Table 6.15 -- EDCS Attributes whose label begins with L
| Label | Definition | Attribute value type | EQ label | Related concepts | Code |
| LAMBERT_LAW_CONSTANT | The parameter used in the Lambert Law equation for calculating bottom scattering. | REAL | PURE_NUMBER | 439 | |
| LANDING_DISTANCE_AVAILABLE | The length of a runway that is declared available and suitable for the ground run of an aircraft landing. | REAL | LENGTH | 440 | |
| LANDING_LIGHT_INTENSITY | The fraction of maximum intensity of external aircraft lighting used to illuminate the ground during landing procedures. | REAL | PURE_NUMBER | 441 | |
| LANE_MARKING_TYPE | Type of lane marking on a road or runway. | ENUMERATION | 442 | ||
| LARGE_SCALE_CORRELATION_LEN | The correlation length of the large-scale surface roughness. | REAL | LENGTH | EA LARGE_SCALE_ROUGHNESS | 443 |
| LARGE_SCALE_ROUGHNESS | The large-scale (i.e., orders of magnitude larger than the wavelength of the electromagnetic radiation of concern) roughness expressed as the standard deviation of the surface variations. | REAL | LENGTH | 444 | |
| LARGE_TANKER_COUNT | The number of large tankers (dead weight > 158 757,3 kilograms (approximately 175 000 tons) and <= 317 514,6 kilograms (approximately 350 000 tons); length = 300 to 325 metres) in a nominal 111,120 kilometres (60 nautical miles) square cell of ocean. | COUNT | 445 | ||
| LATENT_HEAT_FLUX | The rate of heat flow per unit mass for a system in a reversible, isobaric-isothermic change of phase. | REAL | IRRADIANCE | 446 | |
| LATENT_HEAT_FUSION | The amount of energy per unit mass of an object that must be transferred to change its state from solid to liquid. | REAL | SPECIFIC_ENERGY | 447 | |
| LATENT_HEAT_SUBLIMATION | The amount of energy per unit mass of an object that must be transferred to change its state from solid to gas. | REAL | SPECIFIC_ENERGY | 448 | |
| LATENT_HEAT_VAPORIZATION | The amount of energy per unit mass of an object that must be transferred to change its state from liquid to gas. | REAL | SPECIFIC_ENERGY | 449 | |
| LEFT_ABOVE_BANK_SLOPE | The slope of the left bank (facing downstream) above water level. | REAL | PURE_NUMBER | EA LEFT_BELOW_BANK_SLOPE | 450 |
| LEFT_BANK_HEIGHT | The height of the left bank (facing downstream) above the water level to the average water level. | REAL | LENGTH | 451 | |
| LEFT_BANK_HEIGHT_RANGE | Predominant height range of the left bank (facing downstream), measured from mean water level to the first break in slope above the mean water level. | ENUMERATION | 452 | ||
| LEFT_BANK_SLOPE_RANGE | Predominant slope range of the left bank (facing downstream) measured from mean water level to the first accessible break in slope above the mean water level. | ENUMERATION | 453 | ||
| LEFT_BANK_VEGETATION | A range indicating the density of vegetation found on the left bank. | ENUMERATION | EA RIGHT_BANK_VEGETATION | 454 | |
| LEFT_BELOW_BANK_SLOPE | The slope of the left bank (facing downstream) below water level. | REAL | PURE_NUMBER | EA LEFT_ABOVE_BANK_SLOPE | 455 |
| LENGTH | The length of the longer of two linear axes. For a square object, measure either axis. For a round object, measure the diameter. For a bridge, the length is the distance between the bridge abutments. | REAL | LENGTH | 456 | |
| LF_ACOUSTIC_SCATLYR_BOT_DEP | The depth, measured from the sea surface, of the lower boundary of the low frequency scattering layer. | REAL | LENGTH | 457 | |
| LF_ACOUSTIC_SCATLYR_TOP_DEP | The depth, measured from the sea surface, of the upper boundary of the low frequency scattering layer. | REAL | LENGTH | 458 | |
