For those of you wanting more info on the "plane table" SH is talking about - here is a link that explains it fairly well.
http://www.google.com/url?sa=t&sour...hcCDBw&usg=AFQjCNH1s2gpJ62zWXLj2swxA2WR_DETGw
Jerry
http://www.google.com/url?sa=t&sour...hcCDBw&usg=AFQjCNH1s2gpJ62zWXLj2swxA2WR_DETGw
Jerry