[OpenMap Users] outlining an image, reprojecting onto map

We had major flooding in PA yesterday, as has much of the East Coast.
In this picture:

http://knauth.org/gsk/flood-040918/images/14.html

I want to mark some points on photos like the one above, draw some
outlines of flood limits, and then reproject the graphics onto maps. I
know the math exists, I just don't know how hard it is.

County officials are trying hard to understand the limits of
yesterday's event, to improve flood mitigation plans. I'm just looking
for ideas.

Geoffrey

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Geoffrey S. Knauth | http://knauth.org/gsk
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