Skip to content

Research at St Andrews

A simple new algorithm to filter marine mammal Argos locations

Research output: Contribution to journalArticle

Author(s)

Carla Freitas, Christian Lydersen, Michael A. Fedak, Kit M. Kovacs

School/Research organisations

Abstract

During recent decades satellite telemetry using the Argos system has been used extensively to track many species of marine mammals. However, the aquatic behavior of most of these species results in a high number of locations with low or unknown accuracy. Argos data are often filtered to reduce the noise produced by these locations, typically by removing data points requiring unrealistic swimming speeds. Unfortunately, this method excludes a considerable number of good-quality locations that have high traveling speeds that are the result of two locations being taken very close in time. We present an alternative algorithm, based on swimming speed, distance between successive locations, and turning angles. This new filter was tested on 67 tracks from nine different marine mammal species: ringed, bearded, gray, harbor, southern elephant, and Antarctic fur seals, walruses, belugas, and nar-whals. The algorithm removed similar percentages of low-quality locations (Argos location classes [LC] B and A) compared to a filter based solely on swimming speed, but preserved significantly higher percentages of good-quality positions (mean SE% of locations removed was 4.1 +/- 0.8% vs. 12.6 +/- 1.2% for LC 3; 6.8 +/- 0.6% vs. 15.7 +/- 0.9% for LC 2; and 11.4 +/- 0.7% vs. 21.0 +/- 0.97o for LC 1). The new filter was also more effective at removing unlikely, conspicuous deviations from the track's path, resulting in fewer locations being registered on land and a significant reduction in home range size, when using the Minimum Convex Polygon method, which is sensitive to outliers.

Close

Details

Original languageEnglish
Pages (from-to)315-325
Number of pages11
JournalMarine Mammal Science
Volume24
Issue number2
Early online date27 Dec 2007
DOIs
StatePublished - Apr 2008

    Research areas

  • cetaceans, location class accuracy, location errors, path filter, pinnipeds, satellite telemetry, SEALS HALICHOERUS-GRYPUS, SOUTHERN ELEPHANT SEALS, SATELLITE-TRACKING, GRAY SEALS, TELEMETRY, ACCURACY, BEHAVIOR

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Aquatic behaviour of polar bears (Ursus maritimus) in an increasingly ice-free Arctic

    Lone, K., Kovacs, K. M., Lydersen, C., Fedak, M., Andersen, M., Lovell, P. & Aars, J. 1 Dec 2018 In : Scientific Reports. 8, 12 p., 9677

    Research output: Contribution to journalArticle

  2. Variation in the distribution and properties of Circumpolar Deep Water in the eastern Amundsen Sea, on seasonal timescales, using seal-borne tags

    Mallett, H. K. W., Boehme, L., Fedak, M., Heywood, K. J., Stevens, D. P. & Roquet, F. 24 May 2018 In : Geophysical Research Letters. Early View, 9 p.

    Research output: Contribution to journalArticle

  3. Hooded seal Cystophora cristata foraging areas in the Northeast Atlantic Ocean— investigated using three complementary methods

    Vacquie-Garcia, J., Lydersen, C., Biuw, M., Haug, T., Fedak, M. A. & Kovacs, K. M. 6 Dec 2017 In : PLoS One. 12, 12, 23 p., e0187889

    Research output: Contribution to journalArticle

  4. In-situ observations using tagged animals

    Roquet, F. , Boehme, L. , Bester, M. , Bornemann, H. , Brasseur, S. , Charrassin, J-B. , Costa, D. , Fedak, M. A. , Guinet, C. , Hall, A. J. , Harcourt, R. , Hindell, M. , Kovacs, K. M. , Lea, M-A. , Lovell, P. , Lowther, A. , Lydersen, C. , McMahon, C. , Picard, B. , Reverdin, G. & 1 others Vincent, C. 21 Feb 2017 5 p.

    Research output: Contribution to conferencePaper

Related by journal

  1. Marine Mammal Science (Journal)

    Smout, S. C. (Reviewer)
    1 Dec 201730 Dec 2017

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  2. Marine Mammal Science (Journal)

    Hanson, N. N. (Member of editorial board)
    2017

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  3. Marine Mammal Science (Journal)

    Smout, S. C. (Reviewer)
    Jul 2016 → …

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  4. Marine Mammal Science (Journal)

    Arso Civil, M. (Reviewer)
    20142018

    Activity: Publication peer-review and editorial workPeer review of manuscripts

  5. Marine Mammal Science (Journal)

    Hanson, N. N. (Reviewer)
    2012 → …

    Activity: Publication peer-review and editorial workPeer review of manuscripts

Related by journal

  1. Accuracy and precision of dolphin group size estimates

    Gerrodette, T., Perryman, W. L. & Oedekoven, C. S. Jan 2019 In : Marine Mammal Science. 35, 1, p. 22-39 18 p.

    Research output: Contribution to journalArticle

  2. Breathing synchrony in franciscana (Pontoporia blainvillei) and Guiana dolphins (Sotalia guianensis) in Southern Brazil

    Actis, P. S., Danilewicz, D., Cremer, M. J. & Bortolotto, G. A. Jul 2018 In : Marine Mammal Science. 34, 3, p. 777-789

    Research output: Contribution to journalArticle

  3. Clicks of dwarf sperm whales (Kogia sima)

    Merkens, K., Mann, D., Janik, V. M., Claridge, D., Hill, M. & Oleson, E. 24 Oct 2018 In : Marine Mammal Science. 34, 4, p. 963-978

    Research output: Contribution to journalArticle

  4. Distribution and abundance of beaked whales (Family Ziphiidae) off Cape Hatteras, North Carolina, U.S.A.

    McLellan, W. A., McAlarney, R. J., Cummings, E. W., Read, A. J., Paxton, C. G. M., Bell, J. T. & Pabst, D. A. 30 Mar 2018 In : Marine Mammal Science. 34, 4, p. 997-1017

    Research output: Contribution to journalArticle

  5. Harbor porpoise (Phocoena phocoena) reactions to pingers

    Kindt-Larsen, L., Willestofte Berg, C., Northridge, S. P. & Larsen, F. 2 Nov 2018 In : Marine Mammal Science. Early View

    Research output: Contribution to journalArticle

ID: 615273