Plot Surveying Protocol

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Total Station Surveying Protocol

Internal data collector procedures:

  1. Configure the total station with the necessary settings
    1. Select escape (ESC) enough times to end up at a menu screen with a large fonted SOKKIA logo in the upper right hand corner. Choose (JOB) select the job that you want or create a new job. Note Steps 1a.-e. should be in the job that you have selected.
    2. Hit escape (ESC) on the right side of the total station a couple times to get the to the main screen.
    3. At the bottom of the screen you will see three categories measure (MEAS), memory (MEM), and configure (CNFG), choose the configure option by pressing the F4 key that is rightmost at the bottom of the total station.
    4. Choose the observation conditions tab, and make sure that Distance mode is 'Hdist', V.obs is 'Zenith' and that Coordinates are 'E-N-Z'.
    5. Choose the Units tab and make sure that Angle reads 'degree' and Dist reads 'meters'.
    6. Choose the Key function tab select Define and decide the key functions you want presented on the front of the total station. The most important ones are COORD, 0SET, MENU, H.ANG, OFFSET, REC, S-O as long as these seven are presented somewhere in the 12 function set up you will be able to do stakeout surveying. As you will notice there will be three rows and four columns. Each row of four is what will be presented as selectable with F1-F4. when you hit the function button (FUNC), you will toggle through each row and a new set of four will be available to select from.
  2. Hit escape enough times to find yourself at the main title screen and select memory (MEM).
    1. Choose the Known data tab and key in the coordinates that you desire to stake-out or use as control points. Since we determined the units to be in meters we can enter these in UTM.
    2. First enter the Easting then the Northing then the Elevation. You can do this with the Function keys at the bottom and the blue function circle to the right of the screen to toggle or you can use the remote that comes with instrument.
  3. Now that you have the settings all configured and the coordinates are entered you are ready to set up the instrument.
    1. Take a tripod and set it as best you can over the control point without the total station screwed onto to the tripod.
    2. Unlatch the total station case and remove the total station, with one hand on the handle above the scope and another hand under the tribrach, which is the triangle piece that the instrument is connected into, when instrument is on keep holding top with one hand while screwing the total station into the legs with your other hand.
    3. Find the optical plummet that is coming out of the instrument at 45 degrees and look through it.
    4. Adjust the leg positions until the plummet seems to be over the control point and stomp the legs in.
    5. Level the tribrach by raising and lowering the legs until the level bubble is in the circle.
    6. Level the total station ('the gun') by using the fine tuning knobs that are on the tribrach. Set either face of the gun parallel with two of the fine tuning knobs at the base of the tribrach turn them until the bubble level on the instrument is in the middle of the two longer red lines.
    7. Set either face of the gun perpendicular to the same two fine tuning knobs that were used to adjust the level in step 3f and use the opposite side knob to level the gun with respect to the y-axis.
    8. Check the optical plummet to make sure that it is still directly over the control point and if not unscrew the instrument slightly, not all the way and slide it across the top of the tripod until it is directly over the point, at this point you will need to repeat steps 3f and 3g until the gun is level and over the point.
  4. Now that the total station is level and over the point you are ready to set up the instrument's position.
    1. Set up a back-sight on a second control point, by using either a pole sight or the ski poles and another rod with a prism attached and measure the height. This second location is to define the baseline or zero line that all the other points are to be determined on.
    2. Look through the instrument's scope and center the cross-hairs on the center of the back-sight target.
    3. Tap the zero set button twice to set the defined angle.
    4. Choose Set H angle enter the coordinates in that will determine your station and your back-sight, this can be done easily with the read key which will read in pre-entered coordinates. You will be asked for the height of the instrument which you can determine by placing a meter tape from the top of the cap to the gray line that is on the side of the instrument directly in the middle of the prism. This will be in meters as we configured in step 1.
    5. Now you will be asked what point you want to read in for your back-sight with a target height.
  5. Now that your instrument has been set up in space it is time to start stake-out.
    1. Hit the escape key enough times to be at the display screen that has your angle and all the F function keys at the bottom. Choose S-O and then select S-O data.
    2. If you can not see the function that you want you can press the lavender function key to the right of the display a couple times it should then appear as an option.
    3. From here you can read in the point that you would like to stake-out.
    4. There will be many different options for how you want the information presented either S-O H, S-O V, S-O Coord, or S-O Ht. The two options we will use are S-O H and S-O Coord.
    5. From S-O Coord. you will be able to read in the point by pressing the READ button which is located at F1 .
    6. Press the S-O button enough times to arrive at S-O H and press OK.
    7. Turn your dHA until it reads 00°00'00.
    8. Have a second person ('instrument person') with a level pole prism stand roughly where you think the point is and press the OBS key, this will record the distance and horizontal angle.
    9. The instrument will prompt the instrument person to either go out or in however many meters to reach the point being staked out. If horizontal distance is positive (+) move the prism toward the gun if it is negative (-) move the prism away from the gun.
    10. Continue this process until the distance reads 0 meters.
    11. Put some flagging around the nail and put the nail in the ground at the location of the point and have another observation taken at that point and press REC.
    12. Be sure when recording the point when it prompts you to put the rod height in that you put the correct rod height in meters so that the point is correctly stored in 3D space.
    13. Use a sharpie to write the point number on the pin flag and place the pin flag in the ground within a half a foot of the location of the point.

