Table 6.17 — EAs with labels beginning with M
Label Concept definition Figure(s) Attribute value type EQ label Code
MAGNETIC_AZIMUTH The <<VECTOR_AZIMUTH_MAGNETIC>> in the horizontal plane at the observer's <LOCATION> to either a <LINE> passing through the observer, a vector relative to the observer, or the <DIRECTION> from the observer to an <OBJECT> or <LOCATION>.   REAL PLANE_ANGLE 629
MAGNETIC_FIELD_A A 3-hourly equivalent amplitude index of geomagnetic activity at a specific solar electromagnetic flux <OBSERVATION_STATION> on the <EARTH>, related to the 3-hourly <<MAGNETIC_FIELD_K>> index and ranging in value from 0 to 400; magnetic field A.   REAL PURE_NUMBER 630
MAGNETIC_FIELD_A_DAILY A daily index of magnetic activity derived as the mean of eight consecutive 3-hourly <<MAGNETIC_FIELD_A>> values.   REAL PURE_NUMBER 631
MAGNETIC_FIELD_ANOMALY The difference between the <MAGNETIC_FIELD> of a <PLANET> declination of the disturbance <REGION> and the <MAGNETIC_FIELD> declination of the surrounding <REGION>; magnetic field anomaly.   REAL PLANE_ANGLE 632
MAGNETIC_FIELD_AP A daily averaged <<MAGNETIC_FIELD_A>> of a <PLANET> based on data from specific solar electromagnetic flux stations; magnetic field AP.   REAL PURE_NUMBER 633
MAGNETIC_FIELD_DECLINATION-
_ANGLE
The declination angle between magnetic north and geodetic north of the <MAGNETIC_FIELD> of a <PLANET>. The value is determined as a horizontal angle measured east (positive value) or west (negative value) according to whether magnetic north lies east or west of geodetic north.   REAL PLANE_ANGLE 634
MAGNETIC_FIELD_EAST_COMPONENT The strength of the geodetic east vector component of the <MAGNETIC_FIELD> of a <PLANET>.   REAL MAGNETIC_FLUX_DENSITY 635
MAGNETIC_FIELD_FULL_COMPONENT The strength of the full vector component of the <MAGNETIC_FIELD> of a <PLANET>. The value is the vector sum of the <<MAGNETIC_FIELD_EAST_COMPONENT>>, <<MAGNETIC_FIELD_NORTH_COMPONENT>>, and <<MAGNETIC_FIELD_VERTICAL_COMPONENT>>.   REAL MAGNETIC_FLUX_DENSITY 636
MAGNETIC_FIELD_HORIZONTAL-
_COMPONENT
The strength of the horizontal vector component of the <MAGNETIC_FIELD> of a <PLANET>. The value is the vector sum of the <<MAGNETIC_FIELD_EAST_COMPONENT>> and <<MAGNETIC_FIELD_NORTH_COMPONENT>>; magnetic field horizontal component.   REAL MAGNETIC_FLUX_DENSITY 637
MAGNETIC_FIELD_INCLINATION-
_ANGLE
The inclination angle between the <MAGNETIC_FIELD> of a <PLANET> and the local horizontal plane. The angle is positive downwards.   REAL PLANE_ANGLE 638
MAGNETIC_FIELD_K A 3-hourly quasi-logarithmic planetary index of magnetic activity, representing a value measuring the two horizontal (x,y) components of the <MAGNETIC_FIELD> at a specific solar electromagnetic flux <OBSERVATION_STATION> on the <EARTH>; magnetic field K. K = 0 represents a 2,5 nanoTesla variation from the quiet day value, and K = 9 represents a 666 nanoTesla variation.   REAL PURE_NUMBER 639
MAGNETIC_FIELD_K_DAILY A daily index of magnetic activity derived as the mean of eight consecutive 3-hourly <<MAGNETIC_FIELD_K>> values.   REAL PURE_NUMBER 640
MAGNETIC_FIELD_KP A daily averaged planetary <<MAGNETIC_FIELD_K>> based on data from specific solar electromagnetic flux stations; magnetic field KP.   REAL PURE_NUMBER 641
MAGNETIC_FIELD_NORMAL The strength of the <MAGNETIC_FIELD> of a <PLANET> as measured in orbit, in the <DIRECTION> normal to the plane formed by the spin axis of an <ARTIFICIAL_SATELLITE> and the <DIRECTION> of the <PLANET>.   REAL MAGNETIC_FLUX_DENSITY 642
MAGNETIC_FIELD_NORTH_COMPONENT The strength of the geodetic north vector component of the <MAGNETIC_FIELD> of a <PLANET>.   REAL MAGNETIC_FLUX_DENSITY 643
MAGNETIC_FIELD_PARALLEL The strength of the <MAGNETIC_FIELD> of a <PLANET> as measured in orbit, in the <DIRECTION> parallel to the spin axis of an <ARTIFICIAL_SATELLITE>.   REAL MAGNETIC_FLUX_DENSITY 644
MAGNETIC_FIELD_PLANETWARD The strength of the <MAGNETIC_FIELD> of a <PLANET> as measured in orbit, in the <DIRECTION> of the <PLANET>.   REAL MAGNETIC_FLUX_DENSITY 645
MAGNETIC_FIELD_TOTAL The strength of the <MAGNETIC_FIELD> of a <PLANET> as measured in orbit; magnetic field total. The value is determined by the magnitude of the total <MAGNETIC_FIELD> vector.   REAL MAGNETIC_FLUX_DENSITY 646
MAGNETIC_FIELD_VERTICAL-
_COMPONENT
The strength of the vertical vector component of the <MAGNETIC_FIELD> of a <PLANET>.   REAL MAGNETIC_FLUX_DENSITY 647
