This document describes HydrOffice QC Tools 4.9.9.

2.3.8.2. How Does It Work?

The grid is scanned for features expected to be represented in the grid as per specification. These features are new or updated wrecks, rocks, and obstructions, and a grid node should be found that agrees with the feature VALSOU.

For each feature, 9 grid node depths are selected: the grid node depth closest in position to the feature, and the 8 grid nodes surrounding it (Fig. 2.50). The minimum depth is selected from those 9 grid node depths, and that minimum depth must match the feature VALSOU (to centimeter precision). If not, a flag is raised. Note, this check not only ensures parity between feature VALSOUs and the grid, but it will also ensure the VALSOU entered is the most shoal depth among the 9 grid nodes atop the feature.

In cases involving multiple grids, once a feature registers a positive match on any given surface, it successfully passes the check. The tool continues to scrutinize all features, whether flagged due to discrepancies or those that have not yet been examined, until every input surface has undergone analysis.

Fig. 2.50 The grid node closest in position to the feature and the 8 grid nodes surrounding it are included in the search. The minimum of these nodes must match the feature VALSOU.