topic Existing and Proposed Surface tie in points do not match in InfraWorks Forum https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13789190#M25006 <P>I have imported a Civil 3d model .IMX model into Infraworks and for some reason the surface &amp; corridor do not match. What causes this? see Image below. Everything looks good in my Civil 3d model. I am using IW 2004.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PaulGrafPZAZ7_0-1756500993321.png" style="width: 400px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1566024i6AB3BF65ACCB0486/image-size/medium?v=v2&amp;px=400" role="button" title="PaulGrafPZAZ7_0-1756500993321.png" alt="PaulGrafPZAZ7_0-1756500993321.png" /></span></P><P>&nbsp;</P> Fri, 29 Aug 2025 20:58:00 GMT Paul.GrafPZAZ7 2025-08-29T20:58:00Z Existing and Proposed Surface tie in points do not match https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13789190#M25006 <P>I have imported a Civil 3d model .IMX model into Infraworks and for some reason the surface &amp; corridor do not match. What causes this? see Image below. Everything looks good in my Civil 3d model. I am using IW 2004.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PaulGrafPZAZ7_0-1756500993321.png" style="width: 400px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1566024i6AB3BF65ACCB0486/image-size/medium?v=v2&amp;px=400" role="button" title="PaulGrafPZAZ7_0-1756500993321.png" alt="PaulGrafPZAZ7_0-1756500993321.png" /></span></P><P>&nbsp;</P> Fri, 29 Aug 2025 20:58:00 GMT https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13789190#M25006 Paul.GrafPZAZ7 2025-08-29T20:58:00Z Re: Existing and Proposed Surface tie in points do not match https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13792812#M25007 <P>Did you use the existing surface from InfraWorks? Because the InfraWorks existing surface is way different in elevation. In other words, it's not very accurate.</P> Tue, 02 Sep 2025 12:48:55 GMT https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13792812#M25007 Todd_Rogers 2025-09-02T12:48:55Z Re: Existing and Proposed Surface tie in points do not match https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13794702#M25009 <P>No, I used a lidar surface that was exported out of Civil 3d.</P> Wed, 03 Sep 2025 13:23:45 GMT https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13794702#M25009 Paul.GrafPZAZ7 2025-09-03T13:23:45Z Re: Existing and Proposed Surface tie in points do not match https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13794730#M25010 <P>In the Surface Layers, turn off the AIW surface, and make sure you have your proposed above the lidar surface and both are turned on.</P> Wed, 03 Sep 2025 13:32:25 GMT https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13794730#M25010 Todd_Rogers 2025-09-03T13:32:25Z Re: Existing and Proposed Surface tie in points do not match https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13796693#M25014 <P>I did not start this project with model builder. I started over, brought in all my data and it seems to be good now. Thank you for all your help.&nbsp;</P> Thu, 04 Sep 2025 13:19:01 GMT https://forums.autodesk.com/t5/infraworks-forum/existing-and-proposed-surface-tie-in-points-do-not-match/m-p/13796693#M25014 Paul.GrafPZAZ7 2025-09-04T13:19:01Z