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Term | 术语 | Definition | 定义 |
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dip of the horizon | 地平俯角
| See DIP. | 参见dip（倾角）。 |
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dipping compass | 倾度仪
| See DIP CIRCLE. | 参见dip circle（磁倾仪）。 |
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dipsey lead | 深水砣
| See LEAD: DEEP SEA. | 参见deep sea lead（深海测深锤）。 |
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direction | 方向
| In SURVEYING and mapping, the angle between a line or plane and an arbitrarily chosen REFERENCE LINE or PLANE. | 在测量和制图中，一条线或者一个平面同任意选定的参考线或者平面形成的角度。 |
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direction: base | 基线方向
| In PHOTOGRAMMETRY, the DIRECTION of the vertical plane containing the AIR BASE which might be expressed as a BEARING or an AZIMUTH. | 在摄影测量中，包含摄影基线的垂直平面的方向。可用方位或者方位角表示。 |
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direction: grid | 格网方向
| Horizontal DIRECTION expressed as ANGULAR DISTANCE from GRID NORTH. | 用自格网北的角距表示的水平方向。 |
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directional antenna | 定向天线
| See ANTENNA. | 按照指定的方向发送或者接收信号的天线。 |
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directional gyroscope | 定向陀螺仪
| See GYROSCOPE. | 能够在有限时间内指示预定水平方向的陀螺仪设备。它需要周期性复位，这取决于陀螺仪进动速率或者预期的艏向变化或者水平方向变化。 |
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directional (or directed) radiobeacon station | 定向无线电指向标
| A special type of radiobeacon station the emissions of which are intended to provide a definite TRACK for GUIDANCE. | 一种特殊的无线电指向标，其发射的无线电波用于为船舶航行提供明确的路线。 |
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direction finder | 定向仪
| See RADIO DIRECTION FINDER. | 参见radio direction finder（无线电测向仪）。 |
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direction (or directional) light | NULL | See LIGHT. | NULL |
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direction method of observation | 水平角方向观测法
| A method of observing angular relationships wherein the graduated CIRCLE is held in a fixed position, and the DIRECTIONS of the various SIGN... more | 一种观测角度关系的方法。使用方向观测法时，将度盘固定在某一位置，观测周围地面各种信号的方向。因此，角度是根据观测的各方向值计算其差值得到。 |
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direction of current | 流向 | The direction toward which a CURRENT is flowing, called the SET of the CURRENT. Also called current direction. | 某条洋流的流动方向。 |
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direction of gravity | 重力方向
| See GRAVITY. | 铅垂线指示的方向，同大地水准面表面垂直，也称为direction of the force of gravity（地心引力方向）。 |
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direction of movement of the waves | 波浪运动方向
| Direction from which the WAVES arrive at a fixed point. | 波浪到达某一固定点过程中移动方向。 |
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direction of relative movement | 相对运动方向
| See RELATIVE MOTION. | 参见relative motion（相对运动）。 |
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direction of the force of gravity | 地心引力方向
| See GRAVITY: DIRECTION OF. | 参见direction of gravity（重力方向）。 |
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direction of tilt | 倾斜方向
| The DIRECTION (AZIMUTH) of the PRINCIPAL PLANE of a PHOTOGRAPH. Also, the DIRECTION of the PRINCIPAL LINE on a PHOTOGRAPH. | 相片的主平面方向（方位）。也指一张相片主纵线方向。 |
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direction of traffic flow: established | 推荐总流向
| A traffic flow pattern indicating the directional movement of traffic as established within a traffic separation scheme. | 一种交通流形式，表示交通分道通航制中建立的交通移动方向。 |
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direction of traffic flow: recommended | 推荐交通流方向
| A traffic flow pattern indicating a recommended directional movement of traffic where it is impractical or unnecessary to adopt an establish... more | 一种交通流模式，用于在无法或没有必要建立交通流方向的地方指明交通流移动的推荐方向。 |