[Tagging] Tags useful for rendering of roads in poor conditions

Fernando Trebien fernando.trebien at gmail.com
Tue Dec 31 22:54:09 UTC 2013

On Tue, Dec 31, 2013 at 7:27 PM, malenki <osm_ at malenki.ch> wrote:

> I wouldn't connect surface=compacted and tracktype=grade1 per default
> since compacted roads and and roads with really paved surface (asphalt
> or cobblestones) are not unlikely to show a very different driving
> experience after some good rain.
> Of course this also depends on your definition of "compacted". :)

This is an important point where it gets tricky to reach "global"
agreement. As a driver here in Brazil (and having driven abroad only in the
US, even though I've been using public transportation in other countries
too), my experience tells me that even a sett road has different
characteristics after rain. Sett becomes slippery and, thus, less safe
(even in sunny conditions it may be less preferable to some people). Any
unpaved road (compacted or not, but mostly not compacted ones) will not
only make your car dirtier but may increase the chance of bogging and it is
perhaps even less safe than wet sett streets. Exactly when these things
become relevant as to deserve different rendering is somewhat subjective.
My personal perception is that the largest difference appears when going
from paved to unpaved (thus, including "compacted" on the "unpaved" side);
the Brazilian community seems to disagree and includes "compacted" on the
"paved"-like side (mostly because many regions in Brazil have almost solely
unpaved roads). One possible solution is voting on various possible
thresholds and sticking with a single style change (my current aim, as I
think this is the fastest way to get results). In case of too much
disagreement, another solution is introducing various different rendering
styles for each of these situations (much like Carto's many rendering
styles of highway=track according to trackgrade; this could affect only
outlines of the ways). Other solutions may fall in between these two.

Fernando Trebien
+55 (51) 9962-5409

"The speed of computer chips doubles every 18 months." (Moore's law)
"The speed of software halves every 18 months." (Gates' law)
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