EDCS Attribute Symbolic Constant: EAC_LAMBERT_LAW_CONSTANT

EDCS Attribute Code: 453

Definition:
The parameter used in the Lambert Law equation for calculating <WATER_BODY_FLOOR> acoustic scattering; the Lambert Law constant.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: ALGORITHM_RELATED, WATER_BODY_FLOOR

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LANDING_CRAFT_TYPE

EDCS Attribute Code: 454

Definition:
The type of a <LANDING_CRAFT>.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	ASSAULT_CARGO	EEC_LNDGCRFTTY_ASSAULT_CARGO	Designed for carrying <CARGO> in support assault landing operations.	NR
2	ASSAULT	EEC_LNDGCRFTTY_ASSAULT	Designed for assault landing operations.	NR
3	DOCK_LANDING	EEC_LNDGCRFTTY_DOCK_LANDING	Designed to convey docks, <EQUIPMENT>, and <VEHICLE>s from <SEA> to <SHORE>.	NR
4	LCAC	EEC_LNDGCRFTTY_LCAC	Designed for transporting, <SEA> to <SHORE> and across the <BEACH>, <PERSONNEL>, weapons, <EQUIPMENT>, and <CARGO> at high speed.	IR	[WNT1]
5	TANK_LANDING	EEC_LNDGCRFTTY_TANK_LANDING	Designed to transport military tank <VEHICLE>s to <SHORE>.	NR

EDCS Group Labels: VEHICLE

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LANDING_DISTANCE_AVAILABLE

EDCS Attribute Code: 455

Definition:
The length of a <RUNWAY> that is declared available and suitable for the ground run of an <AIRCRAFT> landing; the landing distance available.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: AIR_TRNSP, DIMENSION

Reference Type: IR

References: [DAFIF, Sec. 201.B.33]

EDCS Attribute Symbolic Constant: EAC_LANDING_LIGHT_INTENSITY

EDCS Attribute Code: 456

Definition:
The intensity of external <AIRCRAFT> <LIGHTING> used to illuminate the <TERRAIN> during landing procedures, expressed as fraction of maximum.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: AIR_TRNSP, LIGHTING_AND_VISIBILITY, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LANE_COUNT

EDCS Attribute Code: 457

Definition:
The number of lanes in a <ROUTE>.

EDCS Attribute Value Data Type: COUNT

EDCS Group Labels: LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LANE_MARKING_TYPE

EDCS Attribute Code: 458

Definition:
Type of lane marking on a <ROAD> or <RUNWAY>.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	CENTRE_DASH	EEC_LANEMKTY_CENTRE_DASH	Centreline consisting of a single dashed line.	NR
2	CENTRE_SOLID	EEC_LANEMKTY_CENTRE_SOLID	Centreline consisting of a single continuous line.	NR
3	SIDES_SOLID	EEC_LANEMKTY_SIDES_SOLID	Sidelines consisting of a single continuous line each.	NR
4	SIDES_SOLID_CTR_DASH	EEC_LANEMKTY_SIDES_SOLID_CTR_DASH	Sidelines consisting of a single continuous line each, plus a centreline consisting of a single dashed line.	NR
5	SIDES_SOLID_CTR_SOLID	EEC_LANEMKTY_SIDES_SOLID_CTR_SOLID	Sidelines consisting of a single continuous line each, plus a centreline consisting of a single continuous line.	NR

EDCS Group Labels: LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LARGE_SCALE_CORRELATION_LENGTH

EDCS Attribute Code: 459

Definition:
The correlation length of the large-scale (i.e., orders of magnitude larger than the wavelength of the electromagnetic radiation of concern) <SURFACE> roughness.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LARGE_SCALE_ROUGHNESS

EDCS Attribute Code: 460

Definition:
The large-scale (i.e., orders of magnitude larger than the wavelength of the electromagnetic radiation of concern) <SURFACE> roughness expressed as the standard deviation of the <SURFACE> variations.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LARGE_TANKER_COUNT

EDCS Attribute Code: 461

Definition:
The number of large tanker <VESSEL>s (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>.

EDCS Attribute Value Data Type: COUNT

EDCS Group Labels: HYDROGRAPHIC_TRNSP, VEHICLE

Reference Type: IR

References: [OAML, Historical Temporal Shipping Data Base]

EDCS Attribute Symbolic Constant: EAC_LATENT_HEAT_FLUX

EDCS Attribute Code: 462

Definition:
The rate of heat flow per unit mass for a <SYSTEM> in a reversible, isobaric-isothermic change of phase; the latent heat flux.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: IRRADIANCE

EDCS Group Labels: TEMPERATURE

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LATENT_HEAT_FUSION

EDCS Attribute Code: 463

Definition:
The amount of energy per unit mass of an <OBJECT> that must be transferred to change its state from solid to liquid; the latent heat of fusion.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: SPECIFIC_ENERGY

EDCS Group Labels: ABSTRACT_CONCEPT

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LATENT_HEAT_SUBLIMATION

EDCS Attribute Code: 464

Definition:
The amount of energy per unit mass of an <OBJECT> that must be transferred to change its state from solid to gas; the latent heat of sublimation.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: SPECIFIC_ENERGY

EDCS Group Labels: ABSTRACT_CONCEPT

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LATENT_HEAT_VAPORIZATION

EDCS Attribute Code: 465

Definition:
The amount of energy per unit mass of an <OBJECT> that must be transferred to change its state from liquid to gas; the latent heat of vaporization.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: SPECIFIC_ENERGY

EDCS Group Labels: ABSTRACT_CONCEPT

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_ABOVE_BANK_ANGLE

EDCS Attribute Code: 466

Definition:
The angle of the left bank (facing downstream) above the mean water level from the horizontal plane of a <WATERCOURSE>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PLANE_ANGLE

EDCS Group Labels: ANGULAR_MEASURE, HYDROLOGY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_ABOVE_BANK_SLOPE

