Table 6.23 -- EDCS Attributes whose label begins with T
| Label | Definition | Attribute value type | EQ label | Related concepts | Code |
| TAKEOFF_DISTANCE_AVAILABLE | The length of the takeoff distance available plus the length of the overrun if available for an aircraft to take off, on a runway. | REAL | LENGTH | 1151 | |
| TANKER_COUNT | The number of tankers (gross weight > 907 184,7 kilograms (1 000 tons); dead weight <= 158 757,3 kilograms (approximately 175 000 tons); length = 18 to 300 metres) in a nominal 111,120 kilometres (60 nautical miles) square cell of ocean. | COUNT | 1152 | ||
| TAXIWAY_LIGHTING_INTENSITY | The fraction of maximum intensity of airport taxiway lighting. | REAL | PURE_NUMBER | 1153 | |
| TELESCOPE_TYPE | The type of a telescope. | ENUMERATION | 1154 | ||
| TEMP_INVLYR_BOT_ALTITUDE | The altitude above ground level of the bottom of a temperature inversion layer. | REAL | LENGTH | 1155 | |
| TEMP_INVLYR_LAPSE_RATE | The rate of change of temperature with increasing altitude in a temperature inversion layer. | REAL | LINEIC_THERMO_TEMP_GRADIENT | 1156 | |
| TEMP_INVLYR_TOP_ALTITUDE | The altitude above ground level of the top of a temperature inversion layer. | REAL | LENGTH | 1157 | |
| TEMPERATURE_CONTRAST | The contrast of an object expressed as the difference between the temperature of the object and the temperature of the apparent background. | REAL | THERMO_TEMPERATURE | 1158 | |
| TEMPERATURE_EXTREME_TYPE | The extreme temperature as a minimum or maximum. | ENUMERATION | 1159 | ||
| TEMPERATURE_QUALITY | The quality of an air temperature observation. | ENUMERATION | EA AIR_TEMPERATURE, EA SURFACE_AIR_TEMPERATURE | 1160 | |
| TEMPORAL_AXIS_DIMENSION | The dimension along a temporal axis, e.g., as used in a multi-dimensional data structure describing a sequence of measurements over time. | REAL | TIME | 1161 | |
| TENT_DEPLOYMENT | The position of the deployable or extension tent in terms of fractional deployment from a fully stowed/retracted/closed state. | REAL | PURE_NUMBER | 1162 | |
| TERMINAL_LIGHT_SECTOR_ANGLE | Terminal horizontal angular limit of light visibility. Limits of sectors and arcs of visibility are arranged clockwise and are given from seaward toward the light. | REAL | PLANE_ANGLE | EA INITIAL_LIGHT_SECTOR_ANGLE | 1163 |
| TERRAIN_CHANNEL_WIDTH | The predominant distance across the bottom (e.g., base or channel) of a localized terrain depression (e.g., ditch, gully, arroyo, or riverbed), as measured perpendicular to the centerline of its length along the depression. | REAL | LENGTH | EA TERRAIN_CREST_WIDTH, EA TERRAIN_GAP_WIDTH | 1164 |
| TERRAIN_CREST_WIDTH | The predominant distance across the crest of a localized terrain ridge (e.g., dam or berm), as measured perpendicular to the centerline of its length along the crest. | REAL | LENGTH | EA TERRAIN_CHANNEL_WIDTH, EA TERRAIN_GAP_WIDTH | 1165 |
| TERRAIN_FACET_SHAPE | The shape of the terrain polygon associated with a terrain facet model or basis set. | ENUMERATION | 1166 | ||
| TERRAIN_GAP_WIDTH | The minimum horizontal bridging distance between the banks of a localized terrain depression or channel (e.g., a ditch, ravine, or stream), as measured perpendicular to the centerline of its length along the depression or channel. | REAL | LENGTH | EA TERRAIN_CHANNEL_WIDTH, EA TERRAIN_CREST_WIDTH | 1167 |
| TERRAIN_SRF_AIR_PRESSURE | The atmospheric pressure at ground surface level. | REAL | PRESSURE | 1168 | |