MAGNETIC_LOCAL_TIME At a given <LOCATION>, the angle subtended at the geomagnetic axis between the geomagnetic midnight meridian and the meridian that passes through the given <LOCATION>, expressed as hours where 15 arc degrees is equivalent to 1 hour; magnetic local time. The geomagnetic meridian containing the sub-solar point defines geomagnetic local noon and the opposite meridian defines geomagnetic midnight.   REAL TIME 648
MAGNETOSPHERE_PLASMA_FLUX The total flux of charged <PARTICLE>s (plasma) in a <MAGNETOSPHERE>.   REAL PARTICLE_FLUX_DENSITY 649
MAILBOX_TYPE The type of a <MAILBOX>.   ENUMERATION   1699
MAINTAINED An indication that an <OBJECT> is maintained.   BOOLEAN   650
MAN_MADE An indication that an <OBJECT> is man-made.   BOOLEAN   651
MANOEUVRE_DAMAGE_FRACTION A number between 0 and 1 inclusive representing the linearly-scaled fraction of the extent of physical injury/damage to an <OBJECT> affecting its capability to manoeuvre. Zero means no damage at all and one means completely immobilized.   REAL PURE_NUMBER 652
MARGINAL_ICE_ZONE_COVER-
_FRACTION
A number between 0 and 1 inclusive representing the marginal ice zone cover as a linearly-scaled fraction of complete cover, where the <BOUNDARY> of the <ICE> is defined as occurring at 0,4.   REAL PURE_NUMBER 653
MARINE_BEACON_SHAPE The characteristic geometric shape of a marine <BEACON>.   ENUMERATION   654
MARINE_BOUNDARY_LIMIT_TYPE The type of limit <BOUNDARY> of a <MARINE_REGION>.   ENUMERATION   655
MARINE_CONSTRUCTION_TYPE The type of construction used for a <MARINE_OBJECT>.   ENUMERATION   656
MARINE_LIGHT_SECTOR_INITIAL-
_ANGLE
The initial limit of visibility of a <MARINE_LIGHT_SECTOR> expressed as a <<BEARING_FROM_SEAWARD>>; marine light sector initial angle. Limits of sectors and arcs of visibility are arranged clockwise with respect to the <LIGHT>.   REAL PLANE_ANGLE 657
MARINE_LIGHT_SECTOR_TERMINAL-
_ANGLE
The terminal limit of visibility of a <MARINE_LIGHT_SECTOR> expressed as a <<BEARING_FROM_SEAWARD>>; marine light sector terminal angle. Limits of sectors and arcs of visibility are arranged clockwise with respect to the <LIGHT>.   REAL PLANE_ANGLE 658
MARINE_LIGHT_TYPE The type of <LIGHT> used for marine navigation.   ENUMERATION   659
MARINE_LINE_ASSOCIATED_ATNAV The type and/or number of <AID_TO_NAVIGATION>s associated with a <MARINE_LEADING_LINE> or <MARINE_CLEARING_LINE>.   ENUMERATION   660
MARINE_LINE_ATNAV_DESCRIPTION A description of the <AID_TO_NAVIGATION>s that form a marine navigation <LINE>.
EXAMPLE     Description of a <MARINE_LEADING_LINE>.
  STRING   661
MARINE_MARK_TYPE The type of a <MARINE_AID_TO_NAVIGATION> (for example: a <BEACON> and/or a <BUOY>). This type is evidenced using a mark, sign, or signal indicating the purpose of that <MARINE_AID_TO_NAVIGATION>.   ENUMERATION   683
MARINE_NAVIGATION_LINE_TYPE The type of a marine navigation <LINE>.   ENUMERATION   662
MARINE_PILOT_BOARDING_METHOD The pilot boarding method for <VESSEL>s using marine pilot services.   ENUMERATION   664
MARINE_PILOT_BOARDING_VEHICLE The <VEHICLE> by which marine pilots are transferred to and from <VESSEL>s using pilot services; marine pilot boarding vehicle.   ENUMERATION   665
MARINE_PILOT_DISTRICT The pilot district for which a marine pilot is responsible.   STRING   666
MARINE_PORT_IDENTIFIER The textual identifier of a <MARINE_PORT>.   STRING   667
MARINE_REGION_TYPE The type of a <MARINE_REGION>, describing some aspect of significance to marine operations.   ENUMERATION   668
MARINE_RESCUE_STATION_TYPE The type of a marine rescue <PUBLIC_SERVICE_STATION>.   ENUMERATION   669
MARINE_STATION_ACTIVITY The type of activity conducted at a marine station.   ENUMERATION   671
MARINE_STATION_EQUIPMENT The type of <EQUIPMENT> at a marine station.   ENUMERATION   672
MARINE_SURVEY_TYPE The type of a marine survey.   ENUMERATION   673
MARINE_TONNAGE The tonnage of a <MARINE_WRECK>, a <HULK>, or other <VESSEL>.   REAL MASS 674
MARINE_TRACK_TYPE The type of restrictions, <DIRECTION>, and other characteristics of marine tracks.   ENUMERATION   675
MARINE_TRAFFIC_SIGNAL_TYPE The type of a marine traffic signal.   ENUMERATION   676
MARINE_USE The type of a <MARINE_OBJECT>; marine use.   ENUMERATION   678
MARINE_WARNING_SIGNAL_TYPE The type of a marine warning signal station.   ENUMERATION   679
MARINE_WRECK_STATUS The status of a <MARINE_WRECK>.   ENUMERATION   680
MARINE_WRECK_TYPE The type of a <MARINE_WRECK>.   ENUMERATION   681
