Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Help inserting orthophotos into autocad for digitizing

Help inserting orthophotos into autocad for digitizing

Help inserting orthophotos into autocad for digitizing

I am trying to insert a digital orthophoto (.tif) into AutoCAD 2000, but the image is not at the proper scale. I do have a world file (.tfw) but I'm not sure what the proper use of this file is. Any help would be appreciated...

RE: Help inserting orthophotos into autocad for digitizing

This is quite a tricky operation as it depends what you want to use the photo for. I can't give you specifics but the basic concept is to match your world co-ordinate file to the orthophoto. I would imagine it will also involve a user co-ordinate system operation in ACAD. You will need quite a number of known points to get a proper match with scaling etc as there are always distortionsin such photos. Litterature on Photogrammetry will help to illustrate this problem. I know there are various software packages wchich will do what you want (a lot of Geographic Information Packages will offer this) BUT BE CAREFUL ABOUT DISTORTIONS. This is a specialised field best left to Photogrammetrists to sort out. I therefore feel it would be useful to cantact your nearest survey / geomatics teaching institution for specific help.

RE: Help inserting orthophotos into autocad for digitizing

generally after producing orthophotos we register them to their real coordinates, and you can see that information in the begining of the TIFF file. if you view it as ASCII (header information). if you can't see those real coordinates in the header information that means the orthophoto wasn't registered. in that case i am sorry for your orthophoto. you need to contact with your producer. first you should check those coordinates.


if you have the corner coordinates of orthophoto you can register it by yourself.

good luck...

RE: Help inserting orthophotos into autocad for digitizing

If you are going to be doing a lot of this now and in the future I would recommend purchasing CadOverlay form Autodesk. It will not only automate the insertions of Orthos with the world files it will be of great help with the digitizing. If not you can look at the world files to figure out the correct insertion point and scale for each Ortho.


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close