[Talk-GB] JOSM Imagery

[Michael Collinson]

On 30/10/2012 22:33, Dudley Ibbett wrote:
> Hi
>
> My version of JOSM seems to have just updated on my Fedora system and 
> I now have NLS OS 1:25k 1st Series 1937-61 imagery.
>
> I am probably behind the times but presumably this can be used for 
> mapping.  If someone could confirm its use this would be appreciated.  
> I appreciate its accuracy will need to be considered along with all 
> the other data sources.

Yes.  In the UK, "Crown copyright", under which OS maps are published, 
extends for 50 years. So as long as there are no maps beyond 1961, using 
them is fine.

>
> If it can be used it will be very helpful as it has field boundaries 
> as well as public rights of way.  There are a number of other imagery 
> data sources that have also been added but not all seem to display.

I certainly use them for both in the slow-changing Yorkshire Dales and 
they are also a great source of rural names.  Note two things: Alignment 
is OK but not brilliant, due to paper stretch and the survey techniques 
used at the time, you will constantly have to re-align to GPS traces 
every couple of kilometres or less.  And secondly the paths are just 
paths and do not signify any public right-of-way.  I usually map them, 
(diligently using the source tag as well as access=unknown), and then go 
out and see if they are there.  A surprisingly large proportion simply 
no longer exist in any form and need to be removed.

Good luck!
Mike
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