TransPack is a Windows program I wrote which performs Conformal, Affine, and Projective coordinate transformations.

  • A Conformal is a four parameter transformation requiring at least two control points known in the From and To systems.
  • An Affine uses six parameters and requires at least three control points
  • A Projective uses eight parameters and requires at least four control points

If more control points are provided than needed, TransPack will determine transformation coefficients using least squares.

A separate point file can be transformed after coefficients are determined.

TransPack is a 64-bit program and compatible with Windows 7-10.

TransPack is provided as freeware for educational purposes with no warranty as to its use or applicability. It's a simple program to use but because it's not a commercial package, it doesn't trap file input/output errors. Pay attention to the file format information in the manual.

TransPack is a work-in-progress with a few more bells and whistles to be added. Consider the current version an advanced beta. I'm hoping to have a "final" version completed by sometime in April 2021.

Download and run TransPack_Setup.exe to install the software and manual. The manual can be downloaded separately.

Please send comments/feedback to me at This email address is being protected from spambots. You need JavaScript enabled to view it..

17 Mar 2021


Comments (0)

There are no comments posted here yet