Page 161 - Green - Maritime Archaeology: A Technical Handbook. 2nd ed

140 Maritime Archaeology: A Technical Handbook, Second Edition
Input *.csv file LAYERS TPD dd1mm1yy1 FIX dd1mm1yy1
All transponders ON All fixes OFF
RUN
All transponders FIXED New date fixes ON All old date fixes OFF
All transponders ON All fixes OFF
New *.csv file LAYERS TPD dd2mm2yy2 FIX dd2mm2yy2
RUN
Rotate and translate coordinates
Report and graphic *.dxf file
Figure 4.24 Flowchart of HPASS operation.
poles, an abandoned 2-m grid frame was found lying on the seabed in passing, and without great attention to accuracy, HPASS was placed on each of the four corners of the grid. The resulting data have been plotted (see Figure 4.26) to demonstrate the short-range accuracy of the system.
The statistics give an interesting overview of the system. Site Surveyor provides data on the statistics of the system, particularly these data relat- ing to measurement residuals. Using Site Surveyor, the measurements were