RevitCity.com Logo

Home  |  Forums  |  Downloads  |  Gallery  |  News & Articles  |  Resources  |  Jobs  |  FAQ  |  SearchSearch  |  Join  |  LoginLogin

Welcome !

277 Users Online (117 Members): Show Users Online - Most ever was 626 - Mon, Jan 12, 2015 at 2:00:17 PM

 

Forums

Forums >> Revit Building >> Technical Support >> matching contour lines from civil CAD when creating Topography (2019)

Search this ThreadSearch this Thread | Page 1 of 1 |

Fri, Dec 4, 2020 at 2:29:49 PM | matching contour lines from civil CAD when creating Topography (2019)

#1

ledgewood33


active

Joined: Thu, Jan 28, 2010
34 Posts
No Rating


 

is there a way or method to match contour lines from civil CAD when creating Topography? after creating the topography from the the civil CAD it seems that most of the time the contour lines do not match the original civil survey from the CAD that I imported to revit. i overlay the civil CAD and the contours that seem to not line up tend to be the swale's. therefore, i am going back into the edit mode of the topo to place points so that the contours in the revit topography match the civil CAD survey.

any suggestions?

 


This user is offline

 

Fri, Dec 4, 2020 at 8:09:46 PM | matching contour lines from civil CAD when creating Topography (2019)

#2

WWHub


site moderator|||

Joined: Tue, May 16, 2006
13079 Posts
3.5 Stars: 364 Votes


I would have thought you may have seen my posts on this subject before but here it is again.  If you started out hand drafting, you would know this.

Contour lines should never be thought of as being precise.  If you want precise, then use spot elevations that have been produced from a survy.  Contour lines are ONLY a visual representation of the topography.

When hand drafting, the surveyor typically takes spot elevations on a grid he lays out along with special, unique spots that are identified off the grid.  When the draftsman creats a contour line, he draws his line at a VISUAL point that works with those spots.  So say he is creating contours at 5' intervals and at quadrant 10/10 the spot elev is 101.95 and at quadrant 10/20 (obviously 10' grid) the spot elevation is 106.43.  Well, the only line that goes between those two spots is 105 so he interpolates and draws that somewhere nearer the 10/20 grid.

Hand drafting is all visual ... you don't do any math.  The computer does the same thing except it uses math and follows its own program (not all are the same).  But it does not connect these grid intersections with straight lines.  It uses a polyline that is flexed to create gentle curves.

TThe final word:  DON'T GET HUNG UP ON ONE TOPO NOT EXACTLY MATCHING ANOTHER that was created elsewhere.  Revit's topo's are good quality and they reflect the imported spot elevation data.



Edited on: Fri, Dec 4, 2020 at 2:11:49 PM

This user is offline

 

Search this ThreadSearch this Thread | Page 1 of 1 |



Similar Threads

Thread/Thread Starter

Forum

Last Post

Replies

Revit 2017 - Topography contour lines visibility

Revit Building >> Technical Support

Thu, Apr 12, 2018 at 5:32:45 PM

7

A Whole Lot of TOPOGRAPHY & CONTOUR LINE questions...

Revit Building >> Technical Support

Tue, Nov 22, 2011 at 12:07:37 PM

9

Possible to place contour lines to toposurface instead of points?

Revit Building >> Technical Support

Fri, Jun 1, 2018 at 7:57:52 PM

7

topography not being generated at the correct level

Revit Building >> Technical Support

Thu, Oct 12, 2017 at 1:01:15 PM

10

Visibilty of Contour Lines

Revit Building >> Technical Support

Mon, Jun 21, 2010 at 2:32:46 PM

2

Site Stats

Members:

1592589

Objects:

21909

Forum Posts:

151530

Job Listings:

3

Sponsored Ads

Home | Forums | Downloads | Gallery | News & Articles | Resources | Jobs | Search | Advertise | About RevitCity.com | Link To Us | Site Map | Member List | Firm List | Contact Us

Copyright 2003-2010 Pierced Media LC, a design company. All Rights Reserved.

Page generation time: 1.5414

Login

User Name:

Password:

Remember Me  

Forgot Password?

Search Forums

Advanced Search

Search Forums

Advanced Search


Clear Highlights


Clear Highlights