The starting point for any adjustment process is to set your defaults and prepare you data.  Whilst Star*Net can provide you with a black box solution you should spend some time thinking about your data and how best to present it.

 

Star*Net will require you to provide a set of coordinates for fixed or known points.  It will then use these values to calculate approximate coordinates of the unknown stations, if possible.  Alternatively, you may enter these approximate coordinates yourself and identify these as ready for adjustment using control characters previously mentioned in Data Preparation.

 

Star*Net uses an iterative process to calculate the corrections to these approximate coordiantes using a process called Least Squares Variation of Coordinates. The termination and validation of the computation is based on a statistical confidence level, normally the 95 percentile.

Before we look at the results of these calculations the first process should be to analyse the validity of your data.  Star*Net provides a pre-adjustment analysis routine that will identify any inconsistency with your data, and produces a report indicating the line where the problem lies.   You will be directed to open the error file and read the message.  Here it is telling us that we are using the demo version of Star*Net and there are more than 10 stations!

Having established that the data is satisfactory, you can move onto the next stage, which is Adjust Network.  During all phases of the data preparation and processing, various output options are available including listing the results.  The screen display below shows part of this report highlighting the statistical analysis of the calculations.

 

 

Warnings will be given where values exceed predefined limits, especially where the standard errors have been exceeded.  A graphical display of the error ellipses is available as shown below.

 

Finally, export options are available for DXF and station coordinates.  These can be loaded back into ⁿ4ce for further processing.

 

You may wish to downloads the 10 station evaluation copy of Star*Net and try this with your own data.  This is accompanied by a Tour through Star*Net PDF file.