Terrain from survey mess

[moak]

I have a survey that I've made a terrain from by assigning all the contour lines an elevation. It's works out pretty well except where there is a reining wall. At that spot the terrain goes crazy. Has anyone dealt with this before?

(Note - I've deleted the generated terrain in the linked plan and left only the contour lines which are Chief "Elevation Lines.")

plan file link

Thanks!

[Tommy Blair]

Try doing away with some of the elevation lines.

[moak]

Thanks Tommy. That did begin to fix the problem, though it did not completely fix it. I also looked at breaking the terrain line at multiple points along their length which also reduced the effect some.

Ideally, I'd like to find a way that also maintains the integrity of the survey data (i.e. does not remove information.)

[dshall]

Thanks Tommy. That did begin to fix the problem, though it did not completely fix it. I also looked at breaking the terrain line at multiple points along their length which also reduced the effect some.

Ideally, I'd like to find a way that also maintains the integrity of the survey data (i.e. does not remove information.)

You have topo lines on top of top lines under the wall, this is part of the problem.

[moak]

You have topo lines on top of top lines under the wall, this is part of the problem.

They're tightly spaced, but I was deliberate to not cross any lines when creating them. As I've looked at it more the craziness seems to have some relationship with how tightly the lines are spaced.

[Gary Doski]

Thanks Tommy. That did begin to fix the problem, though it did not completely fix it. I also looked at breaking the terrain line at multiple points along their length which also reduced the effect some.

Ideally, I'd like to find a way that also maintains the integrity of the survey data (i.e. does not remove information.)

I have done this many time, you need to clear out the conflicting info.
Call me if you want me to teach you how.

[gawdzira]

I would try getting rid of the tightly spaced topo data (keep it as a graphical representation but lose it as data interpeted by the terrain) and use skinny elevation regions at the retaining walls in order to get a clean jump in elevation at the wall.

[lbuttery]

I have heard it said many times that sometimes less data is better when using the terrain gen

Lew

[moak]

I've found a solution that does not involve getting rid of any terrain lines.

I broke the elevation line between the "bulges." After adding a ton of breaks they've gone away for the most part. I found that in a group of tightly spaced contour lines it is only necessary to break the outermost lines and the inner ones are driven by this new geometry. There's one spot in this plan where I have 5 lines 1/4" apart form one another and no offending bulges. Was about a 20 minute fix.

[sutcac]

I've run into that same situation many times. Looks like you've come up with a nice solution. Is the plan file to large to post? It's one of those things that would be nice to study in the file itself.

[moak]

Here you go Bryce - have a look.
http://dl.dropbox.com/u/21216290/top...ss%20fixed.zip

[billemery]

Kevin,
Thanks for figuring this out.

I've had trouble with this in the past and have resorted to topography symbols (one for the upper topography, and one for the lower). I am in agreement in that I don't like to simplify the topography.

I like your solution because the topography remains live.

Many of the examples in the tutorials are simplified topography that may be adequate for some situations; but there is little information available precise control of complex topography that I often need to represent.

[Rupert]

I have a survey that I've made a terrain from by assigning all the contour lines an elevation. It's works out pretty well except where there is a reining wall. At that spot the terrain goes crazy. Has anyone dealt with this before?

(Note - I've deleted the generated terrain in the linked plan and left only the contour lines which are Chief "Elevation Lines.")

plan file link

Thanks!

Hi together - Hi Kevin.
I am from Austria and have the trial X5 in use.
I have to make a similar task a terrain jump, but I do not succeed.
It seems that the link is broken to your plan-file in Dropbox.
Can you post the link again?

best regards Rupert

[Glenn Woodward]

Rupert,

This is an old thread.
Try using the Terrain Break tool.

[perryh]

Yes, as Glen says, a terrain break line right down the middle of that wall fixes a lot of problems