M点高程HM=43.251m,测得后视读数a=1.000m,前视读数b=2.28

考试题库2022-08-02  18

问题 M点高程HM=43.251m,测得后视读数a=1.000m,前视读数b=2.283m。则视线高Hi和待求点N的高程HN分别为(  )。A、45.534m;43.251m B、40.968m;38.685m C、44.251m;41.968m D、42.251m;39.968m

选项 A、45.534m;43.251m
B、40.968m;38.685m
C、44.251m;41.968m
D、42.251m;39.968m

答案 C

解析 视线高程是指视准轴到绝对基面的垂直高度。通过视线高推算出待定点的高程,视线高程=后视点高程+后视读数。待定点高程=视线高程-前视读数。代入数据可得:Hi=HM+a=43.251+1.000=44.251m,HN=Hi-b=44.251-2.283=41.968m。
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