Here are some key characteristics of a snowfall accumulation map:

* Color gradients: Typically, different shades of blue or white are used to represent different levels of snowfall accumulation. The darkest shade represents the highest snowfall.

* Contour lines: These lines can also be used to show areas with equal amounts of snowfall.

* Data source: These maps often use data from weather stations, radar, and satellite imagery to determine snowfall amounts.

Other map types that could be used to show snowfall information:

* Snow depth map: This shows the depth of the snow cover, which can be helpful for understanding how much snow is on the ground.

* Snow cover map: This shows the areas where snow is present.

* Snowfall intensity map: This shows the rate at which snow is falling, which is useful for understanding the intensity of snowfall events.

Ultimately, the best type of map for showing the greatest snowfall depends on the specific purpose of the map.