I have a variety of data sources I'm trying to use together for the
purpose of understanding a neighborhood, including 400dpi 100 foot per
inch topographic maps, 1938 vintage aerial photos, modern aerial photos,
and a plant map updated to 1983. Only the modern aerial photos are
georeferenced.
The vintage aerial photos are known to have distortion, so simple
rubbersheeting is out:
http://gisconference.cas.psu.edu/2005/proceedings/1_tues_1130.pdf
Of course, that piece of software is rather costly for a hobbyist. I
assume the answer for me is GRASS (I have a Mac, anyway, so....)
The question is what else do I want? My goal is to georeference all the
pieces, and then be able to do overlays. Worse, there's a little
distortion in the scanning of the maps
(http://images.library.pitt.edu/g/geotopo/) so I need to figure out how to
stretch them slightly and rotate to get a clean join if I want to mosaic
them, and Photoshop is being... less than helpful. I can crop down to the
neatline, but the result is neither square nor exactly the right dimension
to match its neighbor.
Is there anything I want instead of GRASS, and regardless do I want
something other than Photoshop (and if so, what?)
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