Table 6.21 -- EDCS Attributes whose label begins with R
| Label | Definition | Attribute value type | EQ label | Related concepts | Code |
| RADAR_BEACON_FREQUENCY | The specific frequency of a radar transponder beacon. | REAL | FREQUENCY | 845 | |
| RADAR_CROSS_SECTION | The power (or flux) reflected from an object toward the sensor per solid angle, divided by the incident power density times 4π. | REAL | AREA | 846 | |
| RADAR_GROUND_CLUTTER | The radar ground clutter expressed in average RCS per unit area of land. | REAL | PURE_NUMBER | 847 | |
| RADAR_OCEAN_CLUTTER | The radar ground clutter expressed in average RCS per unit area of ocean. | REAL | PURE_NUMBER | 848 | |
| RADAR_REFLECTOR_ANGLE | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the radar reflective side of an object. | REAL | PLANE_ANGLE | 849 | |
| RADAR_REFLECTOR_PRESENT | Indicates that the object has an associated radar reflector. | LOGICAL | 850 | ||
| RADAR_SIGNIFICANCE_FACTOR | The type of a man-made or natural object based on the object's predominant exposed surface material. | ENUMERATION | 851 | ||
| RADAR_STATION_TYPE | The type of a radar station. | ENUMERATION | 852 | ||
| RADAR_TRANSPONDER_TYPE | The type of a radar transponder beacon. | ENUMERATION | 853 | ||
| RADIANCE | The radiant power per unit source area per unit solid angle. Radiance may be qualified by other attributes, e.g., the electromagnetic band for which the value applies. | REAL | RADIANCE | EA EM_BAND | 854 |
| RADIANCE_AZANG_GEODETIC | The angle in the horizontal plane, measured in a clockwise direction from above, from planetary geodetic north to the projection of the radiance vector in the horizontal plane. | REAL | PLANE_ANGLE | 855 | |
| RADIANCE_AZANG_LOCAL_NORMAL | The angle in the plane perpendicular to the local normal, generally the local x-y plane that is perpendicular to the local z-axis, measured counter-clockwise from the azimuth reference vector, normally the local x-axis, to the projection of the radiance vector onto that plane. This attribute is generally used as a qualifier for other attributes, e.g., radiance as a function of angle. | REAL | PLANE_ANGLE | 856 | |
| RADIANCE_ELANG_HORIZONTAL | The angle in the vertical plane, measured from the horizontal plane, to the radiance vector. | REAL | PLANE_ANGLE | 857 | |
| RADIANCE_ELANG_LOCAL_NORMAL | The angle measured from the plane perpendicular to the normal vector to the radiance vector and defined positive if the radiance vector is in the same hemisphere as the normal vector and negative otherwise. This attribute is generally used as a qualifier for other attributes, e.g., radiance as a function of angle. | REAL | PLANE_ANGLE | 858 | |
| RADIANCE_FLUCTUATION_24HR | The amount of fluctuation (peak amplitude) of the surface radiance (or luminance) over a twenty-four hour period, expressed as a value from 0 to 255. | REAL | PURE_NUMBER | 859 | |
| RADIANCE_PHASE_CODED | The phase (in 15 arc degree increments) of radiance amplitude assuming a sine wave fluctuation, expressed as a value from 0 to 24. | INTEGER | PURE_NUMBER | 860 | |
| RADIANT_FLUX_DENSITY | The radiant flux density (e.g., net flux) is the energy flux through a unity surface. The same quantity is designated either the irradiance (when it is a received flux), or the exitance (when it is an emitted flux). | REAL | IRRADIANCE | 861 | |
| RADIO_STATION_TYPE | The type of a radio station. | ENUMERATION | 862 | ||
| RADIOLOGIC_AGENT_TYPE | The type of a radiologic substance that can kill, seriously injure, or incapacitate a person or animal through its physiological properties. | ENUMERATION | 863 | ||
| RADIOLOGIC_CLOUD_CONC | The concentration of a radiologic agent suspended in the atmosphere, e.g., as a cloud above the surface of an object such as the earth. | REAL | VOLUMIC_MASS | 864 | |
| RADIOLOGIC_SURFACE_CONC | The concentration of a radiologic agent contained in a layer on the surface of an object. | REAL | SURFACE_DENSITY | 865 | |
| RAILROAD_GAUGE | The type of railroad gauge in use. | ENUMERATION | 866 | ||
| RAILROAD_MAXIMUM_AXLE_LOAD | The maximum load allowable on any single railroad vehicle axle. | REAL | MASS | 867 | |
| RAILROAD_MAXIMUM_LOAD | The maximum load allowable on a railroad. | REAL | MASS | 868 | |
| RAILROAD_POWER_SOURCE | The source of electrical power for a railroad. | ENUMERATION | 869 | ||
