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	Term	术语	Definition	定义
	field examination	外业检查	A special purpose hydrographic, wire drag, or side scan sonar survey of very limited area; i.e., usually an investigation of one or more ind... more A special purpose hydrographic, wire drag, or side scan sonar survey of very limited area; i.e., usually an investigation of one or more individual and scattered items.	一种特定目的的海道测量，利用钢丝扫测或者侧扫声呐测量非常有限的区域；例如通常用于调查一个或者�... more 一种特定目的的海道测量，利用钢丝扫测或者侧扫声呐测量非常有限的区域；例如通常用于调查一个或者多个单独的或者分散的要素。
	field inspection	外业调绘，野外检查	In PHOTOGRAMMETRY, the process of comparing AERIAL PHOTOGRAPHS with conditions as they exist on the GROUND, and of obtaining information t... more In PHOTOGRAMMETRY, the process of comparing AERIAL PHOTOGRAPHS with conditions as they exist on the GROUND, and of obtaining information to supplement or clarify that not readily discernible on the PHOTOGRAPHS themselves.	在摄影测量中，指将航空影像与实地情况比较和获取相关补充信息以及识别影像上不易辨别的特征的过程�... more 在摄影测量中，指将航空影像与实地情况比较和获取相关补充信息以及识别影像上不易辨别的特征的过程。
	field position	初算位置（起始位置），外业计算位置	See POSITION.	在外业测量工作实施过程中计算的位置，用来确定观测数据是否满足要求或者提供初始位置以用于其它目�... more 在外业测量工作实施过程中计算的位置，用来确定观测数据是否满足要求或者提供初始位置以用于其它目的。
	field sheet	外业原图	The hydrographer's or topographer's work sheet; it presents a graphic display of all surface and subsurface features in the area being surve... more The hydrographer's or topographer's work sheet; it presents a graphic display of all surface and subsurface features in the area being surveyed. See also BOAT SHEET.	海道测量人员或者地形测量人员的工作图；它是测量区域所有表面以及表面以下要素的图形显示。参见boat ... more 海道测量人员或者地形测量人员的工作图；它是测量区域所有表面以及表面以下要素的图形显示。参见boat sheet（海测原图）。
	field stop	视场光阑	The physical element (such as an APERTURE STOP, DIAPHRAGM or lens periphery) of an OPTICAL SYSTEM which limits the field of view covered by ... more The physical element (such as an APERTURE STOP, DIAPHRAGM or lens periphery) of an OPTICAL SYSTEM which limits the field of view covered by the system.	光学系统的物理器件，（就像孔径光阑，隔板或者镜头外围）用来限制视场范围。
	field work	外业	All activities in the field required for a hydrographic survey.	实施某一海道测量需要进行的所有野外作业。
	figure of the earth	地球形状	The defining elements of the mathematical surface which approximates the surface of the GEOID. The figure of the earth has been proved to be... more The defining elements of the mathematical surface which approximates the surface of the GEOID. The figure of the earth has been proved to be approximately an OBLATE SPHEROID. See also GEOID and SPHEROID.	形状近似于大地水准面的数学表面的定义元素。已经证明地球形状接近于一个扁状椭球体。亦可参见geoid(�... more 形状近似于大地水准面的数学表面的定义元素。已经证明地球形状接近于一个扁状椭球体。亦可参见geoid(大地水准面)和spheroid(旋转椭球体)。
	file	文件	An entity of data for a specific task or purpose stored on a mass storage device.	1、存储在大容量存储设备上的用于特定目的或者任务的数据实体。 2、在ECDIS中，指用于特定目的的可识�... more 1、存储在大容量存储设备上的用于特定目的或者任务的数据实体。 2、在ECDIS中，指用于特定目的的可识别的S-57记录集合。文件的内容和机构必须由产品规范定义。
	filter	滤光片	In optics, any transparent material which, by absorption, selectively modifies the light transmitted through an OPTICAL SYSTEM. In ocean-w... more In optics, any transparent material which, by absorption, selectively modifies the light transmitted through an OPTICAL SYSTEM. In ocean-wave forecasting, a set of formulas that define the particular wave frequencies and directions in the fetch area which are of significance at the point of forecast.	在光学中，指一种透明材料，它可选择性地通过所需波长的光波而吸收其它不需要波长的光波。滤波：在... more 在光学中，指一种透明材料，它可选择性地通过所需波长的光波而吸收其它不需要波长的光波。滤波：在海浪预报中，指用来确定海浪区波浪频率和传播方向的一组公式，它们在海浪预报中是很重要的。
	filtering	滤波；滤除	The process of selecting specific data from a specific source in accordance with certain rules, formulae, or algorithms.	根据一定的规则、公式或者算法，从某一具体数据源中选择特定数据的过程。
	final great circle course	最终大圆航行	See COURSE: GREAT CIRCLE.	参见great circle course（大圆航线）。
	fiord (or fjord)	峡湾	A long narrow ARM OF THE SEA, running up between high BANKS or CLIFFS, as on the COAST of Norway. Often has a relatively shallow SILL ac... more A long narrow ARM OF THE SEA, running up between high BANKS or CLIFFS, as on the COAST of Norway. Often has a relatively shallow SILL across its ENTRANCE.	在高岸堤或者峭壁之间的狭长的海湾，正如挪威的海岸。通常在口门处有深度较浅的水下陡坎。
	firn	冰川雪,永久冰雪	Old SNOW which has become granular and dense under the action of various processes of melting and refreezing, also including sublimation.	经融化、再冰冻、升华等各种过程而形成的颗粒状的、密实的陈雪。
	first nodal point	第一节点	See NODAL POINT.	参见nodal point（节点）。
	first order triangulation	一等三角测量	See TRIANGULATION CLASSIFICATION.	参见triangulation classification（三角测量）。
	first point of Aries	春分点	See EQUINOX.	参见equinox（二分点）。
	first point of Cancer	夏至点	See SOLSTICE.	参见solstice（二至点）。
	first point of Capricorn	冬至点	See SOLSTICE.	参见solstice（二至点）。
	first point of Libra	秋分点	See EQUINOX.	参见equinox（二分点）。
	first quarter	上弦	See PHASES OF THE MOON.	参见phase of the moon（月相）。
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