Table 5.23 — ECs whose label begins with S
| Label | Concept definition | Code |
| SABKHA | A natural <TERRAIN_DEPRESSION> in an arid or semi-arid <TERRAIN_SURFACE_REGION> the bed of which is covered with salt encrusted clayey <SOIL>; a sabkha or sebkha. | 1051 |
| SAFARI_PARK | An <ANIMAL_PARK> in which wild <NON_HUMAN_ANIMAL>s are allowed to roam free in an environment designed to resemble their natural habitat and are observed by visitors riding through the <PARK> in <MOTOR_VEHICLE>s; a safari park. | 1052 |
| SAFETY_FAIRWAY | A <MARINE_ROUTE> established for the safe passage of <VESSEL>s through either offshore <PETROLEUM_FIELD>s or <MINEFIELD>s; a safety fairway. | 1053 |
| SAILING_VESSEL | A <WATER_SURFACE_VESSEL> that is primarily moved by the force created by the effect of the <WIND> on attached sails; a sailing vessel or sailing ship. | 1054 |
| SALT_EVAPORATOR | A shallow <RESERVOIR>, which is normally man-made, that is used for the natural evaporation of <WATER> for the collection of salt; a salt evaporator. | 1055 |
| SALT_PAN | A flat <TRACT> covered by natural salt deposits on its <SURFACE>; a salt-pan. | 1056 |
| SANATORIUM | A <FACILITY> that houses an institution for the treatment of chronic diseases or for medically supervised recuperation; a sanatorium. | 1057 |
| SAND | A <MATERIAL> consisting of fine <PARTICLE>s of <ROCK>s (mainly siliceous); sand [SOED, "sand", 1.a]. | 1058 |
| SAND_BAR | A bar and/or low <RIDGE> of <SAND> along the <SHORE> of a <LAKE>, <RIVER>, or <OCEAN> that is built-up to the <WATERBODY_SURFACE> by <WATER_WAVE>s or <WATER_CURRENT>s. | 1059 |
| SAND_DUNE | A mound or <RIDGE> of loose <SAND> formed by the <WIND>; a sand dune [SOED, "dune"]. | 1060 |
| SAND_DUNE_REGION | A <TRACT> covered by <SAND_DUNE>s; a sand dune region. | 1061 |
| SAND_LINE | A <LINE> that delineates a <TRACT> of <SAND> from an adjacent <WATERBODY> and that is covered and uncovered depending on the <<ELEVATION>> of its <SURFACE> and the current <<ELEVATION>> of the <WATERBODY_SURFACE>; a sand line. | 1062 |
| SATELLITE | A <CELESTIAL_BODY> that revolves around a larger <CELESTIAL_BODY>, usually a <PLANET>; a satellite [SOED, "satellite", A.2.a]. | 1063 |
| SATELLITE_GROUND_STATION | A <STRUCTURE> with an associated <AERIAL> used for tracking, control, transmission, and/or reception of signals from <ARTIFICIAL_SATELLITE>s; a satellite ground station. | 1064 |
| SATURN | The primary <PLANET> of the <SUN> that is sixth in distance from the <SUN>, with an orbital mean <<RADIUS>> of approximately 1 429,4 million kilometres; Saturn. | 1065 |
| SAWMILL | A <BUILDING> where <LOG>s are processed into lumber; a sawmill. | 1066 |
| SCENIC_LOOKOUT | A <LOCATION>, which is generally elevated, with <FACILITY>s for observing the scenery; a scenic lookout. | 1067 |
| SCHOOL_BUILDING | A <BUILDING> used for instruction; a school building. | 1068 |
| SCIENCE_BUILDING | A <BUILDING> supporting scientific experimentation or research, including scholarly investigation or inquiry, intended to ultimately result in commercial products; a science building. | 1069 |
| SCIENCE_FACILITY | A <FACILITY> including one or more <SCIENCE_BUILDING>s; a science facility. | 1070 |
