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This command will create boundary polygons (outline) 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.

The content of the menu

The upper part of the menu contains the project name and the name of the active folder of type Charts.

The Make boundary polygon part:

Options:
- Soundings
- Seafloor

Select to create the boundary from either Soundings or Seafloor:

Soundings: Create boundary polygon and/or holes polygons from the points data. The points will be snapped into a grid before creating the boundary.
Seafloor: Create boundary polygon from  and/or holes polygons from the Seafloor surface.

The Increments Buffer part:
Use Automatic increments: Calculate the increments from the bounding box for the points.

XInc Buffer distance (m): Manually specify increment in X direction.
YInc (m): Manually specify increment in Y direction.
Use YInc=XInc: Use the same increment in Y as in X directionThis parameter is valid for the option Soundings.  Around each point a circle with radius set to the buffer distance is created. The boundary and holes polygons are created by merging the small circles into one or more larger polygons.

The Boundary part:

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

Options:

Keep all boundary polygons: Do not filter away any polygon.

Remove small boundary 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.

Options:

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.

The output file with the generated boundary polygon will ba be saved under each chart with the name Boundary. This this polygon and the holes polygon will be saves as Holes.

Both the polygons can be used by some gridding algorithms, and also exported by the Export Chart Data command.

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