Finding Intersection between 2 surfaces in InRoads Ss2

I have 2 surfaces (DTMs) which have certain portions overlapped.

Any function(s) under InRoads Ss2 can find out the edge, point(s) or area about the overlapping?

  • To generate a line representing the intersection of two surfaces (i.e. a design surface and existing surface) you will utilize the Generate Isopach Surface to analyze the two surfaces cut/fill in respect to each other, then use the View Contours or 'Generate Pass Through Contours’ to display a cut/fill line at an elevation of 0 in the ispoach surface. This elevation of 0 in the Isopach Surface will be the intersection of the two surfaces, it is the point where there is no cut (negative elevation) and no fill (positive elevation) between the surfaces.  

    STEPS:

    1. Use the Surface > Generate Isopach Surface command to create a surface that has the difference in elevation between the existing ground and proposed ground.  When using the Isopach command, enter the existing and proposed surfaces. Then toggle on the Isopach Surface and enter a name. On the Staking tab, set the Display Mode to All, and then turn off the text display. This keeps the cut/fill text from displaying and permits use of points from both surfaces to create the final result.

    2. Upon getting the Isopach of the two surfaces, display the contours to show the areas of cut and fill. Change the symbology of the lines as desired.  You can either use the View Surface > Contours command and set up the interval to be very large, like 1000 or you can add in a tool to generate a single pass through contour at a specified elevation.  Go to Tools > Application Add-Ins > Hydrology and Hydraulics, then go to Evaluation > Hydrology and Hydraulics > Pass Through Contours.  Turn off the Dynamics button, select the Isopach surface you generated, select Apply, and in the MicroStation key-in, just type in a zero (0) and select enter to keyin an elevation of 0.  This will be the line for the cut/fill between surfaces.


    For more information about the Road and Site design tools, visit the Road and Site design WIKI at: http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki

    Answer Verified By: Jing Jing