| SCRAPYARD | A <TRACT> used to collect scrap metal for reprocessing; a scrapyard. | 1071 |
| SCRUB_LAND | A <TRACT> covered by uncultured <PLANT>s that may have some woody tissue; scrub land or brush land. | 1072 |
| SEA | A salty <WATERBODY> more or less confined by continuous <LAND> or chains of <ISLAND>s and forming a distinct <REGION>; a sea. | 1073 |
| SEAL_POD | A <POD> of seals. | 1074 |
| SEAMOUNT | A <WATERBODY_FLOOR_PINNACLE> rising 1 000 metres or more from the <WATERBODY_FLOOR> of a <SEA> or <OCEAN> and of limited extent across its summit; a seamount. | 1075 |
| SEAPLANE | An <AIRCRAFT> capable of taking off and landing on a <WATERBODY_SURFACE>; a seaplane [SOED, "seaplane"]. | 1076 |
| SEAPLANE_BASE | A <FACILITY> supporting <SEAPLANE>s; a seaplane base. | 1077 |
| SEAPLANE_RUN | A designated <REGION> of a <WATERBODY_SURFACE> outlined by visual markings used by <SEAPLANE>s to land and take off; a seaplane run. | 1078 |
| SEAWALL | A <WALL> built to protect a <SHORE> from erosion; a seawall. | 1079 |
| SEAWEED | A <REGION> of large green, brown, or dark red <VEGETATION> (for example: kelp and/or seaweed) growing in a salt <WATER>, typically cold, environment. | 1080 |
| SEDIMENT | Unconsolidated <MATERIAL> composed of <PARTICLE>s deposited from either a suspension in <AIR>, <ICE>, or <WATER> or from solution in <WATER>; sediment [SOED, "sediment", 3]. | 1081 |
| SELF_PROPELLED_ARTILLERY | Self-propelled <FIELD_ARTILLERY>. | 1082 |
| SEMINARY | A <FACILITY> used as a school, especially a theological school, for the training of priests, ministers, or rabbis; a seminary [AHD, "seminary", 1.a]. | 1083 |
| SENIOR_CITIZENS_HOME | A residential <BUILDING> housing a group of elderly <HUMAN>s; a senior citizens home. | 1084 |
| SET | A possibly empty collection of distinct <OBJECT>s; a set. | 1085 |
| SETTLEMENT | A concentration of <DWELLING>s that is smaller in size than a <TOWN>; a settlement or village. | 1086 |
| SETTLING_POND | A small <RESERVOIR> where solid matter is precipitated from a liquid by evaporating or settling; a settling pond. | 1087 |
| SEWER | An artificial channel or conduit, usually covered and under the <TERRAIN>, for carrying off and discharging waste, storm <WATER>, and/or refuse from <BUILDING>s and <BUILT_UP_REGION>s; a sewer [SOED, "sewer", 2.a]. | 1088 |
| SHADOW | A <REGION> of partial darkness produced by an <OBJECT> intercepting rays of light (for example: the direct rays of the <SUN>); a shadow. | 1089 |
| SHANTY_TOWN | A <TOWN>, or a section of a <TOWN>, consisting chiefly of shacks; a shanty town. | 1090 |
| SHARP_CURVE | A curve along a <LAND_TRANSPORTATION_ROUTE> that may cause restrictions in traffic of <GROUND_VEHICLE>s; a sharp curve. | 1091 |
| SHEAR_WALL | The <WALL> of the <EXCAVATION> within a <QUARRY> or <EXTRACTION_MINE>; a shear wall. | 1092 |
| SHED | A relatively small <BUILDING>, which usually has one or more open sides, that is typically used for storage; a shed. | 1093 |
| SHEERLEGS | Two or three spars standing on end and lashed together aloft that serve as a derrick or tripod to lift heavy weights, to step or lower <MAST>s or stacks, or for similar marine purposes; sheer legs. | 1094 |
