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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 propagated Uncertainty (TPU) is the sum of the THU and TVU. 

Checks 

1. Total Horizontal Uncertainty 

2. Total Vertical Uncertainty (via QAX - Quality Assurance Tool)

3. Tide 

4. 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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1. Tide: Ensure that the GPS tide or conventional tide (for generic surveys) has been applied to the data or submitted with the dataset. 

2. Combined Uncertainty Bathymetry Estimator (CUBE): Ensure TPU follows appendix E of the Australian multibeam guidelines.  

Examples

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title Pass example
Description 2000001S Austrea2 (GA-0223)  Test results   Image Modified TVU: Check completed/pass.  THU: N/A  Tide applied to the data.  CUBE grid created.   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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title Fail example
Description 20070011S Tasmount2 (GA-2430/SS02/2007)   Test results   Image Modified TVU: Check completed/fail.  THU: N/A  Tide: N/A  CUBE: N/A  Pass  No  Explanation   This dataset does not meet the requirements outlined above as it fails TVU check 1.