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

Selected lines sidescan sonar data were processed in the Chesapeake Technology SonarWiz
package using the following workflow:
     •   Load XTF files as exported from QINSy;
     •   Check real-time bottom tracking (for slant range correction of imagery) and if necessary
         re-track using automated or manual techniques;
     •   Build Empirical Gain Normalisation (EGN) curves for main lines of each block. Apply
         EGN to files for image enhancement;
     •   If necessary, adjust DC gain associated with selected lines to better match image
         intensity across all lines used to create the mosaic;
     •   Save final / acceptable mosaic as a gray-scale GeoTiff (palette assigned acoustic
         shadows as dark pixels and high backscatter returns as light pixels).


Data deliverables included:
     •   Ungridded, geospatially-corrected, cleaned bathymetry points;
     •   Gridded, geospatially-corrected, cleaned bathymetry points;
     •   Contours at 0.5m in DXF format;
     •   8-bit backscatter mosaics of selected survey areas;


Although not delivered as part of the initial data set, we intend to assemble and submit a
Fledermaus Scene that captures all available data acquired during the survey operations and
supplied by Noosa Council as background information. We view this Scene as being
potentially useful for illustrating riverbed / seabed features that exist across the Noosa River.




16                             Noosa Council - Noosa River Survey                      20.06.2019