HD-MAX Echo Sounder User Guide
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(3) Calculating transformation parameters
At least one starting point is needed for fixed difference correction. At least
three starting points and six starting points are needed for surface fitting.
Select the coordinate points involved in calculating. Click [Resolve] and
perform calculation by adopting the selected coordinate points for conversion
parameters calculating. Check the residual error. Generally, the Max. residual
error shall not be less than 3cm. Click [Apply] to apply the calculated
parameters to coordinate transformation parameters setting of current project.
Figure 19-9 Elevation fitting parameters calculation
Point transformation parameters calculation
Point transformation is used for calculation of plan and elevation
transformation parameters between two coordination system. It is mainly
applied for certain engineering survey. Through a given point, perform plane
coordinates transformation after the projection plane coordinates translation
thus to converted to local engineering coordinate system. Before point
transformation calculation, please make sure that GPS instrument connection
parameters of [Equipment] are correctly connected.
