5km mesh distribution data of birds during the breeding season in Tokyo, 2016 to 2021

Surveys of breeding birds of Tokyo were conducted twice (1973-1978 and 1993-1997) and presented as "The Breeding Bird Atlas of Tokyo." From 2016 to 2021, we completed the third survey of this program. We set survey courses within each cell of a 1km square mesh (total 2344 courses) placed as a graticule over the map of Tokyo. During this survey period, we conducted two field surveys in the early morning of the breeding season. In addition to field surveys, literature information and bird observation records were collected and compiled to determine the status of birds in each 1km mesh cell. Aiming at serving researchers and conservationists who seek to evaluate the distribution of birds in Japan during this period, we will release this dataset by aggregating the information into 5km mesh as a means of protecting rare species.