| TERRAIN_SRF_ROUGHNESS_DESC | The description of the terrain surface geomorphology. | STRING | EA TERRAIN_SRF_ROUGHNESS_TYPE | 1169 | |
| TERRAIN_SRF_ROUGHNESS_TYPE | The type of terrain surface geomorphology. | ENUMERATION | EA TERRAIN_SRF_ROUGHNESS_DESC | 1170 | |
| TERRAIN_SURFACE_MARKS | The type of markings present, indicating disturbance to the naturally occurring terrain surface (e.g., configuration or cover) such as ruts, charring by fire, or ploughing. | ENUMERATION | 1171 | ||
| TERTIARY_TRAFFIC_DIRECTION | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the direction of traffic, third occurrence. | REAL | PLANE_ANGLE | 1172 | |
| TEXTUAL_OBJECT_IDENTIFIER | The textual identifier (often termed a "number") of an object; used for linking to an external database or reference. | KEY | 1173 | ||
| THERMAL_CONDUCTIVITY | The ratio of thermal flux density through a surface, within the material or object, to the temperature gradient across that surface. | REAL | THERMAL_CONDUCTIVITY | 1174 | |
| THERMAL_THICKNESS | The thermal thickness (e.g., effective depth) of temperature variation within an object over the diurnal cycle; diurnal thermal fluctuations cease around three to five diurnal depths. | REAL | LENGTH | 1175 | |
| THERMOCLINE_TEMP_GRAD | The temperature gradient within the thermocline. The thermocline is that region in a thermally stratified body of water in which the temperature decrease with depth is greater than that of the water above and below it. | REAL | LINEIC_THERMO_TEMP_GRADIENT | 1176 | |
| THERMOCLINE_TEMP_GRAD_STDV | The standard deviation of the thermocline gradient within a set. | REAL | LINEIC_THERMO_TEMP_GRADIENT | 1177 | |
| THICKNESS | The distance between two of an object's opposite surfaces; usually the dimension of smallest measure. | REAL | LENGTH | 1178 | |
| THIN_LAYER_SEDIMENT_DENSITY | The ratio of the mass of a sample taken of the surficial sediment layer at the bottom of the ocean to the volume occupied by the sample. | REAL | VOLUMIC_MASS | 1179 | |
| THUNDERSTORM_INTENSITY | The intensity of a thunderstorm as determined from its precipitation rate. | ENUMERATION | 1180 | ||
| THUNDERSTORM_MAXIMUM_WIND | The maximum winds measured within a thunderstorm. | ENUMERATION | 1181 | ||
| THUNDERSTORM_PROBABILITY | The probability of the occurrence of a thunderstorm. | REAL | PURE_NUMBER | 1182 | |
| THUNDERSTORM_TOP_ALTITUDE | The altitude, from MSL, to the top of a thunderstorm. | REAL | LENGTH | 1183 | |
| TIDE_INFLUENCED | Indicates that the object is affected by the tides. | LOGICAL | 1184 | ||
| TIDE_LEVEL | The periodic component of varying ocean surface height, with respect to MSL, due to the gravitational attraction of the moon and sun. | REAL | LENGTH | 1185 | |
| TIDE_REFLVL_CURRENT_DIR | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the direction of water flow (current) at tide reference level. | REAL | PLANE_ANGLE | 1186 | |
| TIDE_REFLVL_CURRENT_RATE | The rate of water flow (current) at tide reference level. | REAL | VELOCITY | 1187 | |
| TIME_DIVISION_WITHIN_DAY | The division of the day (one of several), marked by the passage of the sun through its diurnal cycle. | ENUMERATION | 1188 | ||
| TONNAGE | The tonnage of a sunken or stranded wreck, a hulk, or other vessel. | REAL | MASS | 1189 | |
| TOP_MARK_SHAPE | The type of shape of a top mark. | ENUMERATION | 1190 | ||
| TOP_MARK_TYPE | The type of characteristic shape secured at the top of a buoy or beacon to aid identification. | ENUMERATION | 1191 | ||
