New Topics Added

I added two new topics:

  • XIV. Simultaneous Equations
  • XV. Least Squares Lite

The former topic covers computational tools used for the latter. A self-study section is included.

Least Squares Lite is a general introduction ("Lite")  to data adjustments based on random errors. I'm will be adding more examples and a self study section over the next month or so.

Both topics include a lot of equations and I revised the material quite a bit before posting so I would expect that there are some typos. Please let me know if you find any or if something isn't clear. Any feedback is welcome, without it I don't know how effective or confusing the material is.

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Coordinate Software

I've posted a few coordinate manipulation software tools.

Transformation:

TransPack is a Windows program which computes and performs 2D Conformal, Affine, and Projective transformations using least squares. It is in support of the material in IX.COGO Chapter Chapter J. Coordinate Transformation. The software is described and available for download at Support Files | Coordinate Transformations.

Conversion:Two coordinate conversion tools specifically for Wisconsin coordinate systems.

One is an Excel workbook for Direct and Inverse point conversions.

The second is a Windows program which performs Direct, Inverse and Grid-to-Grid conversions interactively or for point files.

Both are described and available for download at Software | Coordinate Conversion.

03 Mar 2021

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Material Organization

Subject matter is arranged by Topic in the Main Menu. Selecting a Topic lists its Chapters which in turn are further divided into Sections.

Content is evolving and will be added as time permits. This is a one-man show so please let me know of grammar errors, typos, etc. Suggestions for other Topics or additions to existing ones are always welcome.

A site account is not necessary to access or use any of the Open Access material. However, having an account will allow a user to leave comments and feedback in each topic area (comments can be viewed without an account). If you would rather email me than create an account, I can be reached at This email address is being protected from spambots. You need JavaScript enabled to view it..

Terms of Use

By accessing this material you agree to these terms of its use:

  • Copyright of all non-attributed material on this site is retained by me, Jerry Mahun.
  • You are granted permission to use any of this material (text and/or images) in support of surveying education.
  • Material used shall be appropriately credited.

Because the material is freely provided and intended solely for educational purposes, there is no warranty as to its applicability or appropriateness of use. The author does not assume any liability for damages resulting from its use.

updated 27 Aug 2018

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