| RAILROAD_TRACK_ARRANGEMENT | The arrangement of trackage on a single railroad bed, including both directions. | ENUMERATION | 870 | ||
| RAILROAD_TYPE | The type of railroad system used to support various transportation uses. | ENUMERATION | 871 | ||
| RAMP_POSITION | The position of the ramp or gate in terms of fractional deployment from a fully stowed/retracted/closed state. | REAL | PURE_NUMBER | 872 | |
| RAPID_CLASS | The relative difficulty of traversing a rapid, based on the International Scale of River Difficulty. | ENUMERATION | 873 | ||
| RECOMMENDED_TRACK_TYPE | The type of a recommended track. | ENUMERATION | 874 | ||
| RECORDING_DATE | The date when the object information was recorded, e.g., captured, edited, or deleted; coded as specified by ISO 8601:1988, 5.2.1.1. | STRING | 875 | ||
| RECORDING_DATE_TYPE | The type of date recorded. | ENUMERATION | 876 | ||
| REFLCT_AZANG_GEODETIC | The angle in the horizontal plane, measured in a clockwise direction from above, from planetary geodetic north to the projection of the reflected vector in the horizontal plane. | REAL | PLANE_ANGLE | 877 | |
| REFLCT_AZANG_LOCAL_NORMAL | The angle in the plane perpendicular to the local normal, generally the local x-y plane that is perpendicular to the local z-axis, measured counter-clockwise from the azimuth reference vector, normally the local x-axis, to the projection of the reflected vector onto that plane. This attribute is generally used as a qualifier for other attributes, e.g., reflectivity as a function of reflected angle. | REAL | PLANE_ANGLE | 878 | |
| REFLCT_ELANG_HORIZONTAL | The angle in the vertical plane, measured from the horizontal plane, to the reflected vector. | REAL | PLANE_ANGLE | 879 | |
| REFLCT_ELANG_LOCAL_NORMAL | The angle measured from the plane perpendicular to the normal vector to the reflected vector and defined positive if the reflected vector is in the same hemisphere as the normal vector and negative otherwise. This attribute is generally used as a qualifier for other attributes, e.g., reflectivity as a function of reflected angle. | REAL | PLANE_ANGLE | 880 | |
| REFLECTION_TYPE | The type of sonar reflection detected. | ENUMERATION | 881 | ||
| REFRCT_INDEX_IMAGINARY_PART | The imaginary part of a complex refraction index which, in turn, is defined as the square root of the product of the complex relative permitivity and permeability of the material; imaginary part of refraction index can also be derived from the attenuation index or absorption coefficient of the material. The imaginary part of a complex refraction index may be qualified by other attributes, e.g., the electromagnetic band for which the value applies. | REAL | PURE_NUMBER | EA EM_BAND, EA REFRCT_INDEX_REAL_PART | 882 |
| REFRCT_INDEX_REAL_PART | The real part of a complex refraction index which, in turn, is defined as the square root of the product of the complex relative permitivity and permeability of the material; real part of refraction index can also be derived from the attenuation index or absorption coefficient of the material. The real part of a complex refraction index may be qualified by other attributes, e.g., the electromagnetic band for which the value applies. | REAL | PURE_NUMBER | EA EM_BAND, EA REFRCT_INDEX_IMAGINARY_PART | 883 |
| REGIONAL_STYLE | Description of the architectural style of a structure characterized by the region of the world where that style is commonly used. | ENUMERATION | 884 | ||
| RELATIVE_HORIZ_ACCURACY | The difference between the recorded horizontal coordinates of an object and its relative position expressed as a circular error at 90% probability. | REAL | LENGTH | EA ABSOLUTE_HORIZ_ACCURACY | 885 |
| RELATIVE_HUMIDITY | The ratio of vapour pressure to saturation vapour pressure, where vapour pressure is the pressure exerted by the molecules of water vapour, and saturation vapour pressure is the pressure exerted by molecules of water vapour in air that has attained saturation. | REAL | PURE_NUMBER | 886 | |
| RELATIVE_HUMIDITY_ERROR | The potential error in the relative humidity. | REAL | PURE_NUMBER | 887 | |
| RELATIVE_HUMIDITY_MIN_TEMP | The ratio of vapour pressure to saturation vapour pressure at the time of the lowest temperature for the preceding twenty-four hours. | REAL | PURE_NUMBER | EA RELATIVE_HUMIDITY | 888 |
| RELATIVE_LOCATION | The location of an object relative to the surrounding region or water. | ENUMERATION | 889 | ||
