Before revision: This rather advanced analog technology is being taken over by simple Image Measurement software tools like, ImageJ, Adobe Acrobat, Google Pro Earth , Gimp, Photoshop and KLONK Image Measurement which can help do this kind of work from digitalized images.
After revision: This rather advanced analog technology is being taken over by simple image measurement software tools like, ImageJ, Adobe Acrobat, Google Earth Pro , Gimp, Photoshop and KLONK Image Measurement which can help do this kind of work from digitalized images.