Table 6.27 — EAs with labels beginning with W
Label Concept definition Figure(s) Attribute value type EQ label Code
WAKE_INTENSITY A number between 0 and 1 inclusive representing the linearly-scaled fraction of the production rate, on a <WATERBODY_SURFACE>, of wakes induced by the movement of a <VESSEL> relative to <WATER_WAVE>s and <WATER_CURRENT>s; wake intensity. Zero means no wake at all and one means maximum intensity.   REAL PURE_NUMBER 1546
WALL_CONSTRUCTION_TYPE The type of <MATERIAL> and/or techniques used to construct a <WALL>; wall construction type.   ENUMERATION   1690
WALL_PREDOMINANT_PATTERN The predominant visual pattern of the exterior <SURFACE>s of the <EXTERIOR_WALL>s of a <STRUCTURE>.   ENUMERATION   1547
WALL_PREDOMINANT_SURFACE-
_MATERIAL
The predominant outermost <MATERIAL> covering the <SURFACE> of a <WALL>.   ENUMERATION   1548
WALL_STUD_DEPTH The dimension of the cross-section of a <WALL_STUD> that is perpendicular to the <SURFACE> of the associated <WALL>; wall stud depth.   REAL LENGTH 1706
WALL_TYPE The type of a <WALL>.   ENUMERATION   1549
WATER_ACOUSTIC_TRANS_LOSS-
_MODEL
A type of <<ACOUSTIC_TRANSMISSION_LOSS>> model or database for <WATERBODY>s.   ENUMERATION   1550
WATER_ATTENUATION_TURBIDITY A measurement of the reduction of transparency of a liquid caused attenuation due to by the presence of undissolved <MATERIAL>; water attenuation turbidity. The measurement shall be made in accordance with the procedures specified in 6.4 of ISO 7027:9999.   REAL PURE_NUMBER 1551
WATER_CHANNEL_SAFE-
_HORIZONTAL_CLEARANCE
The minimum safe horizontal distance between adjacent <STRUCTURE>s on either side of a <WATER_CHANNEL>.   REAL LENGTH 1572
WATER_CHANNEL_TYPE The type of a <WATER_CHANNEL>.   ENUMERATION   1573
WATER_CURRENT_APPEARANCE_MONTH The <<MONTH>> of appearance of a <WATER_CURRENT>.   ENUMERATION   1574
WATER_CURRENT_DIRECTION The <<GEODETIC_AZIMUTH>> of the <DIRECTION> of a <WATER_CURRENT>.   REAL PLANE_ANGLE 1575
WATER_CURRENT_DISAPPEARANCE-
_MONTH
The <<MONTH>> of disappearance of a <WATER_CURRENT>.   ENUMERATION   1576
WATER_CURRENT_REFERENCE The reference time of a measurement of a <WATER_CURRENT>.   ENUMERATION   1577
WATER_CURRENT_SPEED The <<SPEED>> of a <WATER_CURRENT>.   REAL SPEED 1578
WATER_CURRENT_TYPE The type of a <WATER_CURRENT>.   ENUMERATION   1579
WATER_DEPTH The depth of <WATER> from a <SURFACE_DATUM> to a <WATERBODY_FLOOR>, as a positive number.   REAL LENGTH 1580
WATER_DIFFUSE_TURBIDITY A measurement of the reduction of transparency of a liquid caused by diffusion due to the presence of undissolved <MATERIAL>; water diffuse turbidity. The measurement shall be made in accordance with the procedures specified in 6.3 of ISO 7027:9999.   REAL PURE_NUMBER 1581
WATER_GATE_TYPE The type of a <WATER_GATE>.   ENUMERATION   870
WATER_LEVEL_EFFECT The effect of surrounding <WATER> on an <OBJECT>; water level effect.   ENUMERATION   1582
WATER_OVERHEAD_OBSTRUCTION An indication that a <WATERBODY_ROUTE> has an <OVERHEAD_OBSTRUCTION>.   BOOLEAN   663
WATER_QUALITY The quality of <WATER> for drinking.   ENUMERATION   1583
WATER_TABLE_DEPTH The mean depth of a zone of saturation in the subsurface <TERRAIN> except where bounded by an impermeable body (for example: <ROCK>) in which no water table exists; water table depth.   REAL LENGTH 1584
