[mkgmap-dev] Sensible resolutions - (or patch 5)

Sat Mar 26 10:51:46 GMT 2011


On 26.03.2011 08:12, Marko Mäkelä wrote:
> On Sat, Mar 26, 2011 at 02:06:11AM +0100, Felix Hartmann wrote:
>> Well then add a note to the options file, that while it is nicer and 
>> faster on the GPS to draw (if level 21 and 19 are included) - however 
>> it adds up 15% to filesize of gmapsupp.img (though I don't get how 
>> you get 15% when I get around 5% - well that's with exporting from 
>> Mapsource where the mdr file takes up quite a lot of space too).
>
> One thing that I did not measure was the impact of the additional tile 
> splitting, without changes to the options.
>
>> What is your commandline options?
>
> Pretty basic, see http://www.polkupyoraily.net/osm/files/mkgmap.args 
> (this is the version before the additional splitting).
>
>> Also I don't really sea why healthcare polygons should be visible
>> already at resolution 22. I think 23 (so 24 for everyone who does not
>> use 23) is enough. Essentially it's no more important than plain houses
>> in my opinion.
>
> I was trying to be consistent with amenity=hospital, but I guess we 
> could lower amenity=hospital to 23 as well. Hmm, there is no 
> amenity=doctors in the polygons file. I will add that too.
Well, for what I noticed on actual usage is that doctors, hospitals and 
dentist get tagged themselves. All other stuff e.g. especiall care 
related like chiropody or similar stuff you would not find on a general 
purpose map, gets thrown into healthcare. Therefore I would show 
amenity=hospital & ( amenity=healthcare & healthcare=hospital )  at 
resolution 22, include amenity=docotors at 23 and add healthcare to 23 
(if not 24). The reasoning has to go that important stuff is shown 
early. While a central train station is shown early, tram stations are 
showing up later...
>
>> highway=service at 23 is another thing I'm not too happy. Often 
>> highway=service connect residential roads and tracks.
>
> I haven't seen that around here. The highway=service are usually 
> driveways and parking aisles, not for passing through (at least not by 
> motor vehicles).
>
>> That's why I put them to 22. Maybe a finer seperation would be needed 
>> using service=* tag.
>
> What would you suggest? Do you agree that service=parking_aisle should 
> be 23 or 24? What about service=alley and service=driveway? I have 
> drawn lots of tiny service=driveway that connect properties to a 
> highway=residential or highway=tertiary and intersect with a 
> cycle/footway. It would seem awkward if service=alley were visible 
> before service=driveway or service=parking_aisle, because alleys are 
> even more minor.
yeah, that is okay on the final patch.
>
>     Marko