2e8cb71c-0189-4d77-92b9-859cbca3f63e English series series 2026-07-20T08:28:05 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 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 North Sea SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision troposphere 2009-03-05T00:00:00 2009-04-20T00:00:00 2.17 3.4 52.1 53.4 TCE-273 Marine Data Exchange 2009, Centre for Research into Ecological and Environmental Modelling, COWRIE Research, Comparison of Ornithological Surveys Comparison of Ornithological Surveys 2007-01-01T00:00:00 creation 2021-05-17T13:33:59 publication English The report in this series describes the analysis of two aerial surveys in the Norfolk Round 3 Zone 5 potential offshore wind farm area in the spring of 2009. One survey employed on-board observers and subdivided the study region into 8 blocks or strata. These strata were surveyed over 5 days of surveying during the period 5 March-20 April. A second survey employed digital video technology to collect animal detections. This survey was completed over 3 days. 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 Richard Walls and Chris Pendlebury Centre for Research into Ecological and Environmental Modelling +44 (0)1334 461 842 rhona@mcs.st-and.ac.uk originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor COWRIE Ltd cowrie@offshorewind.co.uk owner notPlanned Documents https://www.marinedataexchange.co.uk/details/TCE-273/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 It was not feasible to estimate numbers of each species group in the entire region, because the surveys were conducted over a protracted survey period, during which bird numbers and distributions can be expected to vary substantially. We therefore used smaller areas corresponding to the strata (blocks) defined in the design of the visual surveys as the basic unit of comparison. As a result, the digital survey effort was broken into smaller blocks than in the original design of this survey. Likewise, the comparison of estimates produced by the two survey methods could only be on a single stratum where surveys by the two teams were conducted at roughly the same time. The correspondence of abundance estimates for three species groups in this stratum was reasonable for gulls, but confidence intervals for the two surveys do not overlap for the ‘seabird’ group. ABP Marine Environmental Research Ltd 02380711840 enquiries@abpmer.co.uk pointOfContact EPSG Geodetic Parameter Registry 2022-11-29 revision WGS 84