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Final

# lab8final.doc

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School
York University
Department
Engineering
Course
ENG 2130
Professor
all
Semester
Winter

Description
YORK UNIVERSITY Faculty of Engineering ENG 2120 / EATS 2620 FUNDAMENTALS OF SURVEYING: LAB 8 Submitted to Prof. Wang Jian-Guo York University, Ontario Abstract: This lab focuses on learning the skills on how to apply basic principles of topographic surveys to topographic mapping and getting to know the field procedures in this matter. This lab was basically a long 1 part lab which involved taking point measurements using the Total Station instrument. We were guided outside by the TA and were advised to choose a location to set up the instrument that would minimize the interference with the “Traffic” and that is convenient in order to see as many points as possible. The next step was to accurately level the instrument and measurement of the instrument height was followed using a tape. We sighted a characteristic reference point and also set the horizontal circle reading to zero. The points for each student was identified and sketched. One of the team members was holding the target on those points and we started taking our measurements of the slope distance, zenith angle and horizontal angle at each point. The target height was also measured. Each student was doing 20 points so our points were total of 100 points. Introduction: The intention of this lab is to familiarize students with the skills of topographic surveying and mapping and also practicing the skills on an actual outdoor field. The measuring instruments used in this lab are the Total station instrument used in a lot of previous labs, tripod for setting up the instrument on it and a reflector used as a target. Total stations are Objectives: To apply the principles of topographic surveys to topographic mapping in order to gain the experience of field procedures of topographic mapping. Procedures: We practiced real topographic surveys outdoors. We made the decision on the accuracy of the observation, the density of the points etc. the area to be surveyed was identified by the TA and there was a certain degree of overlap in the areas and it is expected that only one station with arbitrary coordinates and elevation and a known orientation will be needed. Each team established a reference station in such a way as to minimize interference with the “traffic” but at a convenient location to be able to “see” as many characteristic points as possible. The instruments must be set up and levelled accurately. Once this was done, the instrument height was measured using a tape. Subsequently a characteristic reference point was sighted and the horizontal circle reading was set to zero. The second reading was reversed mode taken. Frequent checks of the zero setting were recommended. The final product is a topographic map to a scale of 1:500. The contour interval should be 20 cm. details such as curbs, paths, sidewalks, trees, lamp posts, buildings, fences, etc. must be measured. Horizontal and zenith angles and slope distances to these points will be measured and recorded properly in the field book along with a sketch showing their position. Sketches are extremely important for this type of survey. It is estimated that 75-100 points will be adequate to survey each of areas. When it comes to plotting the points, the method of polar coordinates can be used. Table 1: Total Station Measurements point Zenith angle Horizontal angleHT Slope 1 94 2 5 38 15 10 1.83 21.784 2 93 26 53 39 54 54 1.83 27.429 3 94 28 52 36 9 59 1.83 19.076 4 93 4 23 20 28 20 1.83 23.203 5 94 27 18 5 40 49 1.83 15.943 6 93 14 15 4 47 5 1.83 21.1567 7 93 53 5 347 17 55 1.83 16.556 8 92 42 38 342 48 34 1.83 21.5512 9 93 48 11 328 52 1 1.83 16.7703 10 92 27 3 324 50 26 1.83 22.23 11 93 25 45 311 37 53 1.83 16.9917 12 92 32 51 296 43 40 1.83 22.4207 13 93 29 32 283 3 1 1.83 17.227 14 92 27 36 270 5 29 1.83 22.66 15 93 34 12 264 1 27 1.83 17.1373 16 92 47 48 256 11 43 1.83 22.525 17 93 11 7 239 27 16 1.83 20.98 18 92 41 47 224 8 16 1.83 25.346 19 92 35 55 238 52 51 1.83 25.749 20 92 56 41 229 36 39 1.83 23.2857 21 92 26 7 232 3 3 1.83 27.75 22 92 41 40 223 9 28 1.83 24.87 23 92 27 27 213 22 57 1.83 24.973 24 92 35 53 209 18 2 1.83 20.33 25 92 24 17 198 9 56 1.83 21.509 26 92 20 38 193 32 18 1.83 17.9717 27 91 39 28 186 42 57 1.83 20.489 28 91 39 21 183 27 36 1.83 17.87 29 90 51 29 173 58 25 1.83 20.42 30 90 26 6 164 58 26 1.83 18.5793 31 89 57 27 161 13 35 1.83 20.609 32 89 26 29 152 31 36 1.83 20.6353 33 89 5 39 150 8 32 1.83 23.337 34 88 47 37 142 40 57 1.83 23.24 35 88 38 42 141 33 57 1.83 26.0127 36 88 24 20 135 8 16 1.83 26.68 37 88 22 56 134 52 37 1.83 29.181 38 88 11 37 129 18 48 1.83 30.29 39 88 11 8 129 37 1 1.83 31.34 40 88 11 18 125 41 4 1.83 36.594 41 88 9 59 121 37 9 1.83 37.292 42 92 37 54 218 7 52 1.83 26.6993 43 92 25 29 226 49 10 1.83 29.798 44 92 20 8 233 34 30 1.83 29.387 45 91 7 13 237 58 10 1.83 32.396 46 90 30 46 239 45 29 1.83 34.887 47 90 36 47 237 42 7 1.83 37.9107 48 91 2 35 232 36 36 1.83 38.1193 49 91 4 39 250 32 92 1.83 41.373 50 92 23 24 225 3 42 1.83 42.1013 51 91 93 45 225 6 25 1.83 42.0937 52 91 22 14 223 58 32 1.83 45.6173 53 90 35 33 240 18 57 1.83 33.3463 54 89 59 26 244 35 26 1.83 35.5377 55 89 43 14 247 28 34 1.83 33.187 56 89 14 32 251 56 33 1.83 34.012 57 89 0 34 254 41 15 1.83 31.3773 58 88 38 30 259 17 25 1.83 32.8307 59
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