Process Description:
Stable-base manuscripts were manually digitized by U.S.G.S.. Adobe Illustrator layers of the section lines and registration marks were exported as ESRI shapefiles (in board-inches) using Avenza's MaPublisher software. The registration marks correspond to known coordinates on the base maps (NAD83, New Jersey state plane coordinate feet). The shapefiles were converted to Arc/Info coverages. An empty coverage was generated by manually inputting the known coordinates as the registration marks (tics). Each tic was also assign a unique identification number. The coverage with the section lines and registration marks was then edited. The tics automatically created for this coverage were moved so they exactly overlayed the registration marks. The tics were assigned the same unique identification numbers as in the empty coverage. The section lines and registration marks coverage was then transformed into the empty coverage. The section lines and registration marks are now in NAD83, New Jersey state plane coordinate feet. The transformation had an RMS error of 0.005. The coverages were checked against the original maps. The coverages were joined together and converted to ESRI's shapefile format.