I'm interested in digitizing some scanned time series, and looking for a solution that is easy and flexible. I thought I might be able to use R's locator() if I could get the image into a device. I noticed that there are some packages like (rimage), but it (a) doesn't seem to be available for the Windows version and forces me to upgrade a bunch of libraries for my linux system. It seems like someone should have something for digitizing maps and/or there something very obvious that I am missing here. Any suggestions would be appreciated!
I have used "xfig" with some success. You suck your image into xfig and give it a large depth. Next you draw contours and scales over the top of the image. The xfig coordinates can be converted to appropriate coordinates with a linear transformation. I have done a number of coastlines and topographic maps this way.
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