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Comparison of Topographies

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shershahbacha9
2911 Aufrufe, 43 Antworten

Comparison of Topographies

Hello !!

I created same topography by different means and need to compare it visually with accurate topography in revit which i already have. I want to compare it like kind of having grids and place two sites over each other so could see along the profile how much deviation is from original topography. Is it possible ? Can anyone help.

below is screenshot of how my topography looks like

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MostafaElashmawy
als Antwort auf: shershahbacha9

you can put both in same file, then assign a different phase for each of them. For example, Topo 1 created in phase 1 and demolished in phase 2. Topo 2 created in phase 2.

in that case, each will have a color. you can compare visually either in 3D or in sections.

 

In addition, if you select Topo 2, you can find the difference of Cut and Fill between both.

Mostafa Elashmawy
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shershahbacha9
als Antwort auf: MostafaElashmawy

the topographies are created freely and not geo referenced, i mean i dont know its position. so should i first make them lay on coordinates where they actually lay and then do this phasing ?

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barthbradley
als Antwort auf: shershahbacha9

Are you saying that you created a Revit Toposurface via 2 different methods and want to compare both.  What methods did you use?  By Import Instance and By Point File?  Tell us a little more. 

 

One thing you could to is a Point count of the 2 Toposurfaces.  Each Point creates a triangulated surface, so if one Toposurface has less Points, then it has less triangulated surfaces making up the whole Toposurface.  

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barthbradley
als Antwort auf: shershahbacha9

Just saw your screenshot.  Are those the two Topsurfaces you want to compare?  I can eyeball them and tell you that they are not the same.  

 

...Turn on Triangulation Edges under Topography Category in VGO.  

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MostafaElashmawy
als Antwort auf: shershahbacha9

Yes sure you should first place them per the correct coordinates and levels then apply the phasing to be able to compare them.

It would also help if they exactly have the same boundary.

Mostafa Elashmawy
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barthbradley
als Antwort auf: MostafaElashmawy

How would one place two different Toposurfaces at the exact same elevation? It can't be done.  But you could align a single POINT in one Toposurface to a single POINT is another Toposurface -- if those two Points are referencing the exact same site feature.  

 

Depending on how the Toposurfaces were created, they could already be sharing the exact same Origin, since Toposurface Point Elevations are relative to the Internal Origin of the Project. 

 

Understanding how the Topos were created; knowing that exact workflow, would make it a whole lot easier to advise.  

Nachricht 8 von 44
MostafaElashmawy
als Antwort auf: barthbradley

Did you read my response?

I didn't say that he should place the two topos to exact same elevation.

I said: " place them per the correct coordinates and levels" "It would also help if they exactly have the same boundary."

 

 

 

If he placed the two Topos in the same file and each Topo have its correct coordinates and level, he can easily compare them.

Usually this practice is done to compare same plot before and after excavation.

 

 

Mostafa Elashmawy
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barthbradley
als Antwort auf: MostafaElashmawy

Thank you for editing out that unnecessary remark.  It reads much nicer without it.  

In answer to you question: Yes, I read your post where you said "place them per the correct coordinates and levels". The operative word here is "place". I'm wondering how you could "PLACE" two dissimilar Toposurfaces at the "CORRECT COORDINATES AND LEVELS". Maybe, I'm misunderstanding you, but aren't you suggesting that the OP precisely OVERLAP the 2 Toposurfaces? 

 

Also, what do you mean by your statement: "usually this practice is done to compare same plot before and after excavation"?   This one has got me scratching my head as well.  

Nachricht 10 von 44
RDAOU
als Antwort auf: shershahbacha9

You could have used "Grade Region" tool and generated both topographies in the same file …

 

If you have them  in different files, do the following

1. In File A … export the topo surface to CAD/DWG then close the file

2. Open file B and import CAD 

3. Create Toposurface from Import (can delete the imported DWG after)

4. Select 1st toposurface and set Phases

     a Created: New Construction

     b. Demolished: None

5. Select 2nd toposurface and set Phases

     a Created: New Construction

     b. Demolished: New Construction

 

Create schedule to compare cut/fill/net cut and fill/projected area 

 

Graded Region 1.png       Graded Region.png

YOUTUBE | BIM | COMPUTATIONAL DESIGN | PARAMETRIC DESIGN | GENERATIVE DESIGN | VISUAL PROGRAMMING
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Nachricht 11 von 44
MostafaElashmawy
als Antwort auf: barthbradley

Ok let me explain more:

Why would we compare two Topos?

Through different projects I worked at, we never compare Topographies unless they are for the same area. For example, we have the existing Topography of some area, then we have another Topography for the same area after expected grading.

