Discussions of Least Squares Adjustments

An Adjustment Including GPS Vectors, OPUS and OPUS-RS Coordinate Observations

Combining OPUS Solutions Series

This series, originally posted on RPLS.com, discusses the extended output now included in OPUS solutions and how to use the extended output to combine multiple OPUS solutions. NGS included the extended output at the request of the Surveying Community. These posts demonstrate the usefulness of the extended output.

• Using the Orignal Observations

  • Combine Opus Solutions By Extracting The Actual Gps Baselines From The G File In The Extended Output
  • Link To Original Rpls.Com Post

• Using Coordinates as Observations

  • Combine Opus Solutions Using The Solution Covariance Matrix In A Least Squares Adjustment
  • Includes Derivation
  • Link To Original Rpls.Com Post

• Using Contrived Zero Observations

  • Combine Opus Coordinate Solutions Using Commercial Least Squares Adjustment Software
  • Includes Derivation
  • Link To Original Rpls.Com Post

• A Hybrid Covariance Matrix Replacement for OPUS Solutions

  • Uses the Peak-to-Peak Errors to derive more meaningful standard deviations
  • Maintains the correlations from the original OPUS covariance matrix
  • Link To Original Rpls.Com Post

TextPap Clip Library and Syntax Files for Columbus Network Adjustment Software

For those using TextPad and Columbus Network Adjustment Software I have developed a clip library and syntax definition file for TextPad. These two files make editing Columbus projects much easier. Using the syntax definition file the Columbus keywords are highlighted while editing the Columbus document in TextPad. Using the clip library one can insert observations, set and change observation standard deviations and change other Columbus setting simply by double clicking on a list.