[Imports] [Talk-es] [Cat2Osm2] Tool for exporting Spanish Cadastre data in OSM suitable format

[Sarah Hoffmann]

On Thu, Feb 28, 2013 at 08:36:15AM +0100, Cruz Enrique Borges wrote:
> > Usefulness is in the eye of the beholder. While you may find it interesting
> > to have all this 3D information, I'd find it much more useful to have building
> > outlines in OSM that are complete. The single building parts make not much
> > sense for anything but 3D rendering. 
> 
> For us is a _vital_ information. We are making models of the urban sprawl of 
> several cities and the hight of a building give us a lot of information
> about the type and the number of person who can live in that building.

It is exactly this kind of analysis that you make unnecessarily
difficult. Take Paul's example
http://maps.paulnorman.ca/imports/review/cigarral/building.png

>From the aerial images it looks like 2, maybe 3 free-standing houses for
a single family. It is very difficult to determine that from the
data you imported because the houses consist of 3 to 5 separate
building ways all of them tagged in exactly the same manner.  You 
will need to do a complicated geometric analysis and add a lot of 
guess work to determine the actual number of houses.

Note that I am not against adding 3D information to the buildings,
I do object to splitting buildings into dozens of small parts that
in reality are just some architectural decoration. OSM is supposed
to be a map, a minimal level of abstraction is necessary to make the
data usable.

> > And I suspect that they are going to
> > give you a big headache once you get around to mapping addresses.
> 
> I don't think so. The address is already in the building or in the parcel (it's an
> step of the import process).

Naturally.

Sarah