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Before any station setup, you will need to ensure the following:
- LPS_Setup program is installed on the instrument
- Units are set on the instrument
- A control file is loaded into LPS_Setup
- Now, go to Station Setup Wizard.
- The Setup method has three options in the dropdown box. This example will use New station by resection.
- This method places the instrument on an unknown point with a line of sight to at least two control points.
- The map to the right shows an example of a resection. The red triangles are backsights while the yellow triangle is the instrument.
- With the instrument setup over a control point, use a tape measure to measure the slant height from the control point to the vertical center of the instrument. This is the pivot point of the collimator. Most instruments will have a small mark on the side to measure to.
- This height is entered into the Instrument height field on the total station.
- Now, tap the Next button.
- A resection will require at least two backsight shots. To start the first backsight shot, tap the Add... button.
- Tap the Point Name: button to define the first control point. For this example, CP-1 is used.
- Once the backsight prism is setup over the control point, sight the instrument to the prism. Enter the correct height and Prism Constant (PC) values and hit the Observe button.
- After the shot has been taken, there should now be values in the H.Angle, V.Angle and S.Dist fields.
- Tap the OK button to continue to the next backsight.
- Tap the Add button to start the second backsight. For this example, Pole 1 will be used.
- This time, the prism height and PC are changed as a different style of prism is used. Sight the instrument on the prism and tap the Observe button. HA/VA/SD numbers should now be shown in their respective fields.
- Tap the OK button to store that backsight.
- If the horizontal, vertical and distance measurements are used on both points, only two backsights are required. If only horizontal or horizontal and vertical are used, a third backsight is required.
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LPS_Setup will give a warning that resection setup requires one of the following scenarios:
- More than 3 pts: Three points using any combination of H/V/D observations
- 3 pts with one measured distance: Three backsights with one distance observation used
- 2 pts both with measured distance: Two backsights that both used the distance observations
- Once LPS_Setup has a proper resection solution, you will see a screen that shows the computed station values. Tap the Next button to proceed to the Station coordinate screen.
- The North/East/Elev values here are the computed values based off the resection shots.
- LPS_Setup will give you the option to save this computed point for future use. For this example, the point has been saved as RS01.
- By saving this point, you will be able to use it as a resection or backsight point in the future. The North/East/Elev values and point name are amended to the control point file.
