Table 6.13 — EAs whose label begins with I

Label Concept definition Attribute value type EQ label Code
ICAO_AIRSPACE_CLASS The class of an ICAO <AIRSPACE>. ENUMERATION   483
ICE_COVERAGE_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fraction of a <WATERBODY_SURFACE> that is covered by floating <ICE>. Zero means no floating <ICE> is present and one means the <WATERBODY_SURFACE> is completely covered. REAL PURE_NUMBER 484
ICE_COVERED An indication that a <WATERBODY_SURFACE> is covered with <ICE>. BOOLEAN   485
ICE_DRAFT_ROOT_MEAN_SQUARE The root-mean-square <<DEPTH>> of the layer of surface <ICE> within a delineated <WATERBODY_SURFACE_REGION>. REAL LENGTH 486
ICE_KEEL_DENSITY The areal density of <ICE_KEEL>s within a delineated <WATERBODY_SURFACE_REGION>. REAL AREAL_ENTITY_DENSITY 487
ICE_LAYER_THICKNESS The <<THICKNESS>> of a layer of <ICE> on a <WATERBODY_SURFACE>. REAL LENGTH 488
ICING_TYPE The type of any deposit or coating of <ICE> on an <OBJECT> caused by the impingement and freezing of liquid (usually supercooled) hydrometeors; the icing type. ENUMERATION   489
IGNITION_FLASH_INTENSITY A number between 0 and 1 inclusive representing the linearly-scaled fraction of the transient illumination intensity that is associated with an <OBJECT> and that has been induced by ignition of a combustible <MATERIAL>.
EXAMPLE     Launch of a <MUNITION>. Zero means no intensity at all and one means maximum intensity. 		REAL PURE_NUMBER 490
ILLUMINANCE The photometric equivalent of irradiance that is obtained by integrating spectral irradiance weighted by luminous efficiency over the visible spectrum; the illuminance. REAL RADIANT_ENERGY_FLUENCE 491
ILLUMINANCE_DIRECT The amount of <<ILLUMINANCE>> that is direct (rather than diffuse). REAL RADIANT_ENERGY_FLUENCE 492
ILLUMINANCE_DIRECT_FROM-
_PRINCIPAL_SOURCE 		The <<ILLUMINANCE_DIRECT>> from the principal source of illumination (for example: the <SUN> and/or an illumination flare). REAL RADIANT_ENERGY_FLUENCE 493
IMO_ADOPTED An indication that an <OBJECT> has been adopted by the IMO. BOOLEAN   494
INCIDENCE_AZIMUTH_GEODETIC The <<VECTOR_AZIMUTH_GEODETIC>> toward the source of incident light (the <DIRECTION> negative to the Poynting vector). REAL PLANE_ANGLE 495
INCIDENCE_AZIMUTH_LOCAL The <<VECTOR_AZIMUTH_LOCAL>> toward the source of incident light (the <DIRECTION> negative to the Poynting vector). REAL PLANE_ANGLE 496
INCIDENCE_AZIMUTH_MAGNETIC The <<VECTOR_AZIMUTH_MAGNETIC>> toward the source of incident light (the <DIRECTION> negative to the Poynting vector). REAL PLANE_ANGLE 497
INCIDENCE_ELEV_ANGLE-
_HORIZONTAL 		The <<VECTOR_ELEV_ANGLE_HORIZONTAL>> toward the source of incident light (the <DIRECTION> negative to the Poynting vector). REAL PLANE_ANGLE 498
INCIDENCE_ELEV_ANGLE_LOCAL The <<VECTOR_ELEV_ANGLE_LOCAL>> toward the source of incident light (the <DIRECTION> negative to the Poynting vector). REAL PLANE_ANGLE 499
INCIDENCE_ZENITH_ANGLE_LOCAL The angle at a <LOCATION> on a <SURFACE> between the vectors A and B, where A is the surface normal vector and B is the <DIRECTION> from which the source light is incident on that point (the negative of the Poynting vector). The positive sense is clockwise when looking in the <DIRECTION> of the cross product AxB. REAL PLANE_ANGLE 500
INFRARED_HEAT_FLUX The rate of flow (flux) of heat to a <SYSTEM> due to infrared radiation. REAL IRRADIANCE 501
INLAND_HYDROGRAPHIC_PERMANENCE The permanence of an inland hydrographic <OBJECT>. ENUMERATION   502
INLAND_WATER_OBSTRUCTION An indication that an <OBJECT> in <INLAND_WATER> is an obstruction to the movement of <VESSEL>s. BOOLEAN   503
INSIDE_DIAMETER The diameter of a cylindrical or spherical <OBJECT> measured using the inside <SURFACE>s. REAL LENGTH 504
INSTALLATION_BUOY_TYPE The type of an installation <BUOY>. ENUMERATION   505
INTEG_BIDIRECTIONAL-
_REFLECTANCE_DISTRIBUTION-
_FUNCTION 		The ratio, for a particular material <SURFACE>, of the differential reflected <<RADIANCE>> into a unit solid angle about a particular (reflected) <DIRECTION> to the differential incident flux per unit surface <<AREA>> (irradiance) from a particular (incident) <DIRECTION>; bi-directional reflectance distribution function or directional-directional reflectance. This quantity is a function of the incident and reflected zenith and azimuth angles. This quantity is wavelength-band integrated, the units are inverse solid angle, and the particular band is specified separately. REAL RECIPROCAL_SOLID_ANGLE 506
INTEG_DIRECTIONAL-
_HEMISPHERICAL_REFLECTIVITY 		The ratio, for a particular material <SURFACE> and unit solid angle about a particular incident <DIRECTION>, of the reflected <<RADIANCE>> into the hemisphere above that <SURFACE> to the incident <<RADIANCE>>. This quantity is also defined as the integral over the reflected hemisphere of the BRDF times the cosine of the angle between the surface normal and the reflection <DIRECTION> times the differential reflection solid angle. It is a function of the zenith and azimuth angles of the incident light and is wavelength-band integrated; therefore the quantity is unitless and the particular band is specified separately. REAL PURE_NUMBER 507
