[mkgmap-dev] coastline

Fri Jan 25 19:38:09 GMT 2013

>> Can precompiled sea be created fully automatically, or is it necessary to
>> tweak broken coastlines manually?
>
> If there are no errors in the coastlines, it can be done fully
> automatically. If there are errors, you have to fix them first
> in the OSM database and retry the process.
>
>> I have access to a system running Red Hat Linux 64 bit. But I have no root
>> access and there is not much installed on the system, only java. And I have
>> not much experience using Linux. But it may be worth a try. If the process
>> can be made fully automatic, I could provide precompiled sea on a regular
>> schedule.
>
> You need to install quite sime C, C++ and java libraries and binaries.
> So without root access, it will be difficult, because you have to
> recompile everything and install it in your home directory.
>
> The process is in short:
>
> - get current planet file or update your local copy
> - osmcoastline -i -f -p land -o coastline.db  planetfile.osm.pbf
>    (if return value is 0 or 1, continue, else abort and fix the errors first)
> - ogr2ogr -f "ESRI Shapefile" land_polygons.shp coastline.db land_polygons
> - mkgmap_sea_generator land_polygons.shp WGS84 sea-$NEXT
>    (mkgmap_sea_generator is a script calling the mkgmap java function)
>
> sea-$NEXT contains now the new precomp sea data.
>
> This tooks about 1-1.5 hours, depending on your machine.

AFAIK the data on http://openstreetmapdata.com/data/land-polygons is 
updated daily - but only if there are no severe problems. The data is 
created with osmcoastline too.

So I guess it is enough to have a check skript if the data is updated.

WanMil