We need some help

[John Halleck]

On Wed, 29 Mar 2000, Wookey wrote:

> [...  pointing them to my article ...]

  I *REALLY* need to get back to that project...

> The Survex source provides a useful engine for processing data which you
> may find useful as either a reference or a starting point. It is the only
> existing survey reduction engine that uses co-variance info (apart from
> John Halleck's demo code).

  And my demo code is not complete...

  Picky point:  There are lots of engines that compute full 3D weights
  from the full covariance matrix.    *BUT* there aren't many that are
  non-commercial, and therefore there are not many publicly availiable.

  There are also any number of books (for surveyors) that cover the 
  subject in almost painfull detail.   I have some bibliography at:
     http://www.cc.utah.edu/~nahaj/cave/survey/bibliography.html
  The one I've found clearest is "Analysis and Adjustment of Survey
  Measurements" by Mikhail and Gracie.