My application draws paths between boats placed on the sea. I just
want to not draw the paths when they cross a part of land where there
is an elevation along the path higher than a constant value (that is
why I am looking for catch the highest point on the path, if the
elevation of the highest point is bigger than the constant value the
path have not to be drawn). So if there is a method to exclude the
drawing of a path when any point is above the constant value it can
solve my problem.
In fact, I'm looking for a method to find where the path cross a part
of land.

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