Elevation of top Q of a hill, a staff of 2 m height was erected and observations were made from stations P and R, 60 m apart. The horizontal angle measured at P between R and the top of the flag staff was 60°30' and that measured at R between the top of the flag staff and P was 68°18'. The angle ofelevation to the top of the flag staff from P = 10°12' and from R = 10°48'. Staff readings on BM when instrument was at P = 1.965 m and that with instrument at R = 2.055 m. Calculate the elevation of the top of the hill if reduced level of BM=100m?

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State Plane Coordinate Systems

The state plane coordinate system (SPCS or SPS) is a collection of 124 coordinate systems or geographic zones prepared for particular regions of the U.S. Every state consists of one or more than one state plane zone, the boundaries of which generally follow the county lines. Inside the U.S., there are 110 zones in total, 10 more zones in Alaska, 5 in Hawaii, and 1 for Puerto Rico and US Virgin islands. The system is extensively used for geospatial and geographic data assembling by the state and local governments.