Hot answers tagged digitizing
3
While I agree that there are much better tools to accomplish this task, I'll give it a go just for the sake of answering the question, as cumbersome as it may be. It is still going to take a good deal of manual effort, but at least you can knock out multiple doorways at once this way.
Basically, you can create point features wherever your doors are, ...
2
Something to keep in mind is that portolan chart navigation maps like Piri Reis don't a have coordinate system, rather they are several different local coordinate systems munged together -- each one of the rosettas or compass rose like symbols is a projection source of origin, loosely speaking.
So you can't just georeference the image in the usual GIS way ...
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