Many times your design files are provided to you in 2D. The topography in these is illustrated through contour lines and other elevation information. Importing that file into Virtual Surveyor does not directly create a triangulated design surface that can be used for further analysis. However, Virtual Surveyor makes it possible to import that 2D plan and convert it into a design surface ready for advanced calculation.
This article takes you through a step-by-step guide to using a 2D CAD file to generate a design surface.
- Import 2D Data
- Select Specific Design Items
- Add Elevation to Design Items
- Create a 3D Design Surface
- Notes for 3D CAD Files
- Related Video
Import 2D Data
Import the 2D data plan using the Drag and drop (or upload) feature within the Project View.
- Virtual Surveyor supports .dxf, .xml, .kml, and .shp CAD files for import.
- It is also possible to import Point files as .csv or .txt.
Select Specific Design Items
2D plans usually contain a lot of information. You have to focus on design items that show the projected topography like contour lines, elevation points, or any other elevation annotations.
- Click on each of the design items and note their layers.
- In the Project View, turn off all layers and then activate the specific design items layers only.
Add Elevation to Design Items
As these are 2D, the design items must be edited to add an elevation.
- Select a polyline and in the TOOLS tab, click on Edit Vertex.
- Tick the Z box under Edit Vertex Mode.
- Select all (Ctrl + A) vertices and change the elevation value in the Z box under Vertex Coordinates.
- All the dots along the polyline are highlighted purple when selected.
- Repeat this process for all the design items (you can edit all the points' Z values in the same way).
Create a 3D Design Surface
Once all the design items have been edited:
- Deselect everything by pressing Esc.
- Click on Triangulate All to generate the design surface.
- Select the design surface and in the TOOLS tab click Modify Terrain.
Your Design Surface is now ready to be used as a reference in Cut/Fill maps calculations.
Notes for 3D CAD Files
If you get a 3D CAD file from the design office, the 3D TIN surface can be imported directly into Virtual Surveyor.
- Remember to modify the terrain, according to that surface, to generate a design surface ready for Virtual Surveyor.