7 Cartographic Display and 

 Data Summaries 



Data used in the Sea Bright Pilot study were derived from several sources. 

 This included magnetometer and acoustic geophysical information collected from 

 survey boats in the field and hydrographic soundings provided by the National 

 Oceanic and Atmospheric Administration. Table 2 lists sources and projections of 

 the original navigation data provided with these data. For display in this report, 

 all data were converted to a uniform projection and coordinate system: New 

 Jersey Transverse Mercator, NAD27. Horizontal and vertical units of feet were 

 used to maintain compatibility with historical maps and with the units currently 

 used by USAE District, New York, project charts. Data display and projection 

 conversion were performed with Terramodel software (Version 8.33 for DOS- 

 based personal computers). 



Magnetometer data were processed using MATLAB software (Version 4.0 for 

 personal computers running Microsoft Windows). Magnetometer plots in 

 Appendix A were generated with MATLAB. 



Table 2 



Sources, Units, and Projections of Positioning Data 



Data Type 



Source 



Original Units 



Projection 



Hydrographic 

 soundings 



NOAA - National Geophysical Data 

 Center 



Latitude, longitude, depths 

 in ft below MLW 



NAD27 



Shoreline 



NOAA chart 12324 (June 1994) 



N.J. State Plane Grid - feet 



NAD27 



Sub-bottom profiler 



DGPS collected via X-STAR survey 

 system 



Latitude, longitude 



NAD27 



Magnetometer 



DGPS collected via SEAMAG system 

 (Sandia Laboratories) 



Latitude, longitude 



NAD27 



Fort Hancock battery 

 locations 



Magellan NAV 5000 hand-held DGPS 

 receiver 



Latitude, longitude 



NAD83 



Underwater video 



North Star 8O0X 



Latitude, longitude 



NAD83 



Chapter 7 Cartographic Display and Data Summaries 



49 



