OBS:
In recent dev builds, areas of low lying land (tidal, or coastal areas) in the in game map and Eden editor map are covered by a faint pattern of partial yellow squares.
They are most obvious when map textures are disabled, but the are also displayed over the textured map.
These areas are also shaded light blue, but the blue shading is far more continuous, with intensity related to land height.

EXP:
Any shading of the map should be continuous, without any obvious tiling pattern.