What Is Chief Doing To Terrain?


keithhe
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Go to solution Solved by glennw,

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This terrain has proven difficult. I thought having the DWG for it would have made things easier, but not the case.

Can anyone explain what CA is seeing that I can't in its interpolation of this terrain? Specifically the rows of divets (very deep) it is adding automatically and nothing I can do to get rid of them. Nothing I've seen on a terrain before. See attached photo and plan.

Suggestions to "smooth" this terrain while keeping the overall slope nature of the lot?

Thanks,

Keith

post-489-0-27757700-1450413565_thumb.jpg

Costa Rica Test.plan

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Thanks Mark !! That looks a lot smoother.

I'm of the opinion that too much elevation data lines in CA just messes things up. Just always too choppy I find, but curiously sometimes I have fairly busy terrains with quite a few elevation lines that look fine, and smooth. If I can just figure out the right combination of elevation data and other parameters to make them all work.

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Thanks Joe. I'll do some strategic removal of elevation lines, as Mark did, which looks pretty good, and see what I can get. I think I will keep the lines, as non-elevation though, for any site work later, but not to generate terrain. Less is better.

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Bill,

I thought that some of the CAD import data may have been wrong, and checked lines in and around the divots (primarily the secondary contours) and could not find anything inconsistent with what should have been there. No other elevation data brought in, so no idea where the divots are coming from, although you got rid of them. Still not sure what you did ??

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I'm not sure what I did, but it works.

 

I thought it was errant elevation data, but now I don't think that is the case.

 

I've done larger properties with steeper slopes without problem.  I usually use two foot contours, but will sometimes use five or even ten foot contours with larger properties.

 

There are some minor divots in this plan, but it's behaving much better that the original plan.  I notice it behaves much better when I use fewer contours although this plan has all of the contours active. 

metric topo 2.plan

post-62-0-04271200-1450427815_thumb.jpg

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Thanks Bill !! No idea how you did this, as I could never get the oddities out of it. I have found that terrain is one of those difficult to understand features of CA, if you are trying to get a real world situation correct. Some of the things just don't do what you would expect. Must be a cake walk for the flatlanders. :)

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Keith,

You have several Elevation Regions that are causing most of the problems.

There is one main culprit in the top left corner of the site and several down in the lower left.

 

The easiest way to delete them all is to select one, click the Match Properties tool, check Object Type (make sure it is an Elevation Region), OK.

This will select all (well, most of them) the Elevation Regions in the plan, hit Delete.

Rebuild the terrain.

 

There are other weird things going on with the plan as well - but the above is the main cause of your problems.

 

Here is a video:

 

http://screencast.com/t/IiVcGgbeI

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Glenn,

 

Curious as to how this may have happened. I added no terrain regions, and simply imported the CAD DWG that as far as I could tell only had the contour lines and the terrain perimeter. The rest, was I though text file related. I will go back and try what you say, but would never have occurred to me that somehow terrain "features" or regions were there. Great catch, and has me curious to figure out where it was coming from. 

 

Thank you sir, as this was really frustrating to see the odd things happening that normal interpolation between elevation lines should not have caused.

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  • Solution

Keith,

 

The Elevation Regions were probably created automatically from closed polylines (contours).

That's all an Elevation Region is - a closed Elevation Line.

 

If you draw an closed Elevation Line (polyline) and open it's dbx, it is actually the Elevation Region dbx that opens - not the Elevation Line dbx.  

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