top of page

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, RTK and DGPS

Gyrocompasses

USBL and LBL acoustic positioning

Total station positioning for alongside platform rigmoves

​

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

​

bottom of page