CE203_Assignment_5

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Purdue University *

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Oct 30, 2023

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CE 203 – Principles and Practice of Geomatics Fall 2022 LYLES SCHOOL OF CIVIL ENGINEERING Lab 5. Vertical Curve & Kinematic GPS Survey Due date: October 2 nd , 2022 Objectives: This assignment aims to: a) Learn how to solve some vertical curve problems and b) introduce the use of GPS surveying grade GPS in the real-time kinematic mode for determining three-dimensional coordinates of points, including comparing the results of the data with some predetermined values. Vertical Curve (50 pts) 1. An equal tangent vertical curve has the following data: Station of PVI = 30 + 00 Elevation of PVI = 200.00 ft Back tangent grade = -6% Forward tangent grade = +4% Length of curve = 800 ft The curve elevation (ft) at Station 31 + 00 is most nearly? (include diagram) 2. For an equal tangent vertical crest curve, g 1 = +2%, g 2 = -1%, L = 600 ft, Y BVC = 100, what is the maximum elevation? 3. A vertical sag curve has a length of 10sta and connects a -2.0% grade to a 1.6% grade. The PVI is located at station 100+00 and has an elevation of 85.00ft. What is the station of the low point? (include diagram) Kinematic GPS Survey (50 pts) 1. Plan the survey This lab will be conducted in the same field as the previous lab (3 and 4) in the area as shown in Figure 1. Each group will plan a survey of the entire field systematically measuring points P, Q, R, T, U, V, and W including stations L and N or as instructed by the TA. Groups will rotate the stations throughout the survey, and the rover will be moved to collect the points of interest. Consideration should be given to potential problems with multipath and any other source of interference, as well as gradients in topography. 2. Conduct an RTK GPS Survey Each group will use an existing base station at the Purdue Agronomy Farm (ACRE) to conduct an RTK survey using INCORS, collecting ~20 epochs in each occupation (time will vary, depending on the PDOP and the signal strength). Members of each group will take turns acquiring data with the Rover. Record the settings for the survey and document the number of satellites in view, HDOP, VDOP, and PDOP during the survey - for every station setup( not every 5 minutes as in the previous lab ).
CE 203 – Principles and Practice of Geomatics Fall 2022 LYLES SCHOOL OF CIVIL ENGINEERING 3. Analyze Data from the RTK Survey Groups will download data from the receivers as instructed by the TAs, who will share the data with the groups for analysis by individual students. Students will import the combined sets of GPS points into MS Excel and compare the results obtained in lab 3 and lab 4. 4. Write the report Each student will write a report that will include the process used for planning the survey, justification for the locations of the RTK points collected, and a summary of the survey operations. The report should also include a screenshot or plot of the original survey locations marked on the image in Figure. 1, a table showing the coordinates collected from the GPS survey. This could be done with CAD or hand-marked using your tablets, and answers to the following questions should be captioned in your report: a) Carry out a quantitative comparison of the coordinates observed over the stations relative to the values you found in Lab 3, and Lab 4. b) Discuss any significant differences between these values and those of Lab 3 and Lab 4 and consider what the reason might be. c) Having completed the survey of the same field using the three survey techniques, which one do you think provided the best results and why? Table 1. Known coordinates of points P, Q, R, T, U, V, W (Coordinates are Indiana State Plane West NAD83, meters. Elevation is NAVD88, meters) Station E (m) N (m) Elev. (m) L N P 914250.045 575251.34 155.817 Q 914270.100 575246.135 156.476 R 914279.967 575233.761 156.214 T 914283.931 575206.973 156.300 U 914273.415 575258.551 155.993 V 914300.708 575225.292 155.516 W 914272.545 575250.700 156.074
CE 203 – Principles and Practice of Geomatics Fall 2022 LYLES SCHOOL OF CIVIL ENGINEERING Table 1. Known coordinates of points P, Q, R, T, U, V, W (Coordinates are Indiana State Plane West NAD83, feet. Elevation is NAVD88, feet) Station E (ft) N (ft) Elev. (ft) L N P 2999508.022 1887307.546 511.211 Q 2999573.819 1887290.469 513.373 R 2999606.191 1887249.872 512.513 T 2999619.196 1887161.985 512.795 U 2999584.695 1887331.204 511.788 V 2999674.239 1887222.087 510.223 W 2999581.841 1887305.446 512.054 Figure 1 – Survey Area for Lab 5.
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