We are trying to derive bathymetry using sentinel images using QGis 2.18. The training data is from a boat gps track taken in 2 days. The depth value captured needs to be corrected for tidal influences. The track has attributes on date and time, position and depth (sonar).
What is the best way to do it?
Is there any formula or free software to correct the data to obtain the mean lower low water needed for the chart?