This document describes HydrOffice QC Tools 4.9.9.

2.3.5.3. What do you get?

Upon completion of the execution of Grid QA you will receive a pop-up verification (Fig. 2.27). In the pop-up, each input is listed and associated with the result of the analysis: pass, fail (with number of errors), or skip (e.g., for lack of a depth layer).

Fig. 2.27 The output message at the end of Grid Stats execution.

Grid Stas produces images representing specific statistical analysis:

• Density Distribution (Fig. 2.28).

• TVU QC Distribution (Fig. 2.29).

• TVU QC Overview (Fig. 2.30).

• VR Resolution Distribution (only for VR grids) (Fig. 2.31).

Fig. 2.28 A histogram of the percentage of total nodes that contain a specific sounding per node. To pass a node must have at least 5 soundings contributing to the population of that node.

Fig. 2.29 A histogram of the percentage of total nodes that contain a node uncertainty as a fraction of the IHO TVU. Anything over 1.0 does not pass uncertainty requirements.

Fig. 2.30 A showing the percentage of nodes passing uncertainty requirements across NOAA OCS Quality Metrics.

Fig. 2.31 A histogram, created only for VR surfaces, that shows the percentage of nodes that have a node resolution as a fraction of the allowable resolution at that depth. Anything over 1.0 does not pass uncertainty requirements.

The naming convention of the output files contains important information about the settings that were used to execute Grid QA. Each setting is separated by a period in the naming convention. See the example below.

Fig. 2.32 Example naming convention for a Grid Stats output. In this example the of an output for the TVU QC analysis.