Creating a Terrain Model from Multiple Corridors

Question

I am attampting to create a terrain model from several corridors. The location is in an area where several ramps converge and would like to use the terrain model to define the detailed grading that a simple corridor can not produce. 
 What is the preferred method for something like this? Is the terrain model even considered the best practice here? 
 If I import various features from the corridor they come in as a whole entity which is much longer than what I need. Also, these features can not be modified in any way to trim them to the desired length. 
 I have thought about making horz. and vert. geometry along the desired features but this seems labor intensive. 
 Marc 
 Inroads 674

Adam Wieczorek · Answer

Try to create separate terrain model from each corridor and then create complex terrain model.

Marc Bachand · Answer

I have add good success doing the following: 
 
 Create an offset horizontal feature (offset=0) along the corridor template geometry line over the portion you want to include in the TM. 
 Create a project profile also using the template geometry line.
 
 I noticed that if the TG line includes gaps that the TM does not include it for whatever reason. If you have this situation just add vertical geometry snapping to the offset lines

Import these feature as terrain model boundary elements 
 
 Hope this helps someone. 
 Marc

Chuck Lawson · Answer

I am not sure if this will achieve what you are looking for or not but worth mentioning. If you change the project settings for each corridor to output a "top mesh", then you can make one terrain model where all top meshes would be included. There is also a mesh tool in MicroStation where the boundary of each mesh could be extracted. I have created a video on this topic you might take a peak at. 
 The link will be good for about a week. With the mesh boundary extraction, you would have to make one for each mesh and work with it accordingly. 
 ftp.bentley.com/.../CreatingTerrainModel.zip 
 Chuck

Creating a Terrain Model from Multiple Corridors

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