Re: [OSM-dev] How reconstrucing a way from the history?

[Richard Fairhurst]

Thomas Wood wrote:
 [updating way when node moved]
 However, I think potlatch does work in this way..

It does in 0.5 but won't in 0.6.

This does make it a bit more difficult in 0.6 for Potlatch's way revert tool
('H') to figure out what the revision dates were, which is what I'm working
on at the moment.

cheers
Richard
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Re: [OSM-dev] How reconstrucing a way from the history?

[Robert Vollmert]

On Jan 12, 2009, at 13:45, Nevel Gandish wrote:
 And can I be sure that when moving a node caused a new history entry
 for the node and the way that both have the exact timestamp or might
 they differ by a few seconds?

Just moving a node doesn't create a new history entry for the way, I  
think.

Cheers
Robert


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Re: [OSM-dev] How reconstrucing a way from the history?

[Nevel Gandish]

2009/1/13 Robert Vollmert rvollmert-li...@gmx.net:
 On Jan 12, 2009, at 13:45, Nevel Gandish wrote:

 And can I be sure that when moving a node caused a new history entry
 for the node and the way that both have the exact timestamp or might
 they differ by a few seconds?

 Just moving a node doesn't create a new history entry for the way, I think.

Um, that seems true indeed. I just assumed it would.

Nevel

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Re: [OSM-dev] How reconstrucing a way from the history?

[Thomas Wood]

2009/1/13 Nevel Gandish koanti...@googlemail.com:
 2009/1/13 Robert Vollmert rvollmert-li...@gmx.net:
 On Jan 12, 2009, at 13:45, Nevel Gandish wrote:

 And can I be sure that when moving a node caused a new history entry
 for the node and the way that both have the exact timestamp or might
 they differ by a few seconds?

 Just moving a node doesn't create a new history entry for the way, I think.

 Um, that seems true indeed. I just assumed it would.

 Nevel


However, I think potlatch does work in this way..

-- 
Regards,
Thomas Wood
(Edgemaster)

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Re: [OSM-dev] How reconstrucing a way from the history?

[Frederik Ramm]

Hi,

Nevel Gandish wrote:
 I currently try to reconstruct ways from the history. Retrieving the
 ways is no problem. Retrieving nodes from the history isn't too.
 But how to put them together? Not every node has a entry for every
 entry in a ways history.
 Is figuring out by comparing the timestamps the right method or is
 there a better one?

I would suggest you download an old planet file that contained the 
right data and extract the data from there; this gives you a 
(relatively) consistent set of ways and matching nodes, and causes less 
strain on the API.

You cannot rely on ways and nodes having identical timestamps.

Bye
Frederik

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