OpenStreetMap
Putting my changeset comment here (for changeset http://www.openstreetmap.org/browse/changeset/6325940) as it won't fit in the comment tag.
Add land parcels (cadastral boundaries) from best guess from nearmap imagery, and add street numbers and apartment block names from survey to these parcels. boundary=cadastre is something I just made up, will need to discuss the use of this further. Unable to assign the role street to the associatedStreet relations because you need to make a relation containing all the segments of the street, and how to do that is not well agreed upon (multipolygon, collected way, route?).
Discussion
Comment from EdLoach on 9 November 2010 at 09:15
Two possible solutions to your associatedStreet issue. Either create a separate associatedStreet relation for each street segment, which might lead to more accurate routing as house numbers would be associated with a smaller section of the street. Or just stick all the street segments in the one associatedStreet relation and give them all role street and don't worry too much about the wiki saying it can only have one item with role street - just one is fine when you are creating the relations initially, but if someone comes along and then splits the street for whatever reason you'll end up with multiple street items in existing relations anyway (if I understand how JOSM and Potlatch deal with splitting ways that are relation members correctly).
Comment from aharvey on 9 November 2010 at 10:37
Thanks for the advice!
I thought about using a separate associatedStreet relation for each street segment. I decided not to do this as I think it creates an unessesary burdon on people who further split up or merge the street segments, who would then need to also adjust these relations. In my view, that person should not have to worry about this.
For the second solution, I'm worried that things are not abstracted very well.
The segments of the street should only be grouped together once (whether that be street, collectedWay, route, multipolygon, etc...). Adding them all as the street role in the associatedStreet relation just uncessarily duplicates this information.
If there was some universally agreed upon way to group objects, then there would only be one object with name=street_name, and I could tie that object into the street role of the associatedStreet.
I hope that makes sense.
Comment from lubosb on 10 November 2010 at 20:38
Why not create buildings like here:
http://www.openstreetmap.org/?lat=48.878309&lon=18.044482&zoom=18&layers=M
e.g. housenumber 1 is different bulding from housenumber 3 and land lot border between them, that thin line in Mapnik image is land lot border.
this is how it look in real (its from real estate web, green house and another brick house):
http://www.vety.sk/fotky/0015/1578_12541.jpg?r=9827
IMHO, cadastral border can be useful for buildings, but you can create two buildings with few nodes which share both of them and use existing building=yes for these 2 closed areas.
BTW, cadastral border (land lot border) in Slovakia is defined as border of administrative boundary, border of cadastral office, border of built up area, property boundary (?ownership boundary?), boundary of tenancy, boundary nature of land usage. IMHO a lot of not so useless data.
(as you can see, english is not my native language)
Comment from lubosb on 10 November 2010 at 20:48
Here is comparison OSM (from JOSM) and slovak cadastre
http://img440.imageshack.us/img440/2455/josmokapor.png
housenumber 3 stay on landlot 2316/40 and there are two another land lots which belong to this house 2316/72 (:/72) as front yard and 2316/73 (:/73) as backyard. Of course, street is another land lot and field behind backyard on west (right) is another land lot.
Comment from aharvey on 11 November 2010 at 05:57
@lubosb
If someone wants to add buildings here to they are free to do that. Personally I see more value in the land parcel, so that is what I've added. At least for the area I mapped as far as I am aware street numbers are tied to the block of land not a building, so that is what I mapped them as.
Even though I've tagged these as boundary=cadastre, I'm not really sure what they are called. I've just mapped out where the fences are for different blocks of land.
I don't think I'll be doing much more of this (tracing residential land boundaries) though, it takes a huge amount of time and at the end of the day the accuracy is bad. I wish I had a free source of cadastral boundaries from the government department, that would make things a lot easier.