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Thread: Topo Points in 'Edit Surface' don't match Survey

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    Topo Points in 'Edit Surface' don't match Survey

    While in the 'Edit Surface' command the Elevation of my topo points don't match the Spot Elevation tool outside of sketch mode. I'm convinced this has something to do with how the file was setup or maybe the order of operations in which the Project Basepoint was unclipped and moved.

    Here are some screenshots of what I mean.

    1. Image shows a spot elevation on the lower-left corner of the site. The elevation reads 117.33' (This number is accurate to the survey we received)

    Topo Points in 'Edit Surface' don't match Survey-1.jpg

    2. The same lower-left corner while in the 'Edit Surface' Command, notice the elevation of the point is 100'

    Topo Points in 'Edit Surface' don't match Survey-2.jpg

    What I can tell you is that the Project Basepoint in the template starts off 100' above the Survey Point, then I enter the Survey Point elevation per the survey and the Project Basepoint per our Finished Floor Elevation. This seems to set things up nicely for Spot Elevations and Levels, but whenever i'm in 'Edit Mode' Revit reverts back to the original 100' elevation Project Basepoint. For example, in the screenshots above my survey point is 117.33' above sea level and if I wanted to add a point that's 120.33', I actually need to enter in =120.33'-17.33', so that the elevation is related back to 100'. Weird, right?

    I've attached the Revit file if anyone kindly wants to look into this
    Attached Thumbnails Attached Thumbnails Topo Points in 'Edit Surface' don't match Survey-1.png  
    Attached Files Attached Files

  2. #2
    Forum Co-Founder Twiceroadsfool's Avatar
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    Edit mode, the points will always show the elevation WRT the level the Topo is assigned to. It's why some folks suggest putting a level down at site 0-0, and assigning topos to that level.

    Sent from my Pixel 3 XL using Tapatalk

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    Senior Member PatrickGSR94's Avatar
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    You can get around this by moving levels up to the actual survey elevation, then unclipping the project base point and moving that up the same amount (if you want FFE to be zero), or 100 less than the amount you moved the levels if you want your FFE to be 100. Then re-clip the project base point.

    Works best to do this as early as possible in the project, because all elevations and sections' crop regions will also need to be moved up to the model's new location.

    This is the only way to have the toposurface spot points read real world elevations while editing, aside from doing a separate site file containing the toposurface.
    d.stairmand likes this.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Goodness, I would throw an extra level down at site 0.00 before I would try actually moving the levels and the model. Then you just cut the Topo to clipboard, paste aligned to selected level, pick new site level, edit topo, pick all points, move command, raise them back up.

    Takes five minutes. No need to mess with the base points or levels at all.

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    willsud likes this.

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    Senior Member PatrickGSR94's Avatar
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    Maybe if your topo is finished and completed, that might be faster. If topo grading is ongoing, moving the levels and PBP is the easiest way to have the toposurface points read real world elevations during editing. This method was originally posted by jeffh a number of years ago, and it works so well that I have a PDF of his post saved on our server to refer back to. If done fairly early in the project, it works great and takes much less than 5 minutes to do.

    Topo Points in 'Edit Surface' don't match Survey-capture.jpg

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    Forum Co-Founder Twiceroadsfool's Avatar
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    We disagree.

    For the OP that was asking: The action of putting the level down at 0-0 and re-moving the topo is a one time corrective action, and it stays there, forever.

    From that point on through ANY topo edits, ALL points show actual site elevation, no matter what changes on the job.

    Yeah, both methods will work. YMMV, I suppose.

    Sent from my Pixel 3 XL using Tapatalk

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    Quote Originally Posted by Twiceroadsfool View Post
    We disagree.

    For the OP that was asking: The action of putting the level down at 0-0 and re-moving the topo is a one time corrective action, and it stays there, forever.

    From that point on through ANY topo edits, ALL points show actual site elevation, no matter what changes on the job.

    Yeah, both methods will work. YMMV, I suppose.

    Sent from my Pixel 3 XL using Tapatalk
    I might still be missing something, but hosting the topo to a different level isn't working for me. While in sketch mode the elevation that appears for each point is measured from Absolute Elevation, which I learned is from the Project Basepoint (no way to change this). Even if I host my topo to a different level unless I move the PBP with it, the problem still persists. What I've found to work is while editing points, select them all and move them to their heights measured from Absolute zero, then move them back down before closing the sketch. Seems like a silly workflow but I don't see another way

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Quote Originally Posted by billiam View Post
    I might still be missing something, but hosting the topo to a different level isn't working for me. While in sketch mode the elevation that appears for each point is measured from Absolute Elevation, which I learned is from the Project Basepoint (no way to change this). Even if I host my topo to a different level unless I move the PBP with it, the problem still persists. What I've found to work is while editing points, select them all and move them to their heights measured from Absolute zero, then move them back down before closing the sketch. Seems like a silly workflow but I don't see another way
    You are missing it. Cut and paste the entire topo to a view based on the new level.

    The points are NOT tied to PBP. That's not correct.

    Sent from my Pixel 3 XL using Tapatalk

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    There's not really an Absolute Zero in Revit (unless I missed something).
    There's a nominal 0 elevation plane, but where you set levels is immaterial.
    I did a four building complex on a craggy hillside. FFE ran from about 732 to 755 (we and the Civil needed to coordinate for ADA access between all the buildings). Lake level was 725 (reservoir elevation).
    The federated model did not much care that the buildings had those differing Levels. The Models of the individual buildings did not much care.
    The Civil's CAD of the sit e"lived" about elevation 500 for the while it was loaded.
    Over seven changes in the topo over the span of the project, which necessitated some tweaking of elevations.
    Most of the trouble was from Revit 2010 not havign a very elegant set of topo features.

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