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Generating topography from Civil 3D AECC_COGO_POINT

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    Generating topography from Civil 3D AECC_COGO_POINT

    Hey all,

    One of our guys sent me a .dwg file from our earthworks contractor. I opened it and found proxy elements (AECC_COGO_POINT), and ascertained that I needed object enablers for Civil 3D.

    After installing the enablers, I can see the points, and their elevation value from above. Orbiting the view makes the points disappear?

    Can anyone suggest a workflow to get these points into Revit for generating a toposurface? I have the BDSU, most of which is installed.

    Thanks in advance!
    I used to be high on life, until I realised it was cut with Morons.
    Combating ignorance daily through learning.

    #2
    First thing you will need to do is create a Point Group that includes all of the cogo points. Then you have a few options. You could export the Point Group to a CSV file and then create the Toposurface from that. Or you can create a Surface (in C3D) from the Point Group, then link in the dwg and create a Topo from the TINN layers.

    I typically go the Surface route, since importing points from a CSV (that was created in a survey file) will often cause problems in Revit.
    landarchBIM (landscape architecture + BIM)

    Comment


      #3
      Originally posted by l.schmidt View Post
      I typically go the Surface route, since importing points from a CSV (that was created in a survey file) will often cause problems in Revit.
      Care to elaborate? I'm very much a fan of (AutoCAD dataextraction) of XYZpoints-to-.csv-to-topo and have had no "issues" to date.

      Comment


        #4
        Originally posted by snowyweston View Post
        Care to elaborate? I'm very much a fan of (AutoCAD dataextraction) of XYZpoints-to-.csv-to-topo and have had no "issues" to date.
        If the points are from a survey file, then they will most likely be very far away from the origin. If you try to create a Toposurface from points like this, you will frequently get the warning "Imported Toposurface Points are located a large distance from the model and might not display properly. Points will be centered on the model instead." The imported points are then pretty much rubbish, since Revit will import them however and wherever it deems convenient.

        That has been my experience at least. I'm sure it is possible to modify the points so that they are not too far away from the origin. But I frequently need the dwg import for more than just generating a Toposurface, so that workflow makes the most sense.
        l.schmidt
        Member
        Last edited by l.schmidt; June 24, 2015, 02:50 PM.
        landarchBIM (landscape architecture + BIM)

        Comment


          #5
          Originally posted by l.schmidt View Post
          Points will be centered on the model instead
          In their entirety, but relative to one another the points are still good - so if/when this happens we will relocate the generated topo to the survey location, using the points (in both) for the move tool.

          But I understand the frustration with the limitation - it's a great tool, and could be greater*.


          *and no Autodesk folk, that does not give you your cue to chip in "well there's InfraWorks"... because, well, we'd have already bought C3D if it was THAT big an issue.

          Comment


            #6
            Thanks for the tips guys.

            Can either of you describe the steps for extracting points from AutoCAD? I have very little (read none) ACAD experience.

            Edit: I exploded the aecc points in ACAD. I could then import the info into revit wich generates a topo with 4 points per point (at the end points of each cross) which isn't cricket. I can't seem to get data extract to give me x,y,z points, and I only get 1 point created if I generate a topo from the .csv I extracted...
            Tim West
            Senior Member
            Last edited by Tim West; June 24, 2015, 09:01 PM.
            I used to be high on life, until I realised it was cut with Morons.
            Combating ignorance daily through learning.

            Comment


              #7
              Originally posted by Tim West View Post
              I could then import the info into revit wich generates a topo with 4 points per point (at the end points of each cross) which isn't cricket. I can't seem to get data extract to give me x,y,z points, and I only get 1 point created if I generate a topo from the .csv I extracted...
              Yeah, standard ACAD points will create 1 point per endpoint of the cross marking the point (thus the 4 points). To create a better Topo, you should use contour lines or a TINN. You can generate both contours and TINN in C3D by creating a Surface from your points, but if the CSV method is working then that is probably easier.
              landarchBIM (landscape architecture + BIM)

              Comment


                #8
                Thanks for the response!

                I don't have C3D, or this process would be much easier (I assume) and I would have the skills...

                The .csv method isn't working for me. As I stated above the .csv file only contains 1 point as far as revit is concerned, and a manual edit of the ,csv show all the points bout no x,y,z points.

                What I would like is a dwg file with the tin points so I can create a toposurface from the imported instance in Revit.

                Steps to achieve this would be most helpful :-)
                I used to be high on life, until I realised it was cut with Morons.
                Combating ignorance daily through learning.

                Comment


                  #9
                  (off the top of my head)

                  Open the survey drawing in Autocad
                  Identify the point or block element that's been used by the originator, (they should have an Position X, Position Y & Position Z value) - note the units (m or mm) also
                  Command Line: Dataextract
                  Wizard Steps...
                  First Page : Define the name and location of the .dxe (dataextraction definition file) - I treat this as sacrificial
                  Next Page : Select the drawing(s) you wish to extract from (selecting model space only)
                  Next Page : Select the element you identified earlier in the objects found by the wizard
                  Next Page : Select the properties of that element you wish to extract (Position X, Position Y & Position Z)
                  Next Page : Remove Name and count columns, combine identical rows.
                  Next Page : Select "Export" and set location and name of file - and save to .csv

                  (at this point I tend to swing the .csv into excel to check for monstrous anomolies, but this comes through in Revit, so isn't strictly necessary)

                  In Revit, create toposurface (From points) and select the aforementioned .csv



                  Done-diddly-done.

                  Comment


                    #10
                    Cheers Snowy, very descriptive!

                    Unfortunately :banghead:

                    In the original file:
                    • data extract works, but no x,y,z fields present.
                    • Points don't have x,y,z in properties palette.
                    • Dataextract exports all the properties (thus missing x,y,z).


                    After Exploding points:
                    • Each point is a block a unique name.
                    • Each Block has X,Y,Z coordinates.
                    • Unfortunately When I get to page 3 (Data Extraction - Select Objects) there is nothing in the list.

                    Grrrrargh! Time to call a friend! (hopefully one with teamviewer)
                    Tim West
                    Senior Member
                    Last edited by Tim West; June 25, 2015, 10:24 PM.
                    I used to be high on life, until I realised it was cut with Morons.
                    Combating ignorance daily through learning.

                    Comment

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