Could you link to an example?
DaveF
On 25/10/2017 16:36, Gaurav Thapa wrote:
"2. Buildings.
If 2 buildings share a wall or are constructed one aside the other
(double wall), you should have them connected in OSM as well."
In Nepal we have been trying to make sure that each constructed
building has its own footprint and is not connected to a neighbouring
structure via a shared wall. We do this as in reality this is the case
as each building structure though built next to each other has its own
footprint (independent foundation). We have changed many buildings
that have been drawn as suggested by you Martin (previously traced by
remote mappers especially in highway towns of Nepal).
So, there if there is a set of rules it would help us as well.
Regards
On Wed, Oct 25, 2017 at 4:48 PM, Martin Koppenhoefer
<[email protected] <mailto:[email protected]>> wrote:
2017-10-25 11:50 GMT+02:00 Tomas Straupis <[email protected]
<mailto:[email protected]>>:
Hello
For a long time I wanted to hear opinion on the topic of
topology rules.
By "topology rules" here I mean just simple rules such as:
* polygon X should not overlap polygon Y
* polygon X should always be above polygon Y
* point X should be not further from line Y than D
etc.
most important is IMHO: when do you share nodes, and when not.
1. E.g. political boundaries usually should reuse the same border
ways (=no gap between entities).
Other examples:
2. Buildings.
If 2 buildings share a wall or are constructed one aside the other
(double wall), you should have them connected in OSM as well.
If a square is delimited by buildings, the place=square object
should share ways with the buildings.
etc.
Some mappers tend to map these things very close but distinct,
which IMHO is a topology error.
The rule I want to see: map in a way that it represents reality
nicely.
3. Roads and areas:
Some mappers connect "incompatible" object types (centre lines of
roads and areas). The areas should end at their border and not be
extended.
Cheers,
Martin
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Gaurav Thapa
Project Manager
Secondary Cities Pokhara Project
Kathmandu Living Labs
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