[Imports] Slovenia - Countrywide administrative borders update

Stefan Baebler stefan.baebler at gmail.com
Sun Feb 23 08:59:09 UTC 2020


At the end of January the Mapping Authority of Slovenia published slightly
adjusted municipal and city borders. They are now both aligned with the
cadastral parcels, so that a single parcel is in a single city and
municipality instead of being possibly split into multiple cities and

Announcement at https://egp.gu.gov.si/egp/?lang=en says:


   Changes of the Spatial Units Register data

   On the basis of the article 27 of the Act Amending the Real Estate
   Records Act - ZEN-A (Official Gazette RS, No. 7/18), the Surveying and
   Mapping Authority entered in the records of Spatial Units Register data
   changed boundaries of municipalities.

   This has resulted quite a few changes in the graphical data of the
   Spatial Units Register data - the changes were made for: 212
   municipalities, 3,143 settlements and 5,030 spatial districts. As a result
   the data of other spatial units bound to one of the changed units, have
   also changed.

To see what this means in practice I have prepared the comparison for one
of the municipalities on github at:
[image: image.png]
Green=new official data (after 2020-01-31)
Red=old official data (before 2020-01-31)
Blue=OpenStreetMap data (on 2020-02-12
<https://www.openstreetmap.org/relation/1675857#map=19/46.11460/14.42120> )

As expected, borders in OpenStreetMap align well with the old official
data, but new official borders are significantly different in some places.

Has anyone ever performed such an update in a non-painful manner? I am sure
that some border ways are (wrongfully) shared with paths and natural
features, so we cannot just delete all the old data, but it has to be done
selectively. Also some tags from OSM (wikidata, wikipedia...) will need to
be preserved.

Any suggestions how to approach such an update?

We might also consider adding next administrative level city borders while
we're at it.

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