[OSM-talk] OSMXapi

[Daniel Taylor]

Chris Hill wrote:
> I have extracted some data yesterday from OsmXapi for a range [bbox=-1.1,53.63,0.16,54.17], roughly the area of East Yorkshire, UK.
> 
> In the resulting data there are nodes and ways from well outside this area, for example:
> 
> <node id='46201367' lat='52.3305' lon='5.06701' user='Ed Kapitein' osmxapi:users='Ed Kapitein' timestamp='2008-02-22T16:55:00Z'>
>     <tag k='AND_nodes' v='236712'/>
>     <tag k='AND_nosr_p' v='10012917'/>
>     <tag k='is_in' v='NL'/>
>     <tag k='name' v='Muiden'/>
>     <tag k='place' v='village'/>
>     <tag k='population' v='1000'/>
>     <tag k='postal_code' v='1398'/>
>     <tag k='source' v='AND'/>
>   </node>
>  
> Is this normal?
> 
> 
> cheers, Chris
> 
> 
> 
> 
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Hi,

I had this problem the other day extracting data from the Wigan area, 
when I looked at what was being downloaded it was data that was 
connected/related to data that was inside the bbox I had selected. For 
example a large primary road (one _long_ way) was included even though 
the majority of it clearly outside of the bbox I had selected, from what 
I have read this happens by design.

http://wiki.openstreetmap.org/index.php/OSM_Protocol_Version_0.5#About_bounding_boxes

"The following command returns:

     * All nodes that are inside a given bounding box and any relations 
that reference them.
     * All ways that reference at least one node that is inside a given 
bounding box, any relations that reference them [the ways], and any 
nodes outside the bounding box that the ways may reference. "

That might be the cause of your issues, and if so there doesn't seem to 
be a way around it.

If you find one let me know!

- Daniel