2019-12-16 GC Agenda - Item 5 - Attachment 1 - Noosa Spit Shoreline Erosion Management Plan-Part 2

Further processing of the data was done in the QPS Qimera and Chesapeake SonarWiz
software packages. Qimera was used to correct, clean, and reduce the bathymetry data to the
AUSGEOID09 datum, whereas SonarWiz was used to geospatially correct and image
enhance the sidescan sonar data into mosaics.




                          Figure 6: Qimera post-processing software.



All data were combined in Fledermaus to better assess the relationship between the
bathymetry and backscatter data, and to QC the results from all survey areas.



2.5 Land Transects and Single Beam Echosounder
Ground elevations over the sandbank and beach profiles were acquired using a Leica GNSS
GG04 Smart Antenna interfaced to a handheld computer operating Zeno Mobile software for
data collection. Real time corrections were received from HxGN Smartnet via a mobile link.
The antenna was mounted at a fixed height on a backpack unit with data acquired every
second whilst walking over the mapping areas. 
Ground elevations over the very shallow water areas were captured from a shallow draft
dingy fitted with a 200kHz Ceeducer Ceescope single beam echo sounder (SBES) operating
at 6 pings per second. SBES data were acquired with Chesapeake Technology SonarWiz
software along with positioning and time stamp information 6 times per second. Vertical
accuracy of the single beam transducer at 8 degree beam width is 0.02% of depth or 1cm,
whichever is greater. The Leica GNSS GG04 Smart Antenna was located above the
transducer at a fixed height and provided elevation of the transducer face to reduce the
soundings to datum. Bar checks were undertaken prior to data acquisition and determined a
water velocity of 1518 m/s.
All data were reduced to Australian Height Datum (AHD).




8                            Noosa Council - Noosa River Survey                  20.06.2019