[Imports] [Import] Infrastructures and Village boundaries of Surabaya City (Indonesia- East Java region)

Dewi Sulistioningrum dewi.sulistioningrum at hotosm.org
Tue Sep 27 03:32:05 UTC 2016

Thanks Kevin for your experience about the import data in New York.
In the PDC project, after I upload the infrastructures data. The data will
be updated and correction with field survey in Surabaya. Because the import
data have only a little information like amenity and no mention name. We
will do field survey with collecting other attribute data.


On Tue, Sep 27, 2016 at 1:13 AM, Kevin Kenny <kevin.b.kenny+osm at gmail.com>

> Wow, for once Frederik and I agree on something having to do with an
> import!
> (I'm teasing, of course.)
> Even better than "remove the object from the import list so you don't
> create a duplicate" is "conflate the objects so that you get the best
> information from both sources." But we all knew that:  conflation >
> avoidance > duplication.
> Conflation is more work, though, and usually needs at least consultation
> with the local mapper. That's what I did on a recent project to make sure
> that the State Parks in New York were all there - using the laborious
> process of reconstructing their boundaries from the tax rolls. If I saw a
> substantial difference in the park boundary between what the tax rolls
> showed and what was in OSM, I got in touch with the mapper who put the park
> boundary there in the first place. In every single case, the response from
> the local mapper was that they were tracing differences in landcover from
> orthophotos, and they welcomed boundaries from a more authoritative source.
> All the rest of the data (that is to say, the tagging) - the local mapper's
> information would win out over the "official" information unless I could
> verify personally that the "official" version was correct. (For well over
> half the state parks, nobody had mapped them yet..)  I didn't call this one
> an 'import' because all edits were applied manually, using carefully
> selected data from the tax parcels and a lot of manual patchwork to make
> the boundaries coherent.
> It's fairly safe to automate conflation only if you can prove (generally
> through an object's version history) that the object you're destroying was
> the result of an earlier import, and you have a reasonably comprehensive
> understanding of how the earlier import was done. I did a lot of that with
> the reimport of the "New York DEC Lands" file - replacing old information
> with new, and in some cases then reapplying changes that the locals had
> made.
> Now, having done a couple, I'll concur with Frederik that imports are
> insanely difficult to get right, generally an order of magnitude more work
> than the proponent expects.
> On Mon, Sep 26, 2016 at 12:18 PM, Frederik Ramm <frederik at remote.org>
> wrote:
>> Dewi,
>> On 09/26/2016 07:26 AM, Dewi Sulistioningrum wrote:
>> > The source data and permission letter for data license from government
>> > disaster in East Java.
>> I can't see the permission letter?
>> I have looked at the infrastructure import web page and I think you
>> should perhaps add a sentence like "if you find that there is already a
>> node or building mapped in OSM, remove that object from the import list
>> so you don't create a duplicate" or so.
>> Best
>> Frederik
>> --
>> Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"
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Dewi Sulistioningrum
dewi.sulistioningrum at hotosm.org

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