| TOP_WIDTH | The width at the top of an object. | REAL | LENGTH | 1192 | |
| TOTAL_CLOUD_COVER_CODED | The portion of the total celestial dome covered by clouds or other obscuring phenomena. | ENUMERATION | 1193 | ||
| TOTAL_CLOUD_COVERAGE | The fraction of the celestial dome that is covered by clouds, as observed by a ground observer. | REAL | PURE_NUMBER | 1194 | |
| TOTAL_CLOUD_COVERAGE_CLIM | The quantity of historical occurrences of all cloud coverages, as observed by a ground observer. | INTEGER | PURE_NUMBER | 1195 | |
| TOTAL_ELECTRON_CONTENT | The maximum equivalent quantity of free electrons vertically above the location making the assessment during the period of the assessment. | REAL | AREAL_ENTITY_DENSITY | 1196 | |
| TOTAL_LENGTH | The total length of the travelled way between two locations. | REAL | LENGTH | 1197 | |
| TOTAL_MAGNETIC_FIELD | The strength of the planetary magnetic field as measured in orbit, i.e., the magnitude of the total magnetic field vector. | REAL | MAGNETIC_FLUX_DENSITY | 1198 | |
| TOTAL_PLATOON_CAPACITY | The number of platoons, with associated equipment, which an object can accommodate. | REAL | PURE_NUMBER | 1199 | |
| TOTAL_PRECIPITATION | The total precipitation (water equivalent) that accumulated during a measurement time interval. | REAL | SURFACE_DENSITY | 1200 | |
| TOTAL_USABLE_WIDTH | The total usable width including pavements and hard shoulders. | REAL | LENGTH | 1201 | |
| TOWER_TYPE | The type of tower. | ENUMERATION | 1202 | ||
| TRAFFIC_FLOW | The type of flow-pattern of traffic. | ENUMERATION | 1203 | ||
| TRAFFIC_SCHEME_COMPONENT | The type of component of a traffic routing system. | ENUMERATION | 1204 | ||
| TRAFFIC_SIGNAL_STATION_TYPE | The type of a traffic signal station. | ENUMERATION | 1205 | ||
| TRANSMISSION_LOSS | The ratio of energy density (e.g., watts per square metre or pascal), at the end point to that at the starting point generally expressed in decibels (negative sign assumed). For acoustic transmission loss, the starting point is one metre from the source. Transmission loss takes into account loss from absorption, scattering, boundary interactions, and any other phenomena within the complex environment. Transmission loss may be qualified by other attributes, e.g., the electromagnetic band for which the value applies. | REAL | FIELD_OR_POWER_LEVEL | EA EM_BAND | 1206 |
| TRANSMISSIVITY | The ratio of transmitted to incident flux, from one traversal through the homogeneous material or object, generally expressed as a dimensionless number or in decibels (negative sign assumed). Transmissivity is also related to transmission attenuation and extinction coefficient. Transmissivity, in decibels, divided by the propagation distance or material thickness equates to transmission attenuation. The natural logarithm of transmissivity divided by the propagation distance or material thickness equates to extinction coefficient. Transmissivity may be qualified by other attributes, e.g., the electromagnetic band for which the value applies. | REAL | FIELD_OR_POWER_LEVEL | EA EM_BAND | 1207 |
| TRANSPORTATION_USE | The type of primary user, function, or authority of a transportation system. | ENUMERATION | 1208 | ||
| TRAVERSABILITY | The type of traversability of an object, on foot. | ENUMERATION | 1209 | ||
| TREE_CANOPY_LEVEL_COUNT | The number of canopies (vegetation levels) in a woodland. | COUNT | 1210 | ||