| SHELLFISH_BED | A <REGION> in a shallow <WATERBODY> where shellfish breed and may be cultivated; a shellfish bed. | 1095 |
| SHELTER | A <STRUCTURE> for protecting <EQUIPMENT> or <HUMAN>s; a shelter. | 1096 |
| SHIPYARD | A <SITE> where <VESSEL>s are built or repaired; a shipyard [SOED, "shipyard"]. | 1097 |
| SHOAL | A <MARINE_REGION> over which there is a <<WATER_DEPTH>> of twenty metres or less, and which is composed of unconsolidated <MATERIAL>, except <CORAL> or <ROCK>; a shoal. | 1098 |
| SHOPPING_CENTRE | A group of <RETAIL_FACILITY>s, often including <RESTAURANT>s and other businesses, having a common <VEHICLE_LOT>; a shopping centre [AHD, "shopping center"]. | 1099 |
| SHORE | The narrow <TERRAIN_STRIP> in immediate contact with a <WATERBODY>, including the <TRACT> between high and low water <LINE>s; a shore. | 1100 |
| SHORE_PROTECTION_STRUCTURE | A <STRUCTURE> that protects a <HARBOUR> or <SHORE> from the forces of the <SEA>. EXAMPLES <BREAKWATER>, <GROIN>. |
1101 |
| SHORE_REVETMENT | A <REVETMENT> placed along a <SHORE> to stabilize the <WATERBODY_BANK> and to protect it from the erosive action of flowing <WATER>. | 1102 |
| SHORELINE | The <LAND_WATER_BOUNDARY> between the <SHORE> or <BEACH> and a defined mean water level; a shoreline. EXAMPLE The high water shoreline would be the <LAND_WATER_BOUNDARY> with mean high water. |
1103 |
| SHORELINE_CONSTRUCTION | A fixed (not afloat) artificial <STRUCTURE> attached to a <SHORE> and normally used for berthing and protection of <VESSEL>s; a shoreline construction. | 1104 |
| SHORELINE_LANDING_PLACE | A <REGION> on a <SHORE> where landing from a <WATERBODY> is possible; a shoreline landing place. | 1105 |
| SHORELINE_LANDING_STAIR | A <STAIR> on a <SHORE> constructed to connect between the <LAND> and the <WATERBODY> on different levels; a shoreline landing stair. | 1106 |
| SHOVEL | <EQUIPMENT> for <EXCAVATION> that moves <MATERIAL>s by a scooping action; a shovel. | 1107 |
| SHRIMP_BED | A naturally occurring, significant grouping of shrimp that persists over a significant period; a shrimp bed. | 1108 |
| SHRINE | A <WORSHIP_PLACE> or place for devotion; a shrine [SOED, "shrine", 6]. | 1109 |
| SHRUB | A low growing, multi-stemmed woody <PLANT>; a shrub [AHD, "shrub"]. | 1110 |
| SIDEWALK | A paved pedestrian walkway, usually made of concrete, typically located adjacent and parallel to a <ROAD>; a sidewalk. | 1111 |
| SIPHON | A <PIPE> used for conveying liquid from one level to a lower level, using the liquid pressure differential to force a column of the liquid up to a higher level before it falls to the outlet; a siphon [SOED, "siphon", 2.a]. | 1112 |
| SITE | The <LOCATION> of an actual or planned <NON_EMPTY_SET> of <STRUCTURE>s; a site [AHD, "site", 1]. | 1113 |
| SKI_JUMP | A <RAMP> used for ski jumping; a ski jump. | 1114 |
| SKI_TRACK | A <ROUTE> prepared for skiing; a ski track. | 1115 |
| SKYLIGHT | A small <APERTURE> filled in with a transparent or translucent <MATERIAL> (for example: glass) that admits daylight through a <ROOF> and/or <ROOM_CEILING>; a skylight. | 1116 |
| SLIPWAY | A <RAMP> for launching and recovering <VESSEL>s; a slipway or patent slip. | 1117 |
| SLOPE_REGION | A <TERRAIN_SURFACE_REGION> where the <<TERRAIN_SLOPE>> is within a set range of values. | 1118 |