WATER_TSS_COMPONENT The type of <COMPONENT> of a <WATER_TRAFFIC_SEPARATION_SCHEME>.   ENUMERATION   677
WATER_TYPE The type of available <WATER>.   ENUMERATION   1585
WATER_VAPOUR_PRESSURE The partial pressure of water vapour in an <ATMOSPHERE>.   REAL PRESSURE 1586
WATERBODY_ACOUSTIC_AMBIENT-
_NOISE_SPECTRAL_MODEL
A type of acoustic ambient noise spectral model or database for <WATERBODY>s.   ENUMERATION   1552
WATERBODY_BIOLUMINESCENCE The rate of photon emittance of visible light from <LIVING_ORGANISM>s in a <WATERBODY>; waterbody bioluminescence.   REAL VOLUMETRIC_ENTITY_EMIT_RATE 1553
WATERBODY_FLOOR_CLUTTER-
_DENSITY
The areal density of <OBJECT>s on a <WATERBODY_FLOOR_REGION> that appear to acoustic <SENSOR>s to be, but that are not, <EXPLOSIVE_MINE>s; waterbody floor clutter density.   REAL AREAL_ENTITY_DENSITY 1554
WATERBODY_FLOOR_CONFIGURATION The type of a <WATERBODY_FLOOR_TOPOGRAPHIC_CONFIGURATION>.   ENUMERATION   1555
WATERBODY_FLOOR_GRAZING_ANGLE The mean angle between the horizontal plane at a <WATERBODY_FLOOR> and the scattered acoustic rays; waterbody floor grazing angle.   REAL PLANE_ANGLE 1556
WATERBODY_FLOOR_MATERIAL_TYPE The predominant type of <MATERIAL> composing a <WATERBODY_FLOOR>.   ENUMERATION   1557
WATERBODY_FLOOR_MORPHOLOGY The morphology of a <WATERBODY_FLOOR>.   ENUMERATION   1558
WATERBODY_FLOOR_OBJECT_TYPE The type of a <TERRAIN_SURFACE_OBJECT> that is located on a <WATERBODY_FLOOR>.   ENUMERATION   1559
WATERBODY_FLOOR_ROUGHNESS-
_CATEGORY
A qualitative characterization of the roughness of a <WATERBODY_FLOOR> at spatial frequencies relevant to <EXPLOSIVE_MINE> detection; waterbody floor roughness category.   ENUMERATION   1560
WATERBODY_PROPERTY_SET-
_ACOUSTIC_TYPE
The type of the acoustic properties of a <WATERBODY_ACOUSTIC_PROPERTY_SET>.   ENUMERATION   1561
WATERBODY_ROUTE_TYPE The type of a <WATERBODY_ROUTE>.   ENUMERATION   670
WATERBODY_SOUND_SPEED The <<SOUND_SPEED>> in a <WATERBODY>.   REAL SPEED 1562
WATERBODY_SURFACE_DATA-
_OBSERVATION_METHOD
The method of observation, measurement, collection, prediction, or estimation of one or more characteristics of a <WATERBODY_SURFACE>; waterbody surface data observation method.   ENUMERATION   1563
WATERBODY_SURFACE_GRAZING-
_ANGLE
The mean angle between the horizontal plane at a <WATERBODY_SURFACE> and scattered acoustic rays; waterbody surface grazing angle.   REAL PLANE_ANGLE 1564
WATERBODY_SURFACE_ICE_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fractional <<AREA>> of a <WATERBODY_SURFACE> that is covered by <ICE>. Zero means no <ICE> is present and one means the <WATERBODY_SURFACE> is completely covered.   REAL PURE_NUMBER 1565
WATERBODY_SURFACE-
_INSTANTANEOUS_HEIGHT
The instantaneous height of a <WATERBODY_SURFACE> above a <VERTICAL_DATUM> or <SOUNDING_DATUM>. For <OCEAN>s and <SEA>s the <SOUNDING_DATUM> is defined as MSL corrected for the <TIDE>.   REAL LENGTH 1566
WATERBODY_SURFACE_TEMPERATURE The <<WATERBODY_TEMPERATURE>> measured, estimated, or predicted at or near a <WATERBODY_SURFACE>.   REAL THERMO_TEMPERATURE 1567
WATERBODY_SURFACE_U_WIND-
_STRESS
The U component (geodetic west-east direction, where east is positive) of the stress on a <WATERBODY_SURFACE> induced by <WIND>.   REAL MOMENTUM 1568
WATERBODY_SURFACE_V_WIND-
_STRESS
The V component (geodetic south-north direction, where north is positive) of the stress on a <WATERBODY_SURFACE> induced by <WIND>.   REAL MOMENTUM 1569
