[mkgmap-dev] Feedback on --generate-sea

Sat Jan 9 18:17:22 GMT 2010

Firstly, Mark, many thanks for working on the sea polygon issue.

I've found two problems with --generate-sea.  One is relatively minor, 
the other a bit more of a problem.

1 (minor). If you use an options file via the mgkmap -c switch, the 
comma separated list of generate-sea sub-options cannot have any spaces, 
or you get an error
generate-sea:polygons,no-sea-sectors works fine, but

generate-sea:polygons, no-sea-sectors results in the error:
Unknown sea generation option ' no-sea-sectors'
Known sea generation options are:
   multipolygon      use a multipolygon (default)
   polygons | no-mp  use polygons rather than a multipolygon
   no-sea-sectors    disable use of "sea sectors"
   land-tag=TAG=VAL  tag to use for land polygons (default natural=land)

2 (major). If an island border has the tags
natural=coastline
boundary=administrative

Then, using Mark Burton's style (or even the default style) these 
islands get flooded.

Attached is a screenshot taken from the Geofabrik Italy extract showing 
the whole of Sicily flooded. Other islands that don't have a coastline 
containing a boundary=administrative tag are fine.

The only way to stop the flooding is to remove the 
boundary=administrative rule completely.  This is strange because as the 
natural=coastline rule occurs first (in both the default and in Mark's 
style) then the coastline should be set before any administrative 
boundary rule matches.

-- 
Charlie
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