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Heave Compensation for Hydrographic Surveying.

ADA609356

Publication Date	1985
Page Count	7
Abstract	Improvements in hydrographic surveying technology, particularly depth measurement accuracy, have been supported by the Corps of Engineers. This note discusses state-of-the-art heave compensation methods as well as the development and commercial availability of heave correction equipment. Survey boat heave (vertical boat movement resulting from wave action) can be a major contributor to errors in depth measurements. In the past, manual or automatic smoothing of the data was the only practical way of partially correcting wave-induced errors. New techniques now give surveyors the opportunity to incorporate heave abatement equipment in their standard surveying operations and thereby produce higher quality surveys. Several approaches have been considered for measuring of alleviating heave- induced errors in hydragraphic survey of depth measurement. The most widely used approach has been to measure the survey boat motions, along with depth and position, and correct the motion-induced errors during post survey processing. A second approach has been to experiment with different hull designs for the purpose of reducing vertical boat motions ttoan acceptable level so that no corrections are necessary. A third approach is to separate the depth measurement transducer from the survey boat by using submerged, towed; or remote controlled transducer platforms.
Keywords	Heaving Hydrographic surveying Boats Commerce Compensation Corrections Depth Errors Manual operation Measurement Oceans Quality Searching State of the art Towed bodies Vertical orientation
Source Agency	Non Paid ADAS
NTIS Subject Category	47C - Physical & Chemical Oceanography 48E - Soil Sciences 50D - Soil & Rock Mechanics
Corporate Authors	Coastal Engineering Research Center, Vicksburg, MS.
Document Type	Technical Report
Title Note	Technical note.
NTIS Issue Number	201505

Heave Compensation for Hydrographic Surveying.

Heave Compensation for Hydrographic Surveying.
ADA609356

Publication Date	1985
Page Count	7
Abstract	Improvements in hydrographic surveying technology, particularly depth measurement accuracy, have been supported by the Corps of Engineers. This note discusses state-of-the-art heave compensation methods as well as the development and commercial availability of heave correction equipment. Survey boat heave (vertical boat movement resulting from wave action) can be a major contributor to errors in depth measurements. In the past, manual or automatic smoothing of the data was the only practical way of partially correcting wave-induced errors. New techniques now give surveyors the opportunity to incorporate heave abatement equipment in their standard surveying operations and thereby produce higher quality surveys. Several approaches have been considered for measuring of alleviating heave- induced errors in hydragraphic survey of depth measurement. The most widely used approach has been to measure the survey boat motions, along with depth and position, and correct the motion-induced errors during post survey processing. A second approach has been to experiment with different hull designs for the purpose of reducing vertical boat motions ttoan acceptable level so that no corrections are necessary. A third approach is to separate the depth measurement transducer from the survey boat by using submerged, towed; or remote controlled transducer platforms.
Keywords	Heaving Hydrographic surveying Boats Commerce Compensation Corrections Depth Errors Manual operation Measurement Oceans Quality Searching State of the art Towed bodies Vertical orientation
Source Agency	Non Paid ADAS
NTIS Subject Category	47C - Physical & Chemical Oceanography 48E - Soil Sciences 50D - Soil & Rock Mechanics
Corporate Authors	Coastal Engineering Research Center, Vicksburg, MS.
Document Type	Technical Report
Title Note	Technical note.
NTIS Issue Number	201505