OpenStreetMap

Elevations mass editing

Posted by Cascafico on 13 March 2018 in Italian (Italiano)

Update: comments pointed out that such edits are against the code of conduct, even if not automated. I leave this post just as personal hint on queries and regexp's.


It happens there's a lot of OSM tags "ele"=" m" that can't be processed by useful queries like find volcanoes between 1000 and 2500 meters high

How I remove unit of measure:

  • download faulty data with this generic overpass-turbo query
  • from export menu, "download/copy as raw OSM data"

  • load resulting .osm file in Notepad++ (or whatever regexp editor)

  • find&replace (CTRL+h) twice with the following fields:
    find: k="ele" v="(\d+(.\d+)) m" will find for example "450.5 m"
    replace: k="ele" v="$1" will replace "450.5"
    find: k="ele" v="(\d+) m" will find for example "450 m"
    replace: k="ele" v="$1" will replace "450"

  • load in JOSM modified .osm file

  • select all (CTRL+a) and add a fake tag (ie: pippo=pluto) to every node and remove it (just a shortcut to add "modify" tag to elements, otherwise you won't be able to upload anything

Remember to add proper changeset comment.

Comment from mmd on 13 March 2018 at 17:39

It’s really not necessary to remove the trailing „m“ in Osm data for overpass turbo to work. Instead you should convert the relevant ele tags to a number. Roland wrote a blog post about this topic which explains all the details!

http://dev.overpass-api.de/blog/numbers.html

Comment from Cascafico on 13 March 2018 at 19:31

Thanks a lot! I will read carefully those queries (I didn't know there were a blog about overpass-turbo).

Comment from FeRDNYC on 14 March 2018 at 08:08

And it seems that when someone tried to mass-edit elevations to remove " m" suffixes last year, those edits were reverted with a link to the Automated Edits code of conduct.

See e.g. the history for the elevation example in that blog post, the Sickersberg.

Comment from Cascafico on 14 March 2018 at 09:45

Thanks for this info! Actually I didn't think my mass edits falled in "automated" category mentioned by the code of conduct you quoted.

I hope somebody will document the precious overpass.turbo syntax that "overpass" :-) mixed value notations.

Comment from mmd on 14 March 2018 at 12:53

Actually I didn't think my mass edits falled in "automated" category mentioned by the code of conduct you quoted.

If you take a look at the scope of said Automated Edits code of conduct, you'll notice that your blog post exactly matches point 4 in the scope section:

"use of find-and-replace functionality using a standard editor such as JOSM or finding using services such as Overpass API and changing without reviewing cases individually"

Comment from Cascafico on 16 March 2018 at 10:14

If you take a look at the scope of said Automated Edits code of conduct, you'll notice that your blog post exactly matches point 4 in the scope section

Yes, after your hint I red the whole article; what I ment is that title "Automated edits code of conduct" was misleading. I had a different idea of "automated".

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