Earth.
Airborne Snow Observatory: Measuring Snowpack from the Sky
Jet Propulsion Laboratory https://www.jpl.nasa.gov/ Dec. 9, 2013
The Airborne Snow Observatory is two instruments put together that look at the surface, that tells us how deep the snow is and how much sunlight that snow absorbs and those two combined are what control how fast water comes out of the mountains and how much of that water comes out of the mountains from snow.