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Tue, Sep 15, 2020 at 3:46:34 PM | markdecker

#16

hanbyjm


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Quoting markdecker from 2006-12-07 

Try this picture out.  Our biggest fear is that we are receiving topo from our surveyors, we are bringing those points into Revit, and then Revit is creating a topo skin that doesn't follow our entered points.  I know that our points are in Revit correctly because when I try to edit the topography they are correct, as shown in the image provided.  I can appreciate the accuracy in section and elevation, but our plan (and hopefully our 3D) needs to be correct too.

Thanks again for the help, its tough to answer these questions.   

"

I am trying to learn more of Revit topography on some down time and trying to replicate our latest project's Autocad site plan in Revit.  I am having the same issues that are in the picture that Mark posted.  I believe it does have something to do with the original survey points.  I am wondering with the Graded Region feature where you can created a new topo surface over an old one if it would be better to start from stratch with a new topo as opposed to trying to revise the old one made with the survey points.  Any one more experienced with Revit topography want to chime back in on this one?


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Tue, Sep 15, 2020 at 6:40:21 PM | Topography Quality

#17

WWHub


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This is one of those areas where if you hand drafted, you would know better what is happening.  Topography lines are really an approximation of what exists. 

 

When I started drafting in the 60's, nobody had the survey instruments you use today.  The only way to represent the 'lay of the land' was to typically shoot a grid on the site.  Typically the smaller the grid, the more accurate the visual outcome.  But I do say "VISUAL".  Typically the elevation at every grid point was feet and inches, never just whole feet.  To figure out where to draw the whole unit topo line, you interpolated between two know points based on their difference.  Hence my use of "VISUAL".

 

Revit actually works the same way creating topo lines at "interpolated" points between other known points.  What Revit draws is as correct as any bodies hand drawing using the same information - actually maybe even better because the point it works from is calculated from several of the different points given to it.

 

So, don't expect Revit's topo to look like an autocad developed on or even a hand drawn one but if all of the points are in the model, the modeled topography will be correct at those points.


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Mon, Sep 21, 2020 at 12:51:10 PM | Topography Quality

#18

hanbyjm


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After messing around with this for a little while, I think it is better to start with a blank flat topo to lay out the new topo surface instead of trying to edit an existing topo.


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