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Reduced level
Reduced Level in surveying refers to equating elevations of survey points with reference to a common assumed datum. It is a vertical distance between survey point and adopted datum plane.〔(【引用サイトリンク】 title=Reduced Level explanation )〕 Thus it is considered as the base elevation which is used as reference to reckon heights or depths of other important places.〔Tides and Currents. http://tidesandcurrents.noaa.gov/datum_options.html〕 Reduced here means equating and Level means Elevations. Datum may be real or imaginary location with a nominated elevation of straight zero.〔(【引用サイトリンク】 title=Reduced Level definition )〕
==Datum used==
The most common and convenient datum which is internationally accepted is mean sea level. Countries take their nearby sea levels as datum planes for calculations of Reduced levels . For example Pakistan takes sea near Karachi as its datum while India takes sea near Mumbai as its datum for calculation of Reduced levels of different places in their respective countries. The term Reduced Level is denoted shortly by ‘RL’. National survey departments of each country determines RL’s of significantly important locations or points. These points are called as ''permanent benchmarks'' and this survey process is known as Great Trigonometrical Surveying (GTS). The permanent bench marks act as reference points for determining RL’s of other locations in a particular country.〔(【引用サイトリンク】 title=Datum of India and Pakistan )〕〔(【引用サイトリンク】 title=Datum Surface )〕
〔(【引用サイトリンク】 title=Tides and Currents )〕
〔(【引用サイトリンク】 title=MSL of India )〕〔(【引用サイトリンク】 title=GTS benchmarks of India and Pakistan )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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