[Imports] Address and house number import Germany/Land Sachsen Anhalt

[Jack Jost]

Hello all,

I aim to import addresses and missing house footprints from German LoD1
cadastre data. LoD1 model data is provided by German cadastre office here:
https://www.lvermgeo.sachsen-anhalt.de/de/kostenfreie_geobasisdaten_lvermgeo.html.
License/permission grant (and requirements for attribution in source-tag of
changeset) is recorded here:
https://wiki.openstreetmap.org/wiki/DE:Permissions/Geobasisdaten_Sachsen-Anhalt
.

A jupyter notebook to compute addresses, house numbers, and footprints from
LoD1, and to prepare changeset files for upload is maintained here:
https://codeberg.org/j0j/OSM/. All buildings are annotated with tags for
elevation, height, building type and function derived from ALKIS code, and
city, streetname and housenumber if the building has a house number.

To ensure a careful and diligent procedure, a staged import is planned:

(1) Import buildings with street and house number address that are not in
OSM yet, and do not conflict with existing geometries in OSM.
(2) Import buildings without house numbers that do not conflict with
existing geometries in OSM.
(3) Update existing houses that match geometries on a metric such as 90%
overlap as measured by intersection-over-union (Jaccard index).
(4) Reconcile conflicting buildings manually and/or publish a list of
buildings that are not suitable for automatic reconciliation.


In particular, all imports shall maintain the same source tag
("source=GeoBasis-DE / LVermGeo LSA, dl-de/by-2-0, LoD1"), and buildings
will identify source dataset and dataset date by tag
"source:geometry=GeoBasis-DE / LVermGeo LSA, dl-de/by-2-0,
LoD1_608_5758_2_ST:DESTLIKA0004H3EV (2019-12-09)", so that imported
buildings can be easily identified and reviewed.

The following exemplary screenshot from the notebook compares OSM buildings
(red, left) with new buildings (blue, right).

[image: image.png]

An interactive rendering of the notebook to explore differences between
current OSM and generated changesets is accessible here:
https://j0j.codeberg.page/.
Please let me know if you have any questions or concerns that should get
addressed before starting this import.
Kind regards,
-Jack
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