| LF_BOT_LOSS_PROV_IDENTIFIER | The numeric identifier of a low frequency bottom loss province; used for linking to an external database or reference. | INDEX | 459 | ||
| LIFE_FORM_POSTURE | The posture of a life form. | ENUMERATION | 460 | ||
| LIFTED_ATM_STABILITY_NDX | The quantity of the value that indicates the degree of stability of the layer of the atmosphere extending from a level near the surface of the Earth to the 500 kilopascal (500 millibar) surface. | REAL | PURE_NUMBER | 461 | |
| LIGHT_CHARACTER | The signal light identifier, which is composed of the class, number and colours of flashes or occultations, of a light or lights at one geographic position; e.g., "Q(6)+L F1", "VQ G", and "L F1 (3+2)WR". | STRING | 462 | ||
| LIGHT_ELEVATION | The elevation of a light with respect to a specified vertical datum. | REAL | LENGTH | 463 | |
| LIGHT_FUNCTION | The various functions of a light. | ENUMERATION | 464 | ||
| LIGHT_ICING_POTENTIAL | The frequency of occurrence of light icing potential on superstructures. Light icing on superstructures does not occur unless the air temperature is less than or equal to -2 degrees Celsius, and the wind speed is greater than or equal to 6,69 metres per second (13 knots). | REAL | PURE_NUMBER | 465 | |
| LIGHT_MULTIPLICITY | The number of lights of identical character that exist as a co-located group. | INTEGER | PURE_NUMBER | 466 | |
| LIGHT_PATTERN | The type of sequence, grouping, and/or distinctive character of a light. | ENUMERATION | 467 | ||
| LIGHT_PERIOD | The time occupied by an entire cycle of intervals of light and dark. | REAL | TIME | 468 | |
| LIGHT_RELATIVE_POSITION | The relative horizontal location of a beacon or light in a range of two or three lights. | ENUMERATION | 469 | ||
| LIGHT_SECTOR_ANGLE | The horizontal angular limits of light visibility. Limits of sectors and arcs of visibility are arranged clockwise and are given from seaward toward the light. | REAL | PLANE_ANGLE | 470 | |
| LIGHT_SUPERVISED | Indicates that the light is supervised. | LOGICAL | 471 | ||
| LIGHT_VISIBILITY | The type of specific visibility of light. | ENUMERATION | 472 | ||
| LIGHT_VISIBILITY_RANGES | A set of two numbers for light ranges of visibility (at a light) expressed in nautical miles; the numbers are separated by a slash (/) if only two visibilities exist, or by a dash (-) separating the greatest and least visibilities if three or more exist. | STRING | 473 | ||
| LIGHTNING_CURRENT_STRENGTH | The current strength of the first stroke of the lightning discharge. | REAL | ELECTRIC_CURRENT | 474 | |
| LIGHTNING_DATA_CONSISTENCY | The quantity of the chi-square statistical agreement between cloud-to-ground lightning detection measurements. | REAL | PURE_NUMBER | 475 | |
| LIGHTNING_DETECTOR_COUNT | The quantity of detectors reporting the lightning discharge. | COUNT | 476 | ||
| LIGHTNING_LOCERREL_ANGLE | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the semi-major axis of the error ellipse for a lightening stroke. | REAL | PLANE_ANGLE | 477 | |
| LIGHTNING_LOCERREL_MJR_AXIS | The dimension of the semi-major axis of the location error ellipse for a lightning stroke. | REAL | LENGTH | 478 | |
| LIGHTNING_LOCERREL_MNR_AXIS | The dimension of the semi-minor axis of the location error ellipse for a lightning stroke. | REAL | LENGTH | 479 | |
| LIGHTNING_POLARITY | The polarity of a lightning strike. | ENUMERATION | 480 | ||
| LIGHTNING_PROBABILITY | The probability that lightning will occur. | REAL | PURE_NUMBER | 481 | |
| LIGHTNING_STROKE_COUNT | The number of lightning strokes that constitute a single lightning flash. | COUNT | 482 | ||
| LIGHTNING_TIME_ADJUSTMENT | The quantity of time added to the observation time of a lightning stroke to account for increased accuracy. | REAL | TIME | 483 | |
