Horizontal uncertainty, Vertical uncertainty, Tidal and Total Vertical Uncertainty (TPU)
Definition
Positional accuracy applies to the degree of uncertainty that can be introduced at the point of measurement, or during processing and visualization.
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Total Vertical Uncertainty (TVU) is the uncertainty of the reduced depths.
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To determine the vertical uncertainty the sources of individual uncertainty need to be quantified. All uncertainties then combined to obtain a total vertical uncertainty (TVU). Factors affecting the vertical uncertainty:
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Total Horizontal and Vertical uncertainty must be recorded at a maximum 95% confidence (2 Sigma) or better to 100% are provided at the 95% confidence level.
Total propagated Uncertainty (TPU) is the sum of the combined THU and TVU.
Checks
Total Horizontal Uncertainty
Total Vertical Uncertainty (via QAX - Quality Assurance Tool)
Tide
Total Propagated Uncertainty
Pass Requirements
1. TVU: Run the 32-bit Geotiff Total Vertical Uncertainty layer through QAX and ensure that the 95% confidence level (order2) has been met for the dataset.
2. THU: Testing currently unavailable
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For the time being there is no tool in Geoscience Australia to test the THU confidence level. During acquisition, ensure that the maximum allowable Total Horizontal Uncertainty was 95% confidence level (order 2) in the mobilization report (only for mountable sensors, we usually don’t receive mobilization reports for the permanent mounted sensors). |
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3. Tide: Ensure that the GPS tide or conventional tide (for generic surveys) has been applied to the data or submitted with the dataset.
4. Combined Uncertainty Bathymetry Estimator (CUBE):
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Make sure the uncertainty of contributing sensors follows appendix E of the Australian multibeam guidelines.
Examples
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Description 2000001S Austrea2 (GA-0223) Test results
Pass Yes Explanation This dataset meets the requirements outlined above and passes checks 1, 3 and 4. Total Vertical Uncertainty check test (TVU) with 100% confidence (which is even higher then maximum 95% confidence). |
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Description 20070011S Tasmount2 (GA-2430/SS02/2007) Test results
Pass No Explanation This dataset does not meet the requirements outlined above as it fails TVU check 1. |