Table 5.12 -- EDCS Classifications whose label begins with I
| Label | Definition | Related concepts | Code |
| ICE_BOOM | A floating barrier, constrained by anchors, used to deflect the path of floating ice in order to prevent the obstruction of locks or intakes, and to prevent damage to bridge piers and other structures. | EC BOOM | 398 |
| ICE_CLIFF | The vertical face of a glacier or ice shelf. | EC GLACIER | 399 |
| ICE_FIELD | A large region of land or water that is permanently covered by ice. | EC SNOW_FIELD | 400 |
| ICE_KEEL | An irregular linear downward extension of sea ice formed where two moving masses of ice collide. | 401 | |
| ICE_PEAK | A rocky peak projecting above a surrounding ice field that may be perpetually covered with ice, e.g., a nunatak. | 402 | |
| ICE_SHELF | A thick sheet of ice with a level or undulating surface which is bounded on the seaward side by an ice cliff and attached to land, but mostly afloat. | EC ICE_CLIFF | 403 |
| IFR_REGION | A region in which instrument flight rules should be observed. | 404 | |
| ILS_TERMINAL_SGMT | A specific terminal route/segment designated for channelling the flow of traffic via ILS terminal procedures. | 405 | |
| INCINERATOR | A permanent structure used for the disposal of waste products by burning. | EC FLARE_PIPE | 406 |
| INDIGENOUS_PEOPLES_RESERVE | A tract of land set apart specifically for the use of a native people, including associated buildings. | 407 | |
| INDUSTRIAL_BUILDING | A building used for the manufacture of goods or the processing of materials. | 408 | |
| INDUSTRIAL_COMPLEX_HEAVY | A site and associated structures devoted to material processing or the manufacture of goods that generally require significant equipment, material, and energy inputs, e.g., steel, aluminum, glass, or automobiles. | EC FACTORY, EC INDUSTRIAL_COMPLEX_LIGHT | 409 |
| INDUSTRIAL_COMPLEX_LIGHT | A site and associated structures devoted to the manufacture of goods that generally require only limited material and energy inputs, e.g., electronic devices or software. | EC FACTORY, EC INDUSTRIAL_COMPLEX_HEAVY | 410 |
| INDUSTRIAL_WORKS | The structures, grounds, and machinery of a manufacturing establishment, or structures in engineering such as docks and bridges. | EC FACTORY | 411 |
| INFANTRY_TRENCH | Trench, typically integrated into a complex obstacle system, which is used to provide cover, concealment, protected fighting positions and communications capability for infantry. | 412 | |
| INLAND_SHORELINE | The land-water boundary for all inland hydrographic objects having shorelines, e.g., lakes, ponds, reservoirs, and islands. | EC INLAND_WATER | 413 |
| INLAND_WATER | A body of water that does not experience tidal fluctuations, e.g., a canal, lake, reservoir, or river. | EC WATER | 414 |
| INLAND_WATER_BOTTOM | A bathymetric region underlying an inland water surface. | EC INLAND_WATER | 415 |
| INLAND_WATER_ELEVATION | A location with a generalized elevation value relative to a vertical datum associated with an inland, usually confined, water body. | EC INLAND_WATER | 416 |
| INS_ALIGNMENT_PAD | A designated location where the automated INS instruments of aircraft are reset before taking-off. | 417 | |
| INSTITUTIONAL_FACILITY | A site and associated buildings housing an established organization or foundation, especially one dedicated to education, public service, or culture; e.g., a place for the care of persons who are destitute, disabled, or mentally ill. | 418 | |
| INTEREST_SITE | A site declared to be of national or provincial historical significance or interest, and maintained for the public. | 419 | |
| INTERNATIONAL_DATE_LINE | A line generally coinciding with the 180th meridian on the Earth, modified to avoid land, and designated as the place where each calendar day begins. | 420 | |
| INUNDATED_LAND | Land subject to controlled inundation (e.g., flooded by the regulation of the level of water impounded by a dam or beaver dam), and which is normally associated with permanently flooded ground in which trees are still standing; e.g. a flooded site or inundated land. | 421 | |
| IONOSPHERE | An electrically conducting set of layers of the planetary atmosphere, extending from altitudes of approximately 50 to 400 kilometres, caused by ionization of rarified atmospheric gases by incident solar radiation. | 422 | |
| IONOSPHERE_ELECTRON_DENSITY | The electron-related characteristics of the planetary ionosphere, e.g., electron density, vertical total electron count, or electron layer data such as critical frequencies and heights of the layers. | 423 | |
| IONOSPHERE_SCINTILLATION | The distortion of the propagation of electromagnetic radiation through the planetary ionosphere due to medium density irregularities. | 424 | |
| IR_MATERIAL_CHARSET | A set of infrared characteristics of the material composing an object, e.g., reflectivity. | 425 | |
| IRRIGATION_DITCH | A channel constructed for the purpose of irrigation or drainage, which is smaller than a canal. | EC CANAL, EC ENGINEER_DITCH | 426 |
| ISLAND | A land mass smaller (usually much smaller) than a continent and surrounded by water. | 427 | |
| ISOGONIC_LINE | A line that connects points of equal magnetic variation. | 428 |