External data collector procedures

    1. The first part of stake-out using the external data collector is the same as steps 3a-4e for the Internal Data Collector.
    2. Starting a new Job.
      1. Select Jobs then select New Job.
      2. Select a job name then in Properties set the Coord. sys to (UTM) and set the Units(dist.) to Meters
    3. Interfacing the total station with the trimble data collector.
      1. Using the total station, from the SOKKIA title screen for the specific job you are doing, choose configure CNFG then scroll down to Comms setup.
      2. Make sure the baud rate is 9600bps then hit escape to return back to the title screen.
      3. Using the data collector plug the 9 pin female end of the gray interface cord into the 9 pin male end of the Trimble.
      4. Using the total station plug in the 6 pin male end of the gray adapter into the female end of the total station.
      5. Now that the cord is attached it will inform you that it is connecting to the total station.
      6. On the front of the Trimble screen there will be six categories they are Jobs, Key in, Cogo, Measure, Stakeout, Instrument.
      7. Select the Job key using the stylus that is found above the data collector. Here you will choose the job already created or create a new job.
      8. Select the Key in function, then select points and key in the coordinates (UTM X (Easting), Y (Northing), and Z (Elevation)) of the points to be staked out.
      9. The point name is the numerical point number and the Code is an alpha numeric title that you give the point for example '18in pop' is an 18 inch poplar tree.
      10. Enter in the Northing on the left and easting on the right and if the point is a control point put the elevation. If the point is a grid point elevation can be put in or neglected.
    4. Staking out points with the external data collector.
      1. Select the Stakeout key then select Sokkia then station setup. The data collector will then begin connection to the total station.
      2. The next screen that will come up is Corrections in this screen set the Pressure to 30in-Hg the Temprature to 60.0° F, the PPM to 0 and the refraction constant to 0.142. Choose Accept once all these corrections are made. Note that these were corrections used for surveying in Baltimore MD USA during the summer season.
      3. From Station setup The point name is the control point you are setting the total station on. and the instrument height is the height of the instrument once it is level and over the point. Once you select Accept you will be prompted to enter in your back-sight information.
      4. Select back-sight point name and choose the point that your back-sight is currently set up on.
      5. Put the measured height into the data collector (in meters). and make sure that the Method selection at the bottom left is set to Angles and distances.
      6. Then you will be prompted to Measure at the bottom left hand of the screen. When this is done you will be given amount of error that is in inyour vertical and horizontal directions. If this is not within acceptable limits remeasure until within acceptable limits. If it is within acceptable limits such as 0.01 meters in your vertical distance and 0.01 meter in your horizontal distance then choose store. the data collector will then say station set up completed.
      7. Select Stakeout then Points and choose the point you would like to stakeout in Point name.
      8. The data collector will now instruct you on which direction to turn the total station. Once you have reached the desired angle and the person holding the prism is roughly where you think the point is.
      9. Select the Measure key that is rectangular and at the left side of the middle of the bottom of the display screen of the data collector.
      10. After the measurement has been taken select the Target button and input the rod height in meters.
      11. The data collector will now tell you how far left and right in and out you need to go in order to reach the desired point.
      12. Now in the screen Confirm staked deltas you will be shown the error in a rectangle at the bottom right 'delta North, delta east, and V.dist' if this error is within a tolerable range select Store.