Option

Description

Chainage - Start and Stop

Enter the first and last chainages of the portion of the horizontal alignment to process.

Section width - Left and Right

Enter the distances left and right of the centreline over which to extract the cross-section.

Extract from terrain surface

Select the surface that contains the points/line model from which to extract sections.

Store to road layer

Select this checkbox and select the road layer in which the extracted cross-section must be stored. If this option is not selected, the extracted data is only listed for information purposes.

Extract sections from

Break lines

Select this option to extract sections from line model intersections.

Coordinates

Select this option to extract sections directly from points along the cross-section.

Apply DTM point filter

Select this checkbox to display the Point Filter and to only extract cross-section points from filtered points.

Allowable offset to normal

Only available if the Coordinates option has been selected in Extract sections from...

Enter the distance around the normal to the centreline that will be considered when searching for a point to use in the cross-section, in order to accommodate points that might not be exactly on the normal to the centreline.

Minimum distance between points

Enter a minimum distance to be used to thin out points along the cross-section.

Section search distance

Enter the maximum distance away from the centreline that will be searched for cross-section line crossings or points. Note that the actual maximum search distance will be the greater of this distance and the specified left and right section widths with a minimum distance of 100m.