| RELEASABILITY_RSTRCTS | The releasability restrictions of information about an object. | STRING | 890 | ||
| RELIGIOUS_DENOMINATION | The name of the religious order at a site. | ENUMERATION | 891 | ||
| REQUIRED_PORT_ACCESS | Indicates that a hydrographic object is used for access to a required port, or that an object is in a water body used for access to a required port. | LOGICAL | 892 | ||
| RESCUE_STATION_TYPE | The type of a rescue station. | ENUMERATION | 893 | ||
| RESERVOIR_TYPE | The method of containing water in a reservoir. | ENUMERATION | 894 | ||
| REYNOLDS_NUMBER | The turbulence of fluid flow in a pipe (fluid dynamics) or flow across a surface (aerodynamic skin heating models and other thermal modelling applications), described by a number between 0,0 and 1,0 . | REAL | PURE_NUMBER | 895 | |
| RF_DIRECTIVITY | The side or sides of an object that produce the greatest reflectivity potential to electromagnetic radiation. | ENUMERATION | 896 | ||
| RF_REFRCT_INDEX_MODIFIED | The atmospheric index of refraction for radio frequency propagation that has been modified to account for the planetary curvature and the variation of the index of refraction as a function of height. The index of refraction is the ratio of the wavelength or phase velocity of an electromagnetic wave in a vacuum to that in the medium or substance. | REAL | PURE_NUMBER | EA REFRCT_INDEX_IMAGINARY_PART, EA REFRCT_INDEX_REAL_PART | 897 |
| RGB_COLOUR_BLUE | The fractional blue colour component value of an object in accordance with the RGB colour model. | REAL | PURE_NUMBER | EA RGB_COLOUR_GREEN, EA RGB_COLOUR_RED | 898 |
| RGB_COLOUR_GREEN | The fractional green colour component value of an object in accordance with the RGB colour model. | REAL | PURE_NUMBER | EA RGB_COLOUR_BLUE, EA RGB_COLOUR_RED | 899 |
| RGB_COLOUR_RED | The fractional red colour component value of an object in accordance with the RGB colour model. | REAL | PURE_NUMBER | EA RGB_COLOUR_BLUE, EA RGB_COLOUR_GREEN | 900 |
| RIGHT_ABOVE_BANK_SLOPE | The slope of the right bank (facing downstream) above water level. | REAL | PURE_NUMBER | EA RIGHT_BELOW_BANK_SLOPE | 901 |
| RIGHT_BANK_HEIGHT | The height of the right bank (facing downstream) above the water level to the average water level. | REAL | LENGTH | 902 | |
| RIGHT_BANK_HEIGHT_RANGE | The predominant height range of the right bank (facing downstream), measured from mean water level to the first break in slope above the mean water level. | ENUMERATION | 903 | ||
| RIGHT_BANK_SLOPE_RANGE | The predominant slope range of the right bank (facing downstream) measured from mean water level to the first break in slope above the mean water level. | ENUMERATION | 904 | ||
| RIGHT_BANK_VEGETATION | A range indicating the density of vegetation found on the right bank. | ENUMERATION | EA LEFT_BANK_VEGETATION | 905 | |
| RIGHT_BELOW_BANK_SLOPE | The slope of the right bank (facing downstream) below water level. | REAL | PURE_NUMBER | EA RIGHT_ABOVE_BANK_SLOPE | 906 |
| ROAD_INTERCHANGE_TYPE | The design of an interchange. | ENUMERATION | 907 | ||
| ROAD_JUNCTION_CONNECTIVITY | The type of connectivity among roads meeting at a junction. | ENUMERATION | 908 | ||
| ROAD_TYPE | The type of a road. | ENUMERATION | 909 | ||
| ROCK_FORMATION_STRUCTURE | The structure of a rock formation or outcrop. | ENUMERATION | 910 | ||
| ROLL_ANGLE | The angular distance about the forward axis of an object, from the local vertical clockwise to the vertical axis of the object, measured in the local vertical plane. The forward axis of the object is the axis which passes through the object centre and is directed towards/through the forward part or surface (front) of the object. Clockwise rotation about the forward axis (the axis of roll) is determined in the direction of the front of the object (right hand rule). The vertical axis of the object is normal to its forward axis. | REAL | PLANE_ANGLE | 911 | |
| ROOF_COVER | The fractional roof cover within the delineated object's extent. | REAL | PURE_NUMBER | 912 | |
| ROOF_PATTERN_PREDOMINANT | The predominant visual patterns of a roof, usually describing the shape and arrangement of shingles, but may also describe smooth, corrugated, and gravel roofs. | ENUMERATION | 913 | ||
| ROOF_SHAPE | The type of roof shape. | ENUMERATION | 914 | ||
| ROOF_SRF_MTRL_PREDOMINANT | The predominant outermost roofing material. | ENUMERATION | 915 | ||
