Hello, I am trying to estimate the area of irregular polygons drawn on graph paper with a known scale.
I currently have 50 sheets of graph paper (one each for my 50 sites) with hand drawn maps indicating different substrates, centered on a focal point. The side of each square in the graph is 5m. I would like to draw concentric circles around the focal point (15m, 30m, 45m etc) and estimate the area under each circle/annulus that falls within one polygon (substrate) or the other. Is there any simple graphing/blueprint software which can take scanned graph paper with a known scale and generate estimates of area? Could I possibly do this in Arcview 3.2 without importing any UTM data? Essentially, I would like to look at a map and say: The area of short grass within the 1st concentric circle (0-15m) is 400 m sq. and the rest is bare ground, etc. I understand that my alternate solution is to physically count graph squares within each polygon and estimate the number of partial squares, but I would like to be as accurate as possible. Further, making that same estimate repeatedly would generate a different area each time. Thanks for your suggestions, Aaftab Jain Contract Biologist. Albuquerque, NM. ****************** aaft...@hotmail.com *******************