AutoCAD Map 3D General Discussion

AutoCAD Map 3D General Discussion

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Active Member
SLColorado
Posts: 6
Registered: ‎03-20-2009
Message 1 of 4 (185 Views)

2009 Map3D Projection Issues

185 Views, 3 Replies
10-16-2009 11:50 AM
I am have a discrepancy in coordinates for the same point using Map 3D. Using a program Blue Marble I convert my PLSS SPC coordinate into a local projection, then import into a C3D drawing which is also defined with the local projection. I then link using FDO to an SDE layer that has those same coordinates in SPC and bring them into the same C3D drawing. At this point I notice an error of anywhere from 0.3' to 0.8'.

Any ideas where this problem may be? The issue appears to be in Map 3D when it translates the SDE layer's SPCoordniates to the local projection. Edited by: SLColorado on Oct 16, 2009 6:50 PM
*wfb
Message 2 of 4 (185 Views)

Re: 2009 Map3D Projection Issues

10-16-2009 01:15 PM in reply to: SLColorado
First thing:
Verify that you don't have a conflict between "FEETS". There is "US Survey
Foot" and "International Foot".

Bill

wrote in message news:6273178@discussion.autodesk.com...
I am have a discrepancy in coordinates for the same point using Map 3D.
Using a program Blue Marble I convert my PLSS SPC coordinate into a local
projection, then import into a C3D drawing which is also defined with the
local projection. I then link using FDO to an SDE layer that has those same
coordinates in SPC and bring them into the same C3D drawing. At this point I
notice an error of anywhere from 0.3' to 0.8'.

Any ideas where this problem may be? The issue appears to be in Map 3D when
it translates the SDE layer's SPCoordniates to the local projection.

Edited by: SLColorado on Oct 16, 2009 6:50 PM
Active Member
SLColorado
Posts: 6
Registered: ‎03-20-2009
Message 3 of 4 (185 Views)

Re: 2009 Map3D Projection Issues

10-21-2009 12:35 PM in reply to: SLColorado
I am working in the correct feet for both. I have since found that the error is almost entirely in the Northings, and progresses larger the further northeast you go from the false origin.
*fieldguy
Message 4 of 4 (185 Views)

Re: 2009 Map3D Projection Issues

10-22-2009 09:42 AM in reply to: SLColorado
This could be a scale factor issue if the error gets larger as the coords
get larger. Are all significant digits the same?

wrote in message news:6273178@discussion.autodesk.com...
I am have a discrepancy in coordinates for the same point using Map 3D.
Using a program Blue Marble I convert my PLSS SPC coordinate into a local
projection, then import into a C3D drawing which is also defined with the
local projection. I then link using FDO to an SDE layer that has those same
coordinates in SPC and bring them into the same C3D drawing. At this point I
notice an error of anywhere from 0.3' to 0.8'.

Any ideas where this problem may be? The issue appears to be in Map 3D when
it translates the SDE layer's SPCoordniates to the local projection.

Edited by: SLColorado on Oct 16, 2009 6:50 PM
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