Q1. Describe topographic control.

Q2. Assume that you are establishing the primary vertical control for a topographic survey. The terrain is level and the desired contour interval is 1 foot. What is the maximum error closure?

Q3. Can you use stadia leveling to achieve this error of closure?

Q4. You are detailing a point from a primary control station that has a known elevation of 174.3 feet. Your height instrument (h.i.) above the station is 5.6 feet. After reading a stadia interval of 2.45, you train the center hair of your telescope on the rod to match your h.i. and read a vertical angle of +6 36t. If the stadia constant is 100 and the instrument constant is 1, what is the (A) horizontal distance, (B) difference in elevation and (C) elevation of the detail point? (Use the exact stadia formulas.) Your transit equipped with a stadia arc, is set up at point A (elevation = 245.2 feet) and you are sighting on point B. Your h.i. is 4.3 feet. The line of sight is at 5.8 on the rod and the stadia reading is 6.43. The stadia arc has index marks of H = 0 and V= 50. The stadia arc readings are V = 63 and H = 12. Your stadia constant is 100 and the instrument constant is O. What is (A) the horizontal distance to point B and (B) the elevation of B?

Q5. Define contour interval.

Q6. On a topographic map, when a contour line closes on itself, what is being portrayed?