Option

Description

Extract from terrain surface

Select the surface from which the long section should be extracted.

Store to road layer

Select this checkbox and select a layer in which to store the long section. If this option is not selected, the extracted data is only listed for information purposes.

Minimum distance between points

Enter a filter distance to be used to thin out points along the long section.

Extract section from...

Lines

Select this option to extract DTM points from line crossings.

Use strings model

Select this checkbox to include any crossings with terrain and road strings that are encountered in the long section.

This option is disabled if there are no visible road strings or terrain strings to use.

Coordinates

Select this option to extract the long section only from nearby DTM points.

Allowable offset to normal

DTM points within this offset distance from the long section will be used to extract the long section.

Bend point types

Name

Select the Name option to extract the long section along an alignment defined by named points.

Chainages

Select the Chainages option to extract the long section along an alignment defined by the horizontal alignment of the current road file.

Minimum search distance

Enter the maximum distance away from the centreline that will be searched for cross-section line crossings or points. Note that the minimum distance is 100m.

Height the bend points

Select this checkbox to have the bend points assigned a Z ordinate by interpolation (See the Technical Notes in Long Section for details on how the interpolation is carried out).

Save to ASCII file

Select this checkbox to have the long section points written out in comma-delimited format for later import into a spreadsheet or other program.

OK Button

Click to accept the current entries in the dialog.

Cancel Button

Click to cancel the function.