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ice rise | 冰隆，浮现冰
| A mass of ICE resting on ROCK and surrounded either by an ICE SHELF or partly by an ICE SHELF and partly by SEA. No ROCK is exposed and the... more | 置于礁石上的，被冰架或者部分被冰架和部分被海水所围绕的冰块。如果没有礁石暴露出来，那么它也不会出现在海平面上方。浮现冰通常呈现圆顶形状的表面。已知的最大浮现冰大约有100km宽。 |
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ice sheet | 冰盖，冰原
| A continuous mass of ICE and SNOW of considerable thickness and large area. Ice sheets may be resting on ROCK (see INLAND ICE SHEET) or floa... more | 具有相当大的厚度和范围的连绵的冰和雪。冰原可以处于岩石上（参见inland ice sheet（内陆冰原））或者呈漂浮状态（参见ice shelf（冰架））。小于4万平方千米，且处在岩石上的冰原称为冰盖。 |
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ice shelf | 冰架
| A floating ICE SHEET of considerable thickness. Ice shelves are usually of great horizontal extent and have a level or gently undulating su... more | 具有相当大厚度的漂浮的冰原。冰架通常水平范围很大，具有平整的或略呈波浪状的表面。冰架由本地雪的堆积和陆地冰川向海一侧延伸而增长。冰架的极限边缘可以是陆地，冰架表面高出海平面不足2米时的初始阶段称为湾冰。向海的边缘称之为冰崖面。 |
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ice storm | 冰暴
| Intense formation of ICE on objects by the freezing, on impact, of drops of RAIN or DRIZZLE. | 雨点或毛毛细雨在急剧冻结时所形成的大量降冰现象。 |
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ice wall | 冰壁，冰栅
| An ice cliff forming the seaward margin of an INLAND ICE SHEET, ICE PIEDMONT or ICE RISE. The rock basement may be at or below SEA LEVEL. Se... more | 构成内陆冰、冰麓或冰隆向海一侧边缘的冰峭壁。它的岩基可以位于或低于海平面。参见ice front（冰壁）。 |
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identification beacon | 基准位置识别标，识别指向标
| See BEACON. | 一种发射编码信号的航空标或无线电信标或灯标，借助所发编码可以识别某一特定的参考点。 |
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IEC | 国际电工委员会
| International Electrotechnical Commission | 国际电工委员会。 |
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igneous rock | 火成岩
| ROCK formed by solidification of molten material or MAGMA. | 由融化的物质或岩浆凝固而形成的岩石。 |
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illuminated contours | 晕渲轮廓线，晕渲，光影等高线
| An application of ILLUMINATED RELIEF in which CONTOURS appear lighter on illuminated SLOPES and darker on the shadow SLOPES. | 一种晕渲地貌表示方法。此时轮廓线在向阳的坡面上以较亮的亮度显现，而在背阳的坡上则以较暗的亮度显现。 |
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illuminated relief | 晕渲地貌、光影地貌
| The representation of RELIEF with the appearance of lighting from one or more directions, giving a three-dimensional impression. Also called... more | 由来自一个或多个方向的光线照射来反映地貌，以得到三维的地貌效果。亦称shaded relief（晕渲地貌）。 |
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illumination (at a point of a surface) | 照度（表面上的一点）
| Quotient of the LUMINOUS FLUX incident on an infinitesimal element of the surface containing the point under consideration, by the area of... more | 照射在表面上（包含要研究的点）某一微元处的光通量与该微元面积的比。 |
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image | 像片，影像，图像
| The optical counterpart of an object. | 物体的光学对应体。 |
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image: erect | 正像
| An IMAGE that appears upright or in the same relative position as the object. | 直立的或者相对位置同地物相同的影像。 |
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image: inverted | 倒像
| An IMAGE that appears upside down in relation to the object. | 相对物体颠倒显示的图像。 |
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image: real | 实像
| An IMAGE actually produced and capable of being shown on a surface, as in a CAMERA. | 真实产生并能显示在表面上的影像。如同在照相机中的一样。 |
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image: virtual | 虚像
| An IMAGE that cannot be shown on a surface but is visible, as in a MIRROR. | 不能显示在表面上，但可以看见的影像，如同在镜子中一样。 |
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image point | 像点
| In PHOTOGRAMMETRY, the IMAGE on a PHOTOGRAPH corresponding to a definite object on the GROUND. | 在摄影测量中，与地面上某一确定地物相对应的照片上的影像。
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imagery | 成像
| Techniques to obtain, process or interpret images created by different types of radiation, e.g. light, infrared, x-rays. | 获取、处理或者解译各种类型辐射所生成的影像的技术，例如可见光、红外、X射线等。
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impedance | 阻抗
| The total opposition offered to an alternating current. It may consist of any combination of resistance, inductive reactance, or capacitive... more | 对交流电总的阻碍作用。它可以包括电阻、感抗、容抗的任意组合。 |
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impersonal micrometer | 超人差测微器
| See MICROMETER: TRANSIT. | 参见transit micrometer（子午仪测微器）。 |