[Talk-us] Whole-US Garmin Map update - 2017-05-03

[Dave Hansen]

These are based off of Lambertus's work here:

http://garmin.openstreetmap.nl

If you have questions or comments about these maps, please feel
free to ask.  However, please do not send me private mail.  The
odds are, someone else will have the same questions, and by
asking on the talk-us@ list, others can benefit.

Downloads:

http://daveh.dev.openstreetmap.org/garmin/Lambertus/2017-05-03

Map to visualize what each file contains:


http://daveh.dev.openstreetmap.org/garmin/Lambertus/2017-05-03/kml/kml.html


FAQ



Why did you do this?

I wrote scripts to joined them myself to lessen the impact
of doing a large join on Lambertus's server.  I've also
cut them in large longitude swaths that should fit conveniently
on removable media.  

http://daveh.dev.openstreetmap.org/garmin/Lambertus/2017-05-03

Can or should I seed the torrents?

Yes!!  If you use the .torrent files, please seed.  That web
server is in the UK, and it helps to have some peers on this
side of the Atlantic.

Why is my map missing small rectangular areas?

There have been some missing tiles from Lambertus's map (the
red rectangles),  I don't see any at the moment, so you may
want to update if you had issues with the last set.

Why can I not copy the large files to my new SD card?

If you buy a new card (especially SDHC), some are FAT16 from
the factory.  I had to reformat it to let me create a >2GB
file.

Does your map cover Mexico/Canada?

Yes!!  I have, for the purposes of this map, annexed Ontario
in to the USA.  Some areas of North America that are close
to the US also just happen to get pulled in to these maps.
This might not happen forever, and if you would like your
non-US area to get included, let me know. 

-- Dave


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Re: [Talk-us] Speed limit editing in Detroit

[Tod Fitch]

> On May 6, 2017, at 1:11 AM, Paul Johnson  wrote:
> 
> 
> 
> On Sat, May 6, 2017 at 3:07 AM, Paul Johnson  > wrote:
> 
> 
> On Fri, May 5, 2017 at 7:55 AM, Horea Meleg  > wrote:
> 
> A lot of motorway_links don’t have a speed limit sign. Do you have any idea 
> where could we get the speed limit values from?
> In North America, ramps with speed limits are relatively rare, but following 
> the usual rule that the previous speed limit applies, the speed limit of the 
> off-ramp would be the same as the freeway itself unless otherwise posted, and 
> if the same ramp returns to the freeway contiguously, that speed limit would 
> continue to carry over to the on-ramp.  It's not very much more complicated 
> than that, but in practice, just leave off maxspeed on the ramps entirely 
> unless it's actually posted with a regulatory (white sign) speed limit or a 
> general speed limit is known (both relatively uncommon). maxspeed:advisory 
> would be far more common, as exit ramps are nearly universally posted with an 
> advised (yellow sign) speed.
> 
> Adding to my own answer again, I should say rather than "in practice, just 
> leave off maxspeed" but rather, "in practice, it never comes up so people 
> rarely tag it."  I don't mind adding these if folks consider that favorable 
> (I do see the value).
> 

From a end user of a routing app on my phone that uses OSM data, I’d rather 
have the maxspeed omitted from *_link ways if it is not signed. The reason is 
that there are some freeway/freeway ramp geometries where traveling by the ramp 
is slightly shorter than keeping on the freeway. I’ve seen cases where that 
caused the app I use to route me off the freeway and then immediately back on. 
If there is no maxspeed tag, I can set the default for the *_link such that I 
am not needlessly routed off and then back on a freeway.

I guess that is “omitting tags for the data consumer”, but since we are 
discussion situations where there is no sign and, in general, we tag what we 
see I don’t see that as being too far from the normal tagging philosophy.

Cheers,
Tod


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Re: [Talk-us] Speed limit editing in Detroit

[Paul Johnson]

On Sat, May 6, 2017 at 3:07 AM, Paul Johnson  wrote:

>
>
> On Fri, May 5, 2017 at 7:55 AM, Horea Meleg 
> wrote:
>>
>>
>>1. A lot of motorway_links don’t have a speed limit sign. Do you have
>>any idea where could we get the speed limit values from?
>>
>> In North America, ramps with speed limits are relatively rare, but
> following the usual rule that the previous speed limit applies, the speed
> limit of the off-ramp would be the same as the freeway itself unless
> otherwise posted, and if the same ramp returns to the freeway contiguously,
> that speed limit would continue to carry over to the on-ramp.  It's not
> very much more complicated than that, but in practice, just leave off
> maxspeed on the ramps entirely unless it's actually posted with a
> regulatory (white sign) speed limit or a general speed limit is known (both
> relatively uncommon). maxspeed:advisory would be far more common, as exit
> ramps are nearly universally posted with an advised (yellow sign) speed.
>

Adding to my own answer again, I should say rather than "in practice, just
leave off maxspeed" but rather, "in practice, it never comes up so people
rarely tag it."  I don't mind adding these if folks consider that favorable
(I do see the value).
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