[mkgmap-dev] mkgmap-dev Digest, Vol 153, Issue 40 Resolution 23 raster problems

Tue May 4 13:46:47 BST 2021

I find that while using many levels the overall map size increases, each
zoom level is a bit better. So I use all resolution from 24-18 for the map,
and 11-17 for the overview map.
levels = 0:24, 1:22, 2:21, 3:20, 4:19, 5:18
overview-levels = 6:17, 7:16, 8:15, 9:14, 10:12, 11:11
For contourlines of course no overview map, and starting later.

As for highways - they usually are inside a highway relation, but without
specifying which is which direction or anything. In general each direction
has a oneway=yes/1/-1/reverse tag. but yes that relation will not help at
all I feel. There is no way inside osm data to directly tell that it goes
two ways and be able to say from resolution 18 or 19 onwards only to say
show direction=forward vs direction=forward and direction=backward lines.

On Tue, 4 May 2021 at 20:33, Gerd Petermann <gpetermann_muenchen at hotmail.com>
wrote:

> Hi Felix,
>
> it probably depends on the --levels option, means, how many levels you put
> into a gmapsupp.
>
> And yes, I don't have a clear idea how to detect parallel lines which will
> / should collapse into one line.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Dienstag, 4. Mai 2021 13:19
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] mkgmap-dev Digest, Vol 153, Issue 40 Resolution
> 23 raster problems
>
> Wow - looks really good. The main problem I feel is now that sometimes
> highways you can see both directions apart - while before this was less
> rare - or lost in the jaggedness.
>
> --x-simplify-filter-line-errors=23:3.6,22:4.2,21:5.4,20:6,19:7,18:7.5,16:8,15:9
> --x-simplify-filter-polygon-errors=23:4.6,22:7,21:8,20:9,15:10
> --polygon-size-limits=24:16,23:14,22:12,21:11,20:10,19:9,18:8,17:7,16:6,15:5,14:4,13:3,12:2,11:0,10:0
> seems to give pretty nice results - and much faster on my Garmin 600 at
> lower resolutions.
>
> I guess those highways with dual directions are much harder to solve...
>
> On Tue, 4 May 2021 at 17:24, Gerd Petermann <
> gpetermann_muenchen at hotmail.com<mailto:gpetermann_muenchen at hotmail.com>>
> wrote:
> Hi Felix,
>
> OK, I am happy to hear feedback regarding the latest changes the branch.
> Next planned step is to check if the simplify4.patch still improves things
> and maybe improve it further.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:
> mkgmap-dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Felix Hartmann <
> extremecarver at gmail.com<mailto:extremecarver at gmail.com>>
> Gesendet: Dienstag, 4. Mai 2021 11:03
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] mkgmap-dev Digest, Vol 153, Issue 40 Resolution
> 23 raster problems
>
> well I never got the merge-more patch actually running as together with
> simplify v4 it did not change anything for me. I'm waiting for updates on
> the new branch to test things.
> I still feel level>=1, the higher the level the less exact it needs to be.
> It just needs to be small and beautiful from resolution 21 and lower. While
> actually driving/riding/walking you will always use 24-22 (even 22 only in
> car I feel. Maybe 21 on highways).
>
> Those levels are important on PC and GPS device for orientation. And while
> actual switchback turns on a road would be quite worthwhile, those zig zag
> things aren't.
>
>
> _______________________________________________
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>
>
> --
> Felix Hartman - Openmtbmap.org & VeloMap.org
>
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
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>

-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
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