[josm-dev] downloading data along a gpx track

[Shaun McDonald]

On 11 Jul 2008, at 21:13, Petr Nejedly wrote:

> mariner napsal(a):
>> Hi there,
>>
>> There is one feature I am really missing in JOSM. It's the ability to
>> donwload the data of OSM near a gpx track.
>>
>> I would like to place a feature request here on the list.
>>
>> It would be great to get only the data from JOSM, which is really
>> important. This is mostly beside a track. Maybe 100 meters on each  
>> side
>> around the logpoints. Would something like this be possible? I would
>> like to help, but have no idea where to start...
>
> You'd have to tile your cover area with rectangles and then ask the
> server for each such a rectangle separately (as the OSM API only  
> supports
> asking for one rectangle at a time) and merge the resultant datasets.
> It might end up being much faster to actually download the big  
> rectangle
> over all your GPX data (unless you cross the server request limit,  
> of course).
>

For my 8-9 mile cycle journey to/from work every day, I have to  
download the data in lot of little bounding boxes, otherwise I hit the  
50,000 node limit. This feature would be really useful, as it would  
save me having to download manually each of the bounding boxes. (Or  
maybe the incomplete London already has too much data.)

Shaun

> Now, depending on your motivation, it might be enough to take that big
> rectangle and filter it locally.
>
> If your concern is JOSM responsiveness/memory consumption, local  
> filtering
> might work well.
>
> If your concern is the server limit, cutting the coverage into pieces
> digestible to the server is the only way. It would be useful
> addition anyway, as it could support other use cases too.
>
> -- 
> Petr "Nenik" Nejedly, NetBeans/Sun Microsystems, http://www.netbeans.org
> 355/113 -- Not the famous irrational number PI, but an incredible  
> simulation!
>
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