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）是探测偏远区域季节性与年际变化的强有力工具。2008年，一台延时摄影相机被安装于尼沃特岭（Niwot Ridge）D1站点下方，拍摄视野可俯瞰绿湖4号（Green Lake 4）。所采集的影像能够展现绿湖谷（Green Lakes Valley）内冰雪覆盖的季节性演化过程。