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用途特点:如采用視距法施測水道地形或断面时,用普通地形尺,若豎尺在測船上,需一扶尺員,地形尺仅有一面尺面对准岸上仪器,当船旋轉时,扶尺者得随着調动尺面位置(尺面应永远对着岸上仪器)。如采用圓标尺它直接代替了地形尺,也不需扶尺的人了,船随其旋轉,仪器均能讀出距离。
Use features: If the use of line-of-sight method to measure the waterway topography or section, the use of ordinary terrain, if the ruler on the survey ship, the need for a Fumaru staff, terrain ruler only one side of the surface aligned to shore equipment, when the ship is rotating , Fu-man who have to mobilize the ruler with the location (ruler should always be facing the shore instruments). Such as the use of round ruler it directly replaced the terrain ruler, nor the person who helped the ruler, the ship with its rotation, the instrument can read the distance.