[mkgmap-dev] Garmin Topo Europe map

Sun Jan 3 17:35:19 GMT 2021

Garmin city navigator maps use 23. Else a Europe map within 4GB is out of
question. However they use NT format too, which is about 1/3 smaller
additionally.

Same I guess for their Topo Europe maps.

On Mon, 4 Jan 2021, 01:03 Pierre Brico <pierre.brico at gmail.com> wrote:

> Hi Karl,
>
> Thanks for your analysis, very instructive. I've tried several of your
> steps and arrived at the conclusion that it's not a good idea to set the
> resolution to 23. Here are the 2 main reasons:
> 1. as you mentioned the map becomes less accurate, some roundabouts are
> converted into triangles, some line segments are misaligned ...
> 2. from the cgpsmapper guide: "IMG file should be created with Level 0
> equal to 24 – otherwise distance calculation might be wrong"
>
> Do you know if the Garmin TopoActive map uses resolution 23 or 24 ?
>
> Pierre
>
> On Sun, Jan 3, 2021 at 8:21 AM 7770 <7770 at foskan.eu> wrote:
>
>> Hi.
>> I made a few tests to lower the size of the maps.
>>
>> Comparison is made to my standard map which is based on the styles
>> example in
>> mkgmap but extended a bit for my purposes. This has 100 % size.
>> There are 4 levels, 24 is the most detailed resolution.
>>
>> Setting the resolution to 23 and changing relevant polygons, lines,
>> points to
>> show at 23 instead of 24. 4 levels (option file).
>> Size 78 %.
>>
>> Setting the resolution to 23 and changing relevant polygons, lines,
>> points to
>> show at 23 instead of 24. 3 levels (option file). levels = 0:23, 1:20,
>> 2:18
>> Size 64 %.
>>
>>
>> Using my minimal style (discussed earlier in this thread).
>> Compared to normal map, it is about 75 % in size.
>>
>> Using minimal style and
>> Setting the resolution to 23 and changing relevant polygons, lines,
>> points to
>> show at 23 instead of 24. 4 levels (option file).
>> Size 63 %.
>>
>> Using minimal style and
>> Setting the resolution to 23 and changing relevant polygons, lines,
>> points to
>> show at 23 instead of 24. 3 levels (option file). levels = 0:23, 1:20,
>> 2:18
>> Size 51 %.
>>
>>
>> I noted that when resolution is set to 23 polygons smaller than the
>> mentioned
>> raster at ~4.8 m disappear. They also do get distorted. Buildings are
>> such
>> polygons that are effected a lot, and it is (in my opinion) a good idea
>> to
>> disable buildings and similar polygons entirely when lowering the
>> resolution.
>> Coast lines and alike become less detailed of course.
>> Some line segments have become a bit misaligned (i noted bus stop
>> platforms
>> and similar short lines can have this issue).
>>
>>
>> I yet have to check how well these maps work on a unit but it seems
>> possible
>> to lower the size quite a lot if it is desired.
>>
>>
>> Regards
>> Karl
>>
>>
>>
>>
>> On onsdag 30 december 2020 kl. 13:27:06 CET Vuki wrote:
>> > Hi,
>> >
>> > am also working on a "lite" style and there may be some nice idea in
>> yours
>> > to use :) will check that out, thanks!
>> >
>> >
>> > Köszi:
>> > Vuki
>> > On 2020.12.30. 12:08, 7770 wrote:
>> >
>> > Hi.
>> > I am ok with sharing the style, but i was not able to do it until today
>> > (planned today or tomorrow).
>> > 5 files attached, 4 related to style, 1 to TYP (foskan.txt).
>> > Only those 4 style files have changes, compared to the standard.
>> >
>> > The complete set of files is ./mkgmap-rNNNN/examples/styles/default/
>> >
>> >
>> > There is nothing fancy nor complex, nor have i played around with the
>> levels
>> > yet.
>> >
>> > For reference i also added my TYP-file, which may help in case you find
>> some
>> > type codes which are non standard (there might be a few). The type file
>> is
>> > shared and does contain a few things that are not used by the minimal
>> style
>> > (don't get confused).
>> >
>> >
>> > Summery of the style, which is based on the default mkgmap example.
>> > All changes comments are marked with ## to be able to tell them apart
>> from
>> > regular comments given after #.
>> >
>> > polygons and points do have a lot of disabled information.
>> > Buildings, shops, and most of the parking types are disables.
>> >
>> > lines doesn't have as many changes and probably a few more small
>> waterways
>> > (streams, rapids, waterfalls) can be disabled to remove yet a bit of
>> data.
>> >
>> > note for polygons.
>> > Waters and forests are still visible, since it adds information to the
>> map,
>> > but if natural objects are not important for you, there is more space to
>> > save.
>> >
