Content Comparison

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Introduction

This command will create boundary outline polygons (outlineboundary ) and/or interior holes from either points of surfaces in the selected chart(s). The command has options to make the polygons from Soundings or Seafloor data objects in the charts.

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The Make Boundary and Holes dialog

The content of the menu

The Make

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polygons part: 

Select to create the boundary polygons from either a points or a surface dataset.

Options: 

• From Soundings: Create outline and/or holes polygons from the Soundings dataset.
• From Seafloor: Create outline and/or holes polygons from the Seafloor surface.

OptionsOr: 

• From SoundingsPoints: Create boundary outline and/or holes polygons from the points dataselected point dataset(s).
• From SeafloorSurface: Create boundary  andoutline and/or holes polygons from polygons from the Seafloor selected surface(s).

The Buffer part

Buffer distance (m): This parameter is valid for the option Soundings or Points.  Around each point a circle with radius set to the buffer distance is created. The boundary outline and holes polygons are created by merging the small circles into one or more larger polygons.

The

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Outline part

BoundaryOutline: Check (set) this option to generate the result result outline (Boundary) polygon.

Options:

• Keep all boundary outline polygons: Do not filter away any polygon.
• Remove small boundary outline polygons: Use filter to remove "noisy" polygons from the data. Specify number of Buffer circles for the size if the polygons. If the option is to create boundary from the Seafloor, the size of one Grid cell is used as the smallest unit.

The Holes part

Holes: Check (set) this option to generate the result Holes polygon.

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• Keep all holes polygons: Do not filter away any polygon.
• Remove small holes polygons: Use filter to remove "noisy" polygons from the data. Specify number of Buffer circles for the size if the polygons. If the option is to create holes from the Seafloor, the size of one Grid cell is used as the smallest unit.

The Chart Name part

Select from the list which charts to apply.

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The Dataset or Surfaces part

Select from the list which datasets to apply.
The output file with the generated outline polygon will be saved under each chart with the name 'dataset_name'_outline and the holes polygon will be saved as 'dataset_name'_holes.