It is a manual, judgement based process. I am fortunate to have 1937
aerial photos taken for the Agriculture Dep't. for the area in VA that I am
plotting. If you can find something similar, it is a great tool because many of
the old property lines still exist. Another point is the terrain description
like "on a ridge", "near a stream", etc. Here an old USGS map is a
to use. Older images are usually best because the terrain features are more
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