[Imports] Imports Digest, Vol 63, Issue 25

[Andrew Buck]

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Yeah, the method of including the various admin level distric pcodes
in the settlement pcode was discussed by the group when they were
generating them, but they decided against it for exactly the reason
you stated, boundaries change over time.

Regarding the merge itself, it does seem like the script method would
be more robust for sure.  Just to avoid duplicating any previous work,
do you (or anyone else) know of such a script?  Our plan was basically
going to be to write one from scratch but if such a thing already
exists (or something close) it makes a lot more sense to use that.

- -AndrewBuck

On 09/24/2014 03:09 PM, Severin Menard wrote:
> Hi Andrew,
> 
> I agree taht pairing the OSM Ids will be the most simple and
> robust solution. Regarding the Pcodes methodology, seems an old
> method (that was used eg in Haiti) has been abandonned (or you did
> not mention it), whas is really fortunate: concatenate admin level
> IDs (every admin level having an integer number between 1 and x).
> Seems practical at first glance, but a real nightmare as admin
> boundaries can change. Basically this system created unique IDs but
> not for unique objects. And in Haiti, where admin level had been
> reorganized by the government a few years before the Earthquake,
> GIS people were more fighting against the pcodes than able to use
> them.
> 
> Sincerely,
> 
> Severin

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