WATERBODY_SURFACE_WIND_STRESS The total stress on a <WATERBODY_SURFACE> induced by <WIND>.   REAL MOMENTUM 1570
WATERBODY_TEMPERATURE The <<TEMPERATURE>> of a <WATERBODY>.   REAL THERMO_TEMPERATURE 1571
WATERCOURSE_CHANNEL_TYPE The type of trough-like depression that is normally occupied by a <WATERCOURSE>; watercourse channel type.   ENUMERATION   1587
WATERCOURSE_GAP_WIDTH The predominant <<TERRAIN_GAP_WIDTH>>, measured between the tops of the first accessible breaks in slope above mean water level on each bank of a <WATERCOURSE>.   REAL LENGTH 1588
WATERCOURSE_SINK_TYPE The type of the sink of a <WATERCOURSE>.   ENUMERATION   1589
WAVE_SPECTRAL_DENSITY The power represented by a spectrum of <WATER_WAVE>s at a particular centre <<FREQUENCY>> and centre <DIRECTION>; wave spectral density.   REAL POWER 1590
WAVE_WHITECAP_RATE The rate of occurrence of <WATER_WAVE>s bearing whitecaps on their crests due to <WIND>.   REAL PURE_NUMBER 1591
WAVELENGTH The distance in a periodic wave between two points of corresponding phase in consecutive cycles; wavelength [AHD, "wavelength", 1].   REAL LENGTH 1592
WEAPONS_RANGE_TYPE The type of a <WEAPONS_RANGE>.   ENUMERATION   1594
WEATHER_MEASUREMENT_TECHNIQUE The technique or method of weather measurement.   ENUMERATION   1595
WELL_TYPE The type of a <WELL>.   ENUMERATION   1596
WET_BULB_AIR_TEMPERATURE The <<AIR_TEMPERATURE>> that a parcel of <AIR> would have, if cooled adiabatically at constant <<ATM_PRESSURE>> to the water vapour saturation point by evaporation of <WATER> into it, with all latent heat being supplied by the parcel of <AIR>; wet bulb air temperature.   REAL THERMO_TEMPERATURE 1597
WET_GAP_WIDTH The <<WATERCOURSE_GAP_WIDTH>> at low <TIDE>; wet gap width.   REAL LENGTH 1598
WET_SOIL_TRAFFICABILITY The <<SOIL_TYPE_USCS>> further categorized by its wet weather trafficability characteristics.   ENUMERATION   1599
WETLAND_SURFACE_FORM The type and/or structure of a <WETLAND>; wetland surface form.   ENUMERATION   1600
WIDTH The length of the shorter of two orthogonal linear axes of an <OBJECT>, measured in the horizontal plane; width. For a square <OBJECT>, either axis may be measured; for a round <OBJECT>, the diameter is measured. For a <BRIDGE>, the distance perpendicular to the axis between the <BRIDGE_PIER>s is measured.   REAL LENGTH 1601
WIND_ABSOLUTE_VORTICITY The vorticity of <WIND> determined with respect to an absolute coordinate system; wind absolute vorticity.   REAL ANGULAR_VELOCITY 1602
WIND_CALM_FRACTION_CLIMATOLOGY The historical (climatology) fraction of calm <<WIND_SPEED>>s (less than 2,575 metres per second or equivalently five knots).   REAL PURE_NUMBER 1603
WIND_CATEGORY A categorization of <WIND> based on <<WIND_SPEED>> and its variability; wind category.   ENUMERATION   1604
WIND_CHILL_TEMPERATURE_INDEX A means of quantifying the combined effect of low <<AIR_TEMPERATURE>> and <<WIND_SPEED>> on the body <<TEMPERATURE>> of <HUMAN>s that may result in hypothermia; wind chill temperature index. The value is expressed as an equivalent <<TEMPERATURE>> in degrees Celsius given by the formula:
13,1267 + (0,6215 · T) - (13,9468 · V0,16) + (0,4863 · T · V0,16)
where V is the <<WIND_SPEED>> in metres per second at a <<HEIGHT_AGL>> of 1,5 metres (approximately 5 feet) and T is the <<AIR_TEMPERATURE>> in degrees Celsius.