MARINER_NOTICE_DATE The publication date of a Notice To Mariners. The date is formatted as specified by <<DATE_FORMAT>> or by <<DATE_TIME_FORMAT>>.   CONSTRAINED_STRING   682
MASS The mass of an <OBJECT>.   REAL MASS 684
MASS_EXTINCTION_COEFFICIENT The ratio of the extinction coefficient to the <<MATERIAL_DENSITY>> of the transmission medium and can also be expressed by the natural logarithm of <<TRANSMISSIVITY>> divided by <<LENGTH>> of propagation and again by <<MATERIAL_DENSITY>>; mass extinction coefficient.   REAL MASS_ATTENUATION_COEFF 685
MAST_TYPE The type of <EQUIPMENT> a <MAST> is intended to support.   ENUMERATION   686
MATERIAL_DENSITY The <<MASS>> per unit <<VOLUME>> of a <MATERIAL>; material density.   REAL VOLUMIC_MASS 687
MATERIAL_HANDLING_FACILITIES The facilities available at a <LOCATION> or in the near vicinity for the handling of <MATERIAL>s.   ENUMERATION   688
MAX_WATERBODY_TEMP_1_STD_DEV The <<WATERBODY_TEMPERATURE>> that is one standard deviation above a <<MEAN_WATERBODY_TEMPERATURE>>; maximum waterbody temperature 1 standard deviation.   REAL THERMO_TEMPERATURE 689
MAX_WATERBODY_TEMP_2_STD_DEV The <<WATERBODY_TEMPERATURE>> that is two standard deviations above a <<MEAN_WATERBODY_TEMPERATURE>>; maximum waterbody temperature 2 standard deviation.   REAL THERMO_TEMPERATURE 690
MAX_WATERBODY_TEMP_3_STD_DEV The <<WATERBODY_TEMPERATURE>> that is three standard deviations above a <<MEAN_WATERBODY_TEMPERATURE>>; maximum waterbody temperature 3 standard deviation.   REAL THERMO_TEMPERATURE 691
MAXIMUM_ACHIEVABLE_TEMPERATURE The maximum <<TEMPERATURE>> that a particular <MATERIAL> or <OBJECT> can achieve.   REAL THERMO_TEMPERATURE 692
MAXIMUM_AIR_TEMPERATURE The maximum <<AIR_TEMPERATURE>> that occurred at a given <LOCATION> during a specific <<TIME_PERIOD>>.   REAL THERMO_TEMPERATURE 693
MAXIMUM_AIR_TEMPERATURE_PERIOD The <<TIME_QUANTITY>> for which a <<MAXIMUM_AIR_TEMPERATURE>> was recorded; maximum air temperature period.   REAL TIME 694
MAXIMUM_AUTHORIZED_ALTITUDE The highest altitude in an <AIR_TRANSPORTATION_ROUTE> at which adequate reception of <AID_TO_NAVIGATION> signals is assured; maximum authorized altitude.   REAL LENGTH 695
MAXIMUM_BREAKER_HEIGHT The <<MAXIMUM_WAVE_HEIGHT>> in a <SURF_ZONE>; maximum breaker height.   REAL LENGTH 696
MAXIMUM_CONTOUR_DEPTH The maximum <<DEPTH>> within a <WATERBODY_FLOOR_REGION> defined by a <DEPTH_CONTOUR_LINE>.   REAL LENGTH 697
MAXIMUM_CURRENT_SPEED The maximum <<WATER_CURRENT_SPEED>>.   REAL SPEED 698
MAXIMUM_DEW_POINT_TEMPERATURE The maximum <<DEW_POINT_TEMPERATURE>> from a series of samples.   REAL THERMO_TEMPERATURE 699
MAXIMUM_FLIGHT_LEVEL The highest <FLIGHT_LEVEL> assigned by air traffic control; maximum flight level. The values are expressed as flight level values by first dividing by 30,48 metres (100 feet) and then rounding to nearest 304,8 metres (1 000 feet) in accordance with the structure of the ICAO Standard Atmosphere.
EXAMPLE     The value for the 500 hectopascals level is 180,0, corresponding to the ICAO standard height 5 574 metres (18 289 feet).
  REAL LENGTH 700
MAXIMUM_ICE_KEEL_DRAFT The maximum <<DEPTH>> (draft) of <ICE_KEEL>s.   REAL LENGTH 701
MAXIMUM_OBSTACLE_HEIGHT The maximum height (or depth) of <TERRAIN_OBSTACLE>s.   REAL LENGTH 702
MAXIMUM_OMNIDIR_SHIPPING-
_NOISE_SPECTRAL_POWER_LEVEL
The maximum of a <SET> of <<OMNIDIR_SHIP_NOISE_SPCT_PWR_LVL>> measurements.   REAL PRESSURE_POWER_LEVEL 703
MAXIMUM_RADIANT_INTENSITY The intensity of electromagnetic radiation per unit solid angle in the <DIRECTION> for which the value is maximal; maximum radiant intensity.   REAL RADIANT_INTENSITY 704
MAXIMUM_STANDING_WATER_DEPTH The maximum depth of non-flowing/standing <WATER>.   REAL LENGTH 705
MAXIMUM_TERRAIN_ELEVATION The maximum <<TERRAIN_ELEVATION>>.   REAL LENGTH 706
MAXIMUM_VERTICAL_CLEARANCE The greatest distance between a <LAND_TRANSPORTATION_ROUTE> and any obstruction vertically above it; maximum vertical clearance.   REAL LENGTH 707
MAXIMUM_VISIBILITY_RANGE The maximum range of visibility into an <OBJECT> (for example: a forest).   REAL LENGTH 708
MAXIMUM_VOLTAGE The maximum voltage available on an <ELECTRICAL_CABLE>.   REAL ELECTRIC_POTENTIAL 709
MAXIMUM_WATER_DEPTH The maximum <<WATER_DEPTH>>.   REAL LENGTH 710
MAXIMUM_WAVE_HEIGHT The mean <<HEIGHT>> of the highest tenth of <WATER_WAVE>s on a <WATERBODY_SURFACE>, measured from trough to crest.   REAL LENGTH 711
