AutoCAD Civil 3D General

Valued Contributor
Posts: 71
Registered: ‎12-16-2009
Message 1 of 5 (286 Views)
Accepted Solution

DTM & ALG Files

286 Views, 4 Replies
02-03-2014 11:31 AM

We have a job coming up where our client plans on sending us  .dtm  & .alg files to create a surface model using C3D 2013.

I am not sure what these files are but I  believe they maybe Micro Station or Inroad files.

My question is how do you use these in C3D 2013? Do I convert or import them , and if so how?

Or is there a better formant  more  compatible with C3D, that I should request from our clients?


                                               Thank You

                                                    Steve Swanson


*Expert Elite*
Posts: 1,747
Registered: ‎09-05-2006
Message 2 of 5 (275 Views)

Re: DTM & ALG Files

02-03-2014 12:35 PM in reply to: sswanson

Without knowing anything about the .alg file and the dtm file is probably different as well.  Hopefully they can send you a LandXML file (for the surface) which should be "non-denominational" and have the surface already built.





*Expert Elite*
Posts: 486
Registered: ‎01-14-2009
Message 3 of 5 (261 Views)

Re: DTM & ALG Files

02-03-2014 02:43 PM in reply to: sswanson
Steve .alg files belong to InRoads. That application has the ability to export to LandXML. As Bill said, if they export, you can import the surface as they intended it to be, keeping the liability (responsibility for it's creation) with them. Here's a good workflow provided by Wisconsin DOT. Although the workflow isn't for surfaces, I've received them in the past.
Lisa Pohlmeyer

C3D 2012 SP4, evaluating C3D 2015
Please use "Accept as Solution" if this solved your issue.
*Expert Elite*
Posts: 2,197
Registered: ‎09-04-2006
Message 4 of 5 (252 Views)

Re: DTM & ALG Files

02-03-2014 05:05 PM in reply to: sswanson
The DTM file is an Inroads surface model file. Unless there is a utility available somewhere you won't be able to use it as it is a proprietary format.

The ALG file is an Inroads alignment database.
Neil Wilson (a.k.a. neilw)
Infrastructure Suite/C3D 2013, LDT 2004, Power Civil v8i SS1
WIN 7 64 PRO
HP Pavillion h8xt, i7 2600, 12 GB
RADEON 6450, 1 GB
Valued Contributor
Posts: 71
Registered: ‎12-16-2009
Message 5 of 5 (226 Views)


02-05-2014 08:44 AM in reply to: Neilw
Thanks to all of you for your help. Our client will be sending us a
LandXML file.

Thanks again

Steve Swanson

You are not logged in.

Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register

Are you familiar with the Autodesk Expert Elites? The Expert Elite program is made up of customers that help other customers by sharing knowledge and exemplifying an engaging style of collaboration. To learn more, please visit our Expert Elite website.

Need installation help?

Start with some of our most frequented solutions to get help installing your software.

Ask the Community

Civil 3D Exchange Apps

Created by the community for the community, Autodesk Exchange Apps for AutoCAD Civil 3D helps you achieve greater speed, accuracy, and automation from concept to manufacturing.

Connect with Civil 3D