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Survey Point/Project Building Point - want 1st floor at 0'-0"

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rteplow
268 Aufrufe, 4 Antworten

Survey Point/Project Building Point - want 1st floor at 0'-0"

I've been searching through this forum and watching videos about site topography, levels and SP/PBP issues and think I might understand it but still have questions.

 

I've been modeling a house and am about to put in site topography. Basic info:

  • I want 1st floor (T.O. finish floor) at 0'-0"
  • garage T.O.S. at -1'-9 3/4"
  • garage T.O.S. on the site plan I got from builder at 127.17'

As I understand it, Survey Point would likely be at some point on the property boundary with the given survey elevation. Project Base Point would probably be at some building corner, and should it be at 0'-0"?

 

People recommend having the building and the site in separate files. Is this necessary? It's just a single house, not an enormous project. Moreover, I have Revit LT 2021 so I won't be worksharing. I was hoping not to do separate files, but now the client might want an entirely new floor plan so it might make sense to have a single site plan which is linked into 2 separate building files. 

 

So now here are my questions:

  • I move the site down so that survey 127.17' = project -1'-9 3/4" (both = garage T.O.S.) - correct?
  • do I do this whether or not the site is in a separate file from building?
  • do I create the building pad in the building or the site file?
  • is there a difference between a topographic point and a spot elevation?

Thanks in advance.

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Nachricht 2 von 5
barthbradley
als Antwort auf: rteplow

No need to model your Toposurface in a separate Project, but from the sound of it, you may be better off doing so. 

 

If you are creating the Toposurface in a separate Project, you just need to Link your Building into the Toposurface Project and then move the Building Link to the correct position and orientation relative to the Toposurface - and then Publish Coordinates.  Alternatively, you can Link the Topo into the Building Model and move the Toposurface to where it need to be at in relationship to the Building - and then Acquire Coordinates.  

 

With that said, what method are you using to create the Toposurface? Are you creating it from a DWG Import Instance, a Point File, or by manually placing Points?  Or, does it already exist in a separate RVT?   

 

 

Nachricht 3 von 5
rteplow
als Antwort auf: barthbradley

You are such a rock star, Barthbradley! Thanks yet again.

 

I haven't yet started the topographic surface. When I do, it will be with a linked CAD file. Since Revit LT doesn't link to PDF files but Autocad LT does, I linked the site plan PDF to a .dwg file. Luckily, PDFs are scalable!

 

So now I need to study up on publishing vs. acquiring coordinates. Thanks for describing both methods. Do you have a preference?

 

Once I create the site model and successfully link the files, I will mark your answer as having solved it.

Nachricht 4 von 5
lucdoucet_msdl
als Antwort auf: rteplow

@rteplow 

 

Here are some criteria which you could use to help decide whether modeling the site as a separate project file or within the building project file:

 

Same file:

- building location on site is fixed;

- site model not required to be very detailed;

- high level of integration between site work and building.

 

Separate files:

- site model by external consultant;

- detailed site context and/or existing conditions;

- building location on site under study or high probability of adjustment;

- work sharing / large design team;

 

As the separate file workflow is more complicated, I usually default to it as it offers more flexibility for adapting a in progress project to changes. 

In answer to your list of questions:

  • moving the topography point is done whether the site is modeled within or seperately;
  • a building pad is hosted on a toposurface in order to cut or fill the topography. It should therefor be modeled in the same revit project file.
  • The topography point is a control element  which is not typically illustrated on the site plans and is used to convert Revits internal positions to the Real World coordinates of your project. A spot elevation is a type of dimension tag that will read and display the elevation height of the associated element. Spot elevations work with other Revit elements such as floors, beams, etc 

Hope this helps,

 

-luc

 

Nachricht 5 von 5
rteplow
als Antwort auf: lucdoucet_msdl

You've explained everything very clearly, in a way that I can understand, so it helps a lot. Thank you, Lucdoucet.

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