[Talk-GB] Question regarding mapping inaccuracies.

Shaun McDonald shaun at shaunmcdonald.me.uk
Sun May 31 15:32:37 BST 2009


On 31 May 2009, at 15:11, Andrew M. Bishop wrote:

> Shaun McDonald <shaun at shaunmcdonald.me.uk> writes:
>
>> On 29 May 2009, at 20:23, Peter Miller wrote:
>>
>>> On 29 May 2009, at 15:42, Shaun McDonald wrote:
>>>
>>>> I'm wondering if someone will be able to implement an efficient
>>>> version of the snooker ball visualisation on http://www.cyclestreets.net/blog/2009/03/26/thats-a-really-odd-route/
>>>
>>> That's very useful. Is it possible for anyone to view that mapping
>>> view through Cycle Streets?
>>
>> No due to reasons of poor performance, hence why I'm asking is  
>> someone
>> else would be interested in implementing something similar with far
>> better performance and global coverage. The original authors would be
>> really happy to see it implemented elsewhere, as it would bring great
>> benefits to the OSM data.
>
> As a quick hack I have generated such a map for the UK.
>
> http://www.gedanken.org.uk/mapping/osm-junctions/junctions.html
>
> The junction data comes from Routino[1] and as such not all highway
> junctions are included (only highways that are routable).  The
> rendering is performed client-side so is rather slow (probably my
> Javascript isn't optimum).  The server will only allow downloading a
> limited amount of data at a time so I recommend you zoom in to the
> highest or penultimate zoom level.
>

Nice start.

I'd like to be able to zoom in more, particularly in central London.  
I've also found that clicking "Get Junctions" often gets an area,  
where only a little bit is visible at the highest zoom, and you have  
to pan and re-request to get for the current area. I'd also like a  
permalink, and a link to the osm site for easy editing.

Shaun
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