| SLUDGE_GATE | A <GATE> used to regulate the flow of sludge from a <SETTLING_POND>; a sludge gate. | 1119 |
| SLUICE | An open, inclined conduit for <WATER> that is fitted with a <SLUICE_GATE> and may be employed in mine ore washing operations; a sluice. | 1120 |
| SLUICE_GATE | A <GATE> used to regulate the flow of <WATER> in a <SLUICE>; a sluice gate. | 1121 |
| SMALL_CRAFT_FACILITY | A <FACILITY> with functions or services generally of interest for small craft or pleasure <WATER_SURFACE_VESSEL>s. | 1122 |
| SMALL_HAIL | <HAIL> with an <<OUTSIDE_DIAMETER>> less than 0,64 centimetre, which is a form of <ICE_PELLETS>; small hail (US). | 1123 |
| SMOKE | A visible <NON_AQUEOUS_CLOUD>, <PLUME>, or <PUFF> composed of carbon and other <PARTICLE>s given off by burning or smouldering <MATERIAL>s; smoke [SOED, "smoke", A.1]. | 1124 |
| SMOKESTACK | A <COMBUSTION_PRODUCT_DISCHARGE_STRUCTURE> consisting of a large, tall <PIPE> which is often free-standing; a smokestack [AHD, "smokestack"]. | 1125 |
| SNAG | A stem or trunk of a <TREE> below a <WATERBODY_SURFACE>; a snag. | 1126 |
| SNOW_GRAINS | <SOLID_PRECIPITATION> of very small opaque white <PARTICLE>s of <ICE> that fall from a <CLOUD> and are fairly flat or elongated with <<OUTSIDE_DIAMETER>>s generally less than 1 millimetre; the solid equivalent of <DRIZZLE>; snow grains. | 1127 |
| SNOW_GROUND_COVER | The layer formed by <SNOW_PRECIPITATION> as it accumulates on the <LAND>; snow ground cover. | 1128 |
| SNOW_PRECIPITATION | <SOLID_PRECIPITATION> composed of white or translucent crystals of <ICE> that are chiefly in complex branch hexagonal form and are often agglomerated into snowflakes or the layer formed by them on the <LAND>; snow. | 1129 |
| SNOW_REGION | A <REGION> in which <SNOW_PRECIPITATION> is falling. | 1130 |
| SNOW_SHED | A <PROTECTION_SHED> against slides of <SNOW_GROUND_COVER>; a snow shed. | 1131 |
| SNOWFIELD | A <TRACT> covered by <SNOW_GROUND_COVER>; a snowfield. | 1132 |
| SODA_EVAPORATOR | A shallow <RESERVOIR>, normally man-made, used for the natural evaporation of <WATER> for the collection of soda; soda evaporator. | 1133 |
| SOIL | A <MATERIAL> composed of fragmented <PARTICLE>s of <ROCK>, decomposed <PLANT>s, <WATER>, and <AIR> that typically comprises a thin top layer of the <LAND>; soil [SOED, "soil", 4]. | 1134 |
| SOLAR_PANEL | A <NON_EMPTY_SET> of solar cells for converting sunlight into electrical energy or heat; a solar panel. | 1135 |
| SOLAR_SYSTEM | A <STAR> and its family of <PLANET>s, natural <SATELLITE>s, <ASTEROID>s, and <COMET>s that are captured by its gravity; a solar system. | 1136 |
| SOLID_MESH | A <MESH> with a related <MESH_SOLID_SET>; a solid mesh. | 1137 |
| SOLID_PRECIPITATION | <PRECIPITATION> of <ICE>; solid precipitation. | 1138 |
| SOUND_CHANNEL | A horizontal layer in a <WATERBODY> that is bounded by levels at which the <<WATERBODY_SOUND_SPEED>> is greater than at any level within the layer; a sound channel. | 1139 |
| SOUND_CHANNEL_AXIS | The alignment axis in a <SOUND_CHANNEL> determined by the depth at which the minimum <<WATERBODY_SOUND_SPEED>> occurs. | 1140 |
| SOUNDING | A measured <<WATER_DEPTH>> or spot <<WATER_DEPTH>>; a sounding. | 1141 |
