Geodesy and Geophysics
Site of James R. Clynch
I am placing on this site a large amount of material generated over the
a scientist and teacher. The material is in the areas of GPS,
Geodesy, and Geophysics (mainly about radio propagation along ground to
I have edited and uploaded about 30 short technical notes.
are divided into sections: Geodesy, Maps, GPS, Atmosphere, Time,
Mathematics, and General. Little mathematics is needed to
understand most topics. A few require vectors and calculus.
technical notes are yet to be uploaded.
I have provided about 500 modules in Fortran ,
which was the major language I used in scientific studies.
this may be out of date, it may serve as template for some. The
majority of the geodesy modules, and some others were converted to
Matlab. This language needs an runtime program that is
but usually discounted for educational institutions. I have
used in an online interactive module.
provided about 1000 images that might be useful. These are both
technical images, and utility ones (arrows, backgrounds etc.)
They are available two ways. There are a set of zip files
cover different technical areas. In addition there is a
set - 50 images per page -where individual images can be view.
This is likely best used to decide what zip collection are
desired. The zips are all 1 MByte or less.
This is a section where I put short - maybe sometimes longer -
on things that cross my mind. The subjects will be technical.
Only a few of the many links are given here. But
some lead to more links.
I have several technical notes in various stages of editing.
hope to have two to four updates during the first year, but will fade
James Clynch is a retired professor and scientist.
for over 3 decades in pure and applied research centered on
navigation systems - mainly GPS and the older Transit system. He worked
applications of these systems as precision systems, and their
a probe of the ionosphere and atmosphere. For the first 2 decades he
at the Applied
Research Laboratories attached to the University of Texas at
Austin. For the last decade he did research and taught
courses in geodesy and
navigation at the Naval
He can be reached by email at