>> > i have made one change in lines file to display the road name on
>> tertiary
>> > roads instead of the reference. this does make sense in nordic
>> countries,
>> > where tertiary roads are usually only referred to with the name.
>> >
>> > Ski lifts (arealways in general) are set in similar way as railroads.
>> >
>> > One last thing to mention is that i have updated the inc/address file.
>> > Close to the end there is a section in which the mkgmap:phone is
>> updated to
>> > show information about which fuels are sold at fuel stations. This is
>> not
>> > fully complete for all fuel types but the ones i somehow considered
>> > important. Depending on where one is, a few more fuel types can easily
>> be
>> > added.
>> >
>> > A note.
>> > The mkgmap:phone seems to be 50 characters maximum, longer data will be
>> > truncated and not shown on the device it seems.
>> >
>> >
>> > Regards and happy new year!
>> > Karl
>> >
>> > On onsdag 30 december 2020 kl. 10:16:51 CET Vuki wrote:
>> >
>> > Hi Karl,
>> >
>> > don't you want to share your minimal style? :)
>> >
>> >
>> > Köszi:
>> > Vuki
>> > On 2020.12.27. 20:59, 7770 wrote:
>> >
>> > Hi.
>> > A few observations about the TopoActive europe map. (i have it on a
>> GPSMAP
>> > 66st).
>> >
>> > The map is rendered slower than most custom made maps.
>> > Updates occur 2 times per year, but even at those times many changes to
>> OSM
>> > are not present. Perhaps they only update some parts yearly.
>> > Points lack all kind of additional information which other mappers add
>> > (opening hours, region, phone numbers, etc.).
>> > One nice thing is colour marked national parks and reserves.
>> > Being an outdoor map, it lacks some information about shelters in the
>> > wilderness.
>> > Routing is possible only for outdoor activities (cycle, walk, hike,
>> direct),
>> > automotive routing (car, motorcycle) is disabled.
>> >
>> > I have tried creating a minimal style. This lowers the data to about 75
>> % or
>> > my normal set up. But i did not change the level, which i will try :-)
>> > Currently I am no way near the compression which TopoActive achieves.
>> Using
>> > input data which is about 6,7 GB in pbf format, creates a gmapsupp just
>> > below 4 GB for normal and around 3 GB for minimal style. These numbers
>> > feels similar to getting France into 1.9 GB from 3.7 GB pbf (geofabrik).
>> >
>> >
>> > The minimal set up is not very fancy at all, it disables things not
>> wanted.
>> > Buildings, shops, most of parkings, and a bit more.
>> >
>> > Today i cannot send off any style, but in case that would be of
>> interest let
>> > me know and i can share it in a few days (guessing Wednesday or
>> Thursday).
>> >
>> >
>> > Regards
>> > Karl
>> >
>> > On söndag 27 december 2020 kl. 20:08:10 CET Gerd Petermann wrote:
>> >
>> > Hi Pierre,
>> >
>> > my first guess would be that the level 0 is at resolution 23 instead of
>> 24.
>> >
>> > Gerd
>> >
>> > ________________________________________
>> > Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
>> > Pierre Brico <pierre.brico at gmail.com> Gesendet: Sonntag, 27. Dezember
>> 2020
>> > 19:37
>> > An: Development list for mkgmap
>> > Betreff: [mkgmap-dev] Garmin Topo Europe map
>> >
>> >
>> > Hello guys,
>> >
>> > I've just discovered the Garmin TopoActive Europe map based on
>> OpenStreetMap
>> > data. This map is sold at a price of 50€ or is pre-installed on some new
>> > devices. I've just seen it on the device of one of my friends and it
>> looks
>> > very good. I'm surprised to see that for West Europe, it takes only
>> 2.8GB
>> > and is quite complete (index for search, routable, ...).
>> >
>> > For now, I generate my own maps based on your excellent tool but the
>> result
>> > is much bigger (1.9GB only for France with probably more details). So,
>> my
>> > question is: does anybody have a similar configuration (style files and
>> > command line) to obtain a result like the Garmin TopoActive Europe ?
>> >
>> > Thanks,
>> > Pierre
>> > _______________________________________________
>> > mkgmap-dev mailing list
>> > mkgmap-dev at lists.mkgmap.org.uk
>> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>> >
>> >
>> >
>> >
>> > _______________________________________________
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>> > mkgmap-dev at lists.mkgmap.org.uk
>> > http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
>>
>>
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>
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