Forums >> Revit Building >> Technical Support >> topo and project base point and levels -

KennedyDrafting

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Joined: Fri, Apr 24, 2015
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REVIT 2016

I have a project that will be new construction of a house. 

The architect wants a model of the existing topo to be created from a pdf of an old survey.  I can scale the pdf and trace to get contour lines.

Here is where I am getting stuck –

I need the grade/contour labels shown relative to sea level.  And the Floor Levels need be displayed relative the first floor.  Meaning First floor at 0’, Second Floor at 10’, etc.

The architect will change the distance from grade to first floor several times over the design process.  (To see what it looks like with 3 entry steps or 10 steps, because it’s Tuesday, whatever it is that motivates architects to change stuff back and forth.)

So topo is based on real world, sea level contours.  Levels need to be based on distance First floor but first floor will move up and down relative to grade several times.

What is best way to set up the Project Base Point and topo?      

Looked at help, the forms and videos, but I am not getting anywhere.

Thanks for the help.

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WWHub

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Joined: Tue, May 16, 2006
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Wath this:

http://www.youtube.com/watch?v=BigvY4LT-RI

And read this: http://help.autodesk.com/view/RVT/2015/ENU/?guid=GUID-ED2F9C35-5051-4744-ADCF-D3EC1597A1AD

Then come back if you have questions.

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KennedyDrafting

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Thanks, already watched that video and read that help.  But I did watch/read it again.

I still have same questions.

Also, if I move the elevation/height of the house via Project Base point, it will also move the contours.  Contours need to say put.

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WWHub

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Joined: Tue, May 16, 2006
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If you only drew lines for contours, then that was your mistake.

Contours are not precisce - they were an interpretation of point data provided by someone.  Sometimes they are the best you have but understand that they are a guess.   To create a real Revit topo from a PDF, do one of the following:

• Import the PDF into CAD and roughly trace the PDF with 3D polylines (topo layer) set to the correct elevation.  Revit will only use the points that you place at the end of each poly sgment so the more points - the better you will approximate hat you see.  But remomber - tghat topo was created probably form a 50x50 grid.   Now - import the CAD into Revit and tell it to create topography from the CAD.
• Or use photoshop to change the PDF to a jpg and insert that into revit.   Goto the site and massing tab and create the topo from points placed along the 'topo' lines at the correct elevation.

NOTE - real topography will no move with the project base point.

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KennedyDrafting

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"If you only drew lines for contours, then that was your mistake."

I did not draw only lines.  I created a topo surface by placing points using the pdf for reference using autoclicker (http://www.screencast.com/t/llfgwtqI)

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WWHub

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Assuming your levels are set to project and that all levelss are dimention locked floor to floor.  If you unlock the paperclip on the project coordinate, you can set that to any elevation you want and a proper site will not move. Then you can change your ground floor level from what it shows back to 0.

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Project base point moved after I created levels

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