Table B1 



Data Sources and Conversions 



Data Type 



Source 



Original Coordinate 

 System and Units 



Terramodel Conversion 



Shoreline 



NOAA medium-resolution digital vector 

 shoreline - mhw or mhhw line as shown on 

 NOAA hydrographic charts. 



Latitude longitude 

 NAD 83. 



COORDCON conversion from 

 LL83 to NY-LI. 



1933 

 bathymetry 



NOAA hydrographic survey data from 

 National Geophysical Data Center (provided 

 in digital form). 



Latitude longitude 

 NAD 27; depths in m 

 below mlw. 



COORDCON conversion from 

 LL27 to NY-LI; FACTZ multiply 

 depths by 3.281 ; FACTZ add 

 -1 .66 ft to convert to NGVD 

 (see Appendix E). 



1949 

 bathymetry 



U.S. Army Corps of Engineers (USACE) 

 hydrographic and profile data, digitized from 

 paper charts by Moffatt & Nichol Engineers. 



Unknown. Supplied to 

 U.S. Army Engineer 

 Waterways Experiment 

 Station (WES) in 

 digitized form: State 

 Plane, NAD27; depths in 

 ft below NGVD. 



COORDCON conversion from 

 NY-LI 83 to NY-LI 27. 



June 21, 1994 

 bathymetry 



SHOALS LIDAR bathymetry survey from 

 CERC archives. Includes inlet area and 

 ocean coast between Moriches and 

 Shinnecock Inlets. 



Latitude longitude WGS 

 84; depths in m below 

 mllw. 



COORDCON conversion from 

 LL84 to NY-LI; FACTZ multiply 

 depths by 3.281 . Total number 

 of points reduced from 

 -160,000 to -40,000 using 

 FORTRAN program on VAX 

 computer. 



August - 



September 



1996 



SHOALS LIDAR bathymetry survey from 

 John Chance & Associates. Includes inlet 

 area and ocean coast off Westhampton 

 Beach. 



Latitude longitude WGS 

 84; depths in m below 

 NGVD. 



COORDCON conversion from 

 LL84 to NY-LI; FACTZ multiply 

 depths by 3.281 . Total number 

 of points reduced from 

 -492,000 to -123,000 using 

 FORTRAN program on VAX 

 computer. 



B2 



Appendix B Cartographic Data Analysis 



