[mkgmap-dev] precompiled sea

Wed Jan 29 22:50:31 GMT 2020

Hi Gerd, up to now I have built my UK map with the sea and land in a single
pass using --generate-sea. However, some tiles are getting the sea and land
inverted, typically where a very small amount of sea is in the tile. I was
trying to see whether if I precompiled the sea, the problem would go away -
I was assuming the tiles of precompiled sea would be bigger because they
contained no other data, so the probability of inversion would be reduced. I
was therefore first trying to generate precompiled sea, then use it to build
my UK map. It may be that my assumption is incorrect and that it won't make
any difference anyway.

Regards,
Mike

-----Original Message-----
From: Gerd Petermann [mailto:gpetermann_muenchen at hotmail.com] 
Sent: 29 January 2020 19:22
To: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk>
Subject: Re: [mkgmap-dev] precompiled sea

Hi Mike,

not sure what you are trying to do. What do you expect to get with the last
command?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Mike
Baggaley <mike at tvage.co.uk>
Gesendet: Mittwoch, 29. Januar 2020 19:20
An: 'Development list for mkgmap'
Betreff: [mkgmap-dev] precompiled sea

Hi, I have not used precomp sea before and am struggling to compile the sea
tiles. Using the following process I get a map with no sea:

Used osmfilter to extract just the coastline data
Used splitter on the coastline data
Used mkgmap on the splitter data with a simple style that just processes
coastline and with --generate-sea=multipolygon. I can see some img files
created in my sea folder
Used splitter again on the original data
Used mkgmap again with --precomp-sea and --generate-sea=multipolygon

Am I doing something wrong?

Regards,
Mike

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