EDCS Attribute Code: 467

Definition:
The slope (rise/run) of the left bank (facing downstream) of a <WATERCOURSE> above the mean water level.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: HYDROLOGY, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_BANK_HEIGHT

EDCS Attribute Code: 468

Definition:
The height of the left bank (facing downstream) of a <WATERCOURSE>, measured from mean water level to the first break in slope above the mean water level.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, HYDROLOGY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_BANK_SLOPE

EDCS Attribute Code: 469

Definition:
The slope (rise/run) of the left bank (facing downstream) of a <WATERCOURSE>, measured from mean water level to the first accessible break in slope above the mean water level.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: HYDROLOGY, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_BANK_VEGETATION_DENSITY

EDCS Attribute Code: 470

Definition:
The density of <VEGETATION> found on the left bank (facing downstream) of a <WATERCOURSE> as a fraction of bank area.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: PLANT, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_BELOW_BANK_ANGLE

EDCS Attribute Code: 471

Definition:
The angle from the horizontal plane of the left bank (facing downstream) of a <WATERCOURSE> below the mean water level.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PLANE_ANGLE

EDCS Group Labels: ANGULAR_MEASURE, HYDROLOGY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LEFT_BELOW_BANK_SLOPE

EDCS Attribute Code: 472

Definition:
The slope (rise/run) of the left bank (facing downstream) of a <WATERCOURSE> below the mean water level.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: HYDROLOGY, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LENGTH

EDCS Attribute Code: 473

Definition:
The length of the longer of two orthogonal linear axes of an <OBJECT>. 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_PIER>s.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LF_ACOUSTIC_SCTR_LAYER_BOTTOM_DEPTH

EDCS Attribute Code: 474

Definition:
The depth, measured from the <WATER_BODY_SURFACE>, of the lower boundary of the low frequency scattering layer.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ACOUSTIC_PHENOMENON, DIMENSION

Reference Type: IR

References: [OAML, Volume Scattering Strength Data Base]

EDCS Attribute Symbolic Constant: EAC_LF_ACOUSTIC_SCTR_LAYER_TOP_DEPTH

EDCS Attribute Code: 475

Definition:
The depth, measured from the <WATER_BODY_SURFACE>, of the upper boundary of the low frequency scattering layer.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ACOUSTIC_PHENOMENON, DIMENSION

Reference Type: IR

References: [OAML, Volume Scattering Strength Data Base]

EDCS Attribute Symbolic Constant: EAC_LF_BOTTOM_LOSS_REGION_IDENTIFIER

EDCS Attribute Code: 476

Definition:
The numeric identifier of a low frequency bottom loss <REGION>.

EDCS Attribute Value Data Type: INDEX

EDCS Group Labels: WATER_BODY_FLOOR

Reference Type: IR

References: [OAML, Low-Frequency Bottom-Loss Data Base]

EDCS Attribute Symbolic Constant: EAC_LIFTED_ATMOSPHERE_STABILITY_INDEX

EDCS Attribute Code: 477

Definition:
The degree of stability of the layer of the <ATMOSPHERE> extending from a level near the <PLANETARY_SURFACE> to the 500 hectopascal (500 millibar) <SURFACE>; the lifted atmosphere stability index.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: ATMOSPHERE

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_COLOUR

EDCS Attribute Code: 478

Definition:
The colour emitted from a <LIGHT>.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	AMBER	EEC_LGTCOLR_AMBER	Amber.	DR	[NSOED]
2	BLUE	EEC_LGTCOLR_BLUE	Blue.	DR	[NSOED]
3	GREEN	EEC_LGTCOLR_GREEN	Green.	DR	[NSOED]
4	MAGENTA	EEC_LGTCOLR_MAGENTA	Magenta.	DR	[NSOED]
5	ORANGE	EEC_LGTCOLR_ORANGE	Orange.	DR	[NSOED]
6	RED	EEC_LGTCOLR_RED	Red.	DR	[NSOED]
7	WHITE	EEC_LGTCOLR_WHITE	White.	DR	[NSOED]
8	YELLOW	EEC_LGTCOLR_YELLOW	Yellow.	DR	[NSOED]

EDCS Group Labels: LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_ELEVATION

EDCS Attribute Code: 479

Definition:
The elevation of a <LIGHT> with respect to a specified <SURFACE_DATUM>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, LIGHTING_AND_VISIBILITY, POSITION

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_EXHIBITION_CONDITION

EDCS Attribute Code: 480

Definition:
The exhibition condition of a <LIGHT>.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	CONSTANT	EEC_LGTEXHIBCND_CONSTANT	A light shown throughout the 24 hours without change of character.	PR	[S57A, Attribute, EXCLIT:1]
2	DAYTIME	EEC_LGTEXHIBCND_DAYTIME	A light, which is only exhibited by day.	PR	[S57A, Attribute, EXCLIT:2]
3	NIGHT_TIME	EEC_LGTEXHIBCND_NIGHT_TIME	A light, which is only exhibited at night.	PR	[S57A, Attribute, EXCLIT:4]
4	REDUCED_VISIBILITY	EEC_LGTEXHIBCND_REDUCED_VISIBILITY	A light, which is exhibited in fog or conditions of, reduced visibility.	PR	[S57A, Attribute, EXCLIT:3]

EDCS Group Labels: LIGHTING_AND_VISIBILITY

Reference Type: PR

References: [S57A, Attribute: EXCLIT]

