AutoCAD Map 3D General Discussion

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kevin.barnett
Posts: 381
Registered: ‎08-13-2007
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Layout Tools - Reference System Template for South Africa Lo

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06-04-2013 10:14 PM

Greetings,

I now know how to create a Reference System Template.

It looks like the template XML does not provide expressions or any method to apply math to the coordinate values. Or, maybe I missed something?

 

Here is the problem:

Land survey Lo coordinate systems in South Africa are opposite to the northern hemisphere.

Like this:

RSALO.png

 

Example coordinate:: Y75300 , X2800000

 

This system is opposite to AutoCAD's WCS.

The leading Autodesk dealerships and many consulting firms solve this by changing the sign of the coordinates, like this:

AutoCAD WCS: X-75300 , Y-2800000

Then, expressions are used in Civil 3D to change the signs for coordinate tables.

Fortunately, C3D provides additional transormation of the coordinate systems, so a 180 degree rotation is applied to the coordinate systems provided by Map.

 

Back to the point...

It looks like there is just no way a reference system template can be made to work with this solution.

Correct? Not until math expressions are included in the reference system template to change the signs of the values.

 

I am hoping that I am incorrect, please let me know, I would like to use the Reference System.

 

Thanks for reading,

Kevin.

 

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