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	Term	术语	Definition	定义
	altimetry	测高法	The process of determining the difference of ELEVATION by the use of ALTIMETERS.	使用高度计确定高差的过程。
	altitude	高程，高度	The vertical distance of a LEVEL, a POINT or an object considered as a POINT (but not affixed to the surface of the EARTH), measured from a ... more The vertical distance of a LEVEL, a POINT or an object considered as a POINT (but not affixed to the surface of the EARTH), measured from a given DATUM, usually MEAN SEA LEVEL. See also ELEVATION and HEIGHT.- 2. In ASTRONOMY, the vertical angle between the plane of the HORIZON and the line to a CELESTIAL BODY. See also ANGLE OF DEPRESSION and ANGLE OF ELEVATION.	1.从某一指定基准面（通常是海平面）测定的一点（或可视作一个点的物体）的垂直距离。亦可参见elevation... more 1.从某一指定基准面（通常是海平面）测定的一点（或可视作一个点的物体）的垂直距离。亦可参见elevation和height（高度）。 2.在天文学中，地平面与天体连线之间的垂直角。亦可参见angle of depression （俯角）和angle of elevation（仰角）。
	altitude: apparent	视高度	The SEXTANT ALTITUDE of a CELESTIAL BODY corrected for INDEX ERROR, DIP (HEIGHT of EYE), and (for SUN or MOON only) SEMIDIAMETER. Also calle... more The SEXTANT ALTITUDE of a CELESTIAL BODY corrected for INDEX ERROR, DIP (HEIGHT of EYE), and (for SUN or MOON only) SEMIDIAMETER. Also called rectified altitude.	指经过指标差、俯角（眼睛的高度）和半径（仅对太阳和月亮）改正后的天体六分仪高度。也称作rectified a... more 指经过指标差、俯角（眼睛的高度）和半径（仅对太阳和月亮）改正后的天体六分仪高度。也称作rectified altitude（视高度）。
	altitude: ex-meridian	近中天高度，近子午圈高度	An ALTITUDE of a CELESTIAL BODY near the CELESTIAL MERIDIAN of the observer, to which a CORRECTION is to be applied to determine the MERIDIA... more An ALTITUDE of a CELESTIAL BODY near the CELESTIAL MERIDIAN of the observer, to which a CORRECTION is to be applied to determine the MERIDIAN ALTITUDE. Also called circummeridian altitude.	位于观测者所在的天球子午圈附近的天体的高度。对近中天高度进行修正来确定中天高度值。也称为circumme... more 位于观测者所在的天球子午圈附近的天体的高度。对近中天高度进行修正来确定中天高度值。也称为circummeridian altitude（拱子午线高度）。
	altitude: flight	飞行高度，航高	The vertical distance above a given DATUM, usually MEAN SEA LEVEL, or an aircraft in flight.	飞机飞行时至某一基准面（通常是平均海平面）的距离。
	altitude: meridian	中天高度	The ALTITUDE of a CELESTIAL BODY when it is on the CELESTIAL MERIDIAN of the observer.	天体经过观测者天球子午圈时的高度。
	altitude: observed	观测高度	The SEXTANT ALTITUDE of a CELESTIAL BODY after all corrections (see ALTITUDE: APPARENT) have been applied. In American terminology the term ... more The SEXTANT ALTITUDE of a CELESTIAL BODY after all corrections (see ALTITUDE: APPARENT) have been applied. In American terminology the term is usually employed in the place of TRUE ALTITUDE.	经所有改正后的天体六分仪高度，参见apparent altitude（视高度）。在美国术语中，通常指真高度。
	altitude: rectified	视高度	See ALTITUDE: APPARENT.	参见apparent altitude（视高度）。
	altitude: sextant	六分仪高度	The ALTITUDE as indicated by a SEXTANT before CORRECTIONS are applied.	在进行改正之前六分仪所指示的高度。
	altitude: true	真高度	The APPARENT ALTITUDE of a CELESTIAL BODY after all corrections have been applied. In American terminology usually referred to as OBSERVED A... more The APPARENT ALTITUDE of a CELESTIAL BODY after all corrections have been applied. In American terminology usually referred to as OBSERVED ALTITUDE.	经过所有的改正之后的天体视高度。在美国，该术语通常称为observed altitude（观测高度）。
	altitude difference	高度差	See INTERCEPT.	参见截距（intercept）。
	altocumulus	高积云	See CLOUD GENERA.	参见cloud genera（云属）。
	altostratus	高层云	See CLOUD GENERA.	参见cloud genera（云属）。
	aluminium sheet	铝（图）板	An aluminium-mounted paper sheet occasionally used for BOAT-SHEETS, SMOOTH SHEETS, or plane table boards.	一种将纸裱贴在铝板上的图板，有时用于外业测量原图、印刷原图或平板仪图板。
	ambient noise	环境噪声	The erratic electromagnetic or sonic background noise emitted by natural or artificial sources contaminating the proper signal.	由自然或人工源发出的、干扰正常信号的无规律的电磁或背景噪声。
	ambiguity	模糊度，多义性	Uncertainty of value or meaning because of the possibility of two or more interpretations. The condition when navigational COORDINATES defin... more Uncertainty of value or meaning because of the possibility of two or more interpretations. The condition when navigational COORDINATES define more than one POSITION, DIRECTION, LINE OF POSITION, or SURFACE OF POSITION.	由于存在两种或两种以上解释的可能性，造成数值或含义的不确定性。例如，导航坐标定义一个以上的位�... more 由于存在两种或两种以上解释的可能性，造成数值或含义的不确定性。例如，导航坐标定义一个以上的位置、方向、位置线、位置面的情况。
	Amici prism	阿米西棱镜	A prism which deviates the RAYS of light through 90° and because of its shape inverts the IMAGE. See ROOF PRISM.	一种能折光90°并因为其形状能使图像呈倒像的棱镜。参见roof prism（脊形棱镜）。
	amidships	船中	At, near, or toward the middle of a ship.	在船的中部或接近船的中部处。
	ampere	安培	The unit of density of electric current in the SI SYSTEM.	国际单位制中的电流密度单位。
	amphidromic point	无潮点	A no-tide point, from which COTIDAL LINES radiate.	没有潮汐的点，等潮线由此向各个方向伸展。
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