[mkgmap-dev] Overview map for Africa

Wed Mar 27 12:18:56 GMT 2013

Thanks Gerd!
I already made a "quick and dirty"test with Nick's suggestion to use an mp image file.
See https://dl.dropbox.com/u/64716698/OSM/mkgmap/overview1.jpg and
https://dl.dropbox.com/u/64716698/OSM/mkgmap/overview2.jpg

To make this overview map, I filtered the Germany extract from everything except admin_level=2 and place=city & population>300.000
I ran mkgmap with precomp-sea and just only one level (13). With gpsmapedit I merged the resulting img with an already made overview map of a Germany test map (just a few tiles in the corners). Saved the merged map as mp file and converted back to img with mkgmap.
I used this map for the overview img. The result is that if you zoom all the way out, you see overview1.jpg, not a blank map anymore but a normal one with borders, view cities and sea. If you zoom in, the normal map appears (except where there are no tiles, then you see the overview map underneath).

I'll try your patched version later and let you know the results. Should be another big improvement of mkgmap!

Gerd wrote:
> I think I managed to migrate the changes in the overview branch into
> the
> current
> trunk version.
> Attached is the patch, the compiled binary is available here:
> http://files.mkgmap.org.uk/download/95/mkgmap.jar
> 
> overview_v1.patch
> <http://gis.19327.n5.nabble.com/file/n5754899/overview_v1.patch>
> 
> I have added two options:
> --x-overview-add-lines
> --x-overview-add-polygons
> If you add both, you get the result as with the branch version. If
> prefer
> adding only the polygons
> to see the shape of the continent.
> 
> By the way, the full img file for Africa has ~ 1.3 Mb.
> 
> So, feel free to play with it and suggest changes.
> 
> Gerd