Table 6.26 -- EDCS attributes whose label begins with V

Label Definition Attribute value type EQ label Code
VARIABLE_SEA_STATE_FRACTION A number between 0 and 1 representing the linearly-scaled fraction of <<SEA_STATE_CATEGORY>> reports indicating varying <<SEA_STATE_CATEGORY>>; the variable sea state fraction. REAL PURE_NUMBER 1494
VARIABLE_WIND_END_DIRECTION The <<GEODETIC_AZIMUTH>> of the ending extreme in <<WIND_DIRECTION>> under variable <<WIND_DIRECTION>> conditions. Variable <<WIND_DIRECTION>> are normally only reported for <<WIND_SPEED>>s exceeding 3,09 metres per second (six knots) and the variability must equal or exceed a range of 60 arc degrees during the preceding two minutes. REAL PLANE_ANGLE 1495
VARIABLE_WIND_START_DIRECTION The <<GEODETIC_AZIMUTH>> of the starting extreme in <<WIND_DIRECTION>> under variable <<WIND_DIRECTION>> conditions. Variable <<WIND_DIRECTION>> are normally only reported for <<WIND_SPEED>>s exceeding 3,09 metres per second (six knots) and the variability must equal or exceed a range of 60 arc degrees during the preceding two minutes. REAL PLANE_ANGLE 1496
VECTOR_AZIMUTH_GEODETIC The smallest angle from vector A to vector B where A is a particular reference vector fixed in the surface plane (generally the local x-y plane, perpendicular to the local normal) and defined by the projection onto this plane of the vector toward Geodetic north and B is the projection onto the surface plane of the vector of interest. The positive sense is clockwise when looking in the <DIRECTION> of the cross product AxB. REAL PLANE_ANGLE 1497
VECTOR_AZIMUTH_LOCAL The smallest angle from vector A to vector B where A is a reference vector (usually the local x-axis) fixed in the surface plane (generally the local x-y plane, perpendicular to the local normal) and B is the projection onto the surface plane of the vector of interest. The positive sense is clockwise when looking in the <DIRECTION> of the cross product AxB. REAL PLANE_ANGLE 1498
VECTOR_AZIMUTH_MAGNETIC The smallest angle from vector A to vector B where A is the reference vector with origin in the surface plane (generally the local x-y plane, perpendicular to the local normal) defined by the projection onto this plane of the vector toward Magnetic north and B is the projection onto the surface plane of the vector of interest. The positive sense is clockwise when looking in the <DIRECTION> of the cross product AxB. REAL PLANE_ANGLE 1499
VECTOR_ELEV_ANGLE_HORIZONTAL The <<VECTOR_ELEV_ANGLE_LOCAL>> with respect to the local horizontal plane. REAL PLANE_ANGLE 1500
VECTOR_ELEV_ANGLE_LOCAL The smallest angle from vector A to vector B where B is the vector of interest and A is the projection of B on the surface plane (generally the local x-y plane, perpendicular to the local normal); the elevation angle. The positive sense is clockwise when looking in the <DIRECTION> of the cross product AxB. REAL PLANE_ANGLE 1501
VEGETATION_RESTRICTED_SPEED A number between 0 and 1 inclusive representing the linearly-scaled fractional restriction of the speed of ground <VEHICLE>s as a fraction of maximum speed. Zero means no restriction (maximum speed) and one means completely restricted and immobilized. REAL PURE_NUMBER 1502
VEGETATION_TYPE The type of <VEGETATION>. ENUMERATION   1503
VEHICLE_CAPACITY The number of <VEHICLE>s that an <OBJECT> can accommodate; the vehicle capacity. COUNT   1504