EDCS Attribute Symbolic Constant: EAC_LIGHT_FUNCTION

EDCS Attribute Code: 481

Definition:
The function of a <LIGHT>.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	AEROLIGHT	EEC_LGTFNTY_AEROLIGHT	An aero light is established for aeronautical navigation and may be of higher power than marine lights and visible from well offshore.	PR	[S57A, Attribute, CATLIT:5]
2	AIR_OBSTRUCTION	EEC_LGTFNTY_AIR_OBSTRUCTION	A light marking an obstacle which constitutes a danger to air navigation.	PR	[S57A, Attribute, CATLIT:6]
3	BEARING	EEC_LGTFNTY_BEARING	A light, which enables its approximate bearing to be obtained without the use of a compass.	PR	[S57A, Attribute, CATLIT:18]
4	DIRECTIONAL	EEC_LGTFNTY_DIRECTIONAL	A light illuminating a sector of very narrow angle and intended to mark a direction to follow.	PR	[S57A, Attribute, CATLIT:1]
5	EMERGENCY	EEC_LGTFNTY_EMERGENCY	A light available as a backup to a main light, which will be illuminated, should the main light fail.	PR	[S57A, Attribute, CATLIT:17]
6	FLOOD	EEC_LGTFNTY_FLOOD	A broad beam light used to illuminate a <STRUCTURE> or grounds.	IR	[S57A, Attribute, CATLIT:8]
7	FOG_DETECTOR	EEC_LGTFNTY_FOG_DETECTOR	A light used to automatically determine conditions of visibility, which warrant the turning on or off a sound signal.	PR	[S57A, Attribute, CATLIT:7]
8	FRONT	EEC_LGTFNTY_FRONT	A term used with leading lights to describe the position of the light on the lead as viewed from seaward.	PR	[S57A, Attribute, CATLIT:12]
9	FRONT_OR_LOWER	EEC_LGTFNTY_FRONT_OR_LOWER	May be further delineated specifically as EE FRONT and EE LOWER.	NR
10	LEADING	EEC_LGTFNTY_LEADING	A light associated with other lights to form a leading line to be followed.	IR	[S57A, Attribute, CATLIT:4]
11	LOWER	EEC_LGTFNTY_LOWER	A term used with leading lights to describe the position of the light on the lead as viewed from seaward.	PR	[S57A, Attribute, CATLIT:15]
12	MIDDLE	EEC_LGTFNTY_MIDDLE	Middle.	NR
13	REAR	EEC_LGTFNTY_REAR	A term used with leading lights to describe the position of the light on the lead as viewed from seaward.	PR	[S57A, Attribute, CATLIT:13]
14	REAR_OR_UPPER	EEC_LGTFNTY_REAR_OR_UPPER	May be further delineated specifically as EE REAR and EE UPPER.	NR
15	SPOTLIGHT	EEC_LGTFNTY_SPOTLIGHT	A powerful light focused so as to illuminate a small region.	IR	[S57A, Attribute, CATLIT:11]
16	STRIP	EEC_LGTFNTY_STRIP	A light whose source has a linear form generally horizontal, which can reach a length of several metres.	PR	[S57A, Attribute, CATLIT:9]
17	SUBSIDIARY	EEC_LGTFNTY_SUBSIDIARY	A light placed on or near the support of a main light and having a special use in navigation.	PR	[S57A, Attribute, CATLIT:10]
18	UPPER	EEC_LGTFNTY_UPPER	A term used with leading lights to describe the position of the light on the lead as viewed from seaward.	PR	[S57A, Attribute, CATLIT:14]

EDCS Group Labels: ANCILLARY_ARTEFACT, LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_ICE_ACCRETION_PROBABILITY

EDCS Attribute Code: 482

Definition:
The probability of light ice accretion on marine <OBJECT> surfaces; such accretion can occur on surfaces on top of, over, or near the surface of a <WATER_BODY> when the ambient <<AIR_TEMPERATURE>> is equal to or below -2 degrees Celsius and the <WIND> speed is greater than or equal to 11,32 metres per second (22 knots).

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: HYDROGRAPHIC_TRNSP, ICE, RATE_OR_RATIO

Reference Type: IR

References: [NAM1]

EDCS Attribute Symbolic Constant: EAC_LIGHT_MULTIPLICITY

EDCS Attribute Code: 483

Definition:
The number of <LIGHT>s of identical character that exist as a co-located group.

EDCS Attribute Value Data Type: COUNT

EDCS Group Labels: LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_PATTERN

