Time lapse camera photos for Green Lakes Valley, 2011 - ongoing.

Time lapse photography is a powerful tool to detect seasonal and
interannual change in remote locations. In 2008, a time lapse camera
was installed at Niwot Ridge, below D1, with a view overlooking
Green Lake 4. The resulting photos give a view into the seasonal
evolution of ice and snow cover over the Green Lakes Valley.

延时摄影（Time lapse photography）是探测偏远地区季节与年际变化的有力工具。2008年，一台延时摄影相机被安装于D1下方的尼沃特岭（Niwot Ridge），其拍摄视角可俯瞰绿湖4号（Green Lake 4）。由此获取的影像记录了绿湖谷（Green Lakes Valley）内冰雪覆盖的季节演化过程。