  REAL THERMO_TEMPERATURE 1605
WIND_CIRCULARITY_COEFFICIENT-
_CLIMATOLOGY
The historical (climatology) quantity of the ratio of the standard deviation of the <<WIND_SPEED_U>> to the standard deviation of the <<WIND_SPEED_V>>, for a defined period of record; wind circularity coefficient climatology.   REAL PURE_NUMBER 1606
WIND_DIRECTION The <<GEODETIC_AZIMUTH>> of the <DIRECTION> from which the <WIND> is blowing.   REAL PLANE_ANGLE 1607
WIND_DIRECTION_CLIMATOLOGY The mean historical (climatology) <<WIND_DIRECTION>>.   REAL PLANE_ANGLE 1608
WIND_DIRECTION_OCTANT-
_CLIMATOLOGY
The historical (climatology) <<WIND_DIRECTION>> categorized by cardinal vector octant (a 45 arc degree sector centred on a cardinal direction).   ENUMERATION   1609
WIND_DIRECTION_OCTANT_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fraction of observations reporting <<WIND_DIRECTION>>s within a cardinal vector octant (a 45 arc degree sector centred on a cardinal <DIRECTION>).   REAL PURE_NUMBER 1610
WIND_DIRECTION_QUALITY The quality of a <<WIND_DIRECTION>> measurement.   ENUMERATION   1611
WIND_DIRECTION_VARIABILITY The angular range of the <<WIND_DIRECTION>> during a relatively short reporting period; wind direction variability.   REAL PLANE_ANGLE 1612
WIND_DIVERGENCE_HORIZONTAL The horizontal expansion or spreading out of the vector field of the <WIND>; wind divergence horizontal.   REAL RATE 1613
WIND_GALE_FORCE_RATE-
_CLIMATOLOGY
A number between 0 and 1 inclusive representing the linearly-scaled fraction of historical (climatology) <<WIND_SPEED>>s greater than or equal to 17,49 metres per second (34 knots); wind gale force rate climatology. Zero means no <<WIND_SPEED>>s are of gale force and one means that all <<WIND_SPEED>>s reported are of gale force.   REAL PURE_NUMBER 1615
WIND_GUST_SPEED The <<SPEED>> of a sudden, brief increase in <<WIND_SPEED>>; wind gust speed.   REAL SPEED 1616
WIND_GUST_SPREAD The difference between adjacent peaks and lulls in <<WIND_SPEED>>; wind gust spread.   REAL SPEED 1617
WIND_MEASUREMENT_EQUIPMENT-
_TYPE
The type of measuring <EQUIPMENT> used to measure <<WIND_DIRECTION>> and/or <<WIND_SPEED>>; wind measurement equipment type.   ENUMERATION   1614
WIND_OMEGA The vertical rate of movement of <AIR> relative to pressure coordinates, where downward is positive; wind omega.   REAL PRESSURE_CHANGE_RATE 1618
WIND_RELATIVE_VORTICITY The vorticity of <WIND> determined with respect to a system of coordinates fixed relative to a <PLANETARY_SURFACE>; wind relative vorticity.   REAL ANGULAR_VELOCITY 1619
WIND_RESPONSE_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fraction of the response to the <<WIND_SPEED>> and/or <<WIND_DIRECTION>> of an <OBJECT>. Zero means no wind response at all and one means maximum response.   REAL PURE_NUMBER 1620
WIND_SPEED The ratio of the distance covered by moving <AIR> to the <<TIME_QUANTITY>> taken to cover it; wind speed.   REAL SPEED 1621
