[Imports] N50 imports from Kartverket (The Norwegian Mapping Authority)

[Christoph Hormann]

On Sunday 22 June 2014, Tor wrote:
>
> As far as I know, they are split that way in the SOSI files from
> Kartverket. I agree that it’s best to merge them. I have no idea
> about how to do that with OGR though.

In principle dissolving all polygons in a file can be done through 
something like

ogr2ogr -explodecollections -dialect SQLite -sql "SELECT 
ST_Union(geometry) FROM input" output.shp input.shp

If you only want to merge elements with certain attributes you need some 
more SQL magic with 'group by'.

> Not in the N50 Arealdekke dataset as far as I know. The names are in
> a separate N50 dataset. It has been discussed on the Norwegian
> mailing list, and people agreed that it would be better to import
> names from the original source, the place name register (sentralt
> stadnamnregister, SSR).

Well - it is of course up to you but if there are matching data sets it 
is usually easier to attach names to certain features and then import 
the whole thing than add name tags to existing OSM elements later when 
they might have already been modified manually.

-- 
Christoph Hormann
http://www.imagico.de/