82625fd3-9bb4-4387-876b-d28fc2058e11 English series series 2026-07-15T11:14:38 MEDIN 3.1.2 biota Bird counts SeaDataNet Parameter Discovery Vocabulary 2026-06-19 revision Bird behaviour SeaDataNet Parameter Discovery Vocabulary 2026-06-19 revision Bird taxonomy-related abundance per unit area of surface SeaDataNet Parameter Discovery Vocabulary 2026-06-19 revision Research The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Research and Development Activity The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Species distribution GEMET - INSPIRE themes, version 1.0 2009-07-31 revision SeaDataNet sea areas 2012-11-07 revision Irish Sea and St. George's Channel SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision troposphere 2007-08-05T23:00:00 2007-08-05T23:00:00 -3.72 -3.61 54.48 54.54 TCE-249 Marine Data Exchange 2007, HiDef, COWRIE Research, Trial High Definition Video Survey of Seabirds Trial High Definition Video Survey of Seabirds 2007-01-01T00:00:00 creation 2021-05-17T13:33:47 publication English This report describes the method, output and learning from a trial of a high-definition video survey technique for census of seabirds and windfarm sites. The technique utilises a gyroscopically stabilised camera mount to eliminate aircraft vibration enabling the use of high magnification lenses. This in turn enables the helicopter to fly at a significant distance from the birds, while still maintaining sufficient image quality to identify them and assess certain aspects of their behaviour. The video is coupled with a GPS logging system that associates a geographical location with each video frame, enabling subsequent statistical analysis of the spatial distribution of birds. Origin: HiDef Aerial Surveying Ltd There will be no limitations when published on the Marine Data Exchange otherRestrictions Data Must be used in accordance to the Marine Data Exchange's Terms of Use: https://www.marinedataexchange.co.uk/content/info/terms-of-use otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian Dr M. Mellor HiDef Aerial Surveying Ltd 44 (0) 1480 466 335 enquiries@hidefsurveying.co.uk originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor COWRIE cowrie@offshorewind.co.uk owner notPlanned Documents https://www.marinedataexchange.co.uk/details/TCE-249/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08T00:00:00 publication Conformity with the Commission Regulation (EU) No 1089/2010 was either not relevant to this dataset or not a requirement of the Marine Data Exchange for the creation and submission of this dataset; therefore, conformity has not been assessed and cannot be declared False series The general findings of the trial are as follows: The system provides sufficient detail to enable reliable identification of birds in most cases. Altitudes in excess of 1km are feasible; cloud-base would typically be the limiting factor. Although this survey was not carried out over an existing windfarm, the altitude and image quality demonstrate that it directly applicable to windfarm survey. Despite higher wind speeds than would be tolerated on a conventional survey, it was possible to conclude that all birds had been observed on most transects with a high degree of confidence. To ensure recognition of smaller species, image width must be fixed at around 30m, which is substantially smaller than the zone in which it is assumed conventional surveys have a 100% detection rate. Transects must therefore be significantly closer than is the case during conventional surveys. Some difficulties were encountered in operating the video equipment in the manner required by the trial and an approach that minimises these effects has been identified. Technical refinements to improve quality and reduce cost have been identified, which it may be appropriate to test in a second survey. HiDef Aerial Surveying Ltd Dr M. Mellor 02380711840 jeremy.nedwell@subacoustech.com pointOfContact EPSG Geodetic Parameter Registry 2022-11-29 revision WGS 84