[mkgmap-dev] [Patch v4] sharp angles

Wed Sep 16 19:55:12 BST 2015

Hi Felix,

thanks for testing.
Please post a sample where --cycle-map is worse compared
to no-cycle-map. 

Gerd

Date: Wed, 16 Sep 2015 14:12:42 +0200
From: extremecarver at gmail.com
To: mkgmap-dev at lists.mkgmap.org.uk
Subject: Re: [mkgmap-dev] [Patch v4] sharp angles

okay - I tested around a bit more. Using v4 patch and cycle-map option - there was again rather no improvment. I did test out v4 patch without cycle map - and at least for my maps that seems to turn out better routing results (not always better streets, but on the same streets faster arrival times).
So I guess v4 and no --cycle-map is what I'm going to use.

On 16 September 2015 at 12:15, Carlos Dávila <cdavilam at orangecorreo.es> wrote:
El 07/09/15 a las 17:42, Gerd Petermann escribió:

Hi all,

attached is v4 of the patch.

Changes:

1) The option --x--fix-sharp-angles is gone.

2) A new option --x-ignore-sharp-angles can be used to disable

the code that enlarges sharp angles

3) The option --cylcle-map is now documented (not in detail,

as I still work them out). Please try if the option improves routing

in cycle maps. It allows changes up to 112° instead of only 45°.

4) known errors were fixed:

- use sum of speeds

- take into account that values maybe rounded when calculating

the new heading(s)

I have tested the patch and I find it doesn't avoid the "spurious instructions to "keep right/left" when the road doesn't actually fork". My test case is a route from SW to NE along A-471 (http://www.openstreetmap.org/#map=12/36.8685/-6.1225&layers=T) where I get several unnecessary keep right/left instructions at crossings with sharp angle links leaving A-471, such as the one at http://www.openstreetmap.org/#map=18/36.77762/-6.27642&layers=T The number of these unnecessary instructions is lower than without the patch (6 vs 9).

The map is produced with a general purpose style, not a cyclist one.

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-- 
Felix Hartman - Openmtbmap.org & VeloMap.org
Floragasse 9/11
1040 Wien
Austria - Österreich

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