[R-sig-Geo] Georeferencing in R

[Juta Kawalerowicz]

On 25/01/2012 16:17, Barry Rowlingson wrote:
> On Wed, Jan 25, 2012 at 3:25 PM, Ben Weinstein
> <benweinstein2010 at gmail.com>  wrote:
>> Hello all, posting a question for a friend.
>>
>> Has anyone had any experience georeferencing historical museum data using R
>> packages? I'd also be interested in any up to date solutions outside of R,
>> but it would be easily to integrate all analysis into one script.


Hey,

I know of another outside R solutions which is used for digitalising 
maps - it's called Arc Explorer. You can download it free of charge from 
Esri website. Sorry, this is not an R solution, but hopefully will lead 
you to a possible way to approach this problem.  The procedure is the 
same as described by Barry, you scan a map and then mark points (at 
least 3) for which geographic coords are known.

I may have some old tutorial notes, so if you want a copy let me know.

Juta


>   What sort of georeferencing do you mean? Imagery? Or getting coords
> from text (placenames etc)?
>
>   I'd use Quantum GIS for georeferencing imagery - the georeferencing
> plugin there lets you load in an image, click points on the image and
> either enter coordinates or click the corresponding point on a visible
> map. Then click the 'go' button and it works out the transform to
> overlay your image on the map correctly.
>
>    For text referencing you might be able to use my "geonames" R
> package to search location info from the www.geonames.org database.
>
> Barry
>
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