Part 4: Conclusion Your conclusion should include the following at a minimum: A discussion on your analysis on how well your traverse met the project requirements. Also, comment on the level

of agreement between your computed traverse station coordinates and those obtained using GNSS. A discussion of any large differences and/or other issues encountered and recommendations for addressing them (e.g., more data, different field procedures, updated equipment calibration, different processing procedures, etc.). If no large differences or other issues were encountered, you may still wish to provide recommendations for further improving the accuracy of your final station coordinates (e.g., differential leveling between stations to improve vertical accuracy). ●/n INTRODUCTION.. METHODOLOGY.. New Parking Lot Expansion Project CE 361 Submitted by: Andreson, Alenezi December 4, 2022 TABLE OF CONTENTS Table of Stations and Ground Distances.. Change in Elevations... GNSS Coordinates….. Found azimuth using coordinates... Trav 2.2 Compass rule adjustment coordinates.. .3 .4-7 .4 5 5 .6 .6 Orthometric heights of stations... Final Table of values... ANALYSIS.. Comparisons of GNSS and Transverse Coordinates.. Introduction: 7 7 .8 .8 Our company has completed a traverse around the North Mcnary field to set up construction control stations for the new parking lot expansion project. To complete this project we used a Leica total station, serial number (insert it) and a leica 360 degree prism. For this project we kept the rod height constant at 5 ft tall and used a bipod to keep the rod steady when possible. The first step in this whole project was setting up our station markers out in the field. When we did this we marked station ties to be able to find the stations at the time of the traverse. On the day of the traverse we got to the field with our total station, rod, prism, tape measurer and psychrometer. The first thing we did when we got out to the field was set up our prism and rod on a station. We decided to go counter clockwise when we did our traverse so we set our rod and prism on the station to the left of our total station. Then we set up our total station and set all of the settings we needed. A total station uses the pressure, humidity and temperature to account for the errors due to the air. So we used the psychrometer to get these values for each reading with the total station. Once we get the total station set up we can start taking measurements. The first part of taking the measurements in aiming the total station at the backsight. Once we do this we set that to be our zero point that has no angle to it. Then we plung the scope which means we turn it 180 degrees and reshoot the measurement. After we do that we unplung the total station and move the prism to the station to the right. We then turn the total station to the foresight (the prism in front of the total station) but we have to make sure it is the angle to the right as that is how we get our interior angle. Then we just repeat this until we get around the whole traverse. On the first run of our traverse we did not get under 55 seconds of angular misclosure so we had to go out into the field again and redo parts of the traverse. The second time around we met all the requirements. Then on a later date we went out and got real time and static GNSS data to ge coordinates For the traverse we needed to get under an angular misclosure of 55 seconds, under a 1 part in 5000 relative error of closure and and an elevation error of less than 0.2 feet. All of these being plus or minus the value. For the angular misclosure we are looking to see if our angels we find are equal to 720 (sum of interior angles for a 6 sided shape). The relative error of closure is how far off of the original station you are based on your angles and lengths. The one part in 5000 means every 5000 ft we go we will have an error of 1 ft from the original point. Then the elevation misclosure is just the change in elevation from the point you started on. Methods: The first thing we did was take our interior angles at each station and reduced it by finding the mean of the angles and adjusting ours accordingly. We do this to account for discrepancies in the instrument. Then for our average horizontal ground distance we took the mean of the four different shots. The reason we have four different readings is because we have the direct and reverse as well as the foresight and backsight. Then for the grid distance we multiplied our answers by our combined scale factor for the north field. STA Table of Stations and Ground Distances Interior Angle Ground Distance (ft) Average Ground Distance (ft) 13 14 15 16 17 18 198°04'23" 63°13'18" 107°15'57" 153°27'58" 158°23'30" 39°34'47" 231.28 163.34 260.33 175.7 116.62 319.26 Side of Traverse 13-14 14→15 15-16 16-17 17-18 18-13 The change in elevations were found using the total station during our traverse, So we had four readings for each elevation change(direct,reverse,foresight,backsight). When we calculated our sum of the elevations we found that we only had an error of -0.01 ft. For adjusting the elevation we decided to deal with it by adding 0.01 ft to the biggest difference in readings we had. This was the elevation change from 15 to 16, after applying these corrections it brought us to a zero elevation change. Change in Elevations 231.267 163.331 260.315 175.69 116.613 319.241 Avg. ▲ Elev. (ft) 2.63 0.53 -3.4 -0.76 0.24 0.75 Σ of ▲ Elev. Adjusted Elev. (ft) 2.63 0.53 -3.39 -0.76 0.24 0.75 Σ of ▲ Elev. STA 13 After we calculated all of our traverse computations, we took real time and static GNSS data to get coordinates for our points. During this process we used a LEIGS14 antenna at 2.000 meter rod height. For the real time data we set up above each station for about 30 seconds and collected the data. We repeated this for all of the stations. For the static data collection we set up above station 15 for 20 minutes. Using these coordinates we can find a grid azimuth for one of our points. We needed to choose a point that we wanted to find the coordinates for as well as the azimuth to input into Trav 2.2, we chose station 13. So we found our azimuth from 13 to 14. Then we took the coordinates for 13 and 14 and found the departure and latitude. From there we went and found our starting azimuth. 14 15 16 17 18 -0.01 ft Side of Traverse 13-14 GNSS Coordinates Northing [ift] 340323.55 340333.88 340476.27 340421.86 340312.29 340211.07 Found azimuth using coordinates 0.00 ft Easting [ift] 7479907.97 7479676.95 7479756.89 7480011.46 7480148.84 7480206.73 Azimuth 272°33'44"