Convex Hull

Convex Hull converts the selected items into convex Polygon, LineString or Point items.

Select Analysis > Geometry > Hulls > Convex Hull.

Convex Hull draws a convex outline around the selected geometry. This usually results in a Polygon item but a convex hull created from a point item is a point and a convex hull from a single LineString segment is a LineString.

If you select multiple LineStrings or Points, you can create a convex hull from these if you first convert them to a MultiLineString or multi-point item, using for example, Union.

A convex hull is the convex shape surrounding the MultiLineString or multi-point as though each point is a nail and the boundary is a rubber band:

Alternatively if you are using points you can generate a TIN:

See also Creating a TIN from a grid.

This command is part of the OGC Simple Features Specification.

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