In surveying a construction alignment, why should the I angle be measured using both faces of the instrument? A highway curve (are definition) to the right, having R = 550 m and I = 18 degree 30', will be laid out by coordinates with a total station instrument setup at the PI. The PI station is 3 + 855.2CX) m, and its coordinates are X = 65, 304.654 m and Y = 36,007.434 m. The azimuth (from north) of the back tangent proceeding toward the PI is 48 degree 17'12". To orient the total station, a back sight will be made on a POT on the back tangent. Compute lengths and azimuths necessary to stake the curve at 30-m stations. In Problem 24.27, compute the XY coordinates at 30-m stations. An exercise track must consist of two semicircles and two tangents, and be exactly 1000 m along its centerline. The two tangents are 100.000 m each. Calculate the radius for the curves. What sight distance is available if there is an obstruction on a radial line through the PI inside the curves in Problems 24.30 and 24.31? For Problem 24.7, obstacle 15 ft from curve. For Problem 24.12, obstacle 10 m from curve. If the disclosure for the curve of Problem 24.7, computed as described in Section 24.8, is 0.12 ft, what is the field layout precision? Assume that a 100-ft entry spiral will be used with the curve of Problem 24.7 Compute and tabulate curve notes to stake out the alignment from the TS to ST at full stations using a total station and the deflection-angle, total chord method. Same as Problem 24.33, except use a 200-ft spiral for the curve of Problem 24.8. Same as Problem 24.33, except for the curve of Problem 24.9, with a 50-m entry spiral using stationing of 30 m and a total station instrument. Compute the area bounded by the two arcs and tangent in Problem 24.24. In an as-built survey, the XY coordinates in meters of three points on the centerline of a highway curve are determined to be A: (3770.52, 4913.84); B: (3580.80, 4876.37); C: (3399.27, 4809.35). What are the radius, and coordinates for the center of the curve in meters? In Problem 24.37, if the (x, y) coordinates in meters of two points on the centerline of the tangents are (3042.28, 4616.77) and (4435.66, 4911.19), what are the coordinates of the PC, PT, and the curve parameters L, T, and/?