EDCS Attribute Code: 484

Definition:
The type of sequence, grouping, and/or distinctive character of a <LIGHT>; the light pattern.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	ALTERNATING	EEC_LGTPAT_ALTERNATING	A rhythmic light that shows, in any given direction, two or more colours in a regularly repeated sequence with a regular periodicity, often alternating.	IR	[S57A, Attribute, LITCHR:28]
2	COMPOSITE_GROUP_FLASH	EEC_LGTPAT_COMPOSITE_GROUP_FLASH	A rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all the appearances of light are of equal duration and occur in multiple groups within a period; composite group-flashing.	NR
3	COMPOSITE_GROUP_OCCULTING	EEC_LGTPAT_COMPOSITE_GROUP_OCCULTING	A rhythmic light in which the total duration of light in a period is clearly longer than the total duration of darkness, and the long duration light periods are separated by multiple short duration light periods; composite group-occulting.	NR
4	DIRECTIONAL	EEC_LGTPAT_DIRECTIONAL	A signal light having a very narrow sector designed to mark a direction to be followed.	NR
5	DIRECTIONAL_MOIRE	EEC_LGTPAT_DIRECTIONAL_MOIRE	Directional moire.	NR
6	FIXED	EEC_LGTPAT_FIXED	A signal light that shows continuously, in any given direction, with constant luminous intensity and colour; fixed.	PR	[S57A, Attribute, LITCHR:1]
7	FIXED_ALTERNATING_FLASHING	EEC_LGTPAT_FIXED_ALTERNATING_FLASHING	A rhythmic light that shows continuously, in any given direction, with constant luminous intensity and colour, superimposed on which is a rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration but alternating in two or more colors; fixed and alternating flashing.	NR
8	FIXED_FLASHING	EEC_LGTPAT_FIXED_FLASHING	A rhythmic light that shows continuously, in any given direction, with constant luminous intensity and colour, superimposed on which is a rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration; fixed and flashing.	PR	[S57A, Attribute, LITCHR:13]
9	FIXED_GROUP_FLASHING	EEC_LGTPAT_FIXED_GROUP_FLASHING	A rhythmic light that shows continuously, in any given direction, with constant luminous intensity and colour, superimposed on which is a rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration and occur in groups; fixed/group-flashing.	NR
10	FIXED_LONG_FLASHING	EEC_LGTPAT_FIXED_LONG_FLASHING	A rhythmic light that shows continuously, in any given direction, with constant luminous intensity and colour, superimposed on which is a flashing light in which a single flash of not less than two seconds duration is regularly repeated; fixed/long-flashing.	IR	[S57A, Attribute, LITCHR:16]
11	FLASH_ALTERNATING	EEC_LGTPAT_FLASH_ALTERNATING	A rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration but alternating in two or more colors; flash alternating.	PR	[S57A, Attribute, LITCHR:19]
12	FLASHING	EEC_LGTPAT_FLASHING	A rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration.	PR	[S57A, Attribute, LITCHR:2]
13	FLASHING_LONG_FLASH	EEC_LGTPAT_FLASHING_LONG_FLASH	A rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration excepting the final one, which is longer; flashing/long-flash.	IR	[S57A, Attribute, LITCHR:14]
14	GROUP_ALTERNATING	EEC_LGTPAT_GROUP_ALTERNATING	A rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration and occur in groups but alternating in two or more colors; group alternating.	PR	[S57A, Attribute, LITCHR:20]
15	GROUP_FLASHING	EEC_LGTPAT_GROUP_FLASHING	A rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration and occur in groups; group-flashing.	NR
16	GROUP_OCCULTING	EEC_LGTPAT_GROUP_OCCULTING	A rhythmic light in which the total duration of light in a period is clearly longer than the total duration of darkness, and the long duration light periods are separated by a single short duration light period; group-occulting.	NR
17	GROUP_QUICK_FLASH	EEC_LGTPAT_GROUP_QUICK_FLASH	A rhythmic light exhibiting very rapid regular alternations of light and darkness, with a repetition rate of not less than 50 flashes per minute but less than 80 flashes per minute, is interrupted by regularly repeated eclipses of constant and short duration; group quick-flash.	NR
18	GROUP_VERY_QUICK	EEC_LGTPAT_GROUP_VERY_QUICK	A rhythmic light exhibiting very rapid regular alternations of light and darkness, with a repetition rate of not less than 80 flashes per minute but less than 160 flashes per minute, is interrupted by regularly repeated eclipses of constant and short duration; group very quick-flash.	NR
19	INTENSIFIED	EEC_LGTPAT_INTENSIFIED	Intensified.	NR
20	INTERRUPTED_QUICK_FLASH	EEC_LGTPAT_INTERRUPTED_QUICK_FLASH	A rhythmic light in which the sequence of flashes, with a repetition rate of not less than 50 flashes per minute but less than 80 flashes per minute, is interrupted by regularly repeated eclipses of constant and long duration; interrupted quick-flash.	PR	[S57A, Attribute, LITCHR:9]
21	INTERRUPTED_ULTRA_QUICK	EEC_LGTPAT_INTERRUPTED_ULTRA_QUICK	A rhythmic light in which the ultra quick flashes (160 or more per minute) are interrupted at regular intervals by eclipses of long duration; interrupted ultra quick-flash.	PR	[S57A, Attribute, LITCHR:11]
22	INTERRUPTED_VERY_QUICK	EEC_LGTPAT_INTERRUPTED_VERY_QUICK	A rhythmic light in which the very rapid alterations of light and darkness are interrupted at regular intervals by eclipses of long duration; interrupted very quick-flash.	PR	[S57A, Attribute, LITCHR:10]
23	ISOPHASE	EEC_LGTPAT_ISOPHASE	A rhythmic light with all durations of light and darkness equal; isophase.	PR	[S57A, Attribute, LITCHR:7]
24	LIGHTED	EEC_LGTPAT_LIGHTED	Lighted.	NR
25	LONG_FLASHING	EEC_LGTPAT_LONG_FLASHING	A rhythmic light in which a single flash of not less than two seconds duration is regularly repeated; long-flashing.	PR	[S57A, Attribute, LITCHR:3]
26	LONG_FLASHING_ALTERNATING	EEC_LGTPAT_LONG_FLASHING_ALTERNATING	A rhythmic light in which a single flash of not less than two seconds duration is regularly repeated but alternating in two or more colors; long-flashing alternating.	PR	[S57A, Attribute, LITCHR:17]
27	MORSE_CODE	EEC_LGTPAT_MORSE_CODE	A rhythmic light in which appearances of light of two clearly different durations are grouped to represent a character or characters in the Morse code.	PR	[S57A, Attribute, LITCHR:12]
28	OCCULTING	EEC_LGTPAT_OCCULTING	A rhythmic light in which the total duration of light in a period is clearly longer than the total duration of darkness and all the eclipses are of equal duration; occulting.	PR	[S57A, Attribute, LITCHR:8]
29	OCCULTING_ALTERNATING	EEC_LGTPAT_OCCULTING_ALTERNATING	A rhythmic light in which the total duration of light in a period is clearly longer than the total duration of darkness and all the eclipses are of equal duration but alternating in two or more colors; occulting alternating.	PR	[S57A, Attribute, LITCHR:17]
30	OCCULTING_FLASH	EEC_LGTPAT_OCCULTING_FLASH	A rhythmic light in which the total duration of light in a period is clearly longer than the total duration of darkness and all the eclipses are of equal duration, superimposed on which is a rhythmic light in which the total duration of light in a period is clearly shorter than the total duration of darkness and all of the appearances of light are of equal duration; occulting/flash.	IR	[S57A, Attribute, LITCHR:15]
31	QUICK_FLASH	EEC_LGTPAT_QUICK_FLASH	A rhythmic light exhibiting, without interruption, very rapid regular alternations of light and darkness with a repetition rate of not less than 50 flashes per minute but less than 80 flashes per minute.	PR	[S57A, Attribute, LITCHR:4]
32	QUICK_PLUS_LONG_FLASH	EEC_LGTPAT_QUICK_PLUS_LONG_FLASH	A rhythmic light exhibiting, without interruption, very rapid regular alternations of light and darkness with a repetition rate of not less than 50 flashes per minute but less than 80 flashes per minute, and all of the appearances of light are of equal duration excepting the final one, which is longer; quick-flash plus long-flash.	PR	[S57A, Attribute, LITCHR:25]
33	THREE_FIXED_HORIZONTAL	EEC_LGTPAT_THREE_FIXED_HORIZONTAL	3 fixed (horizontal).	PR	[S57A, Attribute, LITCHR:24]
34	THREE_FIXED_VERTICAL	EEC_LGTPAT_THREE_FIXED_VERTICAL	3 fixed (vertical).	PR	[S57A, Attribute, LITCHR:23]
35	TWO_FIXED_HORIZONTAL	EEC_LGTPAT_TWO_FIXED_HORIZONTAL	2 fixed (horizontal).	PR	[S57A, Attribute, LITCHR:22]
36	TWO_FIXED_VERTICAL	EEC_LGTPAT_TWO_FIXED_VERTICAL	2 fixed (vertical).	PR	[S57A, Attribute, LITCHR:21]
37	ULTRA_PLUS_LONG_FLASH	EEC_LGTPAT_ULTRA_PLUS_LONG_FLASH	A rhythmic light exhibiting, without interruption, very rapid regular alternations of light and darkness with a repetition rate of not less than 160 flashes per minute, and all of the appearances of light are of equal duration excepting the final one, which is longer; ultra quick-flash plus long-flash.	PR	[S57A, Attribute, LITCHR:27]
38	ULTRA_QUICK_FLASH	EEC_LGTPAT_ULTRA_QUICK_FLASH	A rhythmic light in which flashes are repeated at a rate of not less than 160 flashes per minute.	PR	[S57A, Attribute, LITCHR:6]
39	UNLIGHTED	EEC_LGTPAT_UNLIGHTED	Unlighted.	NR
40	VERY_QUICK_FLASH	EEC_LGTPAT_VERY_QUICK_FLASH	A rhythmic light in which flashes are repeated at a rate of not less than 80 flashes per minute but less than 160 flashes per minute.	PR	[S57A, Attribute, LITCHR:5]
41	VERY_QUICK_PLUS_LONG_FLASH	EEC_LGTPAT_VERY_QUICK_PLUS_LONG_FLASH	A rhythmic light exhibiting, without interruption, very rapid regular alternations of light and darkness with a repetition rate of not less than 80 flashes per minute but less than 160 flashes per minute, and all of the appearances of light are of equal duration excepting the final one, which is longer; very quick-flash plus long-flash.	PR	[S57A, Attribute, LITCHR:25]

