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reduced latitude | 归化维度
| See LATITUDE: PARAMETRIC. | 参见parametric latitude（参量纬度）。 |
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reduction | 归算
| The process of substituting for an observed value one derived therefrom. | 从观测值导出可替代值的过程。 |
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reduction of soundings | 水深改正
| The CORRECTION of the observed DEPTHS, for the HEIGHT OF TIDE above or below the plane of reference at the TIME of SOUNDING. Usually the ter... more | 观测深度的潮汐改正，即加入参考平面上（或下）的潮汐高度改正。一般来说本术语只涉及潮汐改正，不涉及其他改正。参见correction of soundings（水深改正）、lead line correction （测深索改正）和tide reducer（潮高改正）。 |
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reduction of tides | 潮汐订正
| The processing of observed tidal data to obtain mean values of TIDAL CONSTANTS. | 对观测到的潮汐数据进行处理，以获得潮汐常数的平均值。 |
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reduction to centre | 归心计算
| The amount which must be applied to a DIRECTION observed at an ECCENTRIC STATION, or to an ECCENTRIC SIGNAL, to reduce such DIRECTION to wha... more | 加在偏心站观测方向或偏心信号的量，使这些方向经改正后成为无偏心率的量。 |
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reduction to sea level | 海平面归算
| A reduction applied to a measured horizontal length on the EARTH's surface to reduce it to the surface of the SEA LEVEL DATUM. | 把地球表面测得的水平长度加一改正数，将其化归到海平面基准面的表面上。 |
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reduction to the meridian | 子午订正，中天高度订正 | The process of applying a CORRECTION to an ALTITUDE observed when a body is near the CELESTIAL MERIDIAN of the observer, to find the ALTITUD... more | 当一天体位于观测者天球子午线附近的时候，为获得中天高度而对观测高度进行的改正。参看ex-meridian altitude（近中天高度）。 |
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reed horn | 簧喇叭，舌簧雾笛，雾角
| A HORN that produces SOUND by means of a steel reed vibrated by air under pressure. | 在空气压力下使钢簧片振动而发声的号笛。 |
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reef | 暗礁
| A mass of rock or coral which either reaches close to the sea surface or is exposed at low tide, posing a hazard to NAVIGATION. | 接近水面或在低潮时露出水面，构成了航行危险的礁石或珊瑚礁。 |
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reef flat | 礁坪，浅石滩
| A flat expanse of dead reef rock which is partly or entirely dry at LOW TIDE. | 低潮时部分或完全露出的大片平坦的危险礁区。 |
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reference direction | 基准方向
，参考方向 | A DIRECTION used as a basis for comparison of other DIRECTIONS. | 作为基准用作其他方向比对的方向。 |
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reference ellipsoid | 参考椭球
| See REFERENCE SPHEROID. | 参见reference spheriod（参考椭球体）。 |
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reference level | 参考水准面
| See DATUM: CHART and DATUM: VERTICAL CONTROL. | 参见chart datum（海图基准面）和vertical control datum（高程控制基准）。 |
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reference line | 控制线，参考线
| Any line which can serve as a reference or base for the measurement of other quantities. Also called datum line. | 能够用作参考或基准，测定其他量的任何线，亦称datum line（基准线）。 |
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reference mark | 参考标志
| In SURVEYING, a supplementary MARK of permanent character close to a STATION or to a BASE TERMINAL, to which it is related by an accurately ... more | 测量中在靠近测站或基线端点的地方补充设置的永久标识。通过精确的测距、测角和（或）高差测定，以确定彼此间的关系位置。 |
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reference object | 基准目标
| A well-defined object selected as a starting point in the DIRECTION METHOD OF OBSERVATION. | 在方向法观测中被明确选定为初始点的物体。 |
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reference plane | 参考平面
| See DATUM: CHART, and DATUM: VERTICAL CONTROL. | 参见chart datum（海图基准）和vertical control datum（垂直控制基准）。 |
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reference point | 控制点，参考点
| Any point which can serve as a reference or base for the measurement of other quantities. Also called datum point. | 作为参考或基准测定其他量的任何点。亦称datum point（基准点）。 |
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reference spheroid (or ellipsoid) | 参考椭球
| A theoretical figure whose dimensions closely approach the dimensions of the GEOID. The exact dimensions are determined by various conside... more | 尺寸极其接近于大地水准面的一种理论的地球形状，其精确尺寸由所考虑的地球表面的各种因素决定。各国大地测量采用的椭球体有：贝塞尔椭球、克拉克椭球、德兰椭球、艾弗勒斯椭球、海福特椭球和赫尔默特椭球。亦称spheroid of reference（参考椭球体）或ellipsoid of ... more |
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reference station | 参考（验潮）站，主港
| See STATION. | 通过观测以确定潮汐和潮流常数，并作为标准与附属站同步观测比较的地点。亦指在潮汐或潮流表中给出单独的每日预报资料的地点，根据此表可用差分法或倍乘因子法得到其它点位的相应预报资料。亦称为standard station和standard port（英式术语）。 |