Table 6.18 -- EDCS Attributes whose label begins with O
| Label | Definition | Attribute value type | EQ label | Related concepts | Code |
| OBJ_VERTICAL_DISPLACEMENT | The vertical distance measured from the lowest point of the base of an object (downhill side/downstream side) to the prevailing terrain surface. | REAL | LENGTH | 702 | |
| OBJ_VERTICAL_ORIENTATION | The orientation of the usual axis of an object relative to the vertical. | ENUMERATION | 703 | ||
| OBJECT_ASPECT | The portion or aspect of an object in relation to the terrain, e.g., the shoulder of a road or railroad, the banks of a river, or the roof eaves of a building. | ENUMERATION | 704 | ||
| OBJECT_BEARING | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the bearing of an object from an observer (on any point along the line towards the object). | REAL | PLANE_ANGLE | 705 | |
| OBJECT_CONFIGURATION | The type of object configuration. | ENUMERATION | 706 | ||
| OBJECT_ELEMENT_ORIENTATION | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the predominant linear pattern of the elements within an object. | REAL | PLANE_ANGLE | 707 | |
| OBJECT_ID_BASE_NUMBER | The unique object identification base number used within a specific geographic region to subsequently assign object identification numbers to new objects. | INTEGER | PURE_NUMBER | EA NUMERIC_OBJECT_IDENTIFIER | 708 |
| OBJECT_LABEL | The label applied to an object. | STRING | 709 | ||
| OBJECT_RANKING | The significance of an object, indicating the likely range of facilities available at or in the close vicinity. | ENUMERATION | 710 | ||
| OBJECT_RATE | A quantified rate associated with an object (e.g., cars crossing a bridge); coded using a structured text approach, e.g., "100(cars)[crossing bridge per hour]" where the type of unit is in parentheses ( ) and a unit qualifier is in brackets [ ]. | STRING | 711 | ||
| OBJECT_SHADED | Indicates that the object is shaded from direct sunlight or solar loading. | LOGICAL | 712 | ||
| OBJECT_SKY_IRRADIANCE | The irradiance from the sky (downwelling) onto an object. | REAL | IRRADIANCE | 713 | |
| OBJECT_TYPE_COUNT | The number of objects of this type within a delineated region. | COUNT | 714 | ||
| OBJECT_VARIANT | The numeric identifier used to indicate a variation of an object type given that all other object attribution may be identical to that of a different object of the same type. | INTEGER | PURE_NUMBER | 715 | |
| OBSERVATION_DECK_PRESENT | Indicates that one or more observation decks are present. | LOGICAL | 716 | ||
| OBSERVATION_PLATFORM_TYPE | The type of an observation platform. | ENUMERATION | 717 | ||
| OBST_HEIGHT_ACCURACY | The difference between the recorded heights above ground level of an object and its true height at 90% probability. | REAL | LENGTH | 718 | |
| OBSTACLE_HEIGHT_RANGE | A range indicating the maximum height or depth of obstacles within the delineated region of an object. | ENUMERATION | 719 | ||
| OBSTACLE_TYPE | The type of a military obstacle. | ENUMERATION | 720 | ||
| OCEAN_BASIN | The type of an ocean basin. | ENUMERATION | 721 | ||
| OCEAN_CURRENT_U | The speed of ocean current in the west-east direction where east is positive. | REAL | VELOCITY | 722 | |
| OCEAN_CURRENT_V | The speed of ocean current in the south-north direction where north is positive. | REAL | VELOCITY | 723 | |
| OCEAN_CURRENT_W | The speed of ocean current in the down-up direction where up is positive. | REAL | VELOCITY | 724 | |
| OCEAN_ELECNDCT_RATIO | The ratio of the electrical conductivity of ocean water, at a given temperature, to the conductivity of ocean water of practical salinity 35 at the same temperature, both at a pressure of 1 standard atmosphere. | REAL | PURE_NUMBER | 725 | |
| OCEAN_LUMINESCENCE | The rate of photon emittance of visible light from living organisms in a body of water. | REAL | VOLUMETRIC_ENTITY_EMIT_RATE | 726 | |
| OCEAN_SOUND_SPEED | The speed of sound in the ocean. | REAL | VELOCITY | 727 | |
| OCEAN_SPECIFIC_GRAVITY | The ratio of the mass of a volume of ocean water to the mass of an equal volume of distilled water at 4 degrees Celsius. | REAL | MASS_FRACTION | 728 | |
| OCEAN_SRF_INSTANTANEOUS_HGT | The instantaneous height of the ocean surface above the local mean level, where the local mean level is defined as MSL corrected for the tide; it rapidly varies over time as a result of local swells and waves. | REAL | LENGTH | 729 | |
| OCEAN_SRF_U_WIND_STRESS | The U component (west-east direction where east is positive) of the wind stress on the ocean surface. | REAL | MOMENTUM | EA OCEAN_SRF_V_WIND_STRESS, EA OCEAN_SRF_WIND_STRESS | 730 |
| OCEAN_SRF_V_WIND_STRESS | The V component (south-north direction where north is positive) of the wind stress on the ocean surface. | REAL | MOMENTUM | EA OCEAN_SRF_U_WIND_STRESS, EA OCEAN_SRF_WIND_STRESS | 731 |
| OCEAN_SRF_WIND_STRESS | The total wind stress on the ocean surface. | REAL | MOMENTUM | EA OCEAN_SRF_U_WIND_STRESS, EA OCEAN_SRF_V_WIND_STRESS | 732 |