INTEG_HEMISPHERICAL-
_DIRECTIONAL_REFLECTIVITY 		The ratio, for a particular material <SURFACE> and unit solid angle about a particular reflection <DIRECTION>, of the reflected <<RADIANCE>> into that solid angle to the purely diffuse, total incident <<RADIANCE>> from the hemisphere above that <SURFACE>. REAL PURE_NUMBER 508
INTEG_HEMISPHERICAL-
_HEMISPHERICAL_REFLECTIVITY 		The ratio, for a particular material <SURFACE> and unit solid angle about a particular reflection <DIRECTION>, of the reflected <<RADIANCE>> into that solid angle to the purely diffuse, total incident <<RADIANCE>> from the hemisphere above that <SURFACE>. This quantity is also defined as the integral over the incident hemisphere of the BRDF times the cosine of the angle between the surface normal and the incidence <DIRECTION> times the differential incident solid angle. It is a function of the zenith and azimuth angles of the reflected light and is wavelength-band integrated; therefore the quantity is unitless and the particular band is specified separately. REAL PURE_NUMBER 509
INTERCHANGE_TRAVERSABILITY The traversability provided at a four-way <ROAD_INTERCHANGE> between the entry segments of adjacent <ROAD>s. Each entry segment necessarily connects to an opposing exiting segment (two pairs are thus formed) and optionally to either of the adjacent left or right entry segments. The first entry segment is that entering the interchange in the <DIRECTION> of the associated <BRIDGE_SPAN>; the remaining three entry segments are ordered in a counter-clockwise <DIRECTION> with the third entry serving as the exit for the first entry, and similarly the fourth for the second. Formatted in a Basic Latin string containing exactly four characters with the ith character corresponding to traversability from the ith entry (i = 1, 2, 3 and 4). Each character position in the string contains one of the characters N (no turns), R (right turn), L (left turn) or B (both right and left turn).
EXAMPLE     "NRBL" means no turns from first entry; right turn from second entry; right and left turn from third entry; and left turn from fourth entry. 		CONSTRAINED_STRING   510
INTEREST_TYPE The reason an <OBJECT> is of interest. ENUMERATION   511
INTERIOR_AIR_EXCHANGE_RATE The number of complete exchanges of the interior <AIR> in a <STRUCTURE> per unit time; the interior air exchange rate. REAL RATE 512
INTERIOR_LIGHTING_INTENSITY A number between 0 and 1 inclusive representing the linearly-scaled fractional intensity of the general internal <LIGHTING> of an <OBJECT>. Zero means unlit and one means maximum intensity. REAL PURE_NUMBER 513
INTERIOR_WALL_CONSTRUCTION-
_TYPE 		The type of <MATERIAL> and/or techniques used to construct an <INTERIOR_WALL>. ENUMERATION   514
INTERNAL_FLOW_SPEED The <<SPEED>> of any internal convective flow within an <OBJECT>. REAL SPEED 515
INTERNAL_TEMPERATURE The internal <<TEMPERATURE>> of a <MATERIAL> or <OBJECT>. REAL THERMO_TEMPERATURE 516
IONOSPHERIC_SCINT_EAST_DRIFT The <<SPEED>> of eastward drift of the electromagnetic scintillation density irregularities in an <IONOSPHERE>. REAL SPEED 517
IONOSPHERIC_SCINT_MAXIMUM_SIZE The upper limit on the size of the electromagnetic scintillation density irregularities in an <IONOSPHERE>. REAL LENGTH 518
IONOSPHERIC_SCINT_NORTH_DRIFT The <<SPEED>> of northward drift of the electromagnetic scintillation density irregularities in an <IONOSPHERE>. REAL SPEED 519
IONOSPHERIC_SCINT_PHASE-
_ALTITUDE 		The <<ALTITUDE_MSL>> of the equivalent electromagnetic scintillation phase screen in an <IONOSPHERE>. REAL LENGTH 520
IONOSPHERIC_SCINT_STRUCTURE-
_ANGLE 		The angle between the electromagnetic scintillation irregularities and <LINE>s of the local <MAGNETIC_FIELD>; the ionospheric scintillation structure angle. If zero, all ionospheric plasma density irregularities are aligned along the local <MAGNETIC_FIELD>. REAL PLANE_ANGLE 521
IONOSPHERIC_SCINT_UP_DRIFT The <<SPEED>> of upward drift of the electromagnetic scintillation density irregularities in an <IONOSPHERE>. REAL SPEED 522
IRRIGATION_METHOD The method used to supply crops with <WATER>; the irrigation method. ENUMERATION   523
ISLAMIC_DENOMINATIONAL_FAMILY The designation of a <NON_EMPTY_SET> of closely related Islamic religious denominations, often ones which were at one time part of a single movement but are now separate religious denominations; the Islamic denominational family. ENUMERATION   524
ISOBARIC_SURFACE_LEVEL The <<ALTITUDE_MSL>> of a standard isobaric <SURFACE> in units proportional to the potential energy of unit <<MASS>> (geopotential) at that <SURFACE>. REAL GEOPOTENTIAL_ENERGY_LENGTH 525
ISOLATED An indication that a <FACILITY> is isolated. BOOLEAN   526
ISOLATED_COMMUNICATION_LINE An indication that a communication line is in the open (isolated), as opposed to being in the midst of other <OBJECT>s (not isolated). BOOLEAN   527

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