[Tagging] How can I display maxspeed on my Garmin?

Gerd Petermann GPetermann_muenchen at hotmail.com
Fri Jul 22 07:11:36 UTC 2016


Hi Dave,


I agree that it is not trivial because the rules which set the highway name are already quite complex.


I think you have to add a rule like this:

highway=* & maxspeed=* {set xxx_maxspeed_label = '($(maxspeed))'}
somewhere at the beginning of the lines rules, I leave it up to you to add rules

to convert the value to mph or add a unit, see also inc/roadspeed


Next you have to change all the rules which use the name

macro for highways.

Example for trunk roads:

change the rule

highway=trunk {name '${ref|highway-symbol:hbox} ${name}' | '${ref|highway-symbol:hbox}' | '${name}'; addlabel '${name} (${ref})' }

to

highway=trunk {name '${name} ${ref|highway-symbol:hbox} $(xxx_maxspeed_label)' | name '${name} ${ref|highway-symbol:hbox} ' | '${ref|highway-symbol:hbox}' $(xxx_maxspeed_label)' |'${ref|highway-symbol:hbox}' | '${name} $(xxx_maxspeed_label)' | '${name}'; addlabel '${name} (${ref})' }


If that doesn't help, I suggest to pose the question in the mkgmap experts list:

mkgmap-dev at lists.mkgmap.org.uk


Gerd
________________________________
Von: Dave Swarthout <daveswarthout at gmail.com>
Gesendet: Freitag, 22. Juli 2016 07:07:08
An: Tag discussion, strategy and related tools
Betreff: Re: [Tagging] How can I display maxspeed on my Garmin?

I understand that. I'm  not asking for reverse engineering, only for a way to write a style rule that appends the maxspeed tag value to the output string that ends up being the name Garmin shows on the unit.

Let me put it another way. It seems to me that if one can use a style in such a way to display a road name from the name tag, plus a route number from the ref tag, then it ought to be possible for me to create a style that will show the value of the maxspeed tag. I mean, certain of the style directives (like the ones in my snippet) only create labels that are referenced later when styles are actually being applied to objects during map creation. Instead of seeing "driving on Ak 9 (Main Street)"  on my Garmin screen I want to see "driving on Main St (Ak 9)(30 mph)".  It should be possible to make a style rule to create that result. I'm just not clever enough to figure out how.


On Thu, Jul 21, 2016 at 8:02 PM, Warin <61sundowner at gmail.com<mailto:61sundowner at gmail.com>> wrote:
Dave,
Garmins mapping has evolved over time. It is not open source nor do they release the commands etc that they use.
So things are reverse engineered to get Garmin maps from various sources (including OSM).
While maxspeed may be important for some .. it may not be high on the list of things to do for those doing the reverse engineering.
So in terms of getting it on your Garmin .. not now. But maybe in the future.


On 7/22/2016 6:31 AM, Gerd Petermann wrote:

Hi Dave,


"there's no known way to simply append that tag to a label or highway name. Correct?"

no, I think that should be possible when the way has the maxspeed tag.

I refered to a different feature which shows a road sign with the maxspeed value

and also allows to warn the driver when he is faster.


Gerd

________________________________
Von: Dave Swarthout <daveswarthout at gmail.com><mailto:daveswarthout at gmail.com>
Gesendet: Donnerstag, 21. Juli 2016 22:18:54
An: Tag discussion, strategy and related tools
Betreff: Re: [Tagging] How can I display maxspeed on my Garmin?

Thanks for the responses.

I assumed because we can append ref tags to a highway name one could just do the same for maxspeed.  It's just another tag after all. Obviously, there is a lot of interplay between mkgmap and the Garmin internals that I don't understand.

Gerd, what you're saying is that there's no known way to simply append that tag to a label or highway name. Correct?

Dave

On Wed, Jul 20, 2016 at 11:11 PM, Gerd Petermann <GPetermann_muenchen at hotmail.com<mailto:GPetermann_muenchen at hotmail.com>> wrote:

Well,


the default style rules in mkgmap evaluate maxspeed to calculate a so called road speed value which is used

by the Garmin routing algo.

But we don't know any way to store the value in the map so that it woud show up in the device when you

pass the node. I know that modern Garmin maps have this feature using so called NT maps, I don't know

any place in the older img format where this information could be stored, but maybe we just didn't find

it yet.


Gerd

________________________________
Von: Paul Johnson <baloo at ursamundi.org<mailto:baloo at ursamundi.org>>
Gesendet: Donnerstag, 21. Juli 2016 08:55:27
An: David Swarthout; Tag discussion, strategy and related tools
Betreff: Re: [Tagging] How can I display maxspeed on my Garmin?

On Tue, Jul 19, 2016 at 7:07 PM, Dave Swarthout <daveswarthout at gmail.com<mailto:daveswarthout at gmail.com>> wrote:

I posted this on the Garmin OSM forum but nobody responded. Maybe someone here can help with this.

I recently added maxspeed to many highways in my neighborhood and am looking for a way to have them display on my Garmin Montana. Mostly I would use this information while driving here and there to show me roads that don't have a maxspeed tag already. I'm looking for a style directive that will append maxspeed information to the highway-symbol and ref for the standard highway types.

I'm not currently aware of anything in the OSM to Garmin toolchain that is capable of encoding maxspeed as of yet.  As far as I'm aware, the only data consumer that is using lane or speed data is Osmand at this time.

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Dave Swarthout
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Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com



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_______________________________________________
Tagging mailing list
Tagging at openstreetmap.org<mailto:Tagging at openstreetmap.org>
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--
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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