SURPAC Surveying
Software
An underground Peg Calculation using the Double Back Fix Method
Underground
Peg Calculation using the "Double Back Fix" Method
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The
programme is designed to handle a number of Peg Fixing and/or Checking for
the Mine Surveyor. |
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The
main difference between this programme and the previous Double Set-Up and
Double Button Methods, is that the Peg to be fixed, or checked, is the
Set-Up Peg itself. |
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This
programme can be used, for example, for the following :-
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The
programme provides for full double Arc measurements for both Horizontal
and Vertical angles, and for double Buttons and double measurements for
each sighted Peg. Users can either use these full observation and
measurement options, or restrict the survey to a single Horizontal and
Vertical Arc, the use of single Buttons and single Distance measurements
to the sighted Pegs. |
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The
principle of the programme is relatively simple. It is based on the
determination of Directions (or Bearings) plus a base distance comparison,
using the “two sides and the included angle” technique for any three
Pegs representing the apices of a triangle. The programme is also able to
handle the situation where the three Pegs are in a straight line. |
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The Height of the calculated Set-Up Peg is determined by Trigonometrical Heighting from observations taken to buttons (or bobs) suspended from the two sighted Pegs. For best results, the double buttons should be observed at each sighted Peg. |
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The
required method of Survey is a Set-up at the Peg to be fixed, or checked. |
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At
this Set-Up Peg, the following quantities should be measured and/or
observed :-
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The application allows for data entry by :-
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Calculation will only take place if none of the angular and/ or linear measurements exceeds the User specified limits. These limits are compared to the calculated differences for Vertical Angles, Horizontal Angles, Horizontal Distances and Vertical Height Differences. The ability to modify these limits is limited to Users having the necessary Security Code. This Security Code prevents un-authorized Users from changing the limits. |
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After calculation takes place, the Co-ordinates and Peg Elevation of the Set-Up Peg (New Peg) will be stored in the current Co-ordinate File. |
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The results of the Peg calculation will also be stored in the Multi-Polar/Peg File of the current Co-ordinate File. This file will hold and display up to 4 determinations of a Peg, over and above the actual co-ordinates (current values) stored in the Co-ordinate File. Running the Edit a Multi-Polar/Peg File (found under the General main Menu) programme will generate a display of a summary of all determinations of existing Pegs in the Co-ordinate File. The stored ASCII file (type ***.pg3) can then be called, for any the Point/Peg determinations, which will in turn generate a full display of all the observational and derived data for the New Peg calculation. |
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After
calculating the Set-Up Peg, an ASCII
Peg File (type
***.pg3) of all observed and derived data my be created. This ASCII file
has four main uses :-
The results of the New Point just calculated can easily be imported back into
the application at any future time, preventing the time wasting and possible errors of re-entering these data manually. Even if the observational data originally came from an Observation file, the ASCII file contains extended information relative to the Peg calculation. When
doing a Right Button Click on a Point displayed in the Co-ordinate File,
for example, it is possible to display the contents of any ASCII Peg file relative to a required
Peg and to re-calculate the Peg. If
the User requires an output format different from the one used by
SURPAC, the data from the ASCII
Peg File can be easily imported into a
User generated application. It
provides a backup for all observational data used to fix the Peg. |
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The
option to Print the results is available, after the on screen entries have been made and
checked and the New Peg calculated. |