WIND_SPEED_20_PERCENTILE-
_CLIMATOLOGY
The minimum <<WIND_SPEED>> that is greater than 20 percent of the <<WIND_SPEED_CLIMATOLOGY>>s; wind speed 20 percentile climatology.   REAL SPEED 1622
WIND_SPEED_50_PERCENTILE-
_CLIMATOLOGY
The minimum <<WIND_SPEED>> that is greater than 50 percent of the <<WIND_SPEED_CLIMATOLOGY>>s; wind speed 50 percentile climatology.   REAL SPEED 1623
WIND_SPEED_80_PERCENTILE-
_CLIMATOLOGY
The minimum <<WIND_SPEED>> that is greater than 80 percent of the <<WIND_SPEED_CLIMATOLOGY>>s; wind speed 80 percentile climatology.   REAL SPEED 1624
WIND_SPEED_CLIMATOLOGY The mean historical (climatology) <<WIND_SPEED>>.   REAL SPEED 1625
WIND_SPEED_CLIMATOLOGY_STD_DEV The standard deviation of <<WIND_SPEED_CLIMATOLOGY>> measurements.   REAL SPEED 1626
WIND_SPEED_DIRECTION_REPORT-
_COUNT
The number of reports including values for both <<WIND_SPEED>> and <<WIND_DIRECTION>>; wind speed direction report count.   COUNT   1627
WIND_SPEED_EAST The <<WIND_SPEED>> in the geodetic east-west direction, where east is positive.   REAL SPEED 1628
WIND_SPEED_EAST_CLIM_STD_DEV The standard deviation of <<WIND_SPEED_EAST_CLIMATOLOGY>> measurements.   REAL SPEED 1629
WIND_SPEED_EAST_CLIMATOLOGY The mean historical (climatology) <<WIND_SPEED_EAST>>.   REAL SPEED 1630
WIND_SPEED_EAST_ERROR The error introduced by uncertainties in a measurement of a <<WIND_SPEED_EAST>>.   REAL SPEED 1631
WIND_SPEED_NORTH The <<WIND_SPEED>> in the geodetic north-south direction, where north is positive.   REAL SPEED 1632
WIND_SPEED_NORTH_CLIM_STD_DEV The standard deviation of <<WIND_SPEED_NORTH_CLIMATOLOGY>> measurements.   REAL SPEED 1633
WIND_SPEED_NORTH_CLIMATOLOGY The mean historical (climatology) <<WIND_SPEED_NORTH>>.   REAL SPEED 1634
WIND_SPEED_NORTH_ERROR The error introduced by uncertainties in a measurement of a <<WIND_SPEED_NORTH>>.   REAL SPEED 1635
WIND_SPEED_OCTANT_CLIMATOLOGY The historical (climatology) <<WIND_SPEED>> categorized by cardinal vector octant (a 45 arc degree sector centred on a cardinal direction).   REAL SPEED 1636
WIND_SPEED_OCTANT_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fraction of observations reporting <<WIND_SPEED>>s within a cardinal vector octant (a 45 arc degree sector centred on a cardinal <DIRECTION>). Zero means no <<WIND_SPEED>>s are reported within the cardinal vector octant and one means that all <<WIND_SPEED>>s are reported within the cardinal vector octant.   REAL PURE_NUMBER 1637
WIND_SPEED_ONLY_COUNT The number of reports including values for <<WIND_SPEED>> only; wind speed only count.   COUNT   1638
WIND_SPEED_QUALITY The quality of a <<WIND_SPEED>> measurement.   ENUMERATION   1639
WIND_SPEED_U The component of <<WIND_SPEED>> in the X <DIRECTION> of a projected coordinate system, where +X is positive; wind speed U.   REAL SPEED 1640