EDCS Group Labels: LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_PERIOD

EDCS Attribute Code: 485

Definition:
The time occupied by an entire cycle of intervals of light and dark of a <LIGHT>; the light period.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: TIME

EDCS Group Labels: LIGHTING_AND_VISIBILITY, TIME

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_RELATIVE_POSITION

EDCS Attribute Code: 486

Definition:
The relative horizontal <LOCATION> of a <LIGHT> in a range of two or three <LIGHT>s.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	FRONT	EEC_LGTRELPOS_FRONT	Front.	NR
2	MIDDLE	EEC_LGTRELPOS_MIDDLE	Middle.	NR
3	REAR	EEC_LGTRELPOS_REAR	Rear.	NR
4	SHARED	EEC_LGTRELPOS_SHARED	Shared.	NR

EDCS Group Labels: HYDROGRAPHIC_TRNSP, LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_SECTOR_ANGLE

EDCS Attribute Code: 487

Definition:
The horizontal angular sector limits of the visibility of a <LIGHT>; limits of sectors and arcs of visibility are arranged clockwise and are given from seaward toward the <LIGHT>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PLANE_ANGLE

EDCS Group Labels: ABSTRACT_CONCEPT, ANGULAR_MEASURE, HYDROGRAPHIC_TRNSP, LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_SUPERVISED

EDCS Attribute Code: 488

Definition:
Indication that a <LIGHT> is supervised.

EDCS Attribute Value Data Type: LOGICAL

EDCS Group Labels: ANCILLARY_ARTEFACT, LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_VISIBILITY

EDCS Attribute Code: 489

Definition:
The type of specific visibility of a <LIGHT>, with respect to the <LIGHT>'s intensity and ease of recognition.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	DELIBERATELY_RESTRICTED	EEC_LGTVIS_DELIBERATELY_RESTRICTED	A light sector is deliberately reduced in intensity, for example to reduce its effect on a built-up region.	IR	[S57A, Attribute, LITVIS:6]
2	FAINT	EEC_LGTVIS_FAINT	A decrease in the apparent intensity of a light, which may occur in the case of partial obstructions.	PR	[S57A, Attribute, LITVIS:3]
3	HIGH_INTENSITY	EEC_LGTVIS_HIGH_INTENSITY	Non-marine lights with a higher power than marine lights and visible from well off shore (often "Aero" lights).	PR	[S57A, Attribute, LITVIS:1]
4	INTENSIFIED	EEC_LGTVIS_INTENSIFIED	A light in a sector is intensified (i.e., has longer range than other sectors).	PR	[S57A, Attribute, LITVIS:4]
5	LOW_INTENSITY	EEC_LGTVIS_LOW_INTENSITY	Non-marine lights with lower power than marine lights.	PR	[S57A, Attribute, LITVIS:2]
6	OBSCURED	EEC_LGTVIS_OBSCURED	The arc of a light sector, as designated by its limiting bearings in which the light is not visible from seaward, is obscured.	IR	[S57A, Attribute, LITVIS:7]
7	PARTIALLY_OBSCURED	EEC_LGTVIS_PARTIALLY_OBSCURED	Parts of the sector are obscured.	IR	[S57A, Attribute, LITVIS:8]
8	UNINTENSIFIED	EEC_LGTVIS_UNINTENSIFIED	A light in a sector is unintensified (i.e., has shorter range than other sectors).	PR	[S57A, Attribute, LITVIS:5]

EDCS Group Labels: LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHT_VISIBILITY_RANGES

EDCS Attribute Code: 490

Definition:
A set of two numbers for light ranges of visibility (at a <LIGHT>) expressed in nautical miles; formatted in a Latin-1 string as a pair of numbers separated by a slash (/) if only two visibilities exist, or by a dash (-) separating the greatest and least visibilities if three or more exist.

