Alphabetical listing of categories: S

S -> sulfur (1) aviation safety (4) human environmental safety (10) safety issues (human) -> human environmental safety (10) sales and distribution services (15) ocean salinity (2) salinity (11) salt-water intrusion -> saltwater intrusion (6) salt deposit areas -> mineral deposit areas (76) salt evaporation ponds -> lakes (33) intermittent salt lakes -> lakes (33) salt lakes -> lakes (33) salt marshes -> wetlands (38) salt mines -> mine sites (15) intermittent salt ponds -> lakes (33) salt ponds -> lakes (33) saltwater intrusion (6) samarium (5) sample collections -> sample repositories (1) sample repositories (1) standard reference samples -> materials standards (3) core sampling -> drilling and coring (20) field sampling (139) ice core sampling (1) -> snow and ice cover WITH drilling and coring plot sampling (2) transect sampling (1) water sampling (50) sanatariums -> medical facilities (2) sanatoriums -> medical facilities (2) sanctuaries (wildlife) -> reserves (5) sandbars -> bars (physiographic) (2) sand deposits (4) sandy areas -> beaches (11) sandy deserts -> deserts (10) sanitary landfills -> disposal sites (2) SAR interferometry -> IFSAR (4) satellite altimetry (2) -> altimetry measurement WITH remote sensing satellite images (25) -> image collections WITH remote sensing satellite imaging -> remote sensing (108) satellite photography -> visible light imaging (4) satellite stations -> data collection facilities (1) savannahs -> grasslands (10) savannas -> grasslands (10) sawmills -> industrial sites (2) Sb -> antimony (1) Sc -> scandium (1) geologic time scales (6) scandium (1) scanning electron microscopy (2) scenic areas -> parks (14) careers in science -> scientific careers (8) computer science (4) science centers (53) science discipline offices (3) Earth Science Information Centers (ESICs) -> reference services (4) science programs (116) atmospheric sciences (43) biological sciences -> life sciences (417) earth sciences (1218) engineering sciences (25) geographic information sciences -> geography (155) information sciences (15) life sciences (417) ocean sciences (51) planetary sciences (7) sciences (1543) social sciences (5) soil sciences (5) chemistry (Earth sciences) -> geochemistry (156) chemistry (life sciences) -> biochemistry (10) science strategy -> strategic plans (5) scientific careers (8) improvement of scientific data usability (1) scientific reports -> reports (105) scientific research bases -> research facilities (4) scientific software (29) scientists-at-work photographs (2) -> scientific careers WITH image collections false scorpions -> arachnids (1) bridge scour -> scour (2) scour (2) scrap yards -> disposal sites (2) scrubland ecosystems -> shrubland ecosystems (5) scrublands -> shrublands (2) Se -> selenium (3) sea-floor characteristics (37) sea-ice concentration -> sea ice concentration (3) sea-level change (11) sea-level rise -> sea-level change (11) sea-surface temperature -> sea surface temperature (10) sea anemones -> coelenterates (14) seachannels (seafloor) -> seafloor features (15) deep sea fisheries -> marine fishery resources (3) deep sea fishing -> marine fishery resources (3) seafloor characteristics -> sea-floor characteristics (37) sea floor characteristics -> sea-floor characteristics (37) seafloor features (15) sea floor topography -> bathymetry (25) seagrass -> aquatic vegetation (3) sea ice concentration (3) sea ice cover -> sea ice concentration (3) search engines -> search services (11) search services (11) inland seas -> lakes (33) seas (10) national seashores -> parks (14) seasonal migration -> migration (organisms) (4) sea squirts -> tunicates (2) sea surface temperature (10) seawalls -> breakwaters (3) seaweeds -> aquatic vegetation (3) second-order administrative divisions -> countries, 2nd order divisions (1) geologic sections -> stratigraphic sections (27) hydrographic sections -> hydrogeology (37) stratigraphic sections (27) sections (geologic) -> stratigraphic sections (27) sections (stratigraphic) -> stratigraphic sections (27) sedimentary rocks (12) alluvial sedimentation -> sedimentation (30) sedimentation (30) sediment geochemistry (4) -> unconsolidated deposits WITH chemical analysis sedimentology (19) eolian sediments -> unconsolidated deposits (20) sediments -> unconsolidated deposits (20) estuarine sediment transport (1) -> sediment transport WITH estuarine processes marine sediment transport (13) -> ocean processes WITH sediment transport sediment transport (46) segmented worms (1) seismic activity -> earthquake occurrences (42) seismic exploration (1) -> seismic methods WITH natural resource exploration seismic hazard maps (14) -> maps and atlases WITH earthquake occurrences seismic