We do this to assess the quantity of cut and fill and try to balance them. 

for example, we have a small hill in our land and some road need to pass by this hill. if we made our design based on the road passing at the middle of the hill, all the earthwork will be excavation. but if we shifted it a bit to the right, we may have the fill nearly equal the cut so we don't need to pay money for transferring materials or for buying fill material.

 

In above case, we have three topographies:

1- existing Topo based on points received from site. Coordinates and levels in a grid.

2- First option grading from designer which is points at edges of roads and landscape areas also with coordinates and levels.

3- Second option grading from designer but may be this time as contours from Civil 3D program.

 

To compare them, we place each topo based on the coordinates and levels. The three Topos will lay at same boundry but each one will have its own points.

 

I hope that  above explains my point of view.

Mostafa Elashmawy
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MostafaElashmawy
als Antwort auf: barthbradley

Another case where I had to compare Topos of same area is when I had 4 Existing Topos from 4 different sources for the plot. The area was huge and no time to send a surveyor to make a detailed survey. We could only take a point every 300m x 300m

1- first Topo was extracted from an DEM - 30 (Digital Elevation Model) from municipality

2- Second Topo was from another model owned by another engineering office

3- Third topo was extracted from Google earth.

4- Fourth Topo is based on the available data from site.

 

We had to compare each of the 3 Topos to check which of them is the nearest to the fourth Topo from site. by cross checking the elevation at the 300x300 points.

 

Let me know if that was clear.

Mostafa Elashmawy
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MostafaElashmawy
als Antwort auf: RDAOU

The Graded region way would work if the two topographies have the exact same boundaries. 

Mostafa Elashmawy
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barthbradley
als Antwort auf: MostafaElashmawy

Gentalmen: no offense, I respect you both; but neither one of the workflows you have described makes any sense to me -- and I've been doing this for over 30 years; working with surveys, grading, etc. on almost a daily basis. The best the OP can hope do with those workflows is guesstimate badly.     

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RDAOU
als Antwort auf: MostafaElashmawy

 

Whats the point or sense in comparing a topo surface for a plot in Upper East NY with a topo surface in New Delhi … It only makes sense comparing 2 topo Surfaces that have the same boundary/property line. 

 

But again, there are odd workflows and procedures everywhere...I cant find any sense or purpose in comparing topo with respect to anything extracted from GOOGLE!!! map (same boundary or not lol)

 

Cheers,

YOUTUBE | BIM | COMPUTATIONAL DESIGN | PARAMETRIC DESIGN | GENERATIVE DESIGN | VISUAL PROGRAMMING
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barthbradley
als Antwort auf: RDAOU

The "comparing" is not the problem. I can compare to find the difference between two Revit Toposurface's Projected and Surface Areas all day long and twice on Sundays.   

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ToanDN
als Antwort auf: shershahbacha9


@shershahbacha9 wrote:

Hello !!

I created same topography by different means and need to compare it visually with accurate topography in revit which i already have. I want to compare it like kind of having grids and place two sites over each other so could see along the profile how much deviation is from original topography. Is it possible ? Can anyone help.

below is screenshot of how my topography looks like


1. What exactly are those different means?

2. Did you create the 'accurate topography in Revit' using yet another means?  What is it?

 

Now, to compare them visually, link each of the 'toposurfaces' as an in-place mass or a generic model (assuming they are DWGs), move them as close as possible to the 'accurate' one, create a bunch of grid lines and create Elevation > Framing elevation and tick Attach to Grid then select the grid lines to create the views.  Open each view and compare the cut profiles of the topos and write your report.

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shershahbacha9
als Antwort auf: barthbradley

I created one toposurface by clicking points and giving its elevation as autocad file was underneath. This one is the standard with which we have to compare other toposurfaces . Other methods are by using plex.earth plugin in Autocad and bring that .dwg to Revit , and using sketch up and bringing as .dwg to Revit

Nachricht 19 von 44
shershahbacha9
als Antwort auf: MostafaElashmawy

I am having the same case as you. I have to compare topography of the same area to show the topography accessed by which method is resembling more to the standard one. I am confused for giving it coordinates and leveling it , because when topography is created by any method lets say from .dwg it is created somewhere in air and i dont know how to bring it to its own coordinate system and level. Also i will be comparing 2 or 3 topographies to the standard one

Nachricht 20 von 44
shershahbacha9
als Antwort auf: RDAOU

The topographies i want to compare is of same area but accessing it by different methods. Then we have topography made by surveyor data which is our standard. And with this standard we have to compare other topography of same area by different methods . I have to see which method of creating topo is more accurate.

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