Transformation grid

[minerdetails]

I have a client who is working on the edge of a MGA coordinate zone - as they are near the edge of the zone their scale factor is large and needs to be factored in to all setouts (it makes 50mm of difference over 100 metres.)

their previous solution has been to work day to day at 1 to 1 scale and then xreference this back into a MGA projection by using a scale factor around a single point false origin.

As they are moving away from this false origin - the scale factor is changing slightly.

Is it possible to create a user grid at 1 to 1 for the day to day use and then query this into a MGA drawing. via ADEQUERY to bring it back to MGA ?

[lim.wendy · Accepted solution]

Hi!

May I know which version of Map3D are you using?
You can create a ‘user defined coordinate system’ based on 
the zone you are working – and then set the scale reduction factor to 1. 

When ADE-querying such a DWG in, the coordinates are 
re-projected into the target coordinate system that the host-DWG is using.