Point by Line / Polygon Intersection

(This functionality is available with the Computations module)

Creates a new point at the intersection of lines and polygon objects.

To run this option, select the Create/Point command and the Method / Line/Polygon Intersection command from the Computations task to display the relevant dialog box.

The points to be created will be given the attributes currently defined via the Attributes/Point command. You should use that command to set the required attributes before creating any points.

Create Point by Line/Polygon Intersection dialog box

Item	Used to
Point ID:	Key in the identifier to be created of the point to be created. If the function is operating in Block mode the function will create the new points using the next available point identifier from this identifier. The point identifier may also be determined by using the Next or Last buttons.
Line:	Key in, or snap to and accept, the line to be used in the line/polygon intersection. If the function is operating in Block mode this field will be disabled as all lines that satisfy the Block criteria will be intersected with the polygon.
Polygon:	Key in, or snap to and accept, the polygon to be used in the intersection.
Elevations
No Elevation	The intersection point generated will not be given an elevation.
Interpolate Elevation From Line	The elevation of the point will be computed by interpolating along the line.
Interpolate Elevation From Polygon	The elevation of the point will be computed by interpolating along the polygon line.
Integration
Insert Point into Line	If this is selected the intersection point will be inserted into the geometry of the line.
Break Line at Polygon	This option is only available if "Insert Point into Line" has been selected. If selected the line will be broken at the intersection point with the polygon. If this option is greyed, this will be because the Line selected is a circle and these can not be broken. If the function is operating in Block mode and a circle is included in the block then this will also cause this option to not be available.
Insert Point into Polygon	If this is selected the intersection point will be inserted into the geometry of the polygon line.
OK	Creates new points at all intersections between the line and the polygon. If the function is operating in Block mode then all lines that satisfy the Block criteria will be intersected against the polygon.
Next	Update the point identifier field to the next available unused point identifier greater than the point identifier currently shown.
Last	Update the point identifier field to one greater than the highest point identifier in the data base.
Close	Closes the dialog box.

Note: The elevation and contourable point attributes are determined by the computation, not by the point attributes dialog. E.g. If the intersection point is being assigned an elevation and is being inserted into a break line it will be flagged as contourable regardless of the currently set point attributes.