Table 6.11 -- EDCS Attributes whose label begins with H
| Label | Definition | Attribute value type | EQ label | Related concepts | Code |
| HAIL_SIZE | The diameter of the largest hailstone observed. | REAL | LENGTH | 353 | |
| HARBOUR_FACILITY_TYPE | The type of operation/service supported by a harbour facility. | ENUMERATION | 354 | ||
| HARBOUR_IDENTIFIER | The textual identifier of a harbour; used for linking to an external database or reference. | KEY | 355 | ||
| HAZARD_SEVERITY | The severity of a hazard. | ENUMERATION | 356 | ||
| HAZE_TYPE | The type of haze present (e.g., moisture, dust, smoke, or vapour), resulting in decreased atmospheric visibility. | ENUMERATION | 357 | ||
| HEAVY_ICING_POTENTIAL | The frequency of occurrence of heavy icing potential on superstructures. Heavy icing on superstructures does not occur unless the air temperature is less than or equal to -9 degrees Celsius, and the wind speed is greater than or equal to 15,43 metres per second (30 knots). | REAL | PURE_NUMBER | 358 | |
| HEIGHT_ABOVE_SEA_BOTTOM | The vertical distance from sea bottom to the lowest portion of an object. | REAL | LENGTH | 359 | |
| HEIGHT_ABOVE_SURFACE_LEVEL | The distance measured vertically from the ground or water level. For physical objects, measured from the lowest point of the object base (downhill side/downstream side) to the highest point of the object. | REAL | LENGTH | 360 | |
| HEIGHT_RANGE | A range indicating the height of an object. | ENUMERATION | 361 | ||
| HEIGHT_TREE_CANOPY_BOTTOM | The height to the bottom of the tree canopy, i.e., the lowest significant canopy branch. | REAL | LENGTH | 362 | |
| HELIPAD_COUNT | The number of helipads associated with an object, e.g., an airfield or building. | COUNT | EA RUNWAY_COUNT | 363 | |
| HF_ACOUSTIC_SCATLYR_BOT_DEP | The depth, measured from the sea surface, of the lower boundary of the high frequency scattering layer. | REAL | LENGTH | 364 | |
| HF_ACOUSTIC_SCATLYR_TOP_DEP | The depth, measured from the sea surface, of the upper boundary of the high frequency scattering layer. | REAL | LENGTH | 365 | |
| HF_BOT_LOSS_PROV_IDENTIFIER | The numeric identifier of a high frequency bottom loss province; used for linking to an external database or reference. | INDEX | 366 | ||
| HIGH_CLOUD_BASE_ALTITUDE | The altitude of the base of a high-level cloud layer, relative to a vertical reference datum. High-level clouds are composed of ice crystals and are of the cirrus, cirrocumulus, and cirrostratus types. The altitude of the bases of these clouds range from 5 030 to 13 720 metres (16 500 to 45 000 feet) in the mid-latitudes. | REAL | LENGTH | 367 | |
| HIGH_CLOUD_COVERAGE | The fraction of the sky dome covered by all high-level clouds, as observed from the ground. | REAL | PURE_NUMBER | 368 | |
| HIGH_CLOUD_COVERAGE_CLIM | The quantity of historical occurrences of high cloud coverage, as observed by a ground observer. | INTEGER | PURE_NUMBER | 369 | |
| HIGH_CLOUD_TOP_ALTITUDE | The altitude of the top of a high-level cloud layer, relative to a vertical reference datum. High-level clouds are composed of ice crystals and are of the cirrus, cirrocumulus, and cirrostratus types. The altitude of the bases of these clouds range from 5 030 to 13 720 metres (16 500 to 45 000 feet) in the mid-latitudes. | REAL | LENGTH | 370 | |
| HIGH_CLOUD_TYPE | The type of high cloud. | ENUMERATION | 371 | ||
