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Term 术语 Definition 定义
levelling plate
尺垫
A plate designed to support the LEVEL­LING ROD as an aid to ACCURACY in LEVELLING.
支撑水准尺的垫子，用于辅助精确水准测量。
levelling rod
水准尺
A straight rod or bar, designed for use in measuring a vertical distance between a point on the ground and the LINE OF COLLIMATION of a LEVE... more
A straight rod or bar, designed for use in measuring a vertical distance between a point on the ground and the LINE OF COLLIMATION of a LEVELLING INSTRUMENT which has been adjusted to horizontal position. Also called levelling staff.
一种直杆或直棒，用于测量地面点和已调整至水平位置的水准仪照准线之间的垂直距离。也称为levelling staff（水准标尺）。
levelling screw
水准螺旋
One of the three screws of surveying and astronomic instruments used for levelling same. Also called footscrew.
测量仪器或天文仪器三个脚螺旋之一，均用于调整水平。也称为footscrew（脚螺旋）。
levelling staff
水准标尺
See LEVELLING ROD.
参见levelling rod（水准尺）。
level net
水准网
Lines of SPIRIT LEVELLING connected together to form a system of loops and circuits extending over an area. Also called survey net.
水准测量路线相连接在一起形成的环状系统，覆盖整个测区。也称为 survey net（测量网）。
level surface
水准面
A surface which, at every point, is perpendicular to the DIREC­TION OF GRAVITY. A level surface is an EQUIPOTENTIAL SURFACE. The GEOID or, i... more
A surface which, at every point, is perpendicular to the DIREC­TION OF GRAVITY. A level surface is an EQUIPOTENTIAL SURFACE. The GEOID or, in general, any surface parallel to it, is a level sur­face. If changes in ELEVATION due to TIDES, WINDS, etc. are neglected, the surface of the SEA is a level surface. A level surface is not a plane surface, but it is sometimes so regarded in SURVEYS of limited areas.
每一点均垂直于重力方向的平面。水准面是一个等位面。通常大地水准面或者任何平行于它的面，即为水准面。如果忽略潮汐、风等对海面高度变化的影响，则海平面是一个水准面。一个水准面并不是一个平面，但在测量有限区域时可视为平面。
librations of moon
月视振动
Motions of the MOON due to which certain margins round the MOON's LIMB occasionally pass out of view while a cor­responding margin on the ot... more
Motions of the MOON due to which certain margins round the MOON's LIMB occasionally pass out of view while a cor­responding margin on the other side comes into view. The librations enable 59 per cent of the MOON's surface to be seen at one time or another.
由于月球的运动，月球边缘某处偶尔看不见，而另一边相应的边缘却可看见。月视振动使月亮的59%在某一刻或另一时刻可见。
lidar
激光测距仪
(LIght Detection And Ranging) An instrument that measures distance to a reflecting object by emitting timed pulses of LASER light and measur... more
(LIght Detection And Ranging) An instrument that measures distance to a reflecting object by emitting timed pulses of LASER light and measuring the time between emission and reception of reflected pulses.  The measured time interval is converted to distance.  In survey use, the lidar system usually scans the light PULSEs across the TRACK of the SURVEY platform (usually an aircraft) so that successive PULSEs cover a SWATH(E) either side of the platform's track.  Infra-red LASERS will reflect off land and water, and are normally used for TOPOGRAPHIC lidar SURVEYs.  Blue-green LASERS will penetrate water and are used in HYDROGRAPHIC lidar SURVEYs.
（激光雷达）通过发射计时脉冲到反射目标并测定脉冲发射和接收之间的时间间隔来测量距离的仪器。测量时间间隔转换为距离。在测量中使用时，雷达系统通常在测量平台（通常为飞机）航迹线方向扫描光脉冲，这样连续脉冲会覆盖平台航迹线两侧的狭窄的条带。近红外激光会被陆地和水反射，通常用于地形激光测... more
（激光雷达）通过发射计时脉冲到反射目标并测定脉冲发射和接收之间的时间间隔来测量距离的仪器。测量时间间隔转换为距离。在测量中使用时，雷达系统通常在测量平台（通常为飞机）航迹线方向扫描光脉冲，这样连续脉冲会覆盖平台航迹线两侧的狭窄的条带。近红外激光会被陆地和水反射，通常用于地形激光测量。蓝绿激光能穿透水体，用在海道激光测量中。
life buoy
救生圈
See BUOY.
可以保持人漂浮的救生工具。也称之为life jacket。
life saving station
救生站
A place where equipment for saving life at SEA is maintained. Also called rescue station.
装备有海上救生设备的场所。也称为 rescue station。
light
航标灯
A luminous or lighted AID TO NAVIGATION. For internationally agreed abbreviations of light characteristics see the International Chart Speci... more
A luminous or lighted AID TO NAVIGATION. For internationally agreed abbreviations of light characteristics see the International Chart Specifica­tions.
发光的或者照明的助航设备。 国际上有统一的灯质缩写编码。
light: aerial obstruction
航空障碍灯
LIGHT marking an obstacle which constitutes a danger to AIR NAVIGATION.
标志航空危险障碍物的灯。
light: aeromarine
海上航空灯
A marine-type LIGHT in which a pro­portion of the BEAM is deflected to an angle of 10°-15° above the HORIZON for the use of aircraft.
一种用于飞机导航的海上灯标，其部分光束能在地平线上偏转10到15度。
light: aeronautical ground
 NULL
Any LIGHT specially provi­ded as an AID TO NAVIGATION, other than a LIGHT dis­played on an aircraft.
 NULL
light: alternating
变色灯
A signal LIGHT that shows, in any given direction, two or more colours in a regularly repeated sequence with a regular periodicity.
在任一指定方向周期性重复显示两种或两种以上颜色的信号灯。
light(s): boundary
边界灯
LIGHTS marking the BOUNDARY of a LANDING AREA.
用于标识着陆区域边界的灯。
light: catoptric
反射灯
A LIGHT concentrated into a narrow BEAM by means of one or more REFLECTORS (as opposed to DIOPTRIC).
利用一个或多个反射器将光汇聚成一狭窄光束（与屈光灯相反）。
light: composite group-flashing
混合联闪光
A flashing light in which a sequence of groups of one or more flashes, which are specified in number, is regularly repeated, and the groups ... more
A flashing light in which a sequence of groups of one or more flashes, which are specified in number, is regularly repeated, and the groups comprise different numbers of flashes.
一个周期中相继出现几个不同闪光次数的闪光组的联闪光。
light: composite group-occulting
混合联明暗光
An occulting light in which a sequence of groups of one or more eclipses, which are specified in number, is regularly repeated, and the grou... more
An occulting light in which a sequence of groups of one or more eclipses, which are specified in number, is regularly repeated, and the groups comprise different numbers of eclip­ses.
一个周期中相继出现几个不同熄灭次数的联明暗光。
light: continuous ultra quick
连续超急闪灯
A light showing 160 or more, usually 240 to 300, flashes per minute.
每分钟闪160次或更多次的灯，通常240-300次。