To map a cave, a team selects new stations or uses existent stations at crucial

Question

To map a cave, a team selects new stations or uses existent stations at crucial points in the cave and takes measurements between them. A measuring tape is used to determine distance between the stations, a compass is used to measure azimuth (clockwise degrees from north - northeast being 45 degree, east being 90 degree, etc), and an inclinometer is used to gauge the vertical angle between stations (with a positive angle being uphill and negative being downhill). Use the rough sketch at the right and the measurements given to complete the following questions. To confirm accuracy, often "backsight" readings are taken. Fill in the expected backsight readings. When drawing a two-dimensional map, the space between stations is determined by horizontal distance (which is usually not the same as measured distance). Calculate the horizontal distance (to tenths of a foot) between stations 0 and 3 and stations 0 and 5. horizontal distance Project the distance measurement and inclinometer reading from station 3 to station 5. 3 rightarrow 5: measured distance almostequalto/(nearest tenth) incline almostequalto/(nearest degree)

Explanation / Answer

26)

3 to 0.........Azimuth 76 and incline -2

5 to 0........Azimuth 157 and incline -23

27) 5 to 0.... Distance 24.6

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