| 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 |
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