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Matching Architects Drawing to CAD Co ordinates

Anonymous

Matching Architects Drawing to CAD Co ordinates

Anonymous
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New to Cad 2018 so apologies if this is a stupid question

 

I've been sent through a building drawing, it has set co- ordinates which are Global. 

 

They do not match the coordinates on CAD, normally they do and there are no problems. I Have tried using UCS and align but think I must be missing a step.

 

any help would be very much appreciated.

 

 

 

 

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Respuestas (4)

john.vellek
Alumni
Alumni

Hi @Anonymous,

 

I see that you are visiting as a new member to the AutoCAD forum. Welcome to the Autodesk Community!

 

 I am not sure that I really understand your question so please give me some more detail.  Is the drawing oriented in a different direction? Are you Xrefing the file in and it does't come in aligned to your existing geometry?

 

Can you share the drawing and the one you are trying make it coordinate with so i can better idea of what you are facing?

 

 

Please select the Accept as Solution button if my post solves your issue or answers your question.


John Vellek


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Anonymous
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Hi John

Thank you for your reply 

What I've been given is a .dwg of a whole site drawing, I will need to download this onto a total station.

When I try and use UCS to Change to the coordinate given it doesn't show the correct value, 

I put in the desired coordinate separate with a comma and press enter but nothing is happening.

its been a while since I've done this so I'm sure i'm missing a step. 

could it also be the scale is different?

thanks again for your help 

Kyle 

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caddie99
Advocate
Advocate
I have been surveying for 40 years using autocad for 28 DO NOT stake from architects plans directly import the line work then verify then you can stake
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ChicagoLooper
Mentor
Mentor
Solución aceptada

Global coordinates, is not the terminology used by Cad. You probably mean World Coordinates. Your UCS icon should have a tiny square box where the vertical and horizontal lines meet. If there's no box, and your UCS doesn't, it means the UCS is not currently in World Coordinates. I speculate the drawing has been rotated about 18.5-degrees clockwise. I know this by looking at the VIEW CUBE in the upper right.

 

If the building (or property boundary) is a rectangle, then it was rotated to make two walls run left-to-right and the two other walls run straight up-and-down. Without rotation, the building's exterior walls wouldn't be parallel to the sheet edges and everyone would get a sore neck reading the drawing--and we don't want that.  If you were to make both true north and the view cube point straight up then both your x- and y-axes would be angled instead of horizontal and vertical. 

 

 To investigate, type "+UCSMAN" (without the quotes) on command line, then 0 enter. In the next dialog, on the Named UCSs tab, you'll see World and a secondary UCS if the original author decided to name it. If he didn't bother, it will show UNNAMED. 

 

Just because the author indicated northings and eastings and decided to rotate the view, doesn't necessarily mean his drawing is geo-referenced. He still needs to tie to a 'Known Coordinate System' such as State Plane mucha-ma-call-it, US-ft or UTM Zone ??, NAD83, meters. (I doubt, though, otherwise the view cube wouldn't be rotated.) To me, looks like a 'local' coordinate system, commonly referred to as a 'site specific' CS.

 

 

Chicagolooper

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