Mismatching Coordinates

[Anonymous]

Hi. I have been struggling with a coordinates problem for over a week and I am getting nowhere. I would be so grateful for a fresh pair of eyes to look over it. Thank you in advance.

I am trying to line up my project to a topographic  AutoCAD plan I received from my architect. I just cant seem to get the coordinates to line up. The metric distances between points seem to be the same (and correct to the physical site) but the coordinates seem wildly different. I want to match the two plans so I can import the topographic points to create the surface. 

I am including my project files with 2 points annotated in Revit (the project base point and a reference point on the autoCAD topographic plan).  The project base point matches the same value in the autoCAD drawing (Point 93 which is N: 4285332.9 and E: 248201.2) The other reference point is different. In Revit is shows as N: 4284973, E: 229574 and in the AutoCAD plan it shows as N: 4285332.5631, E: 248182.5369. The distance between the 2 points is approximately same in both AutoCAD and Revit (about 18.5m). 

I have extracted the topographic points into csv file from the autoCAD. When I import to Revit it is not matching up (too compressed) and not at same height. 

I am just struggling to see how the distance can be the same but the coordinates are not. I would be really grateful if someone could give me an idea (or even better a solution) to my problem. Thank you so much.

[barthbradley]

I am not having any issues -- at least, I don't think I am. Check out my Revit File and see for yourself. 

Are you positive that you are selecting the correct units at the prompts?  

[FAIR59]

the numbers don't match, because the dwg is not positioned correctly. Set the view to True North and you'll see that the north of the dwg isn.t pointing to the top.

[barthbradley]

Not following your point, @FAIR59.  Can you elaborate please?

[FAIR59]

You are never to have the same coordinates for multiple points if DWG-North and Revit-North are different.

Second mistake in original file: the numbers from the DWG are in meters, the Revit project-units are in millimeters, ==> 248201.2 m translates to 248201200 mm in the Revit Shared Coordinate system.

[barthbradley]

I see where you are coming from, @FAIR59 . Frankly, the resulting Toposurface doesn't look correct to me in relationship to this Plat anyways. If it were my responsibility, I'd be consulting directly with the authors of this data, and not some strangers on a forum.   😉

[barthbradley]

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@Anonymous wrote:

I have extracted the topographic points into csv file from the autoCAD.

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@Anonymous: Can you post the AutoCAD file you extracted the point data from?