VEHICLE_MAINTENANCE_AVAILABLE The type of vehicle maintenance <FACILITY>s available at a <LOCATION> or in the near vicinity. ENUMERATION   1505
VEHICLE_MARKING The marking displayed on a <VEHICLE>, typically including echelon designation and coded bumper number. The marking is formatted in a Basic Latin string containing twelve characters as specified by [EBEV, Section 4.5, Entity Marking - Character Set]. CONSTRAINED_STRING   1506
VEHICLE_SMOKE_TYPE The type or origin of <SMOKE> from a <VEHICLE>. ENUMERATION   1507
VEHICLE_STORAGE_AREA The total <<AREA>> of a <STRUCTURE> which can be used for the storage of <VEHICLE>s. REAL AREA 1508
VEHICLE_STORAGE_DOOR_PRI-
_HEIGHT 		The height of the primary <STRUCTURE_ENTRANCE_AND_OR_EXIT> for <VEHICLE>s. REAL LENGTH 1509
VEHICLE_STORAGE_DOOR_PRI_WIDTH The width of the primary <STRUCTURE_ENTRANCE_AND_OR_EXIT> for <VEHICLE>s. REAL LENGTH 1510
VEHICLE_TRAFFIC_FLOW The type of flow-pattern of <VEHICLE>s on a <TRANSPORTATION_ROUTE>; the vehicle traffic flow. ENUMERATION   1511
VEHICLE_TRAFFIC_GEODETIC-
_DIRECTION 		The <<GEODETIC_AZIMUTH>> of the <DIRECTION> of <VEHICLE>s on a <TRANSPORTATION_ROUTE>; the vehicle traffic geodetic direction. REAL PLANE_ANGLE 1512
VEHICULAR_SPEED_LIMIT The maximum speed legally permitted on a given stretch of a <TERRAIN_TRANSPORTATION_ROUTE>; the vehicular speed limit. REAL SPEED 1513
VENTILATION_FILTER_EFFICIENCY The fraction of <PARTICLE>s in the <AIR> removed as the <AIR> makes a single pass through ventilation filters; the ventilation filter efficiency. REAL SURFACE_DENSITY 1514
VENTILATION_INFILTRATION_RATE The rate at which a ventilation <SYSTEM> draws in exterior <AIR>. The rate is expressed as the fraction of the <<VOLUME>> of <AIR> in the <STRUCTURE> drawn in per unit time. REAL RATE 1515
VERTICAL_CLEARANCE_CLOSED The vertical clearance of an <OBJECT> (for example: a closed lifting <BRIDGE>) in its closed condition measured from the ground <SURFACE> underneath to the <OBJECT> overhead. REAL LENGTH 1516
VERTICAL_CLEARANCE_OPENED The vertical clearance of an <OBJECT> (for example: a opened lifting <BRIDGE>>) in its opened condition measured from the ground <SURFACE> underneath to the <OBJECT> overhead. REAL LENGTH 1517
VERTICAL_CLEARANCE_SAFE The safe vertical clearance of an <OBJECT> measured from the ground <SURFACE> underneath to the <OBJECT> overhead. REAL LENGTH 1518
VERTICAL_DATUM The <SURFACE_DATUM> to which elevations and heights are referenced; often taken to correspond to MSL; the vertical datum. ENUMERATION   1519
VERTICAL_LOAD_BEARING_CAPACITY The maximum distributed load per unit cross-section a vertical <OBJECT> can support; the vertical load bearing capacity. REAL SURFACE_DENSITY 1520
VERTICAL_MEASUREMENT_QUALITY The quality of a vertical measurement. ENUMERATION   1521
VERTICAL_OBSTRUCTION-
_IDENTIFIER 		The identifier of an <OBJECT> that is a vertical obstruction to low-level flight. The identifier is formatted in a Basic Latin string as follows: characters [1-2] indicating the [F10-4, "Country code"], characters [3-6] indicating the [I8697, "WAC Identifier"], characters [7-10] indicating the Unique Obstruction Identification Number, and character [11] indicating the Producer Code. CONSTRAINED_STRING   1522
VERTICAL_PASSAGE_ENCLOSED An indication that a vertical passage (for example: a <RAMP>, a<STAIR>, or an <ESCALATOR>) in a <STRUCTURE> is fully enclosed by <WALL>s on both sides. BOOLEAN   1523
