[Talk-GB] Stratford imagery

Peter Miller peter.miller at itoworld.com
Wed Dec 9 21:20:57 GMT 2009

On 9 Dec 2009, at 18:39, Andy Allan wrote:

> On Tue, Nov 10, 2009 at 2:48 PM, Andy Allan <gravitystorm at gmail.com>  
> wrote:
>> Hi All,
>> Where did we end up with the Stratford imagery in the end? When I  
>> left
>> things, I'd made a layer containing about 7 images, made tiles from
>> them, and stuck them online.
> I guessed from the silence that nobody had any further plans. :-)
> Having some spare time on my hands right now (ahem!) I've grabbed as
> many warped images off of mapwarper and made a new tile layer, and
> I've added some more documentation to the wiki.
> http://wiki.openstreetmap.org/wiki/Stratford-upon-Avon/Imagery
> Anyone fancy collecting more imagery for any other towns?

Thanks Andy, your wiki page is very useful and it is also good to see  
the imagery in Potlatch. Is the location of image encoded in the image  
somehow, or how else does PotLatch know where to load it?

When I tried warping the images I did feel that the algorithm used by  
warper was possibly a bit suspect - the warping suddenly went  
completely wrong as one added more control points in a rather counter- 
intuitive way.

At present I feel that it was a great experiment, but that we either  
need much more vertical images which will be hard to achieve without a  
plane without specialist equipment or we need a smarter warper.  
Someone suggested at the time that it would be good to have a warper  
where one could lay down a way on the imagery and associate it with a  
way on the map - that could be hugely beneficial. Anyone fancy giving  
it a go?

We also need to compare the cost of our own imagery with the cost of  
purchasing satellite imagery and I feel that purchased imagery will  
often win (from $14 per sq km). The West Midlands guys are getting  
organised to host purchased photography for that area.



> Cheers,
> Andy
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