2.2.3 Stable snow
Stable snowpack is characterized by either having more than 60 days of snow per year or experiencing a continuous period of snow lasting more than 30 consecutive days (Liu et al. 2011). Since all the remote sensing images selected for this study have time periods of less than 30 days, the study defines stable snowpack as the areas where snow is consistently present throughout the selected time periods. The extraction of stable snow areas from the remote sensing images was performed using the GIS intersection method.