EDCS Attribute Value Data Type: CONSTRAINED_STRING

EDCS Group Labels: HYDROGRAPHIC_TRNSP, LIGHTING_AND_VISIBILITY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_CURRENT_STRENGTH

EDCS Attribute Code: 491

Definition:
The current strength of the first stroke of a <LIGHTNING> discharge.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: ELECTRIC_CURRENT

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_DATA_CONSISTENCY

EDCS Attribute Code: 492

Definition:
The quantity of the chi-square statistical agreement between cloud-to-ground <LIGHTNING> detection measurements; the lightning data consistency.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_DETECTOR_COUNT

EDCS Attribute Code: 493

Definition:
The quantity of detectors reporting a <LIGHTNING> discharge.

EDCS Attribute Value Data Type: COUNT

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_LOC_ERR_ELLPS_ANGLE

EDCS Attribute Code: 494

Definition:
The <<GEODETIC_AZIMUTH>> of the semi-major axis of the <LOCATION> error ellipse for a lightening stroke.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PLANE_ANGLE

EDCS Group Labels: ANGULAR_MEASURE, ATMOSPHERE, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_LOC_ERR_ELLPS_MAJOR_AXIS

EDCS Attribute Code: 495

Definition:
The dimension of the semi-major axis of the <LOCATION> error ellipse for a <LIGHTNING> stroke.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ATMOSPHERE, DIMENSION, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_LOC_ERR_ELLPS_MINOR_AXIS

EDCS Attribute Code: 496

Definition:
The dimension of the semi-minor axis of the <LOCATION> error ellipse for a <LIGHTNING> stroke.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ATMOSPHERE, DIMENSION, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_POLARITY

EDCS Attribute Code: 497

Definition:
The polarity of a <LIGHTNING> stroke.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	NEGATIVE	EEC_LGTNINGPOL_NEGATIVE	The polarity at a point along or within the lightning channel is negative.	IR	[GENM]
2	POSITIVE	EEC_LGTNINGPOL_POSITIVE	The polarity at a point along or within the lightning channel is positive.	IR	[GENM]

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_PROBABILITY

EDCS Attribute Code: 498

Definition:
The probability that <LIGHTNING> will occur.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_STROKE_COUNT

EDCS Attribute Code: 499

Definition:
The number of <LIGHTNING> strokes that constitute a single <LIGHTNING> discharge.

EDCS Attribute Value Data Type: COUNT

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIGHTNING_TIME_ADJUSTMENT

EDCS Attribute Code: 500

Definition:
The quantity of time added to the observation time of a <LIGHTNING> stroke to account for increased accuracy.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: TIME

EDCS Group Labels: ATMOSPHERE, EM_PHENOMENON, TIME

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LINEAR_ATTENUATION_COEFFICIENT

EDCS Attribute Code: 501

Definition:
The coefficient denoting the rate of reduction in value over the unit length; the linear attenuation coefficient.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: INV_LENGTH

EDCS Group Labels: ABSTRACT_CONCEPT, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIQUID_CAPACITY

EDCS Attribute Code: 502

Definition:
The amount of liquid an <OBJECT> is capable of carrying, storing, or delivering; capacity.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: VOLUME

EDCS Group Labels: SHELTER, VEHICLE

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LITTORAL_CURRENT_U_SPEED

EDCS Attribute Code: 503

Definition:
The U component (planetary geodetic west-east direction, where east is positive) of the speed of the <SURF_ZONE> <WATER_CURRENT>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: SPEED

EDCS Group Labels: WATER_BODY_SURFACE, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LITTORAL_CURRENT_V_SPEED

EDCS Attribute Code: 504

Definition:
The V component (planetary geodetic south-north direction, where north is positive) of the speed of the <SURF_ZONE> <WATER_CURRENT>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: SPEED

EDCS Group Labels: WATER_BODY_SURFACE, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIVING_ORGANISM_COMMON_NAME

EDCS Attribute Code: 505

Definition:
A common name for a <LIVING_ORGANISM>; a common name.

EDCS Attribute Value Data Type: STRING

EDCS Group Labels: ANIMAL, LIVING_ORGANISM, PLANT

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LIVING_ORGANISM_SCIENTIFIC_NAME

EDCS Attribute Code: 506

Definition:
A two-part Latinized name for a <LIVING_ORGANISM>, consisting of a capitalized generic name followed by a usually non-capitalized specific epithet; a scientific name or a binomial name.

EDCS Attribute Value Data Type: STRING

EDCS Group Labels: ANIMAL, LIVING_ORGANISM, PLANT

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOAD_CLASS_ONE_WAY_TRACKED

EDCS Attribute Code: 507

Definition:
The weight bearing capacity of a <BRIDGE> or <BRIDGE_SPAN> for one way tracked traffic; also known as the military load classification, Type 3.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: MASS

EDCS Group Labels: LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOAD_CLASS_ONE_WAY_WHEELED

EDCS Attribute Code: 508

Definition:
The weight bearing capacity of a <BRIDGE> or <BRIDGE_SPAN> for one way wheeled traffic; also known as the military load classification, Type 1.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: MASS

EDCS Group Labels: LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOAD_CLASS_TWO_WAY_TRACKED

EDCS Attribute Code: 509

Definition:
The weight bearing capacity of a <BRIDGE> or <BRIDGE_SPAN> for two way tracked traffic; also known as the military load classification, Type 4.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: MASS

