Building the Salem Witchcraft GIS |
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Digitizing the Upham MapG. Identify Existing FeaturesThe first step in establishing control points was to identify features on Upham's Map that could be reliably located today. We needed as many points as we could readily get, and needed them as widely dispersed as possible. After review of the map and comparison with contemporary documents, we decided to use the following features as control points.
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