MAXIMUM_WIND_GUST_SPREAD The maximum <<WIND_GUST_SPREAD>>.   REAL SPEED 712
MAXIMUM_WIND_SPEED The maximum or peak <<WIND_SPEED>> including gusts.   REAL SPEED 713
MEAN_AIR_DENSITY_CLIM The mean historical (climatology) <<AIR_DENSITY>>.   REAL VOLUMIC_MASS 714
MEAN_AIR_DENSITY_CLIM_STD_DEV The standard deviation of <<MEAN_AIR_DENSITY_CLIM>> measurements.   REAL VOLUMIC_MASS 715
MEAN_AIR_TEMP The mean <<AIR_TEMPERATURE>>.   REAL THERMO_TEMPERATURE 716
MEAN_AIR_TEMP_CLIM The mean historical (climatology) <<AIR_TEMPERATURE>>.   REAL THERMO_TEMPERATURE 717
MEAN_AIR_TEMP_CLIM_STD_DEV The standard deviation of <<MEAN_AIR_TEMP_CLIM>> measurements.   REAL THERMO_TEMPERATURE 718
MEAN_AIR_TEMP_DIFFERENCE_CLIM The historical (climatology) quantity of mean difference between the mean <<AIR_TEMPERATURE>> at an initial time and the mean <<AIR_TEMPERATURE>> at an offset from that time.   REAL THERMO_TEMPERATURE 719
MEAN_AIR_TEMP_MAX_DIFFERENCE-
_CLIM
The historical (climatology) quantity of maximum difference between the mean <<AIR_TEMPERATURE>> at an initial time and the mean <<AIR_TEMPERATURE>> at an offset from that time.   REAL THERMO_TEMPERATURE 720
MEAN_AIR_TEMP_MIN_DIFFERENCE-
_CLIM
The historical (climatology) quantity of minimum difference between the mean <<AIR_TEMPERATURE>> at an initial time and the mean <<AIR_TEMPERATURE>> at an offset from that time.   REAL THERMO_TEMPERATURE 721
MEAN_AIR_WATER_TEMP_DIFF-
_CLIM_STD_DEV
The standard deviation of <<MEAN_AIR_WATER_TEMP_DIFFERENCE>> measurements; mean air water temperature difference climatology standard deviation.   REAL THERMO_TEMPERATURE 722
MEAN_AIR_WATER_TEMP_DIFFERENCE The mean difference between an <<AIR_TEMPERATURE>> and an adjacent <<WATERBODY_SURFACE_TEMPERATURE>>.   REAL THERMO_TEMPERATURE 723
MEAN_CLOUD_DROP_DIAMETER The mean <<OUTSIDE_DIAMETER>> of the drops of <WATER> in a <CLOUD>.   REAL LENGTH 724
MEAN_DEW_POINT_CLIMATOLOGY The mean of the historical (climatology) measured <<DEW_POINT_TEMPERATURE>>s.   REAL THERMO_TEMPERATURE 725
MEAN_DEW_POINT_CLIMATOLOGY-
_STD_DEV
The standard deviation of <<MEAN_DEW_POINT_CLIMATOLOGY>> measurements.   REAL THERMO_TEMPERATURE 726
MEAN_DEW_POINT_TEMPERATURE The mean <<DEW_POINT_TEMPERATURE>>.   REAL THERMO_TEMPERATURE 727
MEAN_EVAP_TRANSPIRATION_RATE The mean rate of loss as a function of time of <WATER> from an <OBJECT> due to evaporation and transpiration.   REAL VOLUME_FLOW_RATE 728
MEAN_GEOPOTENTIAL_ALT_CLIM The mean historical (climatology) <<GEOPOTENTIAL_ALTITUDE>> of <LOCATION>s in the <ATMOSPHERE>.   REAL GEOPOTENTIAL_ENERGY_LENGTH 729
MEAN_GEOPOTENTIAL_ALT_CLIM-
_STD_DEV
The standard deviation of <<MEAN_GEOPOTENTIAL_ALT_CLIM>> measurements.   REAL GEOPOTENTIAL_ENERGY_LENGTH 730
MEAN_ICE_DRAFT The mean <<DEPTH>> (draft) of <ICE> on a <WATERBODY_SURFACE>.   REAL LENGTH 731
MEAN_ICE_DRAFT_STD_DEV The standard deviation of <<MEAN_ICE_DRAFT>> measurements.   REAL LENGTH 732
MEAN_ICE_KEEL_DRAFT The mean <<DEPTH>> (draft) of <ICE_KEEL>s.   REAL LENGTH 733
MEAN_ICE_KEEL_DRAFT_STD_DEV The standard deviation of <<MEAN_ICE_KEEL_DRAFT>> measurements.   REAL LENGTH 734
MEAN_ICE_KEEL_SEPARATION The mean separation distance between <ICE_KEEL>s measured between the peaks of the <ICE_KEEL>s.   REAL LENGTH 735
MEAN_ICE_KEEL_SEPARATION_STD-
_DEV
The standard deviation of <<MEAN_ICE_KEEL_SEPARATION>> measurements.   REAL LENGTH 736
MEAN_LUMINOUS_INTENSITY The mean luminous intensity of a <LIGHT> within its <<LIGHT_BEAM_SPREAD>>.   REAL LUMINANCE_INTENSITY 737
MEAN_MAGNETIC_FIELD-
_DECLINATION_ANGLE
The mean declination angle between magnetic north and geodetic north of the <MAGNETIC_FIELD> of a <PLANET>, typically averaged over one hour.   REAL PLANE_ANGLE 738
MEAN_MAGNETIC_FIELD_EAST-
_COMPONENT
The mean <<MAGNETIC_FIELD_EAST_COMPONENT>> measured as a horizontal angle east (positive value) or west (negative value) according to whether magnetic north lies east or west of geodetic north, typically averaged over one hour.   REAL MAGNETIC_FLUX_DENSITY 739
MEAN_MAGNETIC_FIELD_FULL-
_COMPONENT
The mean strength of the full vector component of the <MAGNETIC_FIELD> of a <PLANET> (vector sum of all components), typically averaged over one hour.   REAL MAGNETIC_FLUX_DENSITY 740
MEAN_MAGNETIC_FIELD-
_HORIZONTAL_COMPONENT
The mean <<MAGNETIC_FIELD_HORIZONTAL_COMPONENT>> (vector sum of <<MAGNETIC_FIELD_EAST_COMPONENT>> and <<MAGNETIC_FIELD_NORTH_COMPONENT>>), typically averaged over one hour.   REAL MAGNETIC_FLUX_DENSITY 741
MEAN_MAGNETIC_FIELD-
