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.本数据集涵盖俄罗斯联邦马特维耶夫岛（Matveev Island）的无人机（UAV）航拍影像。数据集总计包含197张影像，分辨率范围为1632×1088至5472×3648（宽×高）。主目录"walruses"下设有三个子目录："images"、"markup"与"masks"。该数据已完成实例分割标注，标注文件格式为JSON。每张影像中的目标实例数量最少为22个，最多可达948个。