Monday 9 December 2019

Using Civil3d and SAGA GIS to create .las file for TGC Designer tools

This workflow has come about due to the potential loss of our community golf training facilities and the need to present options for the relocation of the facilities to a new piece of land.

Initially I mapped out a rough concept for a new course by hand on an aerial photo and then draw it up in CAD using Autodesk Civil3d.

Then I cam across TGC-Designer-Tools that allows you to import surface and design information from Open Street Map into the game “The Golf Club 2019” which has designer functions to model up a golf course.

One of the limitations of the TDC-Designer-Tools at this stage is that you can only import .las files of lidar for the elevation data.

There is however a lot of surface elevation data that is freely available on the internet in other formats. Normally in a post processed format from the original lidar data. In order to use this data in a course or surface data from Civil3d it has to be converted into a .las file format some how.

Fortunately there is an open source GIS program “SAGA GIS” that has just the toolsets you need to import surface data in various formats and convert it into a .las file that can be imported into TGC-Designer using TGC-Designer-Tools as a basis for your design.

What follows is the workflow in progress I have developed to take a design surface from Civil3d and convert it into a .las file for import into TGC-Designer.

1. Download and install SAGA GIS
2. From Civil3d export a DEM file of the design ground surface you want to make into a .las file.

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3. Dragged the DEM file into SAGA GIS.

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4. Using the PointCloud from Grid Points created a point cloud.

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http://www.saga-gis.org/saga_tool_doc/2.2.3/pointcloud_tools_2.html


5. View the point cloud data and added a field “Class” for the classification and added 2 for "Ground" for the value of the class

http://www.saga-gis.org/saga_tool_doc/2.2.7/pointcloud_tools_6.html

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6. Used the Export .las file to export out the .las file.

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7. Imported the the .las into TGC designer tools following this tutorial.

https://chadrockey.github.io/TGC-Designer-Tools/TUTORIAL

Helpful Tutorial on Saga GIS

https://www.youtube.com/watch?v=wAUtojgDsTA&list=PLQlQ0PBGc1s9HBXI-YhVRxDu5cEjB7l_D

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