[OSM-dev] Get geometries out of OSM changes file

[Darafei "Komяpa" Praliaskouski]

https://wiki.openstreetmap.org/wiki/Overpass_API/Augmented_Diffs

нд, 21 сак 2021, 20:01 карыстальнік François Lacombe <
fl.infosreseaux at gmail.com> напісаў:

> Hi all
>
> For the needs of ProjetDuMois statistics computing chain, I'm looking for
> an appropriate logic to get geometries associated with osm changes in an
> osc file, particularly for past versions.
>
> According to this discussion, it sounds to not be easy.
>
> https://help.openstreetmap.org/questions/58931/osc-to-osm-change-file-to-osm-osmium/58948
>
> Currently, we convert an OSC file to CSV without any geometry information
>
> https://github.com/vdct/ProjetDuMois/blob/master/db/10_project_update.js#L275
> with following xslt sheet
> https://github.com/vdct/ProjetDuMois/blob/master/db/osc2csv.xslt
>
> We now aim to group and count changes against some administrative
> boundaries. As a given feature can change of admin area between two
> versions, we must filter the changes we're interested in, intersect each of
> them with selected admin boundaries and finally count how may they are in
> each admin boundary.
>
> Despite I'll be able to get lat/lon for nodes, rebuild linestrings for
> ways will be tricky as we'll have to not only check against nodes ids but
> timestamps as well.
>
> It's not a problem to do that each day with daily updates but issues
> occurs when we drop the database and try to get back 2 or 3 month with no
> geometry history at all.
> See this chart (in French) :
> https://github.com/vdct/ProjetDuMois/issues/188#issuecomment-802221915
>
> I'll be happy to discuss about such process here as I think someone may
> already had to solve it.
> Thanks in advance, all the best
>
> François
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>
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