WIND_SPEED_V The component of <<WIND_SPEED>> in the Y <DIRECTION> of a projected coordinate system, where +Y is positive; wind speed V.   REAL SPEED 1641
WIND_SPEED_W The component of <<WIND_SPEED>> in the Z <DIRECTION> (vertical axis) of the coordinate system of the measurement, where +Z is positive; wind speed W.   REAL SPEED 1642
WIND_VARIABLE_FRACTION-
_CLIMATOLOGY
A number between 0 and 1 inclusive representing the linearly-scaled fraction of historical (climatology) <<WIND_SPEED>>s of 2,575 metres per second (five knots) or greater; wind variable fraction climatology. Zero means no <<WIND_SPEED>>s are of 2,575 metres per second and one means that all <<WIND_SPEED>>s reported are of 2,575 metres per second.   REAL PURE_NUMBER 1643
WIND_VECTOR_SPEED_CLIMATOLOGY The magnitude of the vector defined by the <<WIND_SPEED_EAST_CLIMATOLOGY>> and the <<WIND_SPEED_NORTH_CLIMATOLOGY>>.   REAL SPEED 1644
WIND_WAVE_DIRECTION The <<GEODETIC_AZIMUTH>> of the <DIRECTION> from which <WIND_WAVE>s are arriving.   REAL PLANE_ANGLE 1645
WIND_WAVE_HEIGHT The <<HEIGHT>> measured vertically from the trough to the crest of a <WIND_WAVE>.   REAL LENGTH 1646
WIND_WAVE_PERIOD The mean <<TIME_QUANTITY>> a complete cycle (usually crest to crest or trough to trough) of a <WIND_WAVE> takes to pass a given <LOCATION>; wind wave period.   REAL TIME 1647
WINDOW_MATERIAL_TYPE The type of <MATERIAL> filling the <APERTURE> of a <WINDOW>.   ENUMERATION   1648
WINDOW_TYPE The type of a <WINDOW> based on the manner in which it operates.   ENUMERATION   1712
WINTER_CANOPY_COVER_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fractional canopy cover of <TREE>s during the winter within a delineated <TRACT>. Zero means no cover and one means completely covered.   REAL PURE_NUMBER 1649
WIRE_COUNT The number of <WIRE>s associated with a <STRUCTURE> (for example: a <POWER_TRANSMISSION_LINE> and/or a <POWER_TRANSMISSION_LINE_PYLON>); wire count.   COUNT   1650
WIRE_MESH_COVERED An indication that an <APERTURE> is covered with a mesh of <WIRE>s; wire mesh covered.   BOOLEAN   1651
WIRE_STRAND_COUNT The number of strands comprising a <WIRE_OBSTACLE>; wire strand count.   COUNT   1652
WMO_STATION_IDENTIFIER The WMO identifier number for a <WEATHER_STATION>. The value is formatted in a Basic Latin string as specified by [WMO9A, "Record Layout of the Station Data File", field 5].   CONSTRAINED_STRING   1653
WOODY_VEGETATION_DENSITY A number between 0 and 1 inclusive representing the linearly-scaled fraction of the <LAND> that is covered by woody <VEGETATION> within a delineated <TRACT>; woody vegetation density. Zero means no woody <VEGETATION> is present and one means the <TRACT> is completely covered.   REAL PURE_NUMBER 1654
WORK_IN_PROGRESS_TYPE The type of work in progress.   ENUMERATION   1655
WORSHIP_PLACE_TYPE The type of a <WORSHIP_PLACE>.   ENUMERATION   1656