VESSEL_DENSITY The areal density of <WATER_SURFACE_VESSEL>s in a specified <REGION> of a <WATER_BODY_SURFACE>. REAL AREAL_ENTITY_DENSITY 1524
VESSEL_DENSITY_ACOUSTIC-
_LEVEL_CATEGORY 		The category of <<VESSEL_DENSITY>>, determined according to induced ambient acoustic noise levels in a <WATER_BODY>. ENUMERATION   1525
VESSEL_FUNCTION The operating function of a <VESSEL>. ENUMERATION   1526
VESSEL_IDENTIFIER An identifier of a <VESSEL>. The format and values of the identifier are specified by a <<VESSEL_IDENTIFIER_VALUE_SET>>. CONSTRAINED_STRING   1527
VESSEL_IDENTIFIER_VALUE_SET The value <SET> of a formatted <<VESSEL_IDENTIFIER>>. ENUMERATION   1528
VESSEL_LOAD_RESTRICTIONS The description of any load restrictions that apply to <VESSEL>s using a <MARINE_ROUTE> or marine <FACILITY>. STRING   1529
VESSEL_TYPE The type of a <VESSEL>. ENUMERATION   1530
VIEW_OPENING_PRESENT An indication that an <OBJECT> contains a view <APERTURE> (for example: a peephole or small <WINDOW> in a <DOOR>). BOOLEAN   1531
VIRTUAL_AIR_TEMPERATURE In a <SYSTEM> of moist <AIR>, the <<AIR_TEMPERATURE>> of dry <AIR> having the same <<AIR_DENSITY>> and <<ATM_PRESSURE>> as the moist <AIR>; the virtual air temperature. REAL THERMO_TEMPERATURE 1532
VISIBILITY_DISTANCE The greatest distance in a given <DIRECTION> at which it is just possible to see and identify with the unaided eye either: (1) in the daytime, a prominent dark <OBJECT> against the sky at the horizon or (2) at night, a known, preferably unfocused, moderately intense <LIGHT>; visibility distance. REAL LENGTH 1533
VISIBILITY_DISTANCE_QUALITY The quality of a <<VISIBILITY_DISTANCE>> observation. ENUMERATION   1534
VISIBILITY_DISTANCE_VARIABLE An indication that a reported <<VISIBILITY_DISTANCE>> observation is variable. BOOLEAN   1535
VISUAL_CONTRAST The apparent visual contrast of an <OBJECT> expressed as a number between minus one (a totally dark <OBJECT>) and infinity (a very bright <OBJECT>) with zero representing an <OBJECT> with no apparent contrast. REAL PURE_NUMBER 1536
VISUAL_OPACITY A number between 0 and 1 inclusive representing the linearly-scaled fractional opacity (or alpha) of an <OBJECT> in the visual spectrum. The value is determined by how much light fails to penetrate through the <OBJECT>. Zero means that no light is blocked (all light penetrates) and one means that all light is blocked. REAL PURE_NUMBER 1537
VISUAL_REFLECTOR_PRESENT An indication that a visual reflector is present on an <AID_TO_NAVIGATION>. BOOLEAN   1538
VISUAL_WAVE_HEIGHT The mean apparent <<HEIGHT>> of <WATER_WAVE>s that is determined visually and measured from trough to crest; the visual wave height. REAL LENGTH 1539
VOLCANIC_FORMATION_TYPE The type of morphology of the <TERRAIN> created by volcanic activity; the volcanic formation type. ENUMERATION   1540
VOLTAGE_LEVEL The nominal voltage level of supplied electrical power to a transportation <SYSTEM>. REAL ELECTRIC_POTENTIAL 1541
VOLUME The internal volume of an <OBJECT>. REAL VOLUME 1542
VOLUME_BACKSCATTER_GRADIENT The negative of the depth gradient of the ratio of the flux returned (reflected directly back in the <DIRECTION> of incidence) to the incident flux (generally in decibels per metre of depth) for an <OBJECT>; the volume backscatter gradient. REAL POWER_LEVEL_DIFF_LEN_GRADIENT 1543

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