Another great test simple case! But: are you sure that generate-sea=polygon really works? I have tested generate-sea=multipolygon,extends-sea-sectors,close-gaps=5000 and generate-sea=polygon,extends-sea-sectors,close-gaps=5000 but both created the same result displayed on the left in your image.
Please post your mkgmap options if you are sure that polygon works for you. Hi,
generate-sea=extends-sea-sectors works generate-sea=multipolygon does not
I did not even know that you could combine those.
Thanks,
N.
It's my fault. I edited the wrong config file..... Your results are quite expectable and are correct! multipolygon is set as default for generate-sea. So generate-sea=extend-sea-sectors is interpreted as generate-sea=multipolygon,extend-sea-sectors. Why does generate-sea=multipolygon without extend-sea-sectors not work? The land mass in the south east of the tile does not hit the east tile border. extend-sea-sectors fills the gap between the tile border and the unclosed polygon. If extend-sea-sectors is not defined the polygon is closed in a very poor way which you see on the right in your image. WanMil