Hydrographic survey

Hydrographic survey

Carried out  from surface vessels or increasingly, from AUV. The following equipmnnet spread is commonly used:

Multibeam echsounder

Sidescan sonar

Sub-botom profiler

Magnetometer

Single beam echosounder

CTD / Sound velocity probe

 

 Predicted tides or tide gauge observations are used to reduce depths to MSL or LAT. The following positioning equipment is often used:

GNSS PPP and DGPS

Gyrocompasses

USBL acoustic positioning

Land survey techniques also feature in:

Shoreline surveys; leveling from tideguage to becnmark; vessel offset and dimcon surveys:

Total Station

GNSS dual frequency static 

Automatic level and staff  

Least Squares Adjustment

(c)2018 Dixon Geos Ltd.

Beach survey