imaging -> seismic methods (44) seismicity -> earthquake occurrences (42) seismicity maps (7) -> earthquake probabilities WITH maps and atlases seismic methods (44) seismic monitoring stations -> field monitoring stations (2) seismic networking (16) seismic profiles -> seismic methods (44) seismic reflection method (7) seismic reflection survey maps (2) -> seismic reflection method WITH maps and atlases seismic refraction method (6) seismic tomography -> tomography (1) seismograms -> seismic methods (44) earthquake seismology (31) -> seismology WITH earthquake occurrences engineering seismology (4) -> seismology WITH engineering sciences seismology (60) seismometry -> seismic methods (44) selenium (3) semi-independent political entities -> political areas (1) optical backscatterance sensing -> optical methods (3) remote sensing (108) space-borne sensing -> remote sensing (108) Special Sensor Microwave/Imager (SSM/I) -> SSM/I (1) gas-oil separation plants -> industrial sites (2) DNA sequencing (8) gene sequencing -> DNA sequencing (8) carbon sequestration (6) serial publications -> reports (105) published series -> reports (105) time series analysis (3) time series datasets (6) lanthanide series elements (1) map servers -> map interfaces (27) web service development (1) data services (28) ecosystem services -> ecosystem functions (15) educational services (14) GIS services -> web map services (6) information services (88) news services (6) reference services (4) sales and distribution services (15) search services (11) user services (114) web map services (6) settlements -> populated places (7) sewage disposal -> waste treatment and disposal (22) sewage treatment plants -> waterworks (1) sexing (plants & animals) (3) sexing (plants and animals) -> sexing (plants & animals) (3) mine shafts -> mine sites (15) shaking maps (seismic) (14) -> maps and atlases WITH earthquake occurrences oil shale resources (6) sheepfolds -> agricultural sites (5) ice sheets -> ice masses (8) sheikdoms -> administrative areas (8) shelf edges (ocean) -> continental margins (11) shelf valleys (seafloor) -> seafloor features (15) shellfish (3) animal shelters -> buildings (12) shelters -> buildings (12) continental shelves -> continental margins (11) shelves, continental -> continental margins (11) ship tracks -> transportation features (4) shoals -> bars (physiographic) (2) shopping centers -> commercial sites (2) shopping malls -> commercial sites (2) shops -> buildings (12) shorebirds -> birds (70) shoreline erosion (28) -> erosion WITH coastal processes shoreline retreat (28) -> erosion WITH coastal processes shorelines -> coastal zones (76) shores -> coastal zones (76) short grass ecosystems -> grassland ecosystems (15) shrines -> monuments (2) shrubland ecosystems (5) shrublands (2) side-scan sonar methods (21) Sidescan sonar methods -> side-scan sonar methods (21) sierra -> mountain ranges (2) silver (1) mathematical simulation (19) sinkhole formation (2) sinkholes -> physiographic features (214) sinks -> physiographic features (214) siphon (physiographic) -> physiographic features (214) sisal plantations -> agricultural sites (5) agricultural sites (5) commercial sites (2) dam sites (8) disposal sites (2) ecological research sites (2) highway maintenance sites -> transportation features (4) industrial sites (2) institutional sites (2) mill sites -> industrial sites (2) mine sites (15) observation sites -> research areas (3) parking sites (1) pastoral sites -> agricultural sites (5) refuse disposal sites -> disposal sites (2) test sites -> research areas (3) waste disposal sites -> disposal sites (2) adits (mine sites) -> mine sites (15) reservations (nature sites) -> reserves (5) slag heaps -> disposal sites (2) slides (land) -> landslides (27) slides (natural) -> physiographic features (214) continental slopes -> continental margins (11) slopes -> physiographic features (214) talus slopes -> physiographic features (214) slope stability -> landslide susceptibility assessment (7) slope stability maps (2) -> maps and atlases WITH landslide susceptibility assessment sloughs -> wetlands (38) slues -> wetlands (38) sluices -> hydrographic structures (33) slumps -> mass wasting (29) Sm -> samarium (5) smelters -> industrial sites (2) Sn -> tin (2) acid snow -> acid deposition (6) snow -> precipitation (atmospheric) (32) snow and ice cover (20) snowfall -> precipitation (atmospheric) (32) snowfall measurement (10) -> precipitation (atmospheric) WITH field inventory and monitoring snowpack -> snow and ice cover (20) social sciences (5) socioeconomics -> culture and demographics (27) scientific software (29) software development (1) soil chemistry (4) soil formation (3) soil pollution (1) -> soil resources WITH contamination