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[mkgmap-dev] [PATCH v2] modify road speed and class from a POI

From Felix Hartmann extremecarver at googlemail.com on Wed Oct 14 23:18:09 BST 2009

Mark Burton wrote:
> v2 - you can now have mkgmap:road-class-min and mkgmap:road-class-max
> tags (and the same for the road speed) that will limit the final value
> used. These can either be added to the POI (from whence they will be
> transferred to the way by mkgmap) or directly to the way.
Hi Mark,

Just a small question. If I add to a poi { add road_speed_min='-1'; add 
road_speed_min='1' } what happens if the original road had road_speed=0 
will it be increased or stay at 0?
(I assume and hope for the latter).

BTW I just updated Gpsmapedit and noticed that it has really really 
really good autorouting with the test "routing graph" function in its 
newest version. I managed to route 800km while Mapsource rarely does 
better than 100km. I contacted Konstantin to ask whether he will add a 
proper export function of the route. At least for my maps the routing 
with mapedit is really fantastic. Also it can now show the road_class 
and road_speed for any road correctly (did not do so in that I 
used previously).

> ---------------------
> This is something that was briefly discussed not too long ago and the
> idea is that a road's speed or class can be modified by the
> presence of a POI that defines new values for either/both of them. This,
> hopefully, will make ways that have stuff like traffic signals and
> crossings, etc. less attractive to route over.
> The values are specified using mkgmap:road-speed and mkgmap:road-class
> tags added to the POI.
> These tags expect an integer value, optionally preceded by a + or -
> which make the adjustment relative to the original value.
> For example, mkgmap:road-speed=3 sets the speed to 3 and
> mkgmap:road-speed=-1 reduces the speed by 1 from whatever value it had
> before.
> Here's some possible rules for the points file:
> highway=traffic_signals { add mkgmap:road-speed = '-1' }
> highway=crossing { add mkgmap:road-speed = '-1' }
> highway=mini_roundabout { add mkgmap:road-speed = '1' }
> The region of the way that has its speed/class modified is limited to
> the closest points either side of the POI. Not sure if that's the right
> thing to do yet. Needs playing with.
> You need to specify the --link-pois-to-ways option to enable this
> functionality.
> All feedback welcome.
> Mark
> ------------------------------------------------------------------------
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