Глубина, плотность и температура снега
Snow density at different depths
Note that in those places where the snow depth was small when viewing the map of snow density at greater depths (which there was not) snow density indicated zero.
Map looks bad - because it has spots on in those places where the measurement was conducted. This is a great lack of maps, extra, do not carry information icons distracting.
Suggest in the comments how to form the map to be more accurate and easier.