HYSWEEP Performance Test work flow
Preparing the survey
 Find a good location  very flat area, uniform bottom
 Always use RTK
 Create two sets of parallel lines, crossing at 90 degrees (grid)
 Line separation = Water Depth  This facilitates beam stats out to 75 degrees
 Create reference matrix to paint of 1x1 cell resolution
 Survey the Reference Lines at low or high tide. Load SV cast is a must
 Survey the Check lines  These are the middle lines in the NS and EW
Processing the data
 MbMax64
 Load reference surface into the editor
 Use a user defined matrix of a 1x1 grid
 Apply SV corrections
 Filter data out to +/ 45 degree angle limit
 Edit flyers
 Save out to XYZ  one point per cell, average 3 points
 Load the check survey into MBmax64
 Edit Minimally removing outliers and DO NOT user angel limits
 Start the Beam angle test from the tools menu
 pen the reference XYZ surface from the step above
 View the results

 X Axis is beam angle.
 Y Axis is depth difference.
 x’s show bias.
 o’s show repeatability. Maximum difference at 95% confidence.

 Histogram is the distribution.
 Max Outlier = Max difference.
 Mean Difference shows bias between reference and the check lines.
 95% confidence = 2 * Standard Deviation.
