[Talk-GB] A new Flickr group for old out-of-copyright OS Maps

Peter Miller peter.miller at itoworld.com
Sun Sep 13 22:49:15 BST 2009


On 13 Sep 2009, at 22:41, Thomas Wood wrote:

> These maps are already rectified of course, it's usually good to
> convert the OS coordinates to Lat/Lons and then set the grid corners
> as reference points.

But my photographs of the maps will have introduced some tilt and  
other distortions, so it does need some control points. Possibly you  
are saying that I can calculate the control points from the OS grid  
references for the corners. That may indeed be true.

> Quite a few sheets were done this way for Oxford. See
> http://warper.geothings.net/layers/7 for an example of what's
> possible.

Very nice.


Regards,


Peter



>
>
> 2009/9/13 Peter Miller <peter.miller at itoworld.com>:
>>
>> I was lent 65 first-edition 1:500 OS maps of Ipswich dating back to
>> 1882 a couple of days ago which I have now photographed and uploaded
>> to Flickr. I was surprised to find that there was no Flickr group of
>> out-of-copyright OS maps so I created it.
>>
>> The rules I have created says that all maps should be geo-coded, that
>> the photos should be released CCBYSA and that the contributor agrees
>> that the images can also be used to derive mapping for OSM (to cover
>> use under ODBL where there derivation from CCBYSA is less certain.
>>
>> The group is here:
>> http://www.flickr.com/groups/1192119@N24/pool/
>>
>> I have also just rectified one map using Warper. Four control points
>> seemed to do the job very well.
>> http://warper.geothings.net/maps/preview/1205
>>
>> If anyone has any suggestions about adjusting the rules for the group
>> or wants to be an admin then please let me know.
>>
>>
>>
>> Regards,
>>
>>
>>
>> Peter
>>
>>
>>
>>
>> _______________________________________________
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>> Talk-GB at openstreetmap.org
>> http://lists.openstreetmap.org/listinfo/talk-gb
>>
>
>
>
> -- 
> Regards,
> Thomas Wood
> (Edgemaster)





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