| SOUNDING_DATUM | The vertical, typically tidal, <SURFACE_DATUM> to which <SOUNDING>s and <<HYDROGRAPHIC_DRYING_HEIGHT>>s are referenced; usually taken to correspond to a low water stage of the <TIDE>; the sounding datum. | 1142 |
| SPACE | The <REGION> extending in all <DIRECTION>s in which all matter lying outside celestial body <ATMOSPHERE>s is located; the near vacuum occupying the <REGION>s between <CELESTIAL_BODY>s; space [SOED, "space", II.12.a]. | 1143 |
| SPACECRAFT | A <VEHICLE> operating mainly in <SPACE>; a spacecraft [SOED, "spacecraft"]. | 1144 |
| SPACEPORT | A <FACILITY> for the launch, and sometimes the landing, of <SPACECRAFT>; a spaceport [SOED, "spaceport"]. | 1145 |
| SPECIAL_ELECTRONIC_WINGED- _AIRCRAFT |
A winged <AIRCRAFT> designed or designated for special electronic operations. | 1146 |
| SPECIAL_OPERATIONS_HELICOPTER | A <HELICOPTER> designed or designated for special operations. | 1147 |
| SPECIAL_USE_AIRSPACE | An <AIRSPACE> identified by a delimited <REGION> where activities must be confined because of their nature and/or where limitations may be imposed on <AIRCRAFT> operations not associated with those activities; a special use airspace. | 1148 |
| SPECIAL_USE_AIRSPACE_COMPONENT | A <COMPONENT> of a <SPECIAL_USE_AIRSPACE>. | 1149 |
| SPILLWAY | A passage for surplus <WATER> to run over or around a <DAM>; a spillway. | 1150 |
| SPORTS_ARENA | An arena with tiered seats or terraces for spectators of athletic or sporting events [SOED, "stadium", 3]. | 1151 |
| SPOT_ELEVATION | A designated <LOCATION> with an <<ELEVATION>>; a spot elevation. | 1152 |
| SPRING | A natural outflow of <WATER> from below the <LAND>; a spring. | 1153 |
| SPRING_TIDE | The <TIDE>s of increased range occurring near the times of the full and new <<MOON_PHASE>>s. | 1154 |
| STADIUM | A <SPORTS_ARENA> or a <TRACT> used for athletic sports with tiered seats or terraces for spectators; a stadium [SOED, "stadium", 3]. | 1155 |
| STAIR | A series of fixed steps leading from one level to another, especially such a series leading from one <FLOOR_LEVEL> to another inside a <STRUCTURE>; a stair [SOED, "star", A.I.1]. | 1156 |
| STAIR_SET | A <NON_EMPTY_SET> of <STAIR>s connecting three or more <FLOOR_LEVEL>s in an uninterrupted sequence. | 1157 |
| STAKE | A small <MARKER> used to identify <WATER_CHANNEL>s or to mark dangers (for example: <STONE>s and/or <SHOAL>s); a stake. | 1158 |
| STAR | A large, coherent, roughly spherical, gaseous <CELESTIAL_BODY> that is luminous by virtue of internal nuclear reactions; a star [SOED, "star", A.I.1]. | 1159 |
| STATIONARY_FRONT | An <ATMOSPHERIC_FRONT> between warm and cold <AIR_MASS>s that is moving at a speed less than 2,575 metres per second (five knots); a stationary front or a quasi-stationary front. | 1160 |
| STEEL_MILL | A <FACILITY> for the production of fabricated structural steel products (for example: girders and/or plates); a steel mill. | 1161 |
| STEEP_GRADE | A stretch along a <LAND_TRANSPORTATION_ROUTE> where the slope is high enough to slow, hinder, or even stop traffic; a steep grade. | 1162 |
| STEEPLE | A <STRUCTURE>, usually topped by a point, that may be erected on the <ROOF> of a <BUILDING>; a steeple. | 1163 |
