[Talk-us] LA part of the map essentially is unusable

jeremy jozwik jerjoz.forums at gmail.com
Fri Jul 20 06:23:04 BST 2012


ACH is 65% re-built. im tired and getting annoyed at the 2000 point
limit. someone else take over...

sorry for the direct email to the recipient as well...

On Thu, Jul 19, 2012 at 6:40 PM, Charlotte Wolter <techlady at techlady.com> wrote:
>
>         Got it. Thanks for the explanation.
>         So, how do I "load shapefiles into a separate layer"? I need someone
> to walk me through it. How would I do that, if I wanted to get things like
> street names (and the other TIGER data)?
>
> --C
>
>
>
> At 04:11 PM 7/19/2012, you wrote:
>
> * Charlotte Wolter <techlady at techlady.com> [2012-07-19 15:58 -0700]:
>>         That's great, but will it overwrite work that we've already
>>         done?
>
> Presumably not.  Potlatch loads shapefiles into a separate layer and
> requires mappers to manually pull the data into OSM.
>
>>         Also, is this something that works only in JOSM, in which
>> case many of us couldn't use it?
>
> No.  For one thing, Richard is the main developer of Potlatch and doesn't
> do anything with JOSM.  For another thing, he mentioned "reworking the P2
> source code"; "P2" refers to Potlatch 2.
>
>>         Also, I still don't understand why all the TIGER data was
>> deleted on ways that were partially deleted.
>
> Because of OpenStreetMap's data model.  When you split a way, what your
> editor does is upload a changed version of the original that only
> contains half the original nodes and then upload a new way with the same
> tags as the old one that contains the other half of the nodes.  To
> subsequent database queries, the second way appears as though you created
> it and there's no direct link back to the way that originally contained
> the nodes.
>
> On top of that, there was a deliberate decision made (as I understand
> things) not to undo deletions, which includes the removal of nodes from a
> way.  Had the bot done that, there would be many places where the bot
> would create multiple, overlapping, tangled ways.
>
> Since either approach would have left significant messes for mappers to
> clean up, there wasn't really a good way forward.  The people working on
> the redaction bot felt that not undeleting would be the better of two bad
> options.
>
> --
> ...computer contrarian of the first order... / http://aperiodic.net/phil/
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> Charlotte Wolter
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