Surveying(questions and answers)graded A+

SurveyingVertical Control - correct answer A series of benchmarks of known elevation established throughout a project Elevation - correct answer The vertical distance from a datum to a point, usually measured from mean sea level. Differential Leveling - correct answer Measure the vertical distance from a known elevation to the height of instrument, and then from the height of instrument to an unknown point. Back-sight (BS) - correct answer A measurement taken from the instrument to a Philadelphia Rod which will be set up over a point of known elevation. Fore-sight (FS) - correct answer A measurement taken from the instrument to a Philadelphia Rod which is set up over a point whose elevation is not known. Height of Instrument (HI) - correct answer A numerical value which is calculated by adding the back-sight center wire rod reading to the elevation of your known point (BS + Elev). Leveling Operation: Step 1 - correct answer Instrument set-up. Should be set-up where the distance between the BS and FS is less than 10'. Distance Formula using Stadias - correct answer [(top stadia - center stadia) + center stadia - bottom stadia)] * 100 = Distance Leveling Operation: Step 2 - correct answer Take Philadelphia Rod Reading and calculate distance. Leveling Operation: Step 3 - correct answer Verify Stadia checks are within 0.01' of each other. Then calculate HI. (BS + Elev)