| TREE_SPACING | The average distance between adjacent tree centrelines within the delineated object's extent. | REAL | LENGTH | 1211 | |
| TREE_SPACING_RANGE | Estimated range of the average distance between trees in a stand, from centre to centre of adjacent trees. | ENUMERATION | 1212 | ||
| TREE_TYPE | The type of a tree. | ENUMERATION | 1213 | ||
| TRNS_ATTENUATION_GRADIENT | The propagation range gradient of the ratio of transmitted to incident flux, generally expressed as a power ratio per length of range (negative sign assumed). Transmission attenuation gradient is also directly related to extinction coefficient and transmissivity. Transmissivity, in decibels (negative sign assumed), divided by the propagation distance or material thickness equates to transmission attenuation. The natural logarithm of transmissivity divided by the propagation distance or material thickness equates to extinction coefficient. Transmission attenuation gradient may be qualified by other attributes, e.g., the electromagnetic or acoustic band for which the value applies. | REAL | POWER_LEVEL_LENGTH_GRADIENT | EA EM_BAND | 1214 |
| TRNSMT_AZANG_GEODETIC | The angle in the horizontal plane, measured in a clockwise direction from above, from planetary geodetic north to the projection of the transmitted vector in the horizontal plane. | REAL | PLANE_ANGLE | 1215 | |
| TRNSMT_AZANG_LOCAL_NORMAL | The angle in the plane perpendicular to the local normal, generally the local x-y plane that is perpendicular to the local z-axis, measured counter-clockwise from the azimuth reference vector, normally the local x-axis, to the projection of the transmitted vector onto that plane. This attribute is generally used as a qualifier for other attributes, e.g., transmissivity as a function of transmitted angle. | REAL | PLANE_ANGLE | 1216 | |
| TRNSMT_ELANG_HORIZONTAL | The angle in the vertical plane, measured from the horizontal plane, to the transmitted vector. | REAL | PLANE_ANGLE | 1217 | |
| TRNSMT_ELANG_LOCAL_NORMAL | The angle measured from the plane perpendicular to the normal vector to the transmitted vector and defined positive if the transmitted vector is in the same hemisphere as the normal vector and negative otherwise. This attribute is generally used as a qualifier for other attributes, e.g., transmissivity as a function of angle. | REAL | PLANE_ANGLE | 1218 | |
| TROPOPAUSE_ALTITUDE | The altitude, relative to MSL, of the tropopause, the boundary between the upper troposphere and the lower stratosphere. | REAL | LENGTH | 1219 | |
| TROPOPAUSE_PRESENT | Indicates the existence of a tropopause. | LOGICAL | 1220 | ||
| TROPOPAUSE_PRESSURE | The atmospheric pressure at the lowest tropopause. | REAL | PRESSURE | 1221 | |
| TROPOPAUSE_TEMPERATURE | The air temperature at the tropopause. | REAL | THERMO_TEMPERATURE | 1222 | |
| TSS_IMO_ADOPTED | Indicates that a TSS has been adopted by the IMO. | LOGICAL | 1223 | ||
| TURBULENCE_BASE_ALTITUDE | The altitude, relative to MSL, of the lower surface of the aircraft turbulence layer. | REAL | LENGTH | 1224 | |
| TURBULENCE_FREQUENCY | The rate of occurrence of turbulence to aircraft. | ENUMERATION | 1225 | ||
| TURBULENCE_INTENSITY | The intensity of turbulence to aircraft. | ENUMERATION | 1226 | ||
| TURBULENCE_TOP_ALTITUDE | The altitude, relative to MSL, of the upper surface of the aircraft turbulence layer. | REAL | LENGTH | 1227 | |
| TURBULENCE_TYPE | The type of aircraft turbulence. | ENUMERATION | 1228 |