What ever solution we are going to use. By rendering all countries,
the relative picture should be the same.
Prominence 4 in America is a city with a lot more inhabitants then a
prominace 4 in Belgium. Knowledge of the country should decide the
prominence. To have a clear discussion, every country should define
the rules on wich the prominence is made. (future-proof)
for example:
On a high zoom level e.g. prominence => 7 should be visible. On a
higher zoom level lower prominences will become visible.
In that case users of our data can choose if they are using the
adminstatative or the prominence rank to build up there map.
-robert-
Citeren Steve Bennett <stevag...@gmail.com>:
On Wed, Jan 19, 2011 at 4:27 PM, John Smith
<deltafoxtrot...@gmail.com> wrote:
The problem here is subject v objective tagging, in terms of airports
this can be objective stated based on international flights a day and
the same with cities, if you want to indicate population tag
population, take for example some regional 'cities' in Australia some
have 50,000 or less people but still call themselves a city.
Yes, that's right. A map that is based 100% on objective, indisputable
facts with no interpretation is unlikely to be the best possible map.
How do we handle differences in interpretation? We'll need processes.
And I think you give a good example. If there is only one town of any
description in the middle of a vast desert, it ought to be shown at
even low levels of zoom. This is standard practice in many maps,
atlases etc. A town of 50,000 would barely even rate a mention in
France, whereas that's pretty big for Australia. And a town like Eucla
in the nullarbor (pop 50) has very high prominence as it's the only
place for many miles with accommodation.
Btw, Google does a much better job of this than Mapnik:
http://osm.org/go/s6Xrs
http://maps.google.com/?ie=UTF8&hq=&hnear=Moondarra+State+Park,+Moondarra+Victoria+3825,+Australia&ll=-32.676373,130.297852&spn=13.151424,11.491699&z=7
Steve
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