[OSM-dev] history data

SteveC steve at asklater.com
Sun Apr 10 20:15:26 BST 2011


Maybe anything that touches I'd < 10 or something gets automatically banned and an email to the user?

Steve

stevecoast.com

On Apr 10, 2011, at 10:03, Tom Hughes <tom at compton.nu> wrote:

> On 10/04/11 17:47, Jochen Topf wrote:
> 
>> GET http://api.openstreetmap.org/api/0.6/node/1/history tells me this:
>> 
>> <osm version="0.6" generator="OpenStreetMap server">
>>     <node id="1" lat="2.0" lon="2.0" changeset="9257" user="τ12" uid="1298" visible="false" timestamp="2006-05-10T18:27:47Z" version="1"/>
>>     <node id="1" lat="50.1249473" lon="14.4557581" changeset="196013" user="tacut" uid="113502" visible="true" timestamp="2009-04-04T10:01:54Z" version="2">
>>         <tag k="name" v="Metro C - Kobylisy"/>
>>         <tag k="wheelchair" v="yes"/>
>>         <tag k="railway" v="subway_entrance"/>
>>     </node>
>>     <node id="1" lat="2.0" lon="2.0" changeset="524633" user="woodpeck" uid="5164" visible="true" timestamp="2009-04-14T15:42:57Z" version="3"/>
>>     <node id="1" lat="2.0" lon="2.0" changeset="1767082" user="Ldp" uid="48796" visible="false" timestamp="2009-07-07T22:44:41Z" version="4"/>
>> </osm>
>> 
>> How exactly am I to interpret this? Why are some visible="true" and some
>> visible="false"? The visible="false" on the last version tells me the node
>> is deleted. But what happened before? Does the visible="false" on the first
>> version mean it was deleted before it was re-created as version 2? For a
>> deleted node, does the timestamp refer to the creation or the deletion?
> 
> Here goes...
> 
> The real node 1 should be somewhere in the Regents Park area of London but it has a history of being accidentally changed by badly written imports and bots which just make up IDs starting at 1 and things.
> 
> It looks like in May 2006 it was deleted - it was already at a silly location so had probably already been the victim of a rogue client. We have no history before that online because history was wiped when we went to api 0.5 in October 2007.
> 
> It was then resurrected by somebody uploading a valid node 1 in April 2009 (just a few days before api 0.6 went live with version checks to make these accidental overwrites harder).
> 
> Frederik obviously noticed this and reverted that changeset, moving the object back to it's previous position again but not actually marking it as deleted. Eventually Lennard came around and deleted it again.
> 
> If you look at changeset 196013 you'll see it is just an upload of nodes 1 through 17 so a classic bad import. Those 17 nodes are then moved back again in Frederik's changeset.
> 
> Tom
> 
> -- 
> Tom Hughes (tom at compton.nu)
> http://compton.nu/
> 
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