The NPS contracted with ABR, Inc., to develop a map that depicts the day of the year that a Landsat 30-meter pixel becomes snow free during the spring from 1999 to 2015. Annual coverage is available from 2010 to 2015. The project also includes mapping lichen distribution across a large swath of east-central Alaska and the Yukon. These maps allow managers to monitor trends in landscapes, which informs issues such as access, habitat condition and timing of management or treatment activities.
Map showing snow melt timing in Alaska