| HIGH_WATER_CURRENT_DIR | The horizontal angle, measured in a clockwise direction from above, from planetary geodetic north to the direction of water flow (current) at high water. | REAL | PLANE_ANGLE | 372 | |
| HIGH_WATER_CURRENT_RATE | The rate of water flow (current) at high water. | REAL | VELOCITY | 373 | |
| HIGHEST_AIRSPACE_ALT | The altitude AGL to the highest portion of the airspace. | REAL | LENGTH | 374 | |
| HIGHEST_AIRSPACE_ALT_LIMIT | The highest airspace altitude limit. | REAL | LENGTH | 375 | |
| HIGHEST_ELEVATION | The elevation above a specified vertical datum to the highest portion of an object. | REAL | LENGTH | 376 | |
| HIGHEST_GROUND_WATER_LEVEL | The highest annual average level of ground water. | REAL | LENGTH | 377 | |
| HISTORICAL_CFLOS_CLIM | The historical probability of a cloud free line of sight. | REAL | PURE_NUMBER | EA CLOUD_CVRG_CFLOS_CLIM | 378 |
| HORIZONTAL_CLEARANCE | The horizontal distance available to pass a load that extends laterally beyond the wheels of a vehicle. | REAL | LENGTH | 379 | |
| HORIZONTAL_CLEARANCE_CODED | The horizontal distance available to pass a load that extends laterally beyond the wheels of a vehicle. | ENUMERATION | 380 | ||
| HORIZONTAL_DATUM | The horizontal datum to which positions are referenced on the surface of the Earth.. | ENUMERATION | 381 | ||
| HOSPITAL_CAPACITY | The number of beds within a hospital. | INTEGER | PURE_NUMBER | 382 | |
| HOST_COUNTRY_LOC_IDENTIFIER | The location identifier assigned by a host country publication; used for linking to an external database or reference, typically containing the name and the location of an airport, navigation aid, weather station, or manned air traffic control facility. For example, the US Federal Aviation Administration and Transport Canada 7350.7* series of orders. | STRING | EA ICAO_LOCATION_INDICATOR | 383 | |
| HOUR_WITHIN_DAY | The ordinal index of the hour within the day, starting with the number "0" at midnight. | INTEGER | PURE_NUMBER | 384 | |
| HULK_TYPE | Classification of types of permanently moored floating structures (hulks), e.g., old ships. | ENUMERATION | 385 | ||
| HYDROGRAPHIC_BARRIER_TYPE | The type of barrier to hydrographic flow that an object presents, e.g., dam, weir, or rapids. | ENUMERATION | 386 | ||
| HYDROGRAPHIC_DEPTH | The depth of an object below water, measured from the top or surface of the object, referenced to a specified vertical datum; recorded values are positive numbers. | REAL | LENGTH | EA SOUNDING_DATUM, EA VERTICAL_DATUM | 387 |
| HYDROGRAPHIC_DEPTH_INFO | The accuracy or availability of hydrographic depth information for an object. | ENUMERATION | 388 | ||
| HYDROGRAPHIC_DRYING_HEIGHT | The height of an object, which tidal waters cover and uncover, referenced to a specified vertical datum. | REAL | LENGTH | EA SOUNDING_DATUM, EA VERTICAL_DATUM | 389 |
| HYDROGRAPHIC_LIGHT_TYPE | The type of light used for marine navigation. | ENUMERATION | 390 | ||
| HYDROGRAPHIC_ORIGIN | The origin of a hydrographic object. | ENUMERATION | 391 | ||
| HYDROGRAPHIC_SURFACE | The relative location referenced to a specified vertical datum, unless otherwise indicated. | ENUMERATION | 392 | ||
| HYDROGRAPHIC_TYPE | The type of annual water content of an inland hydrographic object, e.g., river or stream. | ENUMERATION | 393 | ||
| HYDROLOGIC_TYPE | The type of annual water content of a hydrologic object. | ENUMERATION | 394 | ||
| HYPSOGRAPHY_PORTRAYAL | The type of a hypsographic portrayal line. | ENUMERATION | 395 |