Here you will find information on how well we are progressing with fieldwork for the new winter and breeding season atlases.
Data for this project are being accumulated from various sources. Timed Tetrad Visits (TTVs) and Roving Records (RRs) and coming from Bird Atlas 2007-11, the national atlas being orgainsed by the British Trust for Ornithology, BirdWatch Ireland and the Scottish Ornithologists Club, whether entered online or submitted on paper. BirdTrack records for sites that have been assigned to a tetrad are also included, as will be records submitted to the Herts Bird Club.
Atlas Status Boxes
These tables show the number of records that contribute to the species maps and tetrad tables on this website and the cutoff dates for each source of data.
These maps show the number of species found, so far, in each tetrad for the winter and breeding seasons.
The Tetrad allocation map shows which Hertfordshire tetrads have been allocated for Timed Tetrad Visits or Roving Records in both the winter and breeding seasons. To sign up for a vacant tetrad, please visit the Bird Atlas 200711 website or contact your Hertfordshire 10km Square Co-ordinator.
The coverage maps show which tetrads which have Timed Tetrad Visit data or Roving Records entered online at the Bird Atlas 2007-11 website. Records are not loaded immediately to this website, so this map is more up to date than the tetrad lists and species maps.
The species density maps show the number of species found, so far, in each tetrad for the winter and breeding seasons. Only records which have been loaded to this website are included, so these may lag behind the Bird Atlas 2007-11 website.
The Distribution maps show the final results for the 1967-72 and 1988-92 breeding atlases at the 2km (tetrad) scale and those for the 1981 winter atlas at the 10km scale. Provisional tetrad scale maps for the new winter and breeding season atlases are updated on a regular basis as more records become available, during the four years of this project.