[OSM-dev] database history

[John McKerrell]

On 6 Jan 2009, at 04:15, Martin Koppenhoefer wrote:

>
>
> 2009/1/6 D Tucny <d at tucny.com>
> 2009/1/6 Martin Koppenhoefer <dieterdreist at gmail.com>
> I was looking on the history of this way:
>
> http://www.openstreetmap.org/api/0.5/way/23322317/history
>
> and found, that the first 3 are completely the same (beside that the  
> first entry and No. 2 and 3 have a different created by-tag), or am  
> I missing something? Is this a case that can be found more often?
>
> If you have a look at the nodes in the way, some of them changed  
> position... If I recall correctly, potlatch, the online editor save  
> a new version of the way, and potentially all nodes within it, if  
> any part of the way is modified... In this case, only changes to  
> node positions occurred between the second and third versions being  
> saved...
> Specifically, this node http://www.openstreetmap.org/api/0.5/node/252528351/history
>
> d
>
>
> ah, now I understand. Is this behaviour still in the actual  
> versions? It creates lots of history-data for ways that didn't  
> change (just for moving 1 node the whole way is resaved, which  
> itself doesn't even differ, imagine this for a big way with some  
> hundred nodes).


I was thinking the other day that it might be nice to update the  
history page on the site [1] so that it gives more information about  
changes that occured, i.e. colouring new tags green, showing deleted  
tags crossed out, that sort of thing. I might have a go at doing that  
sometime unless someone else was planning on it. What do people think  
about this idea?

John

1 - http://www.openstreetmap.org/browse/way/23322317/history
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