Table 5.13 -- EDCS classifications whose label begins with I
| Label | Definition | Code |
| ICE | Frozen <WATER>; ice. | 529 |
| ICE_BOOM | A floating <BARRIER> constrained by <ANCHOR>s and used to deflect the path of floating <ICE> in order to prevent the obstruction of <HYDROGRAPHIC_LOCK>s or <WATER_INTAKE>s or to prevent damage to <BRIDGE_PIER>s or other <STRUCTURE>s; an ice boom. | 530 |
| ICE_CLIFF | A perpendicular or steep face of a <GLACIER> or <ICE_SHELF> of considerable <<HEIGHT>>; an ice cliff. | 531 |
| ICE_FIELD | A large <REGION> that is permanently covered by <ICE>; an ice field. | 532 |
| ICE_GLAZE | A coating of <ICE>, generally clear and smooth, formed on exposed <OBJECT>s by the freezing of a film of supercooled <WATER> deposited by <RAIN>, <DRIZZLE>, or <FOG> or possibly condensed from supercooled water vapour; ice glaze. <ICE_GLAZE> is denser, harder, and more transparent than either <RIME> or <HOAR_FROST>. | 533 |
| ICE_KEEL | An irregular, linear, downward extension of <ICE> formed where two moving masses of <ICE> collide on a <WATER_BODY>; an ice keel. | 534 |
| ICE_PEAK | A rocky peak that may be perpetually covered with <ICE> and that projects above a surrounding <ICE_FIELD>; a nunatak or ice peak. | 535 |
| ICE_PELLETS | <SOLID_PRECIPITATION> of transparent or translucent <PARTICLE>s of <ICE> that are spherical or irregular, rarely conical, and that have an <<OUTSIDE_DIAMETER>> of 5 millimetres or less; ice pellets. <SMALL_HAIL> is a form of ice pellets. | 536 |
| ICE_SHELF | A thick sheet of <ICE>, mostly afloat, with a level or undulating <SURFACE> that is bounded on the seaward side by an <ICE_CLIFF> and attached to <LAND>; an ice shelf. | 537 |
| ICE_SLUDGE | Spongy whitish lumps of <ICE> a few centimetres in <<OUTSIDE_DIAMETER>> that are floating on the <WATER_BODY_SURFACE> of a shallow <SEA>; ice sludge. | 538 |
| ICEBERG | A very large mass of <ICE> floating loose in the <SEA> after becoming detached from a <GLACIER> or <ICE_SHELF>; an iceberg. | 539 |
| IFR_REGION | A <REGION> in which instrument flight rules (IFR) should be observed. | 540 |
| ILS_COMPONENT | An air navigation <COMPONENT> that is essential to the establishment and execution of a precision approach based on an ILS. | 541 |
| ILS_TERMINAL_COMPONENT | An <ATS_ROUTE_COMPONENT> designated for channelling the flow of air traffic via ILS terminal procedures. | 542 |
| INCINERATOR | A permanent <STRUCTURE> used for the disposal of waste products by burning; an incinerator. | 543 |
| INDIGENOUS_BURIAL_GROUND | A <CEMETERY> for native peoples, generally without <MEMORIAL_MONUMENT>s; an indigenous burial ground. | 544 |
| INDIGENOUS_PEOPLES_RESERVE | A <TRACT>and associated <STRUCTURE>s set apart specifically for the use of a native people; an indigenous peoples reserve. | 545 |
| INDIVIDUAL_FIGHTING_POSITION | A <FIGHTING_POSITION> designed to accommodate an individual soldier and that soldier's <EQUIPMENT>. | 546 |
| INDUSTRIAL_BUILDING | A <BUILDING> used for the manufacture of goods or the processing of <MATERIAL>s; an industrial building. | 547 |
| INDUSTRIAL_OVEN | A <STRUCTURE> used for hardening, burning, or heating substances such as grain, meal, clay, or wood; an industrial oven. | 548 |
| INDUSTRIAL_WORKS | The <STRUCTURE>s, <GROUNDS>, and <EQUIPMENT> of a manufacturing <FACILITY>; an industrial works. | 549 |
| INFANTRY_TRENCH | A <MILITARY_TRENCH>, typically integrated into a complex <SYSTEM> of <TERRAIN_OBSTACLE>s, that is used to provide cover, concealment, protected <FIGHTING_POSITION>s, and communications capability for infantry. | 550 |
| INFRARED_MATERIAL_PROPERTY_SET | A <PROPERTY_SET> describing the infrared properties of the <MATERIAL>s composing an <OBJECT>. | 551 |
| INLAND_SHORELINE | The <SHORELINE> of an inland <WATER_BODY>. | 552 |
| INLAND_WATER | A <WATER_BODY> that either does not or only minimally does experience tidal fluctuations; inland water. | 553 |
| INLAND_WATER_BOTTOM | A bathymetric <REGION> underlying an <INLAND_WATER_SURFACE>; an inland water bottom. | 554 |
| INLAND_WATER_ELEVATION | A <LOCATION> associated with an <INLAND_WATER_SURFACE> with an elevation value relative to a specified <SURFACE_DATUM>. | 555 |