EDCS Group Labels: LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOAD_CLASS_TWO_WAY_WHEELED

EDCS Attribute Code: 510

Definition:
The weight bearing capacity of a <BRIDGE> or <BRIDGE_SPAN> for two way wheeled traffic; also known as the military load classification, Type 2.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: MASS

EDCS Group Labels: LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOCAL_AZIMUTH

EDCS Attribute Code: 511

Definition:
The <<VECTOR_AZIMUTH_LOCAL>> in the horizontal plane at the observer's location from an azimuthal reference vector, to either a line passing through the observer, or a vector relative to the observer, or the direction from the observer to an <OBJECT> or <LOCATION>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PLANE_ANGLE

EDCS Group Labels: ANGULAR_MEASURE

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LONGEST_BRIDGE_SPAN_LENGTH

EDCS Attribute Code: 512

Definition:
The length of the longest <BRIDGE_SPAN> of a <BRIDGE>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, LAND_TRNSP

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOW_CLOUD_BASE_ALTITUDE

EDCS Attribute Code: 513

Definition:
The altitude of the base of a low level <CLOUD> layer, relative to a specified <SURFACE_DATUM>; the base of a <CLOUD> is defined as the lowest level in which the type of obscuration changes from that corresponding to clear <AIR> or haze to that corresponding to <WATER> droplets or <ICE> crystals.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ATMOSPHERE, DIMENSION, POSITION

Reference Type: IR

References: [WMO407], [WMO8]

EDCS Attribute Symbolic Constant: EAC_LOW_CLOUD_COVERAGE

EDCS Attribute Code: 514

Definition:
The fraction of the sky dome that is covered by all low level <CLOUD>s, as observed from a <PLANETARY_SURFACE>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: PURE_NUMBER

EDCS Group Labels: ATMOSPHERE, RATE_OR_RATIO

Reference Type: IR

References: [WMO407], [WMO8]

EDCS Attribute Symbolic Constant: EAC_LOW_CLOUD_COVERAGE_CLIMATOLOGY

EDCS Attribute Code: 515

Definition:
The quantity of historical (climatology) occurrences of low level <CLOUD> coverage, as observed from a <PLANETARY_SURFACE>, for a defined period of record.

EDCS Attribute Value Data Type: COUNT

EDCS Group Labels: ATMOSPHERE

Reference Type: IR

References: [GMET]

EDCS Attribute Symbolic Constant: EAC_LOW_CLOUD_TOP_ALTITUDE

EDCS Attribute Code: 516

Definition:
The altitude of the top of a low level <CLOUD> layer, relative to a specified <SURFACE_DATUM>; the top of a <CLOUD> is defined as the highest level in which the type of obscuration changes from that corresponding to <WATER> droplets or <ICE> crystals to that corresponding to clear <AIR> or haze.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ATMOSPHERE, DIMENSION, POSITION

Reference Type: IR

References: [WMO407], [GMET]

EDCS Attribute Symbolic Constant: EAC_LOW_CLOUD_TYPE_GENERA

EDCS Attribute Code: 517

Definition:
The genera of low level <CLOUD>s.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	CUMULONIMBUS	EEC_LOWCLDTYGENA_CUMULONIMBUS	Heavy and dense cloud, with considerable vertical extent, in the form of a mountain or huge towers; at least part of its upper portion is usually smooth, or fibrous or striated, and nearly always flattened; this part often spreads out in the shape of an anvil or vast plume.	IR	[WMO407]
2	CUMULUS	EEC_LOWCLDTYGENA_CUMULUS	Detached clouds, generally dense and with sharp outlines, developing vertically in the form of rising mounds, domes or towers, of which the bulging upper part often resembles cauliflower; the sunlit parts of these clouds are mostly brilliant white; the base is relatively dark and nearly horizontal.	IR	[WMO407]
3	NONE_PRESENT	EEC_LOWCLDTYGENA_NONE_PRESENT	No low clouds present.	NR
4	STRATOCUMULUS	EEC_LOWCLDTYGENA_STRATOCUMULUS	Gray or whitish, or both gray and whitish, patch, sheet or layer or cloud which almost always has dark parts, composed of tessellations, rounded masses, rolls, etc., which are non-fibrous (except for virga) and which may or may not be merged; most of the regularly arranged small elements have an apparent width of more than 5 degrees.	IR	[WMO407]
5	STRATUS	EEC_LOWCLDTYGENA_STRATUS	Generally gray cloud layer with a fairly uniform base, which may give drizzle, ice prisms, or snow grains. When sun is visible through the cloud, its outline is clearly discernible; does not produce halo phenomena except possibly, at very low temperatures.	IR	[WMO407]

EDCS Group Labels: ATMOSPHERE

Reference Type: IR

References: [WMO407]

