Hydrographic survey

AUV
AUV

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Beach survey
Beach survey

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Base station
Base station

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AUV
AUV

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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