Aerial photographs of Atlantic walruses subspecies Odobenus rosmarus rosmarus on Matveev Island

The dataset represents aerial photographs taken from a UAV on Matveev Island, Russian Federation. There are a total of 197 images with a minimum resolution of 1632x1088 and a maximum of 5472x3648 (WxH). The main directory "walruses" contains three directories ("images", "markup", "masks"). The data is marked for instance segmentation in the form of json files. The minimum number of objects per image is 22, and the maximum is 948.