_INCLINATION_ANGLE
The mean <<MAGNETIC_FIELD_INCLINATION_ANGLE>>, typically averaged over one hour.   REAL PLANE_ANGLE 742
MEAN_MAGNETIC_FIELD_NORTH-
_COMPONENT
The mean <<MAGNETIC_FIELD_NORTH_COMPONENT>>, typically averaged over one hour.   REAL MAGNETIC_FLUX_DENSITY 743
MEAN_MAGNETIC_FIELD_VERTICAL-
_COMPONENT
The mean <<MAGNETIC_FIELD_VERTICAL_COMPONENT>>, typically averaged over one hour.   REAL MAGNETIC_FLUX_DENSITY 744
MEAN_OBJECT_DIAMETER The mean diameter of individual <OBJECT>s within a delineated <REGION>.   REAL LENGTH 745
MEAN_OBJECT_SPACING The mean distance between the centroids of adjacent <OBJECT>s within a delineated <REGION>; mean object spacing.   REAL LENGTH 746
MEAN_POTENTIAL_SOIL_EVAP-
_TRANSPIRATION_RATE
The mean rate of potential loss of <WATER> from the <SOIL> due to evaporation and transpiration.   REAL VOLUME_FLOW_RATE 747
MEAN_PRIMARY_BREAKER_PERIOD The mean <<TIME_QUANTITY>> required for two successive primary breaking <WATER_WAVE> crests in a wave spectra to pass a fixed point; mean primary breaker period.   REAL TIME 748
MEAN_PRIMARY_WAVE_PERIOD The mean <<TIME_QUANTITY>> required for two successive primary <WATER_WAVE> crests (combined <WIND_WAVE> and <SWELL_WAVE>) in a wave spectra to pass a fixed point; mean primary wave period.   REAL TIME 749
MEAN_SECONDARY_BREAKER_PERIOD The mean <<TIME_QUANTITY>> required for two successive secondary breaking <WATER_WAVE> crests in a wave spectra to pass a fixed point; mean secondary breaker period.   REAL TIME 750
MEAN_SECONDARY_WAVE_PERIOD The mean <<TIME_QUANTITY>> required for two successive secondary <WATER_WAVE> crests in a wave spectrum to pass a fixed point; mean secondary wave period.   REAL TIME 751
MEAN_SOIL_EVAP_TRANSPIRATION-
_RATE
The mean <<MEAN_EVAP_TRANSPIRATION_RATE >> of the <SOIL> of a <TERRAIN_SURFACE_REGION>.   REAL VOLUME_FLOW_RATE 752
MEAN_SOLAR_LONGWAVE_RADIATION The mean rate of change as a function of time of long wave (4 to 80 micrometres) solar radiation incident on a <SURFACE>.   REAL IRRADIANCE 753
MEAN_SSNL_HIGH_WATER_DEPTH The mean seasonal high <<WATER_DEPTH>> in an <INLAND_WATER> exclusive of high water due to runoff.   REAL LENGTH 754
MEAN_SSNL_HIGH_WATER_SPEED The mean seasonal high <<WATER_CURRENT_SPEED>>, estimated within the delineation of an <INLAND_WATER>, exclusive of high water due to runoff.   REAL SPEED 755
MEAN_SSNL_LOW_WATER_DEPTH The mean seasonal low <<WATER_DEPTH>> in an <INLAND_WATER> exclusive of low water due to drought.   REAL LENGTH 756
MEAN_SSNL_LOW_WATER_SPEED The mean seasonal low <<WATER_CURRENT_SPEED>> in an <INLAND_WATER> exclusive of low water due to drought.   REAL SPEED 757
MEAN_STEM_DIAMETER The mean <<STEM_DIAMETER>> of <VEGETATION> measured at a <<HEIGHT_AGL>> of 1,4 metres.   REAL LENGTH 758
MEAN_STEM_SPACING The mean stem spacing of <VEGETATION> measured at a <<HEIGHT_AGL>> of 1,4 metres.   REAL LENGTH 759
MEAN_SWELL_WAVE_DIRECTION The mean <<GEODETIC_AZIMUTH>> of the <DIRECTION> from which <SWELL_WAVE>s are arriving.   REAL PLANE_ANGLE 760
MEAN_SWELL_WAVE_HEIGHT The mean <<HEIGHT>> of <SWELL_WAVE>s measured from trough to crest.   REAL LENGTH 761
MEAN_SWELL_WAVE_PERIOD The mean <<TIME_QUANTITY>> required for the crests of two successive <SWELL_WAVE>s to pass a fixed point; mean swell wave period.   REAL TIME 762
MEAN_TERRAIN_ELEVATION The mean of <<TERRAIN_ELEVATION>>s.   REAL LENGTH 763
MEAN_TERRAIN_ELEVATION_STD_DEV The standard deviation of <<MEAN_TERRAIN_ELEVATION>>s.   REAL LENGTH 764
MEAN_TIDAL_WATER_DEPTH The mean <<DEPTH>> from a tidal <SURFACE_DATUM> to the <WATERBODY_FLOOR>; mean tidal water depth.   REAL LENGTH 765
MEAN_WATER_DEPTH The mean of <<WATER_DEPTH>> measurements.   REAL LENGTH 768
MEAN_WATER_SPEED The mean <<WATER_CURRENT_SPEED>>, estimated within the delineation of a <WATERBODY>, exclusive of high <WATER_CURRENT>s due to runoff or low <WATER_CURRENT>s due to drought.   REAL SPEED 769
MEAN_WATER_WAVELENGTH The mean distance between the crests of two successive <WATER_WAVE>s (combined <WIND_WAVE>s and <SWELL_WAVE>s); mean water wavelength.   REAL LENGTH 773
MEAN_WATERBODY_TEMP_STD_DEV The standard deviation of <<MEAN_WATERBODY_TEMPERATURE>>s.   REAL THERMO_TEMPERATURE 766
MEAN_WATERBODY_TEMPERATURE The mean of <<WATERBODY_TEMPERATURE>> measurements.   REAL THERMO_TEMPERATURE 767
MEAN_WAVE_DIRECTION The mean <<GEODETIC_AZIMUTH>> of the <DIRECTION> from which significant <WATER_WAVE>s (combined <WIND_WAVE>s and <SWELL_WAVE>s) in the wave spectra are arriving.   REAL PLANE_ANGLE 770
