Nadir photographs taken during low-altitude transects of the Arctic Network of national park units and Selawik National Wildlife Refuge, Alaska, July 2013

Nadir images taken by automatic time-lapse from a Drift HD-170 (focal length 5.00 mm) and a GoPro Hero3 Black Edition (focal length 2.77 mm) of the arctic landscape during low altitude transects at five second intervals. Transects were conducted from small aircraft over the National Park Service’s Arctic Network (Bering Land Bridge National Preserve, Cape Krusenstern National Monument, Gates of the Arctic National Park and Preserve, Kobuk Valley National Park, and Noatak National Preserve) and the U.S. Fish and Wildlife Service’s Selawik National Wildlife Refuge in northwest Alaska.本数据集涵盖两款运动相机以5秒间隔自动定时延时拍摄的北极地貌天底视角影像：分别为Drift HD-170（焦距5.00 mm）与GoPro Hero3 Black Edition（焦距2.77 mm），拍摄全程处于低空航线飞行过程中。本次航线飞行由小型航空器执行，覆盖美国国家公园管理局（National Park Service）所辖北极网络下辖的多处保护区：白令陆桥国家保留地、克森斯角国家纪念地、北极之门国家公园及保留地、科伯克谷国家公园与诺阿塔克国家保留地，以及美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service）所辖的阿拉斯加西北部瑟拉威克国家野生动物保护区（Selawik National Wildlife Refuge）。