æ以ä¸å ç§æ¹ä½è§ï¼
ï¼1ï¼çæ¹ä½è§ãæç¹æååæçæ¹å线å«çåæ¹å线ï¼èç»çº¿ï¼ä¹å«çåå线ã
ããç±çåå线æ¹åçå端起ï¼
顺æ¶ééå°ç´çº¿é´ç夹è§ï¼ç§°ä¸ºè¯¥ç´çº¿ççæ¹ä½è§ï¼ä¸è¬ç¨A表示ãé常å¨ç²¾å¯æµéä¸ä½¿ç¨ã
ããï¼2ï¼ç£æ¹ä½è§ãå°çæ¯ä¸ä¸ªå¤§ç£ä½ï¼å°ççç£æä½ç½®æ¯ä¸æååç
ãã çæ¹ä½è§ï¼æç¹æåç£åæçæ¹å线å«ç£åæ¹å线ï¼ä¹å«ç£åå线ãå¨
å°å½¢å¾åãåå¾å»ä¸çç£åãç£å两ç¹é´çç´çº¿ï¼ä¸ºè¯¥å¾çç£åå线ãç±ç£åå线æ¹åçå端起ï¼é¡ºæ¶ééè³ç´çº¿é´ç夹è§ï¼ç§°ä¸ºè¯¥ç´çº¿çç£æ¹ä½è§ï¼ç¨Am表示ã
ããï¼3ï¼
åæ æ¹ä½è§ãç±åæ 纵轴æ¹åçå端起ï¼é¡ºæ¶ééå°ç´çº¿é´ç夹è§ï¼ç§°ä¸ºè¯¥ç´çº¿çåæ æ¹ä½è§ï¼å¸¸ç®ç§°æ¹ä½è§ï¼ç¨a表示ã
ãçæ¹ä½è§ (True bearing)
ããææè§åº¦ä»¥æ£åæ¹è®¾ä¸º000°ï¼é¡ºæ¶é转ä¸ååçè§åº¦ä¸º360°ã
ããå æ¤ï¼
ããæ£åæ¹ï¼000°æ360°
ããæ£ä¸æ¹ï¼090°
ããæ£åæ¹ï¼180°
ããæ£è¥¿æ¹ï¼270°
ããç½çæ¹ä½è§ (Compass bearing)
ããæ£ååæ£åä½é¦è¦æ¹ä½ï¼æ£ä¸åæ£è¥¿ä¸ºæ¬¡è¦æ¹ä½ï¼å¨ä¸¤è
ä¹é´å
ãã æ¹ä½è§çå
·ä½ç¨æ³ä¸è§åº¦ãå æ¤è§åº¦åªä¼ç± 0Â°è³ 90°ãå æ¤ï¼
ããæ£åæ¹ï¼ N0°W æ N0°E
ããæ£ä¸æ¹ï¼ N90°E æ S90°E
ããæ£åæ¹ï¼ S0°W æ S0°E
ããæ£è¥¿æ¹ï¼ N90°W æ S90°W
ããåè¥ä¸¤è
å ä¸ä¸ç®æ çè·ç¦»ï¼å°±ä¼æ为æåæ ï¼ç´è§åæ ç³»ï¼
ç¬å¡å°åæ ç³»ï¼ä»¥å¤çå¦ä¸ç§åæ ç³»ç»ã
ã1ãæç»å®çåæ æ°æ®è®¡ç®æ¹ä½è§Î±BAãαBP
ããÎxBA=xA-xB=+123.461m
ããÎyBA=yA-yB=+91.508m
ããç±äºÎxBA>0ï¼ÎyBA>0
ããå¯ç¥Î±BAä½äºç¬¬â
象éï¼å³
ããαBA=arctg =36°32'43.64"
ããÎxBP=xP-xB=-37.819m
ããÎyBP=yP-yB=+9.048m
ããç±äºÎxBP<0ï¼ÎyBP>0
ãã å
¬å¼è®¡ç®åºæ¥çæ¹ä½è§å¯ç¥Î±BPä½äºç¬¬â
¡è±¡éï¼
ããαBP=180o-α=180o-arctg=180o-13o27'17.33"=166°32'42.67"
ããæ¤å¤ï¼å½Îx<0ï¼Îy<0ï¼ä½äºç¬¬â
¢è±¡éï¼æ¹ä½è§=180°+ arctg
ããå½Îx>0ï¼Îy<0ï¼ä½äºç¬¬â
£è±¡éï¼æ¹ä½è§=360°+ arctg2ã计ç®æ¾æ ·æ°æ®â PBAãDBP
ããâ PBA=αBP-αBA=129°59'59.03"
ãã3ãæµè®¾æ¶ï¼æ
ç»çº¬ä»ªå®ç½®å¨Bç¹ï¼çåAç¹ï¼æ顺æ¶éæ¹åæµè®¾â PBAï¼å¾å°BPæ¹åï¼æ²¿æ¤æ¹åæµè®¾æ°´å¹³è·ç¦»DBPï¼å°±å¾å°Pç¹çå¹³é¢ä½ç½®ã
ããå½åå°å½¢éå¶ä¸ä¾¿äºéè·æ¶ï¼å¯éç¨è§åº¦äº¤ä¼æ³æµè®¾æ¾æ ·ç¹å¹³é¢ä½ç½®
ããä¸ä¾ä¸ï¼å½BPé´éè·åéæ¶ï¼éè¿è®¡ç®æµè®¾â PABãâ PBAæ¥å®Pç¹
ããæ ¹æ®ç»å®åæ 计ç®â PAB
ããÎxAP=xP-xA=-161.28m
ããÎyAP=yP-yA=-82.46m
ããαAP=180°+arctg =207°4'47.88"
ããåαAB=180°+αBA=180°+36°32'43.64"=216°32'43.64"
ããâ PAB=αAB-αAP=9°27'55.76"
æåé纳ï¼è°¢è°¢~