MEAN_WAVE_HEIGHT The mean apparent <<HEIGHT>> of <WATER_WAVE>s (combined <WIND_WAVE>s and <SWELL_WAVE>s) measured from trough to crest.   REAL LENGTH 771
MEAN_WAVE_HEIGHT_STD_DEV The standard deviation of <<MEAN_WAVE_HEIGHT>> measurements.   REAL LENGTH 772
MEAN_WAVE_PERIOD The mean <<TIME_QUANTITY>> required for two successive <WATER_WAVE>s (<WIND_WAVE> and <SWELL_WAVE>) in a wave spectra to pass a fixed point; mean wave period.   REAL TIME 774
MEAN_WIND_SPEED The mean <<WIND_SPEED>>.   REAL SPEED 775
MEAN_WIND_SPEED_STD_DEV The standard deviation of <<MEAN_WIND_SPEED>> measurements.   REAL SPEED 776
MEAN_WIND_WAVE_HEIGHT The mean <<WIND_WAVE_HEIGHT>>.   REAL LENGTH 777
MEAN_WIND_WAVE_PERIOD The mean <<TIME_QUANTITY>> required for the crests of two successive <WIND_WAVE>s to pass a fixed point; mean wind wave period.   REAL TIME 778
MEASUREMENT_DEPTH The depth below a <SURFACE> at which a measurement was taken.   REAL LENGTH 779
MEASUREMENT_HEIGHT The <<HEIGHT>> above a <SURFACE> at which a measurement was taken.   REAL LENGTH 780
MERCHANT_MARINE_VESSEL_TYPE The type of a <MERCHANT_MARINE_VESSEL>.   ENUMERATION   781
MERCHANT_VESSEL_DENSITY The areal density of merchant <WATER_SURFACE_VESSEL>s (gross weight greater than 907 000 kilograms (approximately 1 000 tons) and <<LENGTH>> greater than 18 metres) in a <WATERBODY_SURFACE_REGION>.   REAL AREAL_ENTITY_DENSITY 782
MET_TRANSMISSIVITY_DISTANCE The measured distance of a meteorological transmissivity observation.   REAL LENGTH 783
MET_TRANSMISSIVITY_WAVELENGTH The electromagnetic <<WAVELENGTH>> used for a meteorological transmissivity distance observation.   REAL LENGTH 784
METEOROLOGICAL_RANGE The distance at which an ideal observer can detect a high-contrast target assuming a detection contrast threshold of 0,02 and a target inherent contrast of 1,0; meteorological range.   REAL LENGTH 785
METERED_PARKING An indication that parking spaces in the designated <TRACT> have <PARKING_METER>s; metered parking.   BOOLEAN   1700
MIDDLE_CLOUD_BASE_LEVEL The <<CLOUD_BASE_LEVEL>> of a <MIDDLE_CLOUD>.   REAL LENGTH 786
MIDDLE_CLOUD_COVERAGE A number between 0 and 1 inclusive representing the linearly-scaled fraction of the sky covered by <MIDDLE_CLOUD>s; middle cloud coverage. Zero means no <MIDDLE_CLOUD>s and one means completely covered.   REAL PURE_NUMBER 787
MIDDLE_CLOUD_GENUS The genus of a <MIDDLE_CLOUD>.   ENUMERATION   788
MIDDLE_CLOUD_TOP_LEVEL The <<CLOUD_TOP_LEVEL>> of a <MIDDLE_CLOUD>.   REAL LENGTH 789
MIDDLE_CLOUD_TYPE_OBSERVED The type of observed <MIDDLE_CLOUD>s.   ENUMERATION   790
MILITARY_ASSET_TYPE The type of a military asset.
EXAMPLES     <VEHICLE>, <EQUIPMENT>, <PERSONNEL>.
  ENUMERATION   791
MILITARY_BRIDGE_INFORMATION Information identifying and/or describing a <BRIDGE>, typically one that is subject to preplanned military interdiction.   STRING   792
MILITARY_FORCE_ALLEGIANCE The military allegiance of the force responsible for the creation or maintenance of a <MAN_MADE_OBJECT>. The value is specified in the following manner:
(1) All allegiances are from the perspective of the nation or force providing the classification. The "nation or force providing the classification" is not defined in this International Standard and must be determined from the context in which this EA is used.
(2) In a conflict that involves more than two mutual combatants, nine additional enumerants are defined for identification of the combatants. The number nine was chosen because, historically, more than nine groups are unlikely to simultaneously engage in mutual hostilities.
(3) The groups identified by each of the nine additional enumerants are not defined in this International Standard and must be determined by the context in which this EA is used.
  ENUMERATION   793
MILITARY_USE The type of use of a military <REGION>.   ENUMERATION   794
MIN_WATERBODY_TEMP_1_STD_DEV The <<WATERBODY_TEMPERATURE>> that is one standard deviation below a <<MEAN_WATERBODY_TEMPERATURE>>; minimum waterbody temperature 1 standard deviation.   REAL THERMO_TEMPERATURE 795
MIN_WATERBODY_TEMP_2_STD_DEV The <<WATERBODY_TEMPERATURE>> that is two standard deviations below a <<MEAN_WATERBODY_TEMPERATURE>>; minimum waterbody temperature 2 standard deviation.   REAL THERMO_TEMPERATURE 796
MIN_WATERBODY_TEMP_3_STD_DEV The <<WATERBODY_TEMPERATURE>> that is three standard deviations below a <<MEAN_WATERBODY_TEMPERATURE>>; minimum waterbody temperature 3 standard deviation.   REAL THERMO_TEMPERATURE 797