and pollution soil resources (8) soil sciences (5) sonar depth-sounding -> sonar methods (27) side-scan sonar methods (21) Sidescan sonar methods -> side-scan sonar methods (21) sonar methods (27) echo sounding -> sonar methods (27) magnetotelluric sounding -> electromagnetic surveying (11) resistivity sounding -> electrical resistivity logging (2) sound recordings (4) sounds (bodies of water) -> channels (4) energy sources -> energy resources (127) space-borne sensing -> remote sensing (108) advanced spaceborne thermal emission and reflection radiometer -> multispectral imaging (21) space centers -> research facilities (4) spatial analysis (25) Special Sensor Microwave/Imager (SSM/I) -> SSM/I (1) alien species -> nonindigenous species (49) distribution of species -> biogeography (69) endangered species (22) endemic species (2) exotic species -> nonindigenous species (49) foreign species -> nonindigenous species (49) indigenous species -> native species (5) introduced species -> nonindigenous species (49) invader species -> invasive species (27) invasive species (27) keystone species (2) migratory species (18) native species (5) non-indigenous species -> nonindigenous species (49) non-native species -> nonindigenous species (49) nonindigenous species (49) nuisance species (2) species distribution -> biogeography (69) species distribution maps (12) -> maps and atlases WITH biogeography species diversity (5) species geographic range -> biogeography (69) indicator species observation -> ecosystem monitoring (65) specimen collecting (20) collection of specimens -> specimen collecting (20) airborne visible infrared imaging spectrometer -> AVIRIS (3) gamma-ray spectrometric surveying -> aeroradiometric surveying (1) inductively coupled plasma-atomic emission spectrometry -> atomic emission spectroscopy (4) mass spectrometry -> mass spectroscopy (7) Moderate-resolution imaging spectroradiometer -> multispectral imaging (21) atomic emission spectroscopy (4) hand-held field spectroscopy -> handheld field spectroscopy (1) handheld field spectroscopy (1) mass spectroscopy (7) nuclear magnetic resonance spectroscopy -> chemical analysis (55) particle-beam spectroscopy (1) speeches and testimony (1) speleology -> geomorphology (42) spiders -> arachnids (1) oil spills (10) -> industrial pollution WITH petroleum spillways -> dam sites (8) spits -> bars (physiographic) (2) sponges (2) sport fishing -> recreational fishery resources (1) spring ecosystems -> freshwater ecosystems (26) hot springs -> thermal features (6) mineral springs -> springs (hydrographic) (2) sulfur springs -> springs (hydrographic) (2) springs (hydrographic) (2) village squares -> parks (14) sea squirts -> tunicates (2) Sr -> strontium (1) SSM/I (1) SSM/I images -> SSM/I (1) sst -> sea surface temperature (10) slope stability -> landslide susceptibility assessment (7) slope stability maps -> maps and atlases (219) light stable-isotope analysis -> light stable isotope analysis (14) light stable isotope analysis (14) stable isotope analysis -> light stable isotope analysis (14) bankfull stage -> floods (57) flood stage -> streamflow (148) stream stage -> streamflow (148) standard reference samples -> materials standards (3) materials standards (3) standards (10) standards development (8) state forests -> parks (14) state parks -> parks (14) freely associated states -> political areas (1) United States Government establishments -> buildings (12) bailing stations -> agricultural sites (5) coast guard stations -> buildings (12) experiment stations -> research facilities (4) field monitoring stations (2) field stations -> field monitoring stations (2) fire stations -> buildings (12) forest stations -> buildings (12) gaging stations (6) guard stations -> buildings (12) inspection stations -> buildings (12) meteorological stations -> data collection facilities (1) ranger stations -> buildings (12) satellite stations -> data collection facilities (1) seismic monitoring stations -> field monitoring stations (2) stations -> buildings (12) stream gaging stations -> field monitoring stations (2) weather stations -> research facilities (4) whaling stations -> industrial sites (2) statistical analysis (19) statistical surveying (1) statues -> monuments (2) statutes -> laws and regulations (2) stock routes -> transportation features (4) stockyards -> agricultural sites (5) crushed stone -> building stone resources (4) dimension stone -> building stone resources (4) building stone resources (4) stony deserts -> deserts (10) storage fields (petroleum) -> oil fields (1) stores -> commercial sites (2) geomagnetic storms -> magnetic storms (4) magnetic storms (4) storms (40) storm surge (8) stormwater runoff -> runoff (11) strain history -> deformation (geologic) (10) straits -> channels (4) strands -> beaches (11) strategic plans (5) science strategy -> strategic plans (5) stratigraphic sections (27) stratigraphy (8) stream-flow monitoring -> stream-gage measurement (129) stream-gage measurement (129) stream-gage monitoring -> stream-gage measurement (129) dry stream beds -> streams (85) stream bends -> streams (85) stream current -> streamflow (148) stream current monitoring -> stream-gage measurement (129) stream discharge (15) stream discharge monitoring -> stream discharge (15) stream ecosystems -> freshwater ecosystems (26) stream flow -> streamflow (148) streamflow (148) streamflow data (81) -> streamflow WITH datasets streamflow modeling (23) -> streamflow WITH mathematical modeling streamflow monitoring -> stream-gage measurement (129) stream flow monitoring -> stream-gage measurement (129) stream gage monitoring -> stream-gage measurement (129) stream gaging stations -> field monitoring stations (2) stream mouths -> streams (85) intermittent streams -> streams (85) streams (85) stream stage -> streamflow (148) streets -> roadways (2) strike-slip faults -> faults (16) strip mines -> mine sites (15) strong motion -> earthquake occurrences (42) strontium (1) structural geology (7) earth structure (13) geologic structure (34) organizational structure (66) structure contours (2) hydrographic structures (33) structures -> buildings (12) institutional structures and activities (335) student unions -> buildings (12) studios -> buildings (12) isotopic tracer study -> tracer study (3) radioisotope tracer study -> tracer study (3) tracer study (3) study areas -> research areas (3) sub-surface dams -> dam sites (8) subbituminous coal resources -> coal resources (13) subduction -> tectonic processes (20) submarine canyons (1) subsea features -> seafloor features (15) subsidence (9) substations -> buildings (12) water subsurface -> groundwater (190) subsurface maps (93) -> maps and atlases WITH geology suburbs -> populated places (7) ecologic succession -> succession (biological) (1) succession (biological) (1) sugar mills -> industrial sites (2) sugar plantations -> agricultural sites (5) sugar refineries -> industrial sites (2) sulfur (1) sulfur springs -> springs (hydrographic) (2) sultanates -> administrative areas (8) mountain summits (1) summits -> mountain summits (1) public water supply -> domestic water use (10) water supply and demand (79) external research support (4) product support -> customer support and user feedback (4) technical support -> customer support and user feedback (4) customer support and user feedback (4) decision support methods (12) support offices (2) potentiometric surface -> groundwater level (24) temperature (sea surface) -> sea surface temperature (10) surface-water/ground-water interaction -> groundwater and surface-water interaction (4) groundwater and surface-water interaction (4) surface-water level (7) land surface characteristics (54) sea surface temperature (10) surface water (non-marine) (175) surface water/groundwater interaction -> groundwater and surface-water interaction (4) surface water quality (53) surficial deposits -> unconsolidated deposits (20) surficial geologic maps (15) -> surficial geologic units WITH maps and atlases surficial geologic units (18) storm surge (8) aeromagnetic surveying (10) aeroradiometric surveying (1) electromagnetic surveying (11) gamma-ray spectrometric surveying -> aeroradiometric surveying (1) land surveying (4) magnetic surveying (4) -> aeromagnetic surveying WITH electromagnetic surveying statistical surveying (1) surveying -> land surveying (4) seismic reflection survey maps -> seismic reflection method (7) geochemical surveys -> chemical analysis (55) magnetic susceptibility analysis (2) landslide susceptibility assessment (7) landslide susceptibility maps (2) -> landslide susceptibility assessment WITH maps and atlases suspended load -> sediment transport (46) suspended material (water) (16) mangrove swamps -> wetlands (38) swamps -> wetlands (38) symbiosis (1) white-nose syndrome -> wildlife disease (19) Interferometric Synthetic Aperture Radar (IFSAR) -> IFSAR (4) geographic information system (GIS) datasets -> geospatial datasets (115) systematics and taxonomy (15) information system design and development (41) knowledge organization system development (2) coordinate systems -> map coordinate systems (3) early warning systems -> hazard preparedness (60) geographic coordinate systems -> map coordinate systems (3) grid coordinate systems -> map coordinate systems (3) land partitioning systems -> cadastral and legal land descriptions (1) map coordinate systems (3) river systems (33) geographic information systems (GIS) (23)

Alphabetical index of categories: S