Closure Information

This option gives detailed information about each loop that was closed. Here is a sample listing:

Closure Information:

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Index: 0  Station One: 15  Station Two: 21  Common: 12

Loop Length:    48.9ft

Fixed Length:  5.4 ft

Residual Error - North: 0.0000ft East: 0.0000ft Vert.: 0.0000ft

Loop Status: Closed   ($0001)

Closure Is Between: A16-A22

      A16,A15,A14,A13

      Common point: A13

       A22,A21,A20,A19,A18,A17,A13

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Indexes. The first line displays index information. An index is just the number the program uses to locate each shot and loop in the survey. These numbers are not very useful for the user. They are mostly used for testing and debugging purposes. The list displays the index of the loop, the closing shot and the common station for the loop.

Loop Length: This item displays the length of loop, minus any part of the loop that might be formed from by a pair of fixed stations.

Fixed Length: A loop can be formed by having two fixed stations. This item displays the length of the portion of the loop that is between the two fixed stations.

Residual Error. The next part of the listing displays the residual error after closing. This should always be zero unless the loop was uncloseable. This can occur when all of the shots in a loop are either excluded or a part of a loop that has already been closed.

Loop Status. The next part shows the status of the loop. This indicates how the program handled the loop. There are three ways the program can handle a loop: Closed, Uncloseable, and Zero Length. Here is a description of each:

Closed - Indicates that the program adjusted the loop to near zero error.

Uncloseable - Indicates that the program was unable to close the loop. This occurs when all of the shots in a loop are either excluded or part of a loop that has already been closed.

Zero Length - This is an error condition where all the shots in the loop total zero length.

Loop Stations. The final part of the data shows the stations in the closing shot, the stations around both branches of the loop and the common point.