Forums >> Revit Building >> Technical Support >> revit 2011 Coordinate points issue

amandaholly

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Joined: Sun, Sep 21, 2008
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Hi,  I have a revit model I want to match up with an existing site plan in real world coordintates.  Even with the 20 mile radius update in 2011 I cannot inset the cadd plan by origin to origin so instead I have tried to center to center.  I tried manually changing the revit model to match the cadd plan by using specify coordinates at a point.  Even thouh the points read correctly in revit when I export by either project or shared coordinates they do not match.  Does anyone have an idea fro a fix in the or are people just S.O.L. if their project happens to be far enough from the origin and they want to match up civil and architectural?

Thanks in advance - any advice is much appricated!

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Typhoon

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Joined: Tue, May 22, 2007
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"Even with the 20 mile radius update in 2011 I cannot inset the cadd plan by origin to origin so instead I have tried to center to center" - Try this, open your CAD file, then create a "Wblock" only with what you need then insert that "Wblock" into Revit...

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I Hope and I Wish to LEARN  more, and more, and more.... REVIT

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brettgoodchild

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Joined: Sat, Feb 4, 2006
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If you want to match the coordinate system from CAD to your Revit model, you will want to learn about shared coordinates and get comfortable with the idea and concept.

As for the process of aligning the two files, it is really quite simple and the one part I really would emphasize here would be to use a base file and not the actual civil file.

By this I mean start a blank CAD drawing...clean of everything. Xref the site file into the blank file at 0,0,0.

Then, link that base file into Revit...I typically use center to center.

This will not only get you around the 20 mile limit, but will help avoid passing any coordinate changes back to the civil file.

Revit will actually reference the coordinates from the xref so you should be fine.

The attached images show the reported coordinates from one of our projects and as you can see...the E/W coordinates are about 2,247 miles and the N/S are about 1,315 miles...well beyond the Revit restriction.

But one more time...get comfortable with shared coordinates.

HTH

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tecnicheparametriche

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Thanks for the advice!

I tried the XREF option, but can't see the file. It says it might be not visible for some reason... but it does import.Can't make it show! Any ideas? tried either manual or automatic (center) ... never shown.The not referenced file actually imports fine center to centerbut if I acquire coordinates the surey point moves only at the center of the drawing(like it it was imported center to center). probably because of the 20 miles limit.My drawing is actually located approx.

2.459.866 meters East4.523.624 meters WestMy solution -for now- was to draw a line in ACAD,round the coordinates of the points ...sign them,then import center to center the nox-xref plan andassign manually the coordinates to the point.I got a rounding error, probably because project is .00 in meterswhile ACAD was .0000.The weird thing is that coordinates can be specified with .0000when I am prompted. But then spot coordinate tags only show .00

...we tried importing back the dwg plan exported  from revitinto acad and the tolerance doesn't seem to matter(yeah...seems. how can I test that?)

thanks in advance for any help,I hope this can help somebody as well

Stefano 

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amandaholly

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Joined: Sun, Sep 21, 2008
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Thanks guys, 

I did fix it with shared coordinates. 

I had to insert the survey file center to center, specify a coordinate within revit and then let that file drive the rest (all my other revit links). 

Seems to work well. 

 Thanks!

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