Least Squares – Miscellaneous Page

This page contains miscellaneous Least Squares settings.

File

Lists the current Least Squares Data file. If you working with a Least Squares network, this file fill have the same name as the survey file. In the case of a traverse adjustment, the filename is a combination of both the survey and traverse names. The filename is listed here for your reference only. You can not change the name.

Redundant Observation

TPC treats this character as a redundant observation indicator when it is the first character in a point description and is followed by a valid point label. This allows any data collector to collect redundant information regardless of whether or not it can include a shot to an existing point.

Example: If a shot to point 100 includes the description “#17 1” I.P.”, the Least Squares analysis will interpret this as a redundant observation to point 17.

If you include additional information in the point description like the 1”I.P. in the example above, the additional information must be separated from the point label by a space, colon or comma.

Blunder Factor

Enter the factor above which you want TPC to report blunders. A blunder is considered to have occurred if the computed residual value of an observation is greater than the APRIORI value for that type of observation multiplied by this factor.

Plot Ellipses

Include the ellipses in Drawing View. You must have a Least Squares solution for ellipses to be plotted.

Save As

Choose this option to write a TPC Least Squares data file (LSA extension) to record the state of the survey points involved in the adjustment. The saved file becomes a backup record of what you have done. You might choose this option to save a network you are building at each stage of its development.

You may never use the files you and TPC does not currently allow you to open them. You can however, rename any one of these files to the survey filename and it will become the current analysis for the survey.

A Priori Values

Choose this option to Least Squares Standard Errors dialog. From this dialog you can change the default standard errors to use in the analysis. These values are incorporated into the analysis as the coordinate and observations records are being created. Of course you can always change them later by editing the Points or Observations.

Write Starnet File

Choose this option to write a Starnet V4.0 compatible data file. TPC uses the survey filename along with the .DAT extension used by Starnet. This file can be opened in Starnet and analyzed.