Coordinates Wrong location

[talayeh.hamidya]

Hi, 

I have a survey with XY values for the corners of the property I'm working on. The CAD file's origin is random and thus I'm working with it only to rotate to Project North and scale it to locate the corners of the property. Then I specified a coordinate at a point of the bottom left corner of the property with previously known XY coordinate (multiplied by a 1000). When I annotate other corners of the property the numbers don't correspond with survey points. (the outline with RED arrow)

If I use the survey point, assign known XY coordinates from the survey and connect the points the result is the same property shape but mirrored, slightly rotated (5.2 degrees) and scaled (x2.5) ! (the outline with BLUE arrow) 

Does anyone have a clue what may have happened and how to fix the situation?!

Thanks, 

[SteveKStafford]

Three weeks late but most likely the scaling you mention is to blame. You need to match the "scale" intended in the DWG when linking the file to Revit correctly. I always make sure I understand what the base unit of the survey file is before linking. Surveys are usually aligned with North so the orientation is correct for the site so it will need to be Rotated in Revit to define a Project North. Once you've rotated the survey as needed then using the Acquire Coordinate tool will set the Revit Survey Coordinate System to match the World Coordinate System of the selected DWG file. If you use a Spot Coordinate annotation (assigned to Survey Point and the same units as the DWG) you should find the corners of the property boundary lines match in both Revit and the DWG.

If the DWG is using US Survey Feet then older versions of Revit don't know what that is and that unit definition is very slightly different form the other survey unit in the DWG.