| STELLAR_BURST_RADIO- _FREQUENCY_EMISSION |
A burst emission from a <STAR> at radio <<WAVELENGTH>>s that often sweep through a range of <<FREQUENCY>>s and last from minutes to days; a stellar burst radio frequency emission. | 1164 |
| STELLAR_ENERGETIC_PARTICLE | An energetic charged <PARTICLE> emanating from a <STAR>; a stellar energetic particle. EXAMPLES Electron, proton, alpha <PARTICLE>. |
1165 |
| STELLAR_FLUX_RADIO_FREQUENCY- _EMISSION |
A continuous (flux) emission from a <STAR> at radio <<WAVELENGTH>>s; a stellar flux radio frequency emission. | 1166 |
| STELLAR_WIND | A high-speed stream of <STELLAR_ENERGETIC_PARTICLE>s in <SPACE>; a stellar wind. | 1167 |
| STONE | A piece of <ROCK> of a small or moderate size; a stone [SOED, "stone", A.1.a] or rock (US). | 1168 |
| STORAGE_BUNKER | A <BUNKER> that is used as a <STORAGE_STRUCTURE>; a storage bunker or storage mound. | 1169 |
| STORAGE_CONTAINER | A <CONTAINER> used for the storage of solid, liquid, or gaseous <MATERIAL>s; a storage container. | 1170 |
| STORAGE_DEPOT | A <FACILITY> including one of more <STORAGE_STRUCTURE>s; a storage depot. | 1171 |
| STORAGE_PIT | An excavated <STORAGE_STRUCTURE> that is lined by an impermeable <MATERIAL> and surrounded with <SOIL>; a storage pit. | 1172 |
| STORAGE_STRUCTURE | A <STRUCTURE> intended for storing <MATERIAL>s or products; a storage structure. | 1173 |
| STORAGE_TANK | A <CONTAINER> used for the storage of liquids or gases; a storage tank. | 1174 |
| STRATOPAUSE | The top of the <TEMPERATURE_INVERSION_LAYER>, if it exists, that form the upper limit of the <STRATOSPHERE>; the stratopause. | 1175 |
| STRATOSPHERE | The <ATMOSPHERE_REGION> of the <EARTH> extending from the <TROPOPAUSE> to the <STRATOPAUSE> in which the <<AIR_TEMPERATURE>> generally increases with <<HEIGHT_AGL>>; the stratosphere. | 1176 |
| STREET | A <ROAD> in a <BUILT_UP_REGION>; a street. | 1177 |
| STREET_LAMP | A <LIGHT>, generally located on a <POLE>, that illuminates a <ROAD> or a <SIDEWALK>; a street lamp [SOED, "street lamp"] or street-light. | 1178 |
| STRUCTURAL_PILE | A <STRUCTURE> consisting of a long, heavy timber or section of steel or concrete that is forced into the <TERRAIN> to serve as a support (for example: for a <PIER>); a piling or structural pile. | 1179 |
| STRUCTURE | A combination of <COMPONENT>s that are fabricated and interconnected in accordance with a design; a structure. | 1180 |
| STRUCTURE_ENTRANCE | A way into a <STRUCTURE>; an entrance [SOED, "entrance", 4]. EXAMPLES <GATE>, <HALLWAY>, <DOOR>. |
1181 |
| STRUCTURE_ENTRANCE_AND_OR_EXIT | A way into, out of, or both into and out of a <STRUCTURE>; an entrance and/or an exit. EXAMPLES <GATE>, <HALLWAY>, <DOOR>. |
1182 |
| STRUCTURE_EXIT | A way out of a <STRUCTURE>; an exit [SOED, "exit", 3]. EXAMPLES <GATE>, <HALLWAY>, <DOOR>. |
1183 |
| STRUCTURE_EXTERIOR | The <NON_EMPTY_SET> of <EXTERIOR_WALL>s and <ROOF> (if present) of a <STRUCTURE>. | 1184 |
| STRUCTURE_PERIMETER | The perimeter of a <STRUCTURE>. | 1185 |
| STUPA | A round, usually dome-shaped, Buddhist <SHRINE> topped with a cupola; a stupa [SOED, "stupa"]. | 1186 |
| SUBMERGED_ROCK_FORMATION | An isolated formation of <ROCK> or a single large <ROCK> that is located in a <WATERBODY> and is typically submerged but possibly projects above the <WATERBODY_SURFACE>. | 1187 |