EDCS Attribute Symbolic Constant: EAC_LOW_CLOUD_TYPE_OBSERVED

EDCS Attribute Code: 518

Definition:
The type of observed low level <CLOUD>s.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	NO_LOW_CLOUDS	EEC_LOWCLDTYOBV_NO_LOW_CLOUDS	No low clouds.	NR
2	CUMULUS_HUMULIS	EEC_LOWCLDTYOBV_CUMULUS_HUMULIS	Cumulus humulis or cumulus fractus other than of bad weather or both.	NR
3	CUMULUS_MEDIOCRIS	EEC_LOWCLDTYOBV_CUMULUS_MEDIOCRIS	Cumulus mediocris or congestus, with or without cumulus of species fractus or humulis or stratocumulus all having their bases at the same level.	NR
4	CMNIMB_CALVUS	EEC_LOWCLDTYOBV_CMNIMB_CALVUS	Cumulonimbus calvus, with or without cumulus, stratocumulus or stratus.	NR
5	STRATCM_CUMULOGEN	EEC_LOWCLDTYOBV_STRATCM_CUMULOGEN	Stratocumulus cumulogenitus.	NR
6	STRATCM_OTHER	EEC_LOWCLDTYOBV_STRATCM_OTHER	Stratocumulus other than stratocumulus cumulogenitus.	NR
7	STRATUS_NEBULOSUS	EEC_LOWCLDTYOBV_STRATUS_NEBULOSUS	Stratus nebulosus or stratus fractus other than of bad weather, or both.	NR
8	STRATUS_FRACTUS	EEC_LOWCLDTYOBV_STRATUS_FRACTUS	Stratus fractus or cumulus fractus of bad weather, or both (pannus) usually below altostratus or nimbostratus.	NR
9	CUMULUS_AND_STRATO	EEC_LOWCLDTYOBV_CUMULUS_AND_STRATO	Cumulus and stratocumulus other than stratocumulus cumulogenitus, with bases at different levels.	NR
10	CMNIMB_CAPILLATUS	EEC_LOWCLDTYOBV_CMNIMB_CAPILLATUS	Cumulonimbus capillatus (often with an anvil), with or without cumulonimbus calvus, cumulus, stratocumulus, stratus or pannus.	NR
11	LOW_CLOUDS_INVISIBLE	EEC_LOWCLDTYOBV_LOW_CLOUDS_INVISIBLE	Low clouds invisible owing to darkness, fog, blowing dust or <SAND>, or other similar phenomena.	NR

EDCS Group Labels: ATMOSPHERE

Reference Type: IR

References: [WMO407]

EDCS Attribute Symbolic Constant: EAC_LOWEST_AIRSPACE_ALTITUDE

EDCS Attribute Code: 519

Definition:
The altitude of the lowest portion of the <AIRSPACE>, relative to the AGL <SURFACE_DATUM>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: AIR_TRNSP, DIMENSION, POSITION

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOWEST_AIRSPACE_ALTITUDE_LIMIT

EDCS Attribute Code: 520

Definition:
The <<LOWEST_AIRSPACE_ALTITUDE>> limit.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: AIR_TRNSP, DEMARCATION, DIMENSION, POSITION

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOWEST_CLOUD_BASE_ALTITUDE

EDCS Attribute Code: 521

Definition:
The altitude of the base of the lowest <CLOUD>, relative to the AGL <SURFACE_DATUM>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: ATMOSPHERE, DIMENSION, POSITION

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOWEST_CLOUD_COVERAGE

EDCS Attribute Code: 522

Definition:
The fraction of the celestial dome covered by low <CLOUD>s.

EDCS Attribute Value Data Type: ENUMERATION

Code	Label	Symbolic constant	Definition	Reference type	References
1	NONE_PRESENT	EEC_LOWESTCLDCOV_NONE_PRESENT	No fraction of celestial dome covered.	NR
2	ONE_OKTA	EEC_LOWESTCLDCOV_ONE_OKTA	One OKTA or 1/10 or less but not zero.	NR
3	TWO_OKTA	EEC_LOWESTCLDCOV_TWO_OKTA	Two OKTAs or 2/10 to 3/10, or few.	NR
4	THREE_OKTA	EEC_LOWESTCLDCOV_THREE_OKTA	Three OKTAs or 4/10.	NR
5	FOUR_OKTA	EEC_LOWESTCLDCOV_FOUR_OKTA	Four OKTAs or 5/10, or scattered.	NR
6	FIVE_OKTA	EEC_LOWESTCLDCOV_FIVE_OKTA	Five OKTAs or 6/10.	NR
7	SIX_OKTA	EEC_LOWESTCLDCOV_SIX_OKTA	Six OKTAs or 7/10 to 8/10.	NR
8	SEVEN_OKTA	EEC_LOWESTCLDCOV_SEVEN_OKTA	Seven OKTAs or 9/10 or more but not 10/10, or broken.	NR
9	EIGHT_OKTA	EEC_LOWESTCLDCOV_EIGHT_OKTA	Eight OKTAs or 10/10, or overcast.	NR
10	PARTIAL_OBSCURATION	EEC_LOWESTCLDCOV_PARTIAL_OBSCURATION	Partial obscuration.	NR
11	SKY_OBSCURED	EEC_LOWESTCLDCOV_SKY_OBSCURED	Sky obscured by fog and/or other meteorological phenomena.	NR

EDCS Group Labels: ATMOSPHERE, RATE_OR_RATIO

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOWEST_ELEVATION

EDCS Attribute Code: 523

Definition:
The elevation above a specified <SURFACE_DATUM> to the lowest portion of an <OBJECT>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, POSITION

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LOWEST_GROUND_WATER_LEVEL

EDCS Attribute Code: 524

Definition:
The lowest annual mean level of ground <WATER>.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, HYDROLOGY

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LUMINOUS_LIGHT_RANGE

EDCS Attribute Code: 525

Definition:
The maximum distance at which a <LIGHT> can be seen under existing visibility conditions, taking no account of the elevation of the <LIGHT>, the observer's height of eye, the curvature of the <EARTH>, or interference from background <LIGHTING>; luminous light range.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: LENGTH

EDCS Group Labels: DIMENSION, LIGHTING_AND_VISIBILITY

Reference Type: IR

References: [BOWD]

EDCS Attribute Symbolic Constant: EAC_LUNAR_DIFFUSED_IRRADIANCE

EDCS Attribute Code: 526

Definition:
The diffused lunar incident flux (irradiance) per unit of an <OBJECT>'s <SURFACE> area.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: IRRADIANCE

EDCS Group Labels: EM_PHENOMENON, SPACE

Reference Type: NR

References: none

EDCS Attribute Symbolic Constant: EAC_LUNAR_DIRECT_IRRADIANCE

EDCS Attribute Code: 527

Definition:
The direct lunar incident flux (irradiance) per unit of an <OBJECT>'s <SURFACE> area.

EDCS Attribute Value Data Type: REAL

EDCS Unit Equivalence Class Label: IRRADIANCE

EDCS Group Labels: EM_PHENOMENON, SPACE

Reference Type: NR

References: none