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10.3 水平面上的方位角

10.3 水平面上的方位角. 兩種主要的方位角. 羅盤方位角 Compass bearing. 真方位角 True bearing. A. 羅盤方位角. N. W. E. O. N. E. S. B. 羅盤方位角. N. W. E. O. S. W. S. A. 真方位角. N. O. B. 真方位角. N. O. C. 真方位角. N. O. Ｄ. 求由 O 測得 D 的方位角. Ｎ. Ｏ. Ｄ. Ｎ. 羅盤方位角 真方位角. Ｏ. N. C. A. D. 例六.

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10.3 水平面上的方位角

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  1. 10.3 水平面上的方位角

  2. 兩種主要的方位角 • 羅盤方位角Compass bearing • 真方位角True bearing

  3. A 羅盤方位角 N W E O N E S

  4. B 羅盤方位角 N W E O S W S

  5. A 真方位角 N O

  6. B 真方位角 N O

  7. C 真方位角 N O

  8. Ｄ 求由O測得D的方位角 Ｎ Ｏ

  9. Ｄ Ｎ 羅盤方位角 真方位角 Ｏ

  10. N C A D 例六 在圖中, ∠CAB = 72°, ∠ACB = 43°。如果由 A 測得 C 的羅盤方位角是 N12°E , 求下列的羅盤方 位角。 • 由 A 測 B • 由 C 測 B P • (a) ÐPAB = 12° + 72 = 84由A測得B的羅盤方位角是 N84E。 • (b) ÐACD = ÐPAC = 12 • ÐDCB = 43 - 12 =31由C測得B的羅盤方位角是 S31E。 B

  11. N N C B 79° A 例七 在圖中, 由C測得A和B的真方位角分別是211°和 152°, 由A測得B的真方位角是079°, 求△ABC內各角的大小。 ÐACB = 211 - 152°= 59 ° • = 360 - 211 =149  +  = 180  = 180 - 149 = 31 α  ÐBAC = 79° -  = 79° - 31 = 48 β ÐCBA = 180 - 59 - 48 = 73

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