| SUBMERSIBLE_VESSEL | A <VESSEL> capable of operation either on a <WATERBODY_SURFACE> or beneath it; a submersible vessel. | 1188 |
| SUGAR_CANE | A <TRACT> of Saccharum officinarum; sugar cane [AHD, "sugar cane"]. | 1189 |
| SUN | The central <STAR> of the <SOLAR_SYSTEM> containing the <EARTH>; the Sun. | 1190 |
| SUNSPOT | A relatively cool and dark appearing <REGION> on the photosphere of the <SUN>; a sunspot. | 1191 |
| SUPERSTRUCTURE | A substantial <STRUCTURE> resting on something else; a superstructure [SOED, "superstructure", 1]. | 1192 |
| SUPPLIES_AND_EXPENDABLES | A <NON_EMPTY_SET> of <EQUIPMENT> and/or <MATERIAL> that may be consumed or discarded after use; supplies and expendables. | 1193 |
| SURF | The belt of nearly continuous, breaking <WATER_WAVE>s along a <SHORE> or over a submerged bank or <SAND_BAR>; surf. | 1194 |
| SURF_ZONE | The <REGION> between the outermost limit of <SURF> and the resulting limit of <WATER_WAVE> uprush on a <SHORE>; a surf zone. | 1195 |
| SURFACE | An outermost, limiting <COMPONENT> of an <OBJECT> that is immediately adjacent to another <OBJECT> (for example: an <ATMOSPHERE> and/or <SPACE>); a surface [SOED, "surface", 1.a]. | 1196 |
| SURFACE_BASED_EM_DUCT | A layer of the <ATMOSPHERE> that is adjacent to the <PLANETARY_SURFACE> of the <EARTH> and in which electromagnetic waves are trapped due to changes in the index of refraction; a surface-based electromagnetic duct. | 1197 |
| SURFACE_DATUM | A <DATUM> defining a <SURFACE> from which elevations or depths are measured. EXAMPLES <VERTICAL_DATUM>, <SOUNDING_DATUM>. |
1198 |
| SURFACE_FISSURE | A narrow fissure, crack, and/or rift in the <TERRAIN> or the overlying <SNOW_GROUND_COVER> or <ICE>; a surface fissure. | 1199 |
| SURVEILLANCE_WINGED_AIRCRAFT | A winged <AIRCRAFT> designed or designated for surveillance missions. | 1200 |
| SURVEY_MARKER | A <TERRAIN_SURFACE_OBJECT> (for example: a <MARKER>) with a known <LOCATION>; a survey marker. | 1201 |
| SWAMP | A seasonally flooded, low-lying <WETLAND> with more woody <PLANT>s than a <MARSH> and better drainage than a <BOG>; a swamp [AHD, "swamp", 1a]. | 1202 |
| SWELL_WAVE | A surface gravity <WATER_WAVE> that is not growing or being sustained any longer by the <WIND> but that was generated by the <WIND> some distance away and is now propagating freely across the <WATERBODY_SURFACE> away from its <REGION> of generation; a swell wave. | 1203 |
| SWEPT_REGION | A <WATERBODY_REGION> that has been determined to be clear of navigational dangers to a specified depth; a swept region. | 1204 |
| SWIMMING_POOL | A constructed pool used for swimming; a swimming pool [SOED, "swimming pool"]. | 1205 |
| SYNAGOGUE | A <WORSHIP_PLACE> for Jewish worship and religious instruction; a synagogue. | 1206 |
| SYSTEM | A <NON_EMPTY_SET> of <OBJECT>s arranged or organized for a special purpose and functioning together as a whole; a system [SOED, "system", 3]. | 1207 |
| SYSTEMATIC_TREE_PLANTING | A <TRACT> covered by systematic plantings of <TREE>s that yield a product (for example: a fruit and/or a nut). | 1208 |
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