MINE_ACOUSTIC_ACTUATION The type of acoustic actuation of an <EXPLOSIVE_MINE>.   ENUMERATION   798
MINE_ACTUATION The type of actuation of an <EXPLOSIVE_MINE>.   ENUMERATION   799
MINE_ALLEGIANCE The <<MILITARY_FORCE_ALLEGIANCE>> of the force responsible for the creation or maintenance of an <EXPLOSIVE_MINE>.   ENUMERATION   800
MINE_ANTI_HUNTING_TYPE The type of anti-hunting capability of an <EXPLOSIVE_NAVAL_MINE>.   ENUMERATION   801
MINE_ANTI_RECOVERY_TYPE The type of anti-recovery capability of an <EXPLOSIVE_MINE>.   ENUMERATION   802
MINE_ANTI_SWEEP_WIRE_TYPE The type of anti-sweep <WIRE> capability of an <EXPLOSIVE_NAVAL_MINE>.   ENUMERATION   803
MINE_CABLELESS_ACTUATION The type of cableless control method of an <EXPLOSIVE_NAVAL_MINE>; mine cableless actuation.   ENUMERATION   804
MINE_CAPABILITY_TYPE The type of capability of an <EXPLOSIVE_MINE>.   ENUMERATION   805
MINE_CHARGE_SIZE The <<MASS>> of an <EXPLOSIVE_MINE> charge; mine charge size.   REAL MASS 806
MINE_CONTACT_ACTUATION The type of independent contact actuation of an <EXPLOSIVE_MINE>.   ENUMERATION   807
MINE_CONTROL_METHOD The type of actuation control method of an <EXPLOSIVE_MINE>.   ENUMERATION   808
MINE_COUNT The number of <EXPLOSIVE_MINE>s within a <MINEFIELD>; mine count.   COUNT   809
MINE_COUNTERMEASURE_VESSEL-
_TYPE
The type of a <WATER_SURFACE_VESSEL> designed for countermeasure or laying operations for <EXPLOSIVE_NAVAL_MINE>s.   ENUMERATION   810
MINE_INDEPENDENT_ACTUATION The type of independent actuation of an <EXPLOSIVE_MINE>.   ENUMERATION   811
MINE_INFLUENCE_ACTUATION The type of actuation influences of an <EXPLOSIVE_MINE>.   ENUMERATION   812
MINE_INFORMATION_TYPE The special information characteristic type of an <EXPLOSIVE_MINE>.   ENUMERATION   813
MINE_MAGNETIC_SENSITIVITY The sensitivity of a magnetic activation <EXPLOSIVE_MINE>.   ENUMERATION   814
MINE_MOORED_POSITION_TYPE The position type of a moored <EXPLOSIVE_NAVAL_MINE>.   ENUMERATION   815
MINE_OPERATIONAL_USE The military operational use of an <EXPLOSIVE_MINE>.   ENUMERATION   816
MINE_OTHER_ACTUATION_TYPE The type of actuation, independent of other actuation methods, of an <EXPLOSIVE_MINE>.   ENUMERATION   817
MINE_OTHER_INFORMATION_TYPE The subsidiary information for an <EXPLOSIVE_MINE>; mine other information type.   ENUMERATION   818
MINE_POSITION_TYPE The type of position of an <EXPLOSIVE_MINE>.   ENUMERATION   819
MINE_SPECIAL_CAPABILITY_TYPE The type of special capabilities of an <EXPLOSIVE_MINE>.   ENUMERATION   820
MINE_STATUS The status of an <EXPLOSIVE_MINE>.   ENUMERATION   821
MINE_SWEPT An indication that a <WATERBODY_REGION> has been swept for <EXPLOSIVE_MINE>s.   BOOLEAN   822
MINE_TACTICAL_USE The military tactical use of an <EXPLOSIVE_MINE>.   ENUMERATION   823
MINE_TRACK_IDENTIFIER The numeric identifier of the track of an <EXPLOSIVE_NAVAL_MINE>.   INDEX   824
MINEFIELD_DELIVERY_METHOD The delivery method by which a <MINEFIELD> is created.   ENUMERATION   825
MINEFIELD_TYPE The type of a <MINEFIELD> based on its functional purpose.   ENUMERATION   826
MINIMUM_AIR_TEMPERATURE The lowest <<AIR_TEMPERATURE>> attained during a <<TIME_QUANTITY>>; minimum air temperature.   REAL THERMO_TEMPERATURE 827
MINIMUM_AIR_TEMPERATURE_PERIOD The <<TIME_QUANTITY>> for which a <<MINIMUM_AIR_TEMPERATURE>> was recorded; minimum air temperature period.   REAL TIME 828
MINIMUM_CONTOUR_DEPTH The minimum depth within a <WATERBODY_FLOOR_REGION> defined by a <DEPTH_CONTOUR_LINE>.   REAL LENGTH 829
MINIMUM_CURRENT_SPEED The minimum <<WATER_CURRENT_SPEED>>.   REAL SPEED 830
MINIMUM_DEW_POINT_TEMPERATURE The minimum <<DEW_POINT_TEMPERATURE>> from a series of samples.   REAL THERMO_TEMPERATURE 831
MINIMUM_ENROUTE_ALTITUDE The lowest altitude between radio fixes that assures acceptable navigational signal coverage and meets obstacle clearance requirements; minimum enroute altitude.   REAL LENGTH 832
MINIMUM_FLIGHT_LEVEL The lowest <FLIGHT_LEVEL> assigned by air traffic control; minimum flight level. The values are expressed as flight level values by first dividing by 30,48 metres (100 feet) and then rounding to nearest 304,8 metres (1 000 feet) in accordance with the structure of the ICAO Standard Atmosphere.
EXAMPLE     The value for the 500 hectopascals level is 180,0, corresponding to the ICAO standard height 5 574 metres (18 289 feet).