| LINE_ASSOCIATED_NAVAIDS | The type and/or number of NAVAIDs associated with a leading or clearing line. | ENUMERATION | 484 | ||
| LINE_TYPE | The characteristics of a line used during interpolation between two points. | ENUMERATION | 485 | ||
| LITTORAL_CURRENT_U | The speed of surf zone (breaking wave) ocean current in the west-east direction where east is positive. | REAL | VELOCITY | 486 | |
| LITTORAL_CURRENT_V | The speed of surf zone (breaking wave) ocean current in the south-north direction where north is positive. | REAL | VELOCITY | 487 | |
| LOAD_CLASS_1_WAY_TRACKED | The weight bearing capacity of a bridge or bridge span for one way tracked traffic; also known as the military load classification, type 3. | REAL | MASS | 488 | |
| LOAD_CLASS_1_WAY_WHEELED | The weight bearing capacity of a bridge or bridge span for one way wheeled traffic; also known as the military load classification, type 1. | REAL | MASS | 489 | |
| LOAD_CLASS_2_WAY_TRACKED | The weight bearing capacity of a bridge or bridge span for two way tracked traffic; also known as the military load classification, type 4. | REAL | MASS | 490 | |
| LOAD_CLASS_2_WAY_WHEELED | The weight bearing capacity of a bridge or bridge span for two way wheeled traffic; also known as the military load classification, type 2. | REAL | MASS | 491 | |
| LONGEST_SPAN_LENGTH | The length of the longest span of a bridge. | REAL | LENGTH | 492 | |
| LOW_CLOUD_BASE_ALTITUDE | The altitude of the base of a low-level cloud layer, relative to a vertical reference datum. Low-level clouds are composed of water and are of the stratus, stratocumulus, and fair weather cumulus types. The altitude of the bases of these clouds range from near surface to about 1 980 metres (6 500) feet in the mid-latitudes. | REAL | LENGTH | 493 | |
| LOW_CLOUD_COVERAGE | The fraction of the sky dome that is covered by all low level clouds, as observed from the ground. | REAL | PURE_NUMBER | 494 | |
| LOW_CLOUD_COVERAGE_CLIM | The quantity of historical occurrences of low cloud coverage, as observed by a ground observer. | INTEGER | PURE_NUMBER | 495 | |
| LOW_CLOUD_TOP_ALTITUDE | The altitude of the top of a low-level cloud layer, relative to a vertical reference datum. Low-level clouds are composed of water and are of the stratus, stratocumulus, and fair weather cumulus types. The altitude of the bases of these clouds range from near surface to about 1 980 metres (6 500) feet in the mid-latitudes. | REAL | LENGTH | 496 | |
| LOW_CLOUD_TYPE | The type of low cloud. | ENUMERATION | 497 | ||
| LOWEST_AIRSPACE_ALT | The altitude AGL to the lowest portion of the airspace. | REAL | LENGTH | 498 | |
| LOWEST_AIRSPACE_ALT_LIMIT | The lowest airspace altitude limit. | REAL | LENGTH | 499 | |
| LOWEST_CLOUD_BASE_ALT | The altitude above ground level of the base of the lowest cloud. | REAL | LENGTH | 500 | |
| LOWEST_CLOUD_COVERAGE | The fraction of the celestial dome covered by low clouds. | ENUMERATION | 501 | ||
| LOWEST_ELEVATION | The elevation above a specified vertical datum to the lowest portion of an object. | REAL | LENGTH | 502 | |
| LOWEST_GROUND_WATER_LEVEL | The lowest annual average level of ground water. | REAL | LENGTH | 503 | |
| LUMINOUS_LIGHT_RANGE | The maximum distance at which a light can be seen by the intensity of the light and meteorological visibility. | REAL | LENGTH | 504 | |
| LUNAR_DIFFUSED_RADIATION | Diffused lunar incident flux (or irradiance) per unit of an object's surface area. | REAL | IRRADIANCE | 505 | |
| LUNAR_DIRECT_RADIATION | The direct lunar incident flux (or irradiance) per unit of an object's surface area. | REAL | IRRADIANCE | 506 |