[Imports] Building outlines/footprints in Strzelce-Drezdenko county

andrzej zaborowski balrogg at gmail.com
Sat Dec 14 04:56:05 UTC 2013

On 14 December 2013 00:57, Jason Remillard <remillard.jason at gmail.com> wrote:
> Hi Andrzej,
> Some quick feedback.


> First off on process.
> - We need to see all of this info pushed into an import wiki project page.

Ok, will add it once confirmed.

> - We would like to see some OSM files you have not uploaded yet for review.

http://openstreetmap.pl/balrog/starekurowo.osm.bz2 is the data for the
remaining municipality.  Not conflated because I'd later need to redo
it to avoid conflicts with new edits.

> On the tagging
> - You have the source tag on the changeset, you don't need it on the
> buildings. If you want to see the different between survey/raster,
> break them up into different change sets.

Well I've heard arguments for both ways, but the local consensus is
towards having the source= tags on objects.  Also the fact that you'd
have to split your edits between sources instead of grouping logically
according to your mapping habits makes me think they belong on the
objects (although obviously the value only applies to those edits,
where the source= tag changes its value)

> - I would also kill the building:type:pl tag, and try to translate it
> into one of the established building= values.
> Just import them as building=<something>.

I'm already using building= values if I can derive them from that
info, but the original data doesn't have actual information on the
building's use except if it's a greenhouse, a ruin, a foundation, etc.
 The other tag may tell you whether a given shape is the outline or
the footprint, sometimes other bits not captured by building=*.

> Lastly, could you add a description *what* address merge script does,
> perhaps into a header in the file.

Added a description in
good point.

> Thanks
> Jason
> On Fri, Dec 13, 2013 at 10:38 AM, andrzej zaborowski <balrogg at gmail.com> wrote:
>> Hi,
>> I was asked to help with the import of cadastral data for a few
>> municipalities in the Strzelce-Drezdenko county in Poland.  Here are
>> some details of this import, which is partly done already, but I'm
>> going to wait with further upload.
>> Technical:
>> The data is in shapefile format which looks like a direct conversion
>> of the data internally (I belive) kept as a DXF by the antique
>> software GIS offices use, which means it's basically a vector drawing
>> rather than a geospatial database.  I believe SQ9NIT, the user who
>> imported the two initial municipalities, used grassgis tools to
>> convert the wall segments into closed shapes and sanitize them, and
>> added the following tags:
>> building=yes
>> source=Starostwo Powiatowe Strzelce Krajeńskie
>> I have used the set of python scripts at
>> https://github.com/balrog-kun/ewmapa2osm to produce OSM data, which
>> relied on the line type attribute to set proper tags based on some
>> manuals published by the company who I believe made the original
>> software used by county geodesy service.  Specific tags are documented
>> in the python code, but basically it's building=* and
>> building:type:pl=*.  I used two source= values:
>> Starostwo Powiatowe Strzelce Krajeńskie, survey
>> Starostwo Powiatowe Strzelce Krajeńskie, raster
>> depending on whether the original data indicates a given outline was
>> surveyed.  Building height and usage information is unfortunately not
>> in the shapefiles I got for that particular county, must have been
>> filtered out.  I have already imported data for three of the
>> municipalities using the account balrog-kun-imports with one chunk
>> mistakenly uploaded from my normal account.  Conflation with existing
>> building data was manual, most of which data was authored by the same
>> user who asked for help with the import.  Conflation with existing
>> address nodes was done using the python scripts at
>> https://github.com/balrog-kun/osm-addr-tools.  There's one
>> municipality that is almost completely traced from imagery which I'm
>> not going to work on, possibly except buildings that are automatically
>> deterined to not intersect with any existing buildings.  There's data
>> for one more municipality that I'd like to import.  It contains 4000
>> closed shapes.
>> I have simplified the shapes (similarly to JOSM's simplify-way tool)
>> but I imagine the density of nodes may still worry some of you.  I
>> believe it is similar to the French cadastre.  You can look at some of
>> the data around http://www.openstreetmap.org/way/250886166.  Let me
>> know if you find any issues with the data.
>> Background and legal:
>> The fire service in various parts of Poland has much success talking
>> to local administration about providing data for use in OpenStreetMap.
>>  In the Strzelce-Drezdenko county user daroKPPSP from the local
>> brigade obtained building outlines data (in some cases footprints) for
>> the eight municipalities of that county, specifically for use in OSM.
>> A long time mapper and also a fire fighter SQ9NIT imported two of
>> these municipalities some time ago.
>> Cheers
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