  REAL LENGTH 833
MINIMUM_ICE_KEEL_DRAFT The minimum draft (depth) of <ICE_KEEL>s.   REAL LENGTH 834
MINIMUM_OMNIDIR_SHIPPING-
_NOISE_SPECTRAL_POWER_LEVEL
The minimum of <<OMNIDIR_SHIP_NOISE_SPCT_PWR_LVL>> measurements.   REAL PRESSURE_POWER_LEVEL 835
MINIMUM_SAFE_ALTITUDE The minimum safe <<ALTITUDE_MSL>> that provides a 304,8 metre (1 000 foot) obstacle clearance within an <AIRSPACE>.   REAL LENGTH 836
MINIMUM_TERRAIN_ELEVATION The minimum of <<TERRAIN_ELEVATION>>s.   REAL LENGTH 837
MINUTE_WITHIN_DAY The ordinal index of a minute within the day, starting with the number "0" at midnight.   COUNT   838
MINUTE_WITHIN_HOUR The ordinal index of a minute within the hour. The index starts with the number "0" at the beginning of the hour.   COUNT   839
MISSILE_SITE_TYPE The type of a <MISSILE_SITE>.   ENUMERATION   840
MISSING_INFORMATION_TYPE The type of missing information.   ENUMERATION   841
MISSION_SPECIFIC_DAMAGE-
_FRACTION
A number between 0 and 1 inclusive representing the linearly-scaled fraction of the extent of physical injury/damage to an <OBJECT> (for example: a critical sensor/emitter <AERIAL> and/or subsystem) specific to the mission. Zero means no damage at all and one means maximum damage.   REAL PURE_NUMBER 842
MIXING_LAYER_DEPTH The depth of the bottom of a surface mixing layer measured from a <WATERBODY_SURFACE>.   REAL LENGTH 843
MIXING_LAYER_DEPTH_STD_DEV The standard deviation of <<MIXING_LAYER_DEPTH>> measurements.   REAL LENGTH 844
MIXING_LAYER_TEMP_GRAD The gradient of <<TEMPERATURE>> across a surface mixing layer.   REAL LINEIC_THERMO_TEMP_GRADIENT 845
MIXING_LAYER_TEMP_GRAD_STD_DEV The standard deviation of <<MIXING_LAYER_TEMP_GRAD>> measurements.   REAL LINEIC_THERMO_TEMP_GRADIENT 846
MIXING_RATIO In a <SYSTEM> of moist <AIR>, the ratio of the <<MASS>> of water vapour to the <<MASS>> of dry <AIR>; mixing ratio.   REAL MASS_FRACTION 847
MIXING_RATIO_ATM_LIQUID_WATER The ratio of the <<MASS>> of liquid <WATER> to the <<MASS>> of dry <AIR> in a unit <<VOLUME>> of <AIR>; mixing ratio atmosphere liquid water.   REAL VOLUMIC_MASS 115
MIXING_RATIO_CLOUD_WATER The ratio of the <<MASS>> of the liquid <WATER> to the <<MASS>> of dry <AIR> in a <CLOUD>; mixing ratio cloud water.   REAL MASS_FRACTION 238
MODIFIED_SURF_INDEX A dimensionless number that provides a relative measure of the severity of the conditions likely to be encountered in the <SURF_ZONE>; modified surf index.   REAL PURE_NUMBER 848
MODULUS_OF_ELASTICITY The ratio of normal stress ISO 80000-4:2006, item 4-15.2 to linear strain ISO 80000-4:2006, item 4-16.1 for a <MATERIAL>; modulus of elasticity. It is also known as Young's modulus.   REAL PURE_NUMBER 849
MONITORED An indication that an <OBJECT> is actively monitored.   BOOLEAN   850
MONTH The month of the year in the Gregorian calendar.   ENUMERATION   851
MOON_PHASE The phase of the <MOON>.   ENUMERATION   852
MOON_PHASE_COUNT The number of complete phases of the <MOON> since 00:00:00 UTC, 1 January 1970; moon phase count.   COUNT   853
MOON_PHASE_TIME The time at which a <<MOON_PHASE>> occurs since 00:00:00 UTC, 1 January 1970.   REAL TIME 854
MOONRISE_TIME The <<TIME_OF_DAY>> of moonrise. The time is defined to occur when the geometric zenith distance of the centre of the <MOON> is 90,5666 arc degrees plus the apparent angular <<RADIUS>> of the <MOON> minus the apparent angular horizontal parallax of the <MOON>; that is, under normal atmospheric conditions at MSL, the upper limb of the <MOON> will then appear to be tangent with a level, unobstructed eastern horizon. No account is taken of the <<MOON_PHASE>>; that is, the <MOON> is always regarded as a disk in the sky and the upper limb might be dark. The 34 arc minute geometric depression of the centre of the <MOON> used for the computations is used to account for atmospheric refraction. The apparent angular <<RADIUS>> of the <MOON> varies from 15 to 17 arc minutes and its apparent angular horizontal parallax varies from 54 to 61 arc minutes.   CONSTRAINED_STRING   855
MOONSET_TIME The <<TIME_OF_DAY>> of moonset. The time is defined to occur when the geometric zenith distance of the centre of the <MOON> is 90,5666 arc degrees plus the apparent angular <<RADIUS>> of the <MOON> minus the apparent angular horizontal parallax of the <MOON>; that is, under normal atmospheric conditions at MSL, the upper limb of the <MOON> will then appear to be tangent with a level, unobstructed western horizon. No account is taken of the <<MOON_PHASE>>; that is, the <MOON> is always regarded as a disk in the sky and the upper limb might be dark. The 34 arc minute geometric depression of the centre of the <MOON> used for the computations is used to account for atmospheric refraction. The apparent angular <<RADIUS>> of the <MOON> varies from 15 to 17 arc minutes and its apparent angular horizontal parallax varies from 54 to 61 arc minutes.   CONSTRAINED_STRING   856
MOORING_CONNECTION_TYPE The type of connection used in a mooring <SYSTEM>.   ENUMERATION   857
MOORING_FACILITY_TYPE The type of a <MOORING_FACILITY>.   ENUMERATION   858
MOVEMENT_INDUCED_CONTRAIL-
_PRODUCTION_RATE
A number between 0 and 1 inclusive representing the linearly-scaled fraction of the production rate of contrails, vapour trails, or ionization phenomena that is induced by movement of a <VEHICLE> through the <ATMOSPHERE>. Zero means no contrail at all and one means maximum production.   REAL PURE_NUMBER 859
MULTIPASS_SURFACE_DEGRADATION The qualitative degree to which <TERRAIN> or a <LAND_TRANSPORTATION_ROUTE> has been degraded by the passage of <GROUND_VEHICLE>s; multipass surface degradation.   ENUMERATION   860
MULTIPLE An indication that an <OBJECT> represents more than one instance of that type of <OBJECT> type; multiple.   BOOLEAN   861
MULTIPLE_OBSTRUCTION_LIGHTS An indication that multiple obstruction <LIGHT>s are associated with an <OBJECT>.   BOOLEAN   862
MUNITION_BURST_COUNT The number of detonations of <MUNITION>s within a delineated <REGION>; munition burst count.   COUNT   863
MUNITION_FUSE_TYPE The type of fuse used in a <MUNITION>.   ENUMERATION   864
MUNITION_PROTECTION_LEVEL The level of protection against <MUNITION>s that a <STRUCTURE> provides for its contents.   ENUMERATION   865