Operation Dates

The dates that each camera was active and functioning properly, extracted from the image EXIF data as the first and last dates of valid photographs on a given SD card. Valid photographs are defined as those taken while the camera was secured on the tree pointing outwards (in contrast to photos taken after a camera was torn down and facing the ground).

本数据集的信息提取自图像可交换图像文件格式（Exchangeable Image File Format，简称EXIF）数据，内容为每台正常运行且处于激活状态的相机所对应指定安全数字（Secure Digital，SD）卡上有效照片的最早与最晚拍摄日期。有效照片指相机固定于树干且向外朝向拍摄的照片，与相机被取下后朝向地面拍摄的照片相区分。