CH Hydrographic Survey Standards & Quality Control

Question 1

What is the primary purpose of IHO S-44 standards in hydrography?

Accepted Answer

Establish hydrographic survey accuracy levels

Answer

Determine the water temperature

Answer

Measure tidal currents

Answer

Monitor salinity variations

Question 2

What does Total Vertical Uncertainty (TVU) refer to in hydrographic surveying?

Accepted Answer

Uncertainty in vertical positioning of soundings

Answer

The maximum water depth

Answer

Uncertainty from GPS signals

Answer

Variation in wave heights

Question 3

Which of the following best describes a patch test in multibeam surveys?

Accepted Answer

A calibration procedure for multibeam alignment

Answer

Testing for sea conditions

Answer

A test of software version updates

Answer

Measuring sediment composition

Question 4

Why is crossline data collection important in hydrographic surveys?

Accepted Answer

To verify main survey line data

Answer

To measure current direction

Answer

To record wind speeds

Answer

To estimate salinity gradients

Question 5

Which software function helps identify outliers in bathymetric datasets?

Accepted Answer

Data cleaning

Answer

Coordinate transformation

Answer

Geoid modeling

Answer

Tide correction

Question 6

What does the term 'sound speed correction' refer to in quality control?

Accepted Answer

Accounting for changes in water column velocity

Answer

Adjusting echo intensity

Answer

Correcting sonar beam angles

Answer

Modifying GPS positioning