Process Description:
All references that discussed the physiographic provinces of New Jersey were reviewed to determine why the various authors placed the boundaries where they did. After extensive review and based on the formal definition of a physiographic province it was decided to mainly follow the work of Rollin D. Salisbury. There are some areas where the geologic contact was exclusively followed for convenience rather than topography. These include the Furnace Brook- Pequest Valley and the Franklin area as well as Peapack- Gladstone area. Once it was determined what would define the boundaries for the various provinces it became a simple geographic information system exercise to create the data set. The maps were scanned using a CalComp ScanPlus II roll-feed, E-format, two-camera scanner at 400 dots per inch. The scanned image accuracy is reported at +/-.25 percent. A CalComp 9500 digitizer with an accuracy of +/- 0.005 in. (+/-0.127 mm) was used for editing the data. All features were vectorized or digitized as board-inches. Proof-plots were generated and overlaid onto the original Miscellaneous Investigations and Open-File maps. Tics were digitized into the coverages using the 7.5 mjnute graticule on the base map. The coverages were then transformed into NAD83 state plane coordinates utilizing the New Jersey Department of Environmental Protection STATCO coverage. Four tics on each mylar were utilized to register the data for digitizing (editing). A root-mean-square (RMS) error of 0.005 was required (approximately 41.67 feet at 1:100,000 scale). Proof plots were made for each data set on mylar and compared to the original data. Linework that deviated from the original position by more than 0.02 inch were re-digitized, re-plotted, and corrected until acceptable results were obtained