CE203 Lab Assignment 8 (1)

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Purdue University *

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20300

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Civil Engineering

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Feb 20, 2024

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CE 203 – Principles and Practice of Geomatics Spring 2023 LYLES SCHOOL OF CIVIL ENGINEERING 1 Lab 08. Elements of Surveying Measurements Due date: March 20, 11:59 pm (See Brightspace) All report content must be typed. 1. Summarize the following table that you may need to use between different length unit systems. Keep six significant figures if the numbers need to be approximated. (10 pts) mile kilometer meter foot 1 1 1 1 meter inch meter US survey foot 1 1 1 1 inch centimeter 1 1 2. Professional organizations (10 pts) Find the state-level professional (land) surveying organization(s) of your interest state (e.g., Indiana) and briefly describe its routine activities. Do the same for the US. (max. 200 words).

CE 203 – Principles and Practice of Geomatics Spring 2023 LYLES SCHOOL OF CIVIL ENGINEERING 2 3. International foot vs US survey foot (10 pts) 1) The Civil Engineering building on Purdue campus is measured under one coordinate system as 507,332.28 meters Easting and 4,475,496.57 meters Northing. Express the coordinates respectively with the international foot and US survey foot. Keep 11 significant figures using common rounding off rules. 2) A runway of Purdue airport is measured as 6958.76 feet long. What would it be in the US survey feet ? How about if a runway of the O’Hare airport is 11,595.40 feet long ? 3) Based on the above 1) and 2) scenarios, discuss the significance of errors when the difference of the international foot and the US survey foot is mistakenly ignored. 4) Find out the possible fate of the US survey foot after year 2022 (max 50 words). 4. Trigonometry: height measurement/estimation without equipment (20 pts) Imagine this was over 2000 years ago. Find a way to determine the height of a target (e.g. a tower) which you had no access to. The only measurement you could make is distance on the ground. Requirements: 1) Draw a decent figure to show your method. 2) All derivations must be symbolic. You need to derive the formula(s) first and then use it to calculate the height of the target based on your measurements. 3) Determine the height of a building of your selection. You may select any building (house, apartment etc.), however you need to take a picture of the building and insert it into your report. 4) Option: determine the height of the Purdue Bell Tower. (10 bonus points)

CE 203 – Principles and Practice of Geomatics Spring 2023 LYLES SCHOOL OF CIVIL ENGINEERING 3 5. Quality of data collection (50 points) Install a smartphone GPS app (such as MyTracks). Leave your smartphone still (!) to record three distinct locations each with approximately 10 min at a sampling interval of ~2 seconds. 1) One location should be in an open area with good visibility, one at the neighborhood of a building/house, and one is indoor. 2) All shall be clearly identifiable on imagery (e.g., a corner of roads or grassland, backyard etc.; except the indoor case) General procedure and tasks: 1) Import all the three GPX files into ArcGIS Pro as separate shapefiles. 2) Convert the coordinate system to NAD83 UTM Zone 16N (if your collection was not in Indiana, please talk to your TA to find a suitable transform). 3) Choose an appropriate image basemap as background. 4) Calculate the means and standard deviations of your measurements respectively for the three locations. 5) Find a way to remove apparent outliers and recalculate the means and standard deviations; this step may need iteration. Max two iterations is sufficient for this assignment. 6) List the formulas that you (or the program/function) used. 7) Map in ArcGIS Pro the location of all your original measurements, and differentiate (e.g., through distinct labels) those that have been removed as outliers. 8) Calculate the residuals of your measurements and show their distribution (histogram). 9) Write an essay/report of max 400 words to discuss the quality of your data collection and the results. Include image clips to support your discussion and note down the phone model and GPS app you used. 10) Submit your GPX files.

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