EBBA2 shows different types of maps
There are three types of maps showing the distribution during the EBBA2 period: 50-km abundance maps, 50-km breeding evidence maps, and 10-km modelled maps.
Abundance map. Shows the abundance estimate for each 50-km square (dots). Grey dots denote squares where the species bred but no abundance information was provided.
Breeding evidence map. Shows the highest breeding category reported for each 50-km square (dots). Grey dots denote squares where the species bred but no atlas code was provided.
Modelled map. Shows the modelled probability of occurrence for each 10-km square within the distribution range of the species.
Change map. The change map compares the occurrence of species in EBBA1 and EBBA2 summarised as gains (blue), losses (orange) and no change (grey). In some squares, gains and losses may not reflect a real change in distribution but are due to differences in survey effort between EBBA1 and EBBA2. These squares are shown in lighter colours. The change map only includes areas well covered in both atlases.