Brief description:
MicroStation V8i SS2 and a DGN with local coordinates. xy aligned to buildings, GO close to buildings
Fine.
Fine. All input and output now is in real worls coordinats, easting and northing. If I activate "report ACS Position" I can see longitude and latitude. All at the correct positions and true north. Fine.
Now the problem:
If I want to go back to my original local coo system, it doesnt reproject.
But nothing changes anymore. I'M stuck with the real world coordionates. The elements dont rotate back, they are not moved back to the local coordinates.
A bug? WAD? Another way to go back?
Thanks, Bigean
anybody? Meanwhile I mastered to assign 3 locations with 2 different GCS and georeference them. Wonderful.
Just the questions above are open
and another one: How can I store the definition of local "structure centric" coo systems in MicroStation? I know there's no function inside MicroStation, but how about editing a data file in the workspace?
Thanks Bigean
One way to do this is to make a design file (say StructureGCS.dgn) with your "structure centric" GCS in it. When you want to put that GCS into another design file, attach StructureGCS.dgn coincidentally, and then when you assign a GCS, use the "From Reference" option (just to the right of the "From Placemarks" icon.)
HTH
Barry Bentley
Answer Verified By: Bigean
Unknown said:One way to do this is to make a design file (say StructureGCS.dgn) with your "structure centric" GCS in it. When you want to put that GCS into another design file, attach StructureGCS.dgn coincidentally, and then when you assign a GCS, use the "From Reference" option (just to the right of the "From Placemarks" icon.)
Hi Barry,
yes, that is the solution.
1. Before transforming a placemarked DGN into a world coo system, save that DGN as a future template for the local coo system
2. Going back from world to local coordinates requires to attach that template DGN as reference, method coincident, and then "set GCS from reference", choose "reproject yes", which transformes back.
In step 2 I also tried to "import from DGN" method, but that results into a bad accuracy for the backtransform. One should not use that method.
Thanks, Barry, I was able to understand why it didn't work and how to proceed another way. Great Knowledge that you have, I'm impressed.
Bigean
Oh, and I think it is a good idea to put that hint into help, wiki and tutorials. And the hint to backup the original file. Right?
;)