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    Co Ordinate issues

    Hey all,

    Having some fun with setting up a survey in revit from a supplied survey dwg. This has coordinates which reference the Perth coastal grid. Basically a coordinate grid which lays over the city and all surveyors can reference back to.

    I have located two points in the dwg to use as reference point, basically they are survey stations. I have located the x & y locations. (see image 1 Cad Survey). The dwg is drawn in meters (as they all are over here) and the 0,0 point is...you guessed it, outside of the Revit Happy Zone:banghead:
    I set the import settings (see image 2) and bring the dwg link into the Revit file using CTC.

    I then un-clipped the survey base point and moved it to one of the survey station points and used "specify Coordinates at a Point" and set it to match the known point in the dwg file. OK all good.

    I have set the tags to reference back to the Survey point. I then checked to see if the second survey point is correct and discover that location of the point is not reading as I would expect it to. The Easting has added the distance away from the Survey Point approx 5m and the Nor-thing has deducted the distance from the Survey Point.....is this correct? I need the coordinates to match the supplied dwg so the building can be set out according to the Perth Coastal Grid, not referring to a local point on the site.

    Is it a case of moving the survey point to the original 0,0 of the cad file? will this create the "elements too far from origin" errors that i am trying to avoid?
    Any ideas what is going on here?
    Attached Files
    Andrew Harp
    BIM Manager GHD
    If you are not willing to learn, no one can help you.
    If you are determined to learn, no one can stop you.

    #2
    So, I have got it to work.
    1 find coordinates in dwg to use as reference points.
    2 link dwg file in, using CTC
    3 rotate the dwg file to resemble your desired project north orientation, using your reference point as the rotation point.
    4 unpin the survey and project base points.
    5 Move the survey point to one of the reference points in the dwg file.
    6 use "acquire coordinates" and select the dwg file.
    7 pin the survey point
    8 locate the project point on the building for the setout and pin it.

    This also set my true north orientation correctly.
    Still can't work out why it wouldn't work with specifying coordinates at a point though.
    Andrew Harp
    BIM Manager GHD
    If you are not willing to learn, no one can help you.
    If you are determined to learn, no one can stop you.

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