High resolution terrestrial laser scanning (TLS) within the Simud Hitam cave, Gomantong, has proven successful at discriminating the nests of black-nest swiftlets from roosting bats in high, inaccessible locations. TLS data was imported into ArcGIS software, allowing for semi-automated counting of nests. Spatial analysis of nest locations has established a maximum packing density of 268 nests/m2 in optimum locations, which correspond to roof slopes of >20 degrees. Rhinolophid bats roost adjacent to, but not within nest locations, preferring roof surfaces close to horizontal.
McFarlane, Donald A.; Warren Roberts; Manfred Buchroithner; Guy Van Rentergem; Joyce Lundberg; and Stefan Hautz.
Terrestrial LiDAR-based automated counting of swiftlet nests in the caves of Gomantong, Sabah, Borneo..
International Journal of Speleology,
Available at: http://scholarcommons.usf.edu/ijs/vol44/iss2/6