Hi all

I started to replace occurrences of addr:interpolation=* in Switzerland with single addresses from GWR using the de-facto standard (Karlsruhe Schema), i.e. with addr:street=* and addr:housenumber=*.

Address interpolations are described at https://wiki.openstreetmap.org/wiki/Addresses#Using_interpolation . They are easily created but have several disadvantages:

- They are inaccurate when addresses are distributed irregularly - They need extra effort for parsing compared to addresses using the Karlsruhe Schema - A surprisingly large number of interpolations is incorrectly tagged: Closed ways, missing house numbers, interpolation types (e.g. "odd") not matching to house number (e.g. "16"), etc.

For these reasons I believe it would be best to remove all those interpolations in Switzerland.

Here is a possible workflow using JOSM:

- Choose an interpolation line using an Overpass query: https://osm.li/BdF - Click one of the ways, open its link, e.g. https://www.openstreetmap.org/way/155022798 - Use the "Edit" button to download the area surrounding the interpolation line in JOSM - Determine the name of the municipality, look up its Wikipedia article, determine its BFS number - Load the corresponding GWR data set from https://qa.poole.ch/addresses/GWR/ into a new layer (.osm format works well) - Copy all addresses that were interpolated from GWR into the JOSM data layer - Delete the interpolation line, possibly also the address nodes at the end - Upload - Repeat

I have two questions regarding this:

1. Does anybody oppose the systematic (but still manual) replacement of interpolation lines by the addresses from GWR? 2. Is anybody willing to support me by replacing some addresses on his/her own? There are currently 97 interpolation lines left.

Best regards

Lukas