How to differentiate between land and sea in python?

[المشرف العام]

I'm going to plot some positions of ships, and thus see which areas (out at sea) where there is no vessels, however, if I do this in an ordinary geographical area defined by a square, all the land area will be defined as an area without ships. This is ofc true, but how do I avoid it?

I have lots of lat/long coordinates of ship positions, and are primarily doing this in Python, but don't worry, a pseudocode will suffice.



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