Development of Snow Cover Frequency Maps from MODIS Snow Cover Products

With a decade scale record of global snow cover extent (SCE) at up to 500 m from the Moderate-resolution Imaging Spectroradiometer (MODIS), dynamics can be mapped local scales. We developed daily frequency maps 2001–2020 using ~5 km resolution MODIS map. For each day year show for 20-year period on per-grid cell basis. Following other work develop products, we include spatial filtering reduce errors caused by ‘false snow’ that occurs primarily due cloud-snow confusion. On our maps, there were no regions or time periods with noticeable absence where was expected. In one example, derived 25 December compares well NOAA’s historical probability same day. Though and NOAA probabilities are computed very different data sources, they compare well. this preliminary research is promising, much future evaluation needed.