1. Using the Underground Traverse Calculator

2. Team #1 Begins a Traverse Luke Skywalker and Sandra Bullock begin an underground traverse as Team #1 There first action is to go to Grate above their “Mine Shaft” and hang their two plumb bobs

3. They Carefully Measure How Far the Plumb-Bobs are from the corners 1 foot 1 foot

4. Now They Enter Their Data in the Spreadsheet The Spreadsheet calls for these distances to be entered in inches

5. They Set Up Their Instrument Underground So that they can sight directly across the strings that hold the plumb bobs They set the backsight angle on their Nikon 20 Total Station to 0 They measure the distance to the closest plumb bob (called plumb-bob 2 by the spreadsheet) And they measure their height of instrument.

6. They Enter Their Measurements into the Spreadsheet The distance from The plumb bob to Their instrument was 10.25 feet The height of their Instrument is 4.6 feet (note that the units Must be by decimal Feet) The spreadsheet is now reporting their backsight azimuth and the coordinates Of their station location.

7. Luke and Sandra Set Up a Foresight Point Through Where the Pipes Cross the Tunnel They put in their Angle to the right (289 30 00) And their vertical Angle (92 05 00) They put in one To indicate they Worked DMS And another 1 to Indicate they had A zenith angle instrument

8. They Also Put In Their EDM Data The Coordinates of the Foresight Point Appear

9. Luke and Sandra Next Move to Point B and Shoot Down the Tunnel to Where there is a Branch They put in their Horizontal and Vertical Angles Their EDM dat Their height of instruments And the 1’s that indicate They had a Zenith Angle Instrument working in Degrees Minutes and Sec.

10. They Move Down to Point C From Here They Will Take Three Types of Shots 1- They will turn and take A side shot down the Branch Tunnel. (The Spreadsheet calls this a Branch shot) 2- They will shoot down to A manhole using a side Shot. (The Spreadsheet Calls this an intermediate Shot). 3- They will shoot to a Foresight where the tunnel turns

11. They Take the Side Shot Down the Tunnel and Put in the Data Angles EDM Data Height of Instrument Instrument Type They get the coordinates at the end of the side tunnel

12. They Take A Shot Down the Tunnel to Where the Reflector is Placed Beneath the Manhole Cover They get the coordinates under the Manhole Cover.

13. Then they Take the Foresight Shot to Where the Tunnel Turns Sharply Left They get the coordinates of the next point They will occupy

14. Sandra and Luke Continue Their Survey They work their way down to where they will get the coordinates of the two points used by other teams to go further down the tunnels Of course their own tunnel did a T at one point. Now they must go back and survey where the Tunnel went the other direction.

15. Here is Their Situation They reset their instrument under Their Point B (which they already have the Coordinates of) They set a plumb-bob on their old station C (Which they also have the coordinates of). They will use point C as a Backsight They set up a Foresight Point down the Branch of The tunnel they will now survey.

16. The Spreadsheet is Arranged Like This Team #1 calculations Starting at the Plumb-Bobs hanging Down the shaft. Calculations for any other team starting a survey given Two known points (surveyed in by another team that Brought control positions and directions in from the Plumb-bobs hanging down the shaft).

17. Luke and Sandra Take A Look At This Area of the Spreadsheet Sandra and Luke note that virtually any team that started with Two points provided by another team would begin here. Point 2 is where they are set-up Point 1 is the backsight.

18. They Put in the Point Coordinates and Get the Direction of Their Backsight Line

19. Now They Get Ready for Their First Foresight Shot Down the Tunnel They put in their data and get the coordinates of the Next station they will move on to occupy.

20. Things for You To Note This Slide Set Shows you how to –Establish a backsight direction and instrument position from two plumb-bobs hanging down the shaft. –Establish a backsight direction and instrument position if you have the coordinates of two points and set up under the 2 nd. –How to take a shot down a tunnel that branches off of the main tunnel –How to take a shot to an intermediate point down a tunnel such as a manhole cover of vent grate These same operations should allow any of our Underground Survey Teams to get the coordinates of the points running down the center line of our underground steam tunnels.