] Phocoena phocoena |
description |
Estimating the spatial position of organisms is essential to quantify interactions between the organism and the characteristics of its surroundings, for example,predator–prey interactions, habitat selection, and social associations. Because marine mammals spend most of their time under water and may appear at the surface only briefly, determining their exact geographic location can be challenging.Here, we developed a photogrammetric method to accurately estimatethe spatial position of marine mammals or birds at the sea surface. Digital recordings containing landscape features with known geographic coordinates can be used to estimate the distance and bearing of each sighting relative to the observation point. The method can correct for frame rotation, estimates pixel size based on the reference points, and can be applied to scenarios with and without a visible horizon. A set of R functions was written to process the images and obtain accurate geographic coordinates for each sighting. The method is applied to estimate the spatiotemporal fine-scale distribution of harbourporpoises in a tidal inlet. Video recordings of harbour porpoises were made from land, using a standard digital single-lens reflex (DSLR) camera, positioned at a height of 9.59 m above mean sea level. Porpoises were detected up to a distance of ~3136 m (mean 596 m), with a mean location error of 12 m. The method presented here allows for multiple detections of different individuals within a single video frame and for tracking movements of individuals based on repeated sightings. In comparison with traditional methods, this method only requires a digital camera to provide accurate location estimates. It especially has great potential in regions with ample data on local (a)biotic conditions, to help resolve functional mechanisms underlying habitat selection and other behaviors in marine mammals in coastal areas. |
format |
Article in Journal/Newspaper |
author |
Hoekendijk, J.P.A. de Vries, J.J. van der Bolt, K. Greinert, J. Brasseur, S. Camphuysen, K.C.J. Aarts, G. |
author_facet |
Hoekendijk, J.P.A. de Vries, J.J. van der Bolt, K. Greinert, J. Brasseur, S. Camphuysen, K.C.J. Aarts, G. |
author_sort |
Hoekendijk, J.P.A. |
title |
Estimating the spatial position of marine mammals based on digital camera recordings |
title_short |
Estimating the spatial position of marine mammals based on digital camera recordings |
title_full |
Estimating the spatial position of marine mammals based on digital camera recordings |
title_fullStr |
Estimating the spatial position of marine mammals based on digital camera recordings |
title_full_unstemmed |
Estimating the spatial position of marine mammals based on digital camera recordings |
title_sort |
estimating the spatial position of marine mammals based on digital camera recordings |
publishDate |
2015 |
url |
https://www.vliz.be/imisdocs/publications/77/269577.pdf |
genre |
Phocoena phocoena |
genre_facet |
Phocoena phocoena |
op_source |
%3Ci%3EEcol.+Evol.+5%283%29%3C%2Fi%3E%3A+578%E2%80%93589.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2Fece3.1353%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2Fece3.1353%3C%2Fa%3E |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/000349386000005 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/ece3.1353 https://www.vliz.be/imisdocs/publications/77/269577.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/ece3.1353 |
container_title |
Ecology and Evolution |
container_volume |
5 |
container_issue |
3 |
container_start_page |
578 |
op_container_end_page |
589 |
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1766168005890277376 |