<< Click to Display Table of Contents >> Navigation:  Base module > Sections > Create Sections from Drawing entities > 2D Polyline crossing 3D Polylines

Purpose

To create a section file from a 2D Polyline crossing 3D Polylines (or 2D Polylines with an elevation).

 

Operation

Pick the 2D Polyline. This may define the plan location for a simple section going from A to B, have a number of line elements and/or include arcs.

The 3D Polylines may represent tops and bottoms of banks, design strings, tops and bottoms of embankments etc. The section will default to have zero chainage at the start - use menu item Polyline utilities, Reverse direction to confirm and reverse if required.

 

 

Return to accept default of not using 2D Polylines or enter "Y" if these exist to represent contours or building footprints etc. and have the correct elevation (arc elements are not respected but use menu item 3D Polylines, Convert 2D Polylines to 3D to convert them). Select the 3D Polylines (and 2D Polylines if specified) and enter the output file name.

 

Click the Start button for typical use and a red line appears to confirm the coverage of the section. Note that if the section 2D Polyline includes arcs the red line will appear to "cut corners" but the chainages written to file will respect the true arc geometry.

 

The section is drawn by menu item Sections, Draw Sections.

 

 

Options…

 

Secondary interpolation will "send out offsets" at regular intervals to find a 3D Polyline within the specified range and calculate from these two locations the interpolated level at the horizontal 2D Polyline.

 

 

If a .csv file is required this will be in the order Chainage, Level, Easting and Northing

To draw the section use menu item Sections, Draw Section.