Georeferencing in R
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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