Find the true bearing of the lines with the following observed magnetic bearings and declinations. (a) Bearing of line = N 45° 20′ E, Declination = 2° 15′ W (b) Bearing of line = S 15 °25′ E, Declination = 1° 10′ E Solutions : (a) magnetic bearing of line= N 43° 20′ E corresponding … Read more
Find the true bearing of the lines with the following observed magnetic bearings and declinations. (a) Bearing of line = 189°12. Declination = 2° W (b) Bearing of line = 72° 44′ Declination = 1° 12 ‘ E solutions : (a) True bearing of line= magnetic bearing of line – Declination (West) = 189° 12′ … Read more
Compute the back bearings for the following reduced bearings.(a) S 79° 04′ E(b)N 88°12’W (C) N 28° 12′ E (d) S 4° 12′ W SOLUTIONS : (a) The fore bearing = S 79’04 ‘E. back bearing of= N 79° 04’N. ( It is a opposite direction remaining value is same ) (b) The fore bearing … Read more
Find the back bearings of the following lines from the observed Fore Bearings:(a) 79° 24′(b) 354° 24′(c) 178 ° 4′(d) 204 ° 12′ solutions : (a) 79°24′ Fore bearing = 79° 24′ Back bearing = FB +180° ( as the FB is less than 180° ) = 79°24′ +180° = 259°24′ (b) 354°24′ Fore bearing= … Read more
Convert the Following whole circle bearing to quadrantal bearing : (a) 38°30′ (b) 142°15′ (C) 248°45′ (d) 325°30′ SOLUTIONS : (a) WCB = 38°30′ Rule: If WCB Is between 0° and 90 ° QB or RB = WCB = N 38°30’E (b) WCB= 142° 15′ Rule: If WCB Is between 90° and 180° Q B … Read more
Convert the following reduced bearings to whole circle bearings:(a) N 46° 30′ E(b) N60°30’W(c) S 80° 00′ E,(d) S 20°00′ W SOLUTIONS: ( a ) N 46° 30′ E Rule: For 1 Quadrant WCB Of = RB= 46° 30′ ( It is First Quadrant ) (b) S 80° 00′ E Rule : It is a … Read more
plot the following cross staff Survey of a field ABCDEFG and calculate its area in hectares Soultion: show the field ABCDEFG . The calculations of area are listed in the Following table S. NO figure chainage Base offset mean Offset Area Remark 1 ΔAQB o to 200 200 0 to 130 65 13,000 2. Trapezium … Read more
Plot the following cross-staff survey of a field and calculate its area in hectares. All distances noted in the field book are in metres solution : shows the plotting of field notes of the given area not to scale. The area Can be Found out in the Following manner. 1. Area of triangle AHB … Read more
Following figure shown a page in a field book of cross staff survey. Calculate the area enlarged between the stations: 1. Area of triangle AHD = 1 / 2 x 30 x 22.50 = 337.50 m² 2. Area of Trapezium HDFJ = ( 88.0-30.0) = ( 22.50+33.80/ 2 ) = 1632 . 70m² 3. … Read more
Q.A survey line ABC crossing a river at right angles cuts its banks at B and C. To determine width of river BC, a line BE, 30 m long was set out roughly parallel to the river. A point D was found in CE produced and middle point of DB determined, EF was then produced … Read more