Trimble Business Center

This question came in this am by email and I thought it was capturing the response here so that if anyone else has the same issue, here is a workflow to achieve what they were requesting

Customer had a Drone Survey of a Project Area for the existing terrain. They had a design model for some roads on the project, and they had to create a sideslope to the Drone Survey Surface from the Verge String which was 45 degrees greater than the cross slope  between the Top Back Of Kerb and the Verge string. i.e. they had to add 1:1 slope to whatever existing slope they had between the 2 design strings. i.e. if the Cross Slope between the strings was +5% then the sideslope would be 95% and if the cross slope was -3% then the sideslope would be -103% etc. The question posed was "How Do We Do This or is it even possible?"

Here is a diagram they provided note the 135 degree angle is the same as a 45 degree addition to the cross slope between CR08 and VR08 strings. The Black Line was the desired Fill Sideslope to the Drone Survey Surface.

See the answer on how to do this below

So the video below shows how to do this - but in summary

1. Create a Corridor Model using the Main Alignment provided, targeting Drone Survey as Existing Terrain. Add the Strings provided as reference Lines. Add the Drone Survey and their Design Surface as reference surfaces.
2. In the Corridor, create a Finish Grade Surface Element by Connect using Strings CR08 and VR08 - we will use this to define the source cross slope table.
3. Run a Station, Offset Elevation Report to Excel, use the Surface Cross Sections method, Report at an Interval of e.g. 1.0m (whatever you consider the requirement to be), report at Even Stations, Horizontal Alignment Points, Vertical Alignment Points and Report on the Template. Use the Finish Surface for your Corridor to generate the Report. Include Slope in the Report but not Northing and Easting or Elevation Change. Run the Report to Excel.
4. Edit the Excel Report. Convert the Stations from 0+00.00 to 0.0 numerical values by replacing + with nothing and then apply a format of 3 decimal places. Sort the Report so that all of the VR08 Lines are together and in Station Order. Delete all but the VR08 Data and keep the Station and Slope Columns. Create a New column of Slope data by subtracting 100%from the Slopes computed. Now you have the Station Column and The Slope Column that you need. Copy and Paste those two fields only to your clipboard
5. In TBC - Go to the Corridor Template Editor. Add a Sideslope Instruction from VR08 and use Target Drone Surface and for the Fill Slope use Table method and paste the Station and Adjusted Slope Values into the Table. OK the Instruction to create it. Note this is only the Fill Slopes - I was not asked to do the Cut Slopes so I just used a 1:1 Cut Slope and called it good.
6. Here is the End Result

Here is a video of the process

Alan

Good tip