Beginner Problem Projecting CAD data

Question

Hi Everyone!

I apologize in advance; I am new to GIS.

I have a CAD drawing of an archaeological site that was made using assumed coordinates using total station data.  Therefore, there is only one point on the map, set at a northing of 500m and an easting of 500m, that I actually know where is corresponds to in the real world (I have the real world location in UTM coordinates of the single point).  I need to project this onto a topographic basemap of the area.    I have tried using the georeferencing tool with little success.  Do I georeference it before turning it into a shapefile? How do I even georeference this with just one point?  Any advice as to how to do this would be greatly appreciated.

Thank you very much for your time!  I have been banging my head against the wall for a couple days now....

NeilAyres · Answer

Its just simple trig.

Make a sketch.

Offset from grid = 6.5deg (in this example, to the right of north).

If adding an offset of 100...

newX = KnownX + Sin(6.5) * 100

newY = KnownY + Cos(6.5) * 100

NeilAyres · Answer

If it is actual paper you can just use a set square and the scale bar to offset 3 other cords from your 1 known point.

A similar procedure applies if the data is digital. You would have to figure out (by examining the scalebar in the drawing) if the digital units are actual real world units or some fraction of them.

AletheiaBouknight · Answer

Thank you very much for your response!  The links have been very helpful.  Unfortunately, resurveying the data is not an option, as it is an archaeology site located in the Southwest that has since be reburied.  Because of the fact that it is an archaeology site, there are few/no visible geographic references either.  I think I may have to continue without actually placing it in the "real world."