Harbour porpoise surveys in the Blasket Islands SAC, 2018

Published by: Department of Housing, Local Government, and Heritage

Licensed under: Creative Commons Attribution 4.0

Category: Environment

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A set of visual surveys for Harbour porpoise (Phocoena phocoena) was carried out in the Blasket Islands SAC in order to derive local density and abundance estimates. Single platform line-transect surveys were carried out according to a standardised design on six days between June and September 2018. Surveys were conducted between 5th June and 24th September 2018.

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Theme	Environment
Date released	2022-07-07
Date updated	2023-11-20
Dataset conforms to these standards	The INSPIRE Directive or INSPIRE lays down a general framework for a Spatial Data Infrastructure (SDI) for the purposes of European Community environmental policies and policies or activities which may have an impact on the environment.
Rights notes	{http://creativecommons.org/licenses/by/4.0/,"Copyright Government of Ireland. This dataset was created by National Parks and Wildlife Service, Department of Housing, Local Government and Heritage. This copyright material is licensed for re-use under the Creative Commons Attribution 4.0 International licence. http://creativecommons.org/licenses/by/4.0/",otherRestrictions}
Update frequency	Other
Language	English
Geographic coverage in GeoJSON format	{"type":"Polygon","coordinates":[[[-10.650444030762, 50.807923689449],[-10.650444030762, 55.993470564449], [-5.289115905762, 55.993470564449], [-5.289115905762, 50.807923689449], [-10.650444030762, 50.807923689449]]]}
Spatial Reference Systems (SRS)	WGS 84 (EPSG:4326)
Vertical Extent	{"verticalDomainName": "EPSG Projection 5731 - Malin Head height", "minVerticalExtent": "0", "maxVerticalExtent": "1014"}
Provenance information	The shapefile HPBI18_Species_Survey_1 was created on the 5th June 2018 as part of the 2018 Harbour porpoise surveys in the Blasket Islands SAC. During each transect the position of the survey vessel was tracked continuously through a GPS receiver connected to a laptop computer, while survey effort data including environmental conditions (sea-state, wind strength and direction, glare, etc.) were recorded every 15 minutes using LOGGER software ( IFAW). When a sighting was made the position of the vessel was recorded immediately and the angle of the sighting from the track of the vessel and the estimated radial distance of the sighted animal(s) from the vessel were recorded. These data were communicated to the recorder in the wheelhouse via VHF radio. The angle was recorded to the nearest degree using an angle board attached to the vessel immediately in front of each observer. Accurate distance estimation is important for distance sampling. Measuring sticks (Heinemann 1981) were used by each primary observer to assist in distance estimation. The data was modified to comply with GDPR legislation and open data publication guidelines.
Period of time covered (begin)	2018-06-06
Period of time covered (end)	2018-09-24