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Hydrographic survey
AUV
Beach survey
Base station
AUV
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Hydrographic survey
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Carried out from surface vessels or increasingly, from AUV. The following equipmnnet spread is commonly used:
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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:
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GNSS PPP, RTK and DGPS
Gyrocompasses
USBL and LBL acoustic positioning
Total station positioning for alongside platform rigmoves
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Land survey techniques also feature in:
Shoreline surveys; leveling from tideguage to becnmark; vessel offset and dimcon surveys:
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Total Station
GNSS dual frequency static
Automatic level and staff
Least Squares Adjustment
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