| OCEAN_STATE_CODED | The roughness of the surface of the ocean in terms of the Douglas sea-state scale, a system of coded average wave heights. | ENUMERATION | 733 | ||
| OCEAN_SURFACE_TEMPERATURE | The temperature of the water at the surface of the ocean. | REAL | THERMO_TEMPERATURE | 734 | |
| OCEAN_TEMPERATURE | The temperature of the ocean water. | REAL | THERMO_TEMPERATURE | 735 | |
| OFFSHORE_PLATFORM_TYPE | The type of an offshore platform. | ENUMERATION | 736 | ||
| OIL_BARRIER_TYPE | The type of an oil barrier. | ENUMERATION | 737 | ||
| OILRIG_PRESENT | Indicates that an ocean oilrig exists within the spatial extent of the associated object. | LOGICAL | 738 | ||
| OMNIDIR_SNOISE_CONFIDENCE | The degree of confidence in the omni directional shipping noise spectral power level, based on the quantity and variability of the measurements; typically taken at 50 hertz. | ENUMERATION | 739 | ||
| OMNIDIR_SNOISE_CORRECTION | The correction to the omni directional shipping noise spectral power level; typically taken at 50 hertz. | REAL | FIELD_OR_POWER_LEVEL | 740 | |
| OMNIDIR_SNOISE_DECOR_TIME | The time required for omni directional shipping noise to decorrelate and/or disperse; typically taken at 50 hertz. | REAL | TIME | 741 | |
| OMNIDIR_SNOISE_SPATIAL_VAR | The degree of spatial variation of omni directional shipping noise measured in a nominal 111,120 kilometres (60 nautical miles) square cell of ocean.; typically taken at 50 hertz. | REAL | FIELD_OR_POWER_LEVEL | 742 | |
| OMNIDIR_SNOISE_SPECPL | The omni directional shipping noise spectral power level in the ocean volume at 50 Hz; this quantity may be qualified by a reference spectral frequency (if other than 50 Hz), and an ocean location. | REAL | PRESSURE_POWER_LEVEL | 743 | |
| OMNIDIR_SNOISE_SPECPL_TAPPS | The omni directional shipping noise spectral power level in the ocean volume at 50 Hz as predicted by TAPPS; this quantity may be qualified by a reference spectral frequency (if other than 50 Hz), and an ocean location. | REAL | PRESSURE_POWER_LEVEL | 744 | |
| ONMIDIR_SNOISE_SPECPL_FANM | The omni directional shipping noise spectral power level in the ocean volume at 50 Hz as predicted by FANM; this quantity may be qualified by a reference spectral frequency (if other than 50 Hz), and an ocean location. | REAL | PRESSURE_POWER_LEVEL | 745 | |
| OPACITY | The degree of line of sight blockage expressed as a fraction; on average, the fraction of the cross-section area of a non-homogeneous object that completely blocks line of sight. Opacity may also be further qualified by other attributes. | REAL | PURE_NUMBER | EA EM_BAND, EA EM_POLARIZATION_TYPE | 746 |
| OPENING_COVER_POSITION | The position of the covering of an opening, e.g., a canopy or hatch. | ENUMERATION | 747 | ||
| OPERATING_RESTRICTIONS_TYPE | The conditions during which the use of an object (e.g., a facility or an airspace) is restricted. | ENUMERATION | 748 | ||
| OPERATING_TIME | The times during which the use of an object (e.g., a facility or an airspace) is unrestricted. | ENUMERATION | 749 | ||
| OPERATIONAL | Indicates that the object is operational. | LOGICAL | 750 | ||
| OPPOSITE_FLOW_DIRECTION | The direction opposite to the flow value of an air route segment. | REAL | PLANE_ANGLE | 751 | |
| ORDINAL_RANK | The relative importance of an object. | ENUMERATION | 752 | ||
| ORDNANCE_PROTECTION_LEVEL | The degree of protection against ordnance that a structure provides for its contents. | ENUMERATION | 753 | ||
| ORIENTATION_ANGLE | The horizontal angle about the vertical axis of an object, from planetary geodetic north clockwise (viewed from above) to the major (longitudinal) axis of the object, measured in the local horizontal plane. If the object is square, the axis of 0 up to 90 arc degrees (or equivalent) shall be recorded. If the object is circular, 360 arc degrees (or equivalent) shall be recorded. | REAL | PLANE_ANGLE | 754 | |
| ORIENTATION_ANGLE_CODED | The categorized angular distance about the vertical axis of an object, from planetary geodetic north clockwise (viewed from above) to the major (longitudinal) axis of the object, measured in the local horizontal plane. If the object is circular, "omni-directional" shall be recorded. | ENUMERATION | 755 | ||
| OVER_WATER_OBSTRUCTION | Indicates that an obstruction exists over a region of navigable water. | LOGICAL | 756 | ||
| OVERALL_BRIDGE_HEIGHT | The vertical distance measured from the lowest point at ground or water level to the highest portion of bridge (including superstructure). | REAL | LENGTH | 757 | |
| OVERALL_VERTICAL_DIMENSION | The overall vertical dimension that includes both above and below ground/water components of an object. | REAL | LENGTH | 758 | |
| OVERHEAD_CLEARANCE | The least distance between the travelled way and any obstruction vertically above it. | REAL | LENGTH | 759 | |
| OVERHEAD_OBSTRUCTED | Indicates that there is less than 4,3 metres between the travelled way and any obstruction vertically above it. | LOGICAL | 760 | ||
| OVERHEAD_OBSTRUCTION_TYPE | The type of an overhead obstruction. | ENUMERATION | 761 |