| INLAND_WATER_SURFACE | The <WATER_BODY_SURFACE> of an <INLAND_WATER>. | 556 |
| INLET | A short, narrow <WATERCOURSE> connecting a <MARINE_BAY> or <LAGOON> with a <SEA>; an inlet. | 557 |
| INS_ALIGNMENT_PAD | A designated <LOCATION> where the automated INS instruments of <AIRCRAFT> are reset before taking-off; an INS alignment pad. | 558 |
| INSECT | An <ARTHROPOD> of the superclass Hexapoda, characterized by having six feet; an insect. | 559 |
| INSTITUTIONAL_FACILITY | A <FACILITY> housing an established organization or foundation, especially one dedicated to education, public service, or culture, that provides for the care of <HUMAN>s who are destitute, disabled, or mentally ill; an institutional facility. | 560 |
| INTEREST_SITE | A <SITE> maintained for the public and declared to be of national or provincial historical significance or interest. | 561 |
| INTERIOR_WALL | A <WALL> in a <BUILDING> separating two <ROOM>s from each other; an interior wall. | 562 |
| INTERIOR_WALL_OPENING | An opening (for example: an uncovered <APERTURE> in an <INTERIOR_WALL> or the space above a <WALL> of partial <<HEIGHT>>) that supports the passage of <MATERIAL>s or visibility into an adjoining <ROOM>. | 563 |
| INTERNATIONAL_DATE_LINE | A <LINE> designated as the place on the <EARTH> where each calendar day begins; the International Date Line. This <LINE> generally coincides with the 180th meridian but is modified to avoid <LAND>. | 564 |
| INTERPLANETARY_MAGNETIC_FIELD | The <MAGNETIC_FIELD> in a <SOLAR_SYSTEM> carried with its <STELLAR_WIND>. | 565 |
| INUNDATED_LAND | <LAND> subject to controlled inundation (for example: flooded by the regulation of the level of a <RESERVOIR>) that is normally associated with permanently flooded ground in which <TREE>s are still standing; inundated land. | 566 |
| INVERTEBRATE | An <ANIMAL> without a backbone or spinal column that does not belong to the subphylum Vertebrata; an invertebrate. | 567 |
| IONOSPHERE | The <COMPONENT> of the <ATMOSPHERE> of the <EARTH> characterized by ions and free electrons existing in sufficient quantities to reflect electromagnetic waves and located roughly between the <<ALTITUDE_MSL>>s of 70 to 500 kilometres; the ionosphere. | 568 |
| IONOSPHERE_ELECTRON_DENSITY- _PROPERTY_SET |
A <PROPERTY_SET> describing the electron-density related characteristics of an <IONOSPHERE>. | 569 |
| IONOSPHERE_SCINTILLATION- _PROPERTY_SET |
A <PROPERTY_SET> describing the distortion of the propagation of electromagnetic radiation through an <IONOSPHERE> due to medium density irregularities; an ionosphere scintillation property set. | 570 |
| IONOSPHERIC_D_REGION | The lowest daytime <REGION> of the <IONOSPHERE> characterized by weak concentrations of ions and located roughly between the <<ALTITUDE_MSL>>s of 50 and 90 kilometres; the D-region or D-layer. | 571 |
| IONOSPHERIC_E_REGION | A daytime <REGION> of the <IONOSPHERE> characterized by concentrations of O2+ and NO+ ions and located roughly between the <<ALTITUDE_MSL>> s of 85 and 140 kilometres; the E-region or E-layer. | 572 |
| IONOSPHERIC_F1_REGION | A daytime <REGION> of the <IONOSPHERE>, above the <IONOSPHERIC_E_REGION>, characterized by weak concentrations of O2+ions and located roughly between the <<ALTITUDE_MSL>>s of 120 and 200 kilometres; the F1-region or F1-layer. | 573 |
| IONOSPHERIC_F2_REGION | A daytime <REGION> of the <IONOSPHERE>, above the <IONOSPHERIC_E_REGION>, characterized by weak concentrations of O2+ions and located roughly between the <<ALTITUDE_MSL>>s of 200 and 1 500 kilometres; the F2-region or F2-layer. | 574 |
| IRRIGATION_DITCH | A <TRENCH> that is constructed for the purpose of irrigation or drainage; an irrigation ditch. | 575 |
| ISLAND | A <TRACT> smaller (usually much smaller) than a continent and surrounded by a <WATER_BODY>; an island. | 576 |
| ISOGONIC_LINE | An <ISOPLETH> that connects <LOCATION>s of equal magnetic variation; an isogonic line. | 577 |
| ISOPLETH | A <LINE> defined by <LOCATION>s for which some chosen quantity has the same value; an isopleth. | 578 |
| ISTHMUS | A <TERRAIN_STRIP> that is bordered on both sides by <WATER_BODY>s and that connects two larger bodies of <LAND>; an isthmus. | 579 |
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