Is there a reason why they used those specific colors? I don't understand why a hospital would be yellow or a police station would be black by default. My guess would be white and blue, respectively.
Snow. At least that'd be my first guess for not going with white.
In general, you want to use distinctive characteristics that aren't common in that environment.
Imagine trying to find a hospital under these conditions, vibrant color coding helps save lives then:
I think it's completely reasonable to assume Greenland has relatively separate history from wherever you got the "white and blue" intuition from.