Survey Details - Timed Tetrad Visits
Timed Tetrad Visits
The Timed Tetrad Visits (TTVs) method gathered records from tetrads (2 x 2-km squares) and were used to generate information on relative abundance of a species within a 10-km square.
2007
2011
The purpose of the survey was to map the distribution of all bird species, generate information on patterns of relative abundance, quantify distribution changes, inform conservation priorities, and engage a new generation of recorders.
Casual observations
The survey covered both Britain and Ireland, but only the Republic of Ireland subset of data are displayed.
Four winters and four summers from November 2007 to July 2011.
Hiqh quality. All data underwent rigourous data verification and validation.
Further information some of the key findings of the survey are presented on the BirdWatch Ireland website http://www.birdwatchireland.ie/OurWork/ResearchSurveys/Atlas/tabid/487/Default.aspx
BirdWatch Ireland, Bird Atlas 2007 - 2011, Survey: Timed Tetrad Visits, National Biodiversity Data Centre, Ireland, accessed 20 June 2018, <https://maps.biodiversityireland.ie/Dataset/220/Survey/507>
Survey Statistics
351744
0
274
Survey species distribution

Terrestrial Map - 10km

Distribution of the number of species recorded within each 10km grid square (ITM).
Live Map

Marine Map - 50Km

Distribution of the number of species recorded within each 50km grid square (WGS84).
Live Map
Survey records distribution

Terrestrial Map - 10km

Distribution of the number of records within each 10km grid square (ITM).
Live Map

Marine Map - 50Km

Distribution of the number of records within each 50km grid square (WGS84).
Live Map
Records per year
Species per year