| ROUTE_INTENDED_USE | The intended use of the route. | ENUMERATION | 916 | ||
| ROUTE_WEATHER_TYPE | The weather type of a route. | ENUMERATION | 917 | ||
| ROW_COUNT | The number of rows comprising an object. | COUNT | 918 | ||
| ROW_DISTANCE | The distance between each row comprising an object; may be either a mean value, or a constant value where rows are equally spaced. | REAL | LENGTH | 919 | |
| ROW_SPACING_INTERNAL | The distance between the sub-objects within each row comprising an object; may be either a mean value, or a constant value where sub-objects are equally spaced within a row. | REAL | LENGTH | 920 | |
| RUNWAY_APANG_LGTINT | The fraction of maximum intensity of airport runway angle of approach indicator lights, e.g., VASI or PAPI. | REAL | PURE_NUMBER | 921 | |
| RUNWAY_APPROACH_LGTINT | The fraction of maximum intensity of airport runway approach lights. | REAL | PURE_NUMBER | 922 | |
| RUNWAY_CENTER_LGTINT | The fraction of maximum intensity of airport runway centreline lights. | REAL | PURE_NUMBER | 923 | |
| RUNWAY_COUNT | The number of runways in an airport or airfield. | COUNT | 924 | ||
| RUNWAY_EDGE_LGTINT | The fraction of maximum intensity of airport runway edge lights. | REAL | PURE_NUMBER | 925 | |
| RUNWAY_END_BEARING | The horizontal angle that represents the compass direction of bearing from the near end of a runway to the far end as viewed from an approaching or departing aircraft. | REAL | PLANE_ANGLE | 926 | |
| RUNWAY_HIGH_END_IDENTIFIER | The specification of the higher degree identification of the runway in a two-digit identifier ranging from 19 - 36, determined from the approach direction, derived from the runway magnetic heading (high end) rounded to the nearest ten degrees, and divided by ten. Designated in accordance with appropriate host nation documents. Analyst derived runway numbers will use six arc degrees as the break off point for the next highest number. In the case of parallel runways, a third character shall be entered to differentiate between left (L), right (R), centre (C), or short take-off and landing (S) runway positions. A (T) True will be entered when the runway identifier and heading are true with no magnetic variation applied. | STRING | EA RUNWAY_LOW_END_IDENTIFIER | 927 | |
| RUNWAY_LIGHTING_INTENSITY | The fraction of maximum intensity of airport runway lighting. | REAL | PURE_NUMBER | 928 | |
| RUNWAY_LOW_END_IDENTIFIER | The specification of the lower degree identification of the runway in a two-digit identifier ranging from 01 - 18, determined from the approach direction, derived from the runway magnetic heading (low end) rounded to the nearest ten degrees, and divided by ten. Designated in accordance with appropriate host nation documents. Analyst derived runway numbers will use six arc degrees as the break off point for the next highest number. In the case of parallel runways, a third character shall be entered to differentiate between left (L), right (R), centre (C), or short take-off and landing (S) runway positions. A (T) True will be entered when the runway identifier and heading are true with no magnetic variation applied. | STRING | EA RUNWAY_HIGH_END_IDENTIFIER | 929 | |
| RUNWAY_REIL_INTENSITY | The fraction of maximum intensity of airport REILs. | REAL | PURE_NUMBER | 930 | |
| RUNWAY_RELATIVE_POSITION | The relative position of a runway for an approaching or departing aircraft to/from an airport or airfield. | ENUMERATION | 931 | ||
| RUNWAY_STOP_BAR_LGTINT | The fraction of maximum intensity of airport runway stop bar lights. | REAL | PURE_NUMBER | 932 | |
| RUNWAY_STROBE_LGTINT | The fraction of maximum intensity of airport runway strobes. | REAL | PURE_NUMBER | 933 | |
| RUNWAY_SURFACE_CONDITION | The surface conditions of an airfield/airport runway. | ENUMERATION | 934 | ||
| RUNWAY_THRESHOLD_LGTINT | The fraction of maximum intensity of airport runway threshold lights. | REAL | PURE_NUMBER | 935 | |
| RUNWAY_TOUCH_DOWN_LGTINT | The fraction of maximum intensity of airport runway touch down lights. | REAL | PURE_NUMBER | 936 | |
| RUNWAY_VISIBILITY_METHOD | The method used to collect runway visibility data. | ENUMERATION | 937 | ||
| RUNWAY_VISUAL_RANGE | The maximum horizontal distance down an identified runway of an airfield that a pilot can see and identify standard high intensity lights. | REAL | LENGTH | 938 |