Simplify Geometry Dialog

A check in the Thinning box indicates that the number of vertices of selected objects are to be reduced, according to the Thinning options defined.

A check in the Correction box indicates that the correction of self intersecting polygons and polylines is to be performed.

See Simplifying Object Geometry for further information.

This the minimum distance between vertices in map unit length (m or ft).

Vertices at a distance less than the Min segment length from another vertex will be removed by the thinning process.

Minimum triangle height.

Vertices forming a triangle height less than the specified Triangle height will be removed by the thinning process.

A check in this box indicates that each selected polygon, whose area has changed as a result of thinning, is checked to ensure that it has not exceeded the value specified in the Maximum change in area field.

Enabled when the Polygon area constraint box is checked.

Sets the limit for the maximum change in area.

If this value is exceeded, then individual vertices, which were deleted as part of the thinning process, are reinstated until the change in area is within the specified limit.

A check in this box will remove any spurs (i.e. regions on the polygon boundary connected to the main polygon by a narrow band or spur) whose maximum width is less than the value specified in the Maximum spur width field.

Enabled when the Spur removal box is checked and sets the maximum width of a spur. Any spurs less than the specified maximum width are removed.

Example

The following example illustrates the effect of removing a spur from a polygon:

Before:

The polygon has one spur which is less than the specified maximum spur width.

After:

The spur is now removed.