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

[Christoph Hormann]

On Sunday 22 June 2014, Tor wrote:
>
> New example files with OSM tags: <http://mehus.dk/osm/lyngen2.zip>
>
> Feartures without suggested tagging on the N50 wiki page have been
> left out.

Ok - first of all thanks for that.

A few observations of problems in addition to those you already 
mentioned:

- the source tag should probably go into the the changeset and not be 
applied to the individual features unless it varies.
- the source:date tag is misleading since it specifies the date of the 
import and not the date of the source itself.  If there is some date 
information in the source data it might make sense to maintain it but 
the import date is easily visible from the changeset.
- The splitting of the natural=wood polygons at arbitrary straight lines 
is not a good idea.  I know the Canvec import kind of set a precendent 
here by doing such splits almost universally but this is really a 
nightmare in terms of data maintainence.  If the polygons get too large 
they can be split at natural boundaries like rivers, roads etc.  
Merging touching polygons with identical attributes should be 
relatively easy with OGR before conversion to OSM.
- there are coastline ways tagged place=islet without being a closed 
loop.
- except for the incorrect direction there are some peculiarities about 
the waterways - like unconnected closed loops tagged waterway=stream.  
Looks like either the source data is really quite a mess here or there 
are some conversion errors.
- there do not seem to be any names of lakes, rivers, islands etc. - are 
there none in the soure data?

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