Skip to content

Research at St Andrews

Remote estimation of grey seal length, width, and body mass from aerial photography

Research output: Contribution to journalArticle

Standard

Remote estimation of grey seal length, width, and body mass from aerial photography. / Twiss, S D ; Pomeroy, P P ; Thomas, C J ; Mills, J P .

In: Photogrammetric Engineering & Remote Sensing, Vol. 66, 07.2000, p. 859-866.

Research output: Contribution to journalArticle

Harvard

Twiss, SD, Pomeroy, PP, Thomas, CJ & Mills, JP 2000, 'Remote estimation of grey seal length, width, and body mass from aerial photography' Photogrammetric Engineering & Remote Sensing, vol. 66, pp. 859-866.

APA

Twiss, S. D., Pomeroy, P. P., Thomas, C. J., & Mills, J. P. (2000). Remote estimation of grey seal length, width, and body mass from aerial photography. Photogrammetric Engineering & Remote Sensing, 66, 859-866.

Vancouver

Twiss SD, Pomeroy PP, Thomas CJ, Mills JP. Remote estimation of grey seal length, width, and body mass from aerial photography. Photogrammetric Engineering & Remote Sensing. 2000 Jul;66:859-866.

Author

Twiss, S D ; Pomeroy, P P ; Thomas, C J ; Mills, J P . / Remote estimation of grey seal length, width, and body mass from aerial photography. In: Photogrammetric Engineering & Remote Sensing. 2000 ; Vol. 66. pp. 859-866.

Bibtex - Download

@article{afedbb127df54c718295e8ba3dd63b33,
title = "Remote estimation of grey seal length, width, and body mass from aerial photography",
abstract = "High-resolution images of two UK grey seal breeding colonies were derived from multi-temporal aerial photography and geo-referenced in a GIS using ground control points obtained in the field with sub-meter DGPS. Lengths and widths of seals were digitized from these images. Elevations at seal locations were determined using sub-meter DEMs, allowing measurements to be adjusted for proximity to the camera. Mass estimates of seals were computed from these measures using models developed from direct field measurements. Comparisons of estimates derived from the images and actual masses of seals measured in the field indicate that this method provides a consistent index of relative body size. Seasonal patterns of changes in remotely determined size and mass estimates and inter-colony comparisons mirrored patterns observed from direct field measurements. Our work permits the remote estimation of seal body size for any sample of seals without the intrusive complications and sample limitations of direct field measurements.",
keywords = "Halichoerus-grypus, North-Rona, Site fidelity, Scotland, Success",
author = "Twiss, {S D} and Pomeroy, {P P} and Thomas, {C J} and Mills, {J P}",
year = "2000",
month = "7",
language = "English",
volume = "66",
pages = "859--866",
journal = "Photogrammetric Engineering & Remote Sensing",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Remote estimation of grey seal length, width, and body mass from aerial photography

AU - Twiss, S D

AU - Pomeroy, P P

AU - Thomas, C J

AU - Mills, J P

PY - 2000/7

Y1 - 2000/7

N2 - High-resolution images of two UK grey seal breeding colonies were derived from multi-temporal aerial photography and geo-referenced in a GIS using ground control points obtained in the field with sub-meter DGPS. Lengths and widths of seals were digitized from these images. Elevations at seal locations were determined using sub-meter DEMs, allowing measurements to be adjusted for proximity to the camera. Mass estimates of seals were computed from these measures using models developed from direct field measurements. Comparisons of estimates derived from the images and actual masses of seals measured in the field indicate that this method provides a consistent index of relative body size. Seasonal patterns of changes in remotely determined size and mass estimates and inter-colony comparisons mirrored patterns observed from direct field measurements. Our work permits the remote estimation of seal body size for any sample of seals without the intrusive complications and sample limitations of direct field measurements.

AB - High-resolution images of two UK grey seal breeding colonies were derived from multi-temporal aerial photography and geo-referenced in a GIS using ground control points obtained in the field with sub-meter DGPS. Lengths and widths of seals were digitized from these images. Elevations at seal locations were determined using sub-meter DEMs, allowing measurements to be adjusted for proximity to the camera. Mass estimates of seals were computed from these measures using models developed from direct field measurements. Comparisons of estimates derived from the images and actual masses of seals measured in the field indicate that this method provides a consistent index of relative body size. Seasonal patterns of changes in remotely determined size and mass estimates and inter-colony comparisons mirrored patterns observed from direct field measurements. Our work permits the remote estimation of seal body size for any sample of seals without the intrusive complications and sample limitations of direct field measurements.

KW - Halichoerus-grypus

KW - North-Rona

KW - Site fidelity

KW - Scotland

KW - Success

UR - http://www.scopus.com/inward/record.url?scp=0033948615&partnerID=8YFLogxK

UR - http://www.asprs.org/PE-RS-Journals-2000/PE-RS-July-2000.html

M3 - Article

VL - 66

SP - 859

EP - 866

JO - Photogrammetric Engineering & Remote Sensing

T2 - Photogrammetric Engineering & Remote Sensing

JF - Photogrammetric Engineering & Remote Sensing

ER -

Related by author

  1. Changes in stable isotope compositions during fasting in phocid seals

    Habran, S., Damseaux, F., Pomeroy, P., Debier, C., Crocker, D., Lepoint, G. & Das, K., 30 Jan 2019, In : Rapid Communications in Mass Spectrometry. 33, 2, p. 176-184 9 p.

    Research output: Contribution to journalArticle

  2. EIRPHOT : A critical assessment of Wales’ grey seal ( Halichoerus grypus ) photo - identification database .

    Langley, I. J., Rosas Da Costa Oliver, T. V., Stringell, T., Morris, C., Hiby, L. & Pomeroy, P., 21 Jan 2019, Bangor: Natural Resources Wales. 94 p. (evidence report series; no. 280)

    Research output: Book/ReportCommissioned report

  3. Seal carrion is a predictable resource for coastal ecosystems

    Quaggiotto, M-M., Barton, P. S., Morris, C. D., Moss, S. E. W., Pomeroy, P. P., McCafferty, D. J. & Bailey, D. M., Apr 2018, In : Acta Oecologica. 88, p. 41-51 11 p.

    Research output: Contribution to journalArticle

  4. Intraseasonal temporal variation of reproductive effort for male grey seals

    Bishop, A. M., Stewart, J. E., Pomeroy, P. & Twiss, S., Dec 2017, In : Animal Behaviour. 134, p. 167-175

    Research output: Contribution to journalArticle

ID: 814104