Least Squares - Step 2 - Solve Page

Once you have completed Step 1- Analyze, you are ready to solve the network or traverse.

Note: Solving the network does NOT update any of the survey points. The survey points are updated in Step 3 – Update Survey.

Converge Limit

The converge limit determines how little the adjusted coordinate values must change between iterations before a solution is declared. The smaller the converge limit, the more iterations are required (default = 0.001).

The converge limit is a distance, in survey units. So a limit of 0.001 in feet means that both the X and Y coordinate values of each network point being adjusted must change by less than 0.001 feet in order for the solution to converge.

Max Iterations

Set the maximum number of iterations allowed (default = 5). If the converge limits are not achieved in this number of iterations, TPC reports that the solution did not converge.

Networks often converge in just a few iterations,.

Report Iterations During Solution

Turn this on to include the matrixes used in the solution. TPC will include the coefficient, precision, covariance, residual and adjustment matrixes for each iteration.

[ Iteration #1 ]

A (Coefficient) Matrix:

K (L) Matrix:

Q (Covariance) Matrix:

X (Changes to Unknowns) Matrix:

V (Residuals) Matrix:

Include Robustness

Turn this option on to include the robustness test in which the solution is run twice to magnify any blunders.

Optimize Solution

Turn on the option to enable memory and speed optimizations. TPC does not currently include any optimizations. If you experience memory or speed limitations, please contact TPC technical support for availability of optimizations.

Solve

Compute the solution. You can repeat this step any number of times. Each time you do, TPC starts with the current unadjusted coordinates and observations.

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