[mkgmap-dev] Garmin Topo Europe map

Mon Dec 28 18:35:53 GMT 2020

Hi Pierre,

If you use resolution 24 you can remove details like buildings and use high values for filters like --reduce-point-density.
You may decide to not render polygons like landuse=farmland|meadow|grass and so on.

Reg. address search and buildings: I asked about the Garmin map. If they don't render buildings this will save a lot of bytes. Address search (--housenumbers) also adds data. Next thing to look at is the DEM data and / or contour lines.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Pierre Brico <pierre.brico at gmail.com>
Gesendet: Montag, 28. Dezember 2020 19:21
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Garmin Topo Europe map

Yes:
- there is no building anymore
- address search is still working

Is it possible to restore the accuracy of resolution 24 while keeping other parameters identical (I mean no building, no POI, ...)?

On Mon, Dec 28, 2020 at 5:20 PM Gerd Petermann <gpetermann_muenchen at hotmail.com<mailto:gpetermann_muenchen at hotmail.com>> wrote:
Hi Pierre,

yes, it is possible and expected. Resolution 23 means a raster of ~4.8 m. I assume the Garmin map contains no buildings. Does it allow address search?

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Pierre Brico <pierre.brico at gmail.com<mailto:pierre.brico at gmail.com>>
Gesendet: Montag, 28. Dezember 2020 17:16
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Garmin Topo Europe map

Hi Gerd, Karl,

Thanks for your interesting information.

@Gerd,
I've tried to generate a map with a resolution of 23. During the processing, I've received a lot of messages like "SEVERE (TypeReader): 63430028.osm.pbf: Type 0x07 min-res:24 will not be written with level 0 at resolution 23 in style file lines, line 215 -> routing may not work".
This was due to some rules in the "lines" file of the default style. I modified them from "resolution 24" to "resolution 23" as my goal was to keep all ways and to obtain a routable map. The issue was solved.
Looking at the result, I can see that details (useless for me like buildings, POI, ...) have disappeared and the map size is now 142MB instead of 242MB for Belgium. Excellent !!
The strange thing is that the result seems less accurate. It looks like some nodes have been removed. For example, a roundabout is drawn as a triangle. Is it possible?

@Karl,
Here is a description of the TopoActive map (West part):
TopoActive Europe 2020.20 South West 2.92 GB (3,139,764,224 bytes)
Andorra, Belgium, France, Iceland, Ireland, Italy, Liechtenstein, Luxembourg, Malta, Monaco, Netherlands, Portugal, San Marino, Spain, Switzerland, United Kingdom, Vatican City, Albania, Bosnia and Herzegovina, Croatia, Greece, Kosovo , Macedonia, Montenegro, Serbia, Slovenia
If I take all these countries in Geofabrik, the total size is 10,4GB. So the ratio is 3.56. From my example of Belgium above, the ratio was 2.8 but I need to examine what can still be removed to gain some more space.
Anyway, I'm interested in your 'optimized' style.

Thanks again,
Pierre

On Sun, Dec 27, 2020 at 9:00 PM 7770 <7770 at foskan.eu<mailto:7770 at foskan.eu><mailto:7770 at foskan.eu<mailto:7770 at foskan.eu>>> 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<mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk><mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk>>> im Auftrag von
> Pierre Brico <pierre.brico at gmail.com<mailto:pierre.brico at gmail.com><mailto:pierre.brico at gmail.com<mailto: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
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