AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Member
jprezkuta
Posts: 5
Registered: ‎09-21-2012
Message 1 of 12 (609 Views)

Best Fit Alignment Problems C3D 2013

609 Views, 11 Replies
09-21-2012 10:14 AM

I am trying to create a best fit alignment from parallel linear sets of COGO points. When I run the command, about halfway through the data set the alignment suddenly curves out of away from the COGO points. I tried doing a best fit individually on each side, one side works fine, the other sets station zero about a quarter of the way into the points and runs it back toward the start, leaving out 3/4 of the points. Any ideas on what is happening here?

*Expert Elite*
BrianHailey
Posts: 2,815
Registered: ‎04-27-2005
Message 2 of 12 (596 Views)

Re: Best Fit Alignment Problems C3D 2013

09-21-2012 01:13 PM in reply to: jprezkuta

Can you post the points?

Brian Hailey
CAD-1.com
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Member
jprezkuta
Posts: 5
Registered: ‎09-21-2012
Message 3 of 12 (559 Views)

Re: Best Fit Alignment Problems C3D 2013

09-24-2012 06:06 AM in reply to: BrianHailey

Unfortunately, I am not able to post the points at this time. I converted the points from AECC to COGO, could this have something to do with it?

Member
jprezkuta
Posts: 5
Registered: ‎09-21-2012
Message 4 of 12 (540 Views)

Re: Best Fit Alignment Problems C3D 2013

09-24-2012 10:32 AM in reply to: jprezkuta

I figured it out. I exported the points into a csv format and sorted the file by northing and then by easting. That seemed to fix it, before the northings and eastings were all jumbled in no particular order.

Active Contributor
Razzmatazz
Posts: 41
Registered: ‎10-01-2013
Message 5 of 12 (328 Views)

Re: Best Fit Alignment Problems C3D 2013

10-08-2013 07:47 AM in reply to: jprezkuta

I'm also trying to create a best fit alignment from one set of COGO points for a road centreline. I've imported the points from a space delimited txt file and the points are neatly arranged the way the centreline should be but when i try to create the best fit alignment, it shoots away from the points and leaves most of them............how did u manage to create a best fit alignment which follows the single linear set of points all the way to the end?    Your assiatance will be highly appreciated..................I have attached the file, which is in PNE format, space delimited.

 

Thanks in advance

Employee
peterfunkautodesk
Posts: 718
Registered: ‎08-25-2009
Message 6 of 12 (314 Views)

Re: Best Fit Alignment Problems C3D 2013

10-08-2013 10:01 AM in reply to: Razzmatazz

I can get a nice best fit if I don't use the last 4 points. I don't know why, but that's what I'm finding. It looks like those last 4 points are in a line...

 

Regards,

 

Peter Funk

Autodesk, Inc.



Peter Funk
Autodesk, Inc.

Active Contributor
Razzmatazz
Posts: 41
Registered: ‎10-01-2013
Message 7 of 12 (282 Views)

Re: Best Fit Alignment Problems C3D 2013

10-11-2013 03:48 AM in reply to: peterfunkautodesk

All i'm getting is a straight line that's not following the points arrangent at all........when u say a nice best fit, do you mean that your alignment follows the points perfectly all the way apart from the last four points? Does it take the shape created by the arrangement of the points? because mine is just a straight line that only follows the first few points.........could there be something i'm missing..

*Expert Elite*
Jeff_M
Posts: 4,387
Registered: ‎07-22-2003
Message 8 of 12 (271 Views)

Re: Best Fit Alignment Problems C3D 2013

10-11-2013 06:23 AM in reply to: Razzmatazz

Odd, in C3D 2012 I get a nice best fit alignment. In C3D 2013 I get an alignment with the following properties:


1 Line Not Constrained (Fixed) Two points 12316.120' N2° 06' 11"E 0+00.00' 123+16.12' 
2 Curve Constrained on Both Sides (Free) Radius 2.114' 0.676' 123+16.12' 123+18.23' 179.2138 (d) 1.352' 
3 Line Not Constrained (Fixed) Two points 0.001' S2° 53' 22"W 123+18.23' 123+18.24' 

 

I did have to remove 3 of the last 4 points.

Jeff_M, also a frequent Swamper
*Expert Elite*
Jeff_M
Posts: 4,387
Registered: ‎07-22-2003
Message 9 of 12 (264 Views)

Re: Best Fit Alignment Problems C3D 2013

10-11-2013 06:38 AM in reply to: Jeff_M

I get the same, incorrect, results in C3D 2014 SP1. I tried with & without the spiral option.

 

10-11-2013 6-36-58 AM.png

Jeff_M, also a frequent Swamper
Employee
peterfunkautodesk
Posts: 718
Registered: ‎08-25-2009
Message 10 of 12 (258 Views)

Re: Best Fit Alignment Problems C3D 2013

10-11-2013 06:50 AM in reply to: Jeff_M

I'm getting the same results in 2014 unless I drop the last 3 or 4 points and then I get the better results

 

Peter Funk

Autodesk, Inc.



Peter Funk
Autodesk, Inc.

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