Coastal Hazard Assessment · MCU25/0087

SandMap – Report of Survey for Sunshine Beach Profiles



                   Principle and process for rounding of soundings
           Soundings were rounded to the nearest decimetre, rounding up when values were 0.05 or
           greater.

                   Positioning of selected soundings
           Soundings were positioned in their true location.

                   Digital format of final data
           The data was supplied as a combination of soundings and GNSS pole shots along the profile
           as ASCII files in MGA2020 horizontal datum and AHD height datum.

                   The method(s) used to derive the quality of the data and ability to
                    meet the depth tolerance as required in the standards
           Check lines were run over the main lines. Processed swath sounding data was statistically
           compared with these lines and corresponding data from crossing lines. The RMSE of the
           differences of corresponding data was within 0.3 m at the 95% confidence level (where: RMSE
           (95%) = 1.96 x RMSE (1 sigma)).


           Cross Line comparison
           SBES Equipment Cee Echo                        Date               13/10/2025


               Easting        Northing           AHD                        Easting           Northing           AHD          dE       dN     dAHD
             512001.563     7080029.528        -15.939     Cross Line     512002.265        7080029.347        -15.941      -0.702   0.181    0.002
             512003.578     7080030.575        -15.887                    512003.342        7080030.674        -15.865       0.236   -0.099   -0.022
                                                                                                             Average Diff   -0.233   0.041    -0.010




                   The time frame(s) and those responsible for retention of raw data
                    gathered during the survey and the final results
           Raw and processed survey data will be stored for a minimum of 2 years by SandMap.

           Deliverables
           The deliverables comprise the following:

 Description                                                       Format
 Sunshine_Beach_SBES&RTKGNSS_MGA2                                  Combined profile survey data in ASCII xyz format.
 020_AHD.xyz
 Sunshine Beach Profiles Survey Plan -                             Hydrographic survey plan in PDF format.
 SM1077 - SandMap.pdf




Rev. no.    Doc No.                                            Version Date          Doc Approver
  1         P0100-20251020                                     20/10/2025            Rod Tansley                                 Page 13 of 20

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