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Toposurface is off by +750mm

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RAW_MF
565 Aufrufe, 5 Antworten

Toposurface is off by +750mm

Hello,

I am struggling to resolve a toposurface issue and my BIM manager couldn't figure it out either.

 

  • My survey point and project base point elevations are set to 0.0.
  • I created a toposurface by placing points overtop the survey/ grading plan'
  • I split the toposurface/ carved out the area I don't need (i.e. the building at grade)
  • When I modify/ edit surface the geodetic elevations match the underlay exactly
  •  The toposurface is off by 750mm though. It is floating in 3D:
  •  When I annotate a spot elevation the values come up as +750 higher than they are supposed to be.

 

I cannot for the life of me figure out the issue.

 

The only thing that seems to work is if I manually move all the topo points down 750mm... but I would rather not do that unless it's a last resort.

 

Please help.

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syman2000
als Antwort auf: RAW_MF

Did you by any chance use the relocate the project? If you did, this will mess up your topo elevation and will not respect the value you entered in. It is a short coming and you have to take the current elevation and subtract it by 750.

 

If you don't want to do this, you may want to link in your project into new Revit file. Then move it to correct level and then copy over the topo. Then link in the topo into your project.

Check out my Revit youtube channel - https://www.youtube.com/user/scourdx
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RAW_MF
als Antwort auf: syman2000

I did not relocate the project position.

I did however use

  • Coordinates > Acquire Coordinates to establish true north/ project north and
  • Coordinates > Specify Coordinates at point to establish the geodetic elevation of the ground floor datum
Nachricht 4 von 6
syman2000
als Antwort auf: RAW_MF


@RAW_MF wrote:
  • Coordinates > Specify Coordinates at point to establish the geodetic elevation of the ground floor datum

This might be your cause.

Check out my Revit youtube channel - https://www.youtube.com/user/scourdx
Nachricht 5 von 6
barthbradley
als Antwort auf: RAW_MF


@RAW_MF wrote:

 

The only thing that seems to work is if I manually move all the topo points down 750mm... but I would rather not do that unless it's a last resort.

 


 

Move the Toposurface's Internal Points down - those Points inside Edit Surface Mode?  Don't do that. Move the whole Toposurface down 750 ft. in Elevation View.   I don't know why you don't want to do that. That's the way it's done.  Regarding annotations, such as Spot Elevations, Contour Labels, etc. - they are relative to whatever the anno's "Elevation Base" Type Parameter is set to.  

Nachricht 6 von 6
RAW_MF
als Antwort auf: RAW_MF

Thank you @syman2000 and @barthbradley for taking the time to respond.

I was able to resolve the issue:

  • While setting up the file I accidentally moved the project base point without changing the clip state of the project base point.
  • I changed the clip state of the PBP + moved it up 750mm
  • I changed the clip state back + pinned it + hid it
  • This corrected the discrepancy with the spot elevations
  • I need to adjust my datums by 750mm

Lesson learnt - there is really no need to change the elevation on the PBP.

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