A probabilistic algorithm to process geolocation data
Abstract Background The use of light level loggers (geolocators) to understand movements and distributions in terrestrial and marine vertebrates, particularly during the non-breeding period, has increased dramatically in recent years. However, inferring positions from light data is not straightforwa...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Figshare
2016
|
Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3605246 https://figshare.com/collections/A_probabilistic_algorithm_to_process_geolocation_data/3605246 |
id |
ftdatacite:10.6084/m9.figshare.c.3605246 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.6084/m9.figshare.c.3605246 2023-05-15T15:44:44+02:00 A probabilistic algorithm to process geolocation data Merkel, Benjamin Phillips, Richard Descamps, Sébastien Yoccoz, Nigel Moe, Børge Strøm, Hallvard 2016 https://dx.doi.org/10.6084/m9.figshare.c.3605246 https://figshare.com/collections/A_probabilistic_algorithm_to_process_geolocation_data/3605246 unknown Figshare https://dx.doi.org/10.1186/s40462-016-0091-8 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences Collection article 2016 ftdatacite https://doi.org/10.6084/m9.figshare.c.3605246 https://doi.org/10.1186/s40462-016-0091-8 2021-11-05T12:55:41Z Abstract Background The use of light level loggers (geolocators) to understand movements and distributions in terrestrial and marine vertebrates, particularly during the non-breeding period, has increased dramatically in recent years. However, inferring positions from light data is not straightforward, often relies on assumptions that are difficult to test, or includes an element of subjectivity. Results We present an intuitive framework to compute locations from twilight events collected by geolocators from different manufacturers. The procedure uses an iterative forward step selection, weighting each possible position using a set of parameters that can be specifically selected for each analysis. The approach was tested on data from two wide-ranging seabird species - black-browed albatross Thalassarche melanophris and wandering albatross Diomedea exulans – tracked at Bird Island, South Georgia, during the two most contrasting periods of the year in terms of light regimes (solstice and equinox). Using additional information on travel speed, sea surface temperature and land avoidance, our approach was considerably more accurate than the traditional threshold method (errors reduced to medians of 185 km and 145 km for solstice and equinox periods, respectively). Conclusions The algorithm computes stable results with uncertainty estimates, including around the equinoxes, and does not require calibration of solar angles. Accuracy can be increased by assimilating information on travel speed and behaviour, as well as environmental data. This framework is available through the open source R package probGLS, and can be applied in a wide range of biologging studies. Article in Journal/Newspaper Bird Island Diomedea exulans Wandering Albatross DataCite Metadata Store (German National Library of Science and Technology) Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences |
spellingShingle |
Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences Merkel, Benjamin Phillips, Richard Descamps, Sébastien Yoccoz, Nigel Moe, Børge Strøm, Hallvard A probabilistic algorithm to process geolocation data |
topic_facet |
Evolutionary Biology FOS Biological sciences 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified 80699 Information Systems not elsewhere classified FOS Computer and information sciences Inorganic Chemistry FOS Chemical sciences |
description |
Abstract Background The use of light level loggers (geolocators) to understand movements and distributions in terrestrial and marine vertebrates, particularly during the non-breeding period, has increased dramatically in recent years. However, inferring positions from light data is not straightforward, often relies on assumptions that are difficult to test, or includes an element of subjectivity. Results We present an intuitive framework to compute locations from twilight events collected by geolocators from different manufacturers. The procedure uses an iterative forward step selection, weighting each possible position using a set of parameters that can be specifically selected for each analysis. The approach was tested on data from two wide-ranging seabird species - black-browed albatross Thalassarche melanophris and wandering albatross Diomedea exulans – tracked at Bird Island, South Georgia, during the two most contrasting periods of the year in terms of light regimes (solstice and equinox). Using additional information on travel speed, sea surface temperature and land avoidance, our approach was considerably more accurate than the traditional threshold method (errors reduced to medians of 185 km and 145 km for solstice and equinox periods, respectively). Conclusions The algorithm computes stable results with uncertainty estimates, including around the equinoxes, and does not require calibration of solar angles. Accuracy can be increased by assimilating information on travel speed and behaviour, as well as environmental data. This framework is available through the open source R package probGLS, and can be applied in a wide range of biologging studies. |
format |
Article in Journal/Newspaper |
author |
Merkel, Benjamin Phillips, Richard Descamps, Sébastien Yoccoz, Nigel Moe, Børge Strøm, Hallvard |
author_facet |
Merkel, Benjamin Phillips, Richard Descamps, Sébastien Yoccoz, Nigel Moe, Børge Strøm, Hallvard |
author_sort |
Merkel, Benjamin |
title |
A probabilistic algorithm to process geolocation data |
title_short |
A probabilistic algorithm to process geolocation data |
title_full |
A probabilistic algorithm to process geolocation data |
title_fullStr |
A probabilistic algorithm to process geolocation data |
title_full_unstemmed |
A probabilistic algorithm to process geolocation data |
title_sort |
probabilistic algorithm to process geolocation data |
publisher |
Figshare |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3605246 https://figshare.com/collections/A_probabilistic_algorithm_to_process_geolocation_data/3605246 |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Bird Island |
geographic_facet |
Bird Island |
genre |
Bird Island Diomedea exulans Wandering Albatross |
genre_facet |
Bird Island Diomedea exulans Wandering Albatross |
op_relation |
https://dx.doi.org/10.1186/s40462-016-0091-8 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3605246 https://doi.org/10.1186/s40462-016-0091-8 |
_version_ |
1766379104013123584 |