[mkgmap-dev] [PATCH] reduce highway=service resolution

Mon Aug 10 23:31:30 BST 2009

On Mon, Aug 10, 2009 at 09:14:59PM +0200, Ondrej Novy wrote:
[...]
> It think we should set resolution for residential streets back to 21, now is
> map just 'empty'.
> 
> If we want to have this set to resolution 23 we need to update more than
> just service, but parking and track for example too.
> 
> So i'm voting to set residential back to 21 :].

+1

I maybe started this whole thing by raising building in
commit 1109. Despite nobody complaining about this
particular one, I now learn, that we should be more careful
about just "randomly" changing resolutions.

I think residential at 21 is a good "reference point" and
we should layout things around this reference point. Like
"We only need to see a restaurant after already seeing the
residential streets and zooming more in" (random example. I
assume restaurants have the right resolution).

I don't know, if we really want to go ahead and create more
styles directly shipped with mkgmap.
Just some random thoughts:
Pro:
- There are maybe some people who will love some choices
  for styles to choose from. Like a "car", "bicycle",
  "foot", "topo", "hiking" ones...

- We would probably need to improve our styling to allow
  more tricky things like "Just change the resolution for
  this item, but keep everything else".

  I tried this by adding an appropiate normal rule to the
  "elrond" style.  Guess what? I forgot about the ordering
  and a higher priority normal rule didn't kick in and
  routing was b0rked.

Con:
- We would end up trying to support >6 styles and trying to
  keep them useful. I wouldn't know at which levels to add
  a man_made=wastewater_plant (we don't have that one yet)
  for all those styles above.

  One could add it in the "common" style first and anyone
  more familiar with the "bar" style can override it for
  that style.

Elrond