Process Description:
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 and inputting the dikes 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. AUTHORS NOTES: Enlargement of the data to more detailed scales than specified could result in registration errors. If information is needed at more detailed scales, please contact the New Jersey Geological Survey to determine the status of detailed mapping.