This document describes the HydrOffice QC Tools 2 application (2.7). For the project page, go here.

2.3.5. S57 truncate

2.3.5.1. How To Use?

Truncate all “z” values in a feature file (.000) to decimetric precision.

  • Select the S57 truncate v1 tab on the bottom of the QC Tools interface.
  • Define the decimal place of the truncation (default is 1, thus decimetric truncation).
  • In Execution (Fig. 2.38), click S57 Truncate v2.
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Fig. 2.38 S57 Truncate.

  • After computing, the output window opens automatically, and the truncated feature file is ready to use for chart compilation.


2.3.5.2. How Does It Work?

All “z” values in the feature file are truncated to decimetric precision, as shown in the example in (Fig. 2.39). The truncation to decimeter precision facilitates creation of the HCell (per 2016 HCell Specification units and precision).

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Fig. 2.39 S57 Truncate’s example.

The S57 attributes that will be truncated are listed below.

For SOUNDG objects:

  • Depths

For all objects:

  • Value of Sounding (VALSOU)
  • Height (HEIGHT)
  • Value of depth contour (VALDCO)
  • Depth range value 1 (DRVAL1)
  • Depth range value 2 (DRVAL2)