ice -> snow and ice cover (1) icebergs -> ice masses (1) icecap depressions -> ice masses (1) icecap domes -> ice masses (1) icecaps -> ice masses (1) snow and ice cover (1) icefalls -> ice masses (1) ice fields -> ice masses (1) ice masses (1) ice patches -> ice masses (1) ice sheets -> ice masses (1) igneous rocks (80) image analysis (4) image collections (48) Landsat images (34) -> image collections -> multispectral imaging remote-sensing images (35) -> image collections -> remote sensing satellite images (35) -> image collections -> remote sensing airborne imaging -> remote sensing (246) hyperspectral imaging (8) infrared imaging (9) multispectral imaging (47) radar imaging (3) satellite imaging -> remote sensing (246) seismic imaging -> seismic methods (7) thermal imaging (3) visible light imaging (2) airborne visible infrared imaging spectrometer -> AVIRIS (3) Moderate-resolution imaging spectroradiometer -> multispectral imaging (47) environmental impact assessment -> environmental assessment (3) human impacts (53) impoundment -> water resource management (3) improvement of scientific data usability (1) incinerators -> disposal sites (7) geological long-range inclined asdic -> sidescan sonar (1) inclines -> physiographic features (401) catalogs and indexes (4) indexes -> catalogs and indexes (4) index fossils -> fossils (5) indian reservations -> tribal areas (1) indian reserves -> tribal areas (1) thermal indices -> thermal maturation (1) indium (97) inductively coupled plasma-atomic emission spectrometry -> atomic emission spectroscopy (149) industrial areas -> industrial sites (9) industrial mineral resources -> nonmetallic mineral resources (53) industrial minerals -> nonmetallic mineral resources (53) industrial parks -> industrial sites (9) industrial pollution (79) industrial sites (9) solid industrial waste material (4) industrial water use (1) inert gases -> noble gas elements (1) informatics activities -> information technology methods (9) information management -> data management (7) geographic information sciences -> geography (3) information sciences (1) information services (58) geographic information system (GIS) datasets -> geospatial datasets (883) information system administration (1) information system design and development (9) geographic information systems (6) geographic information systems (GIS) -> geographic information systems (6) information technology methods (9) infrared imaging (9) airborne visible infrared imaging spectrometer -> AVIRIS (3) infrared reflectance -> electromagnetic reflectance and emissivity (1) inland seas -> lakes (4) inns -> buildings (9) insects (1) inspection stations -> buildings (9) institutional structures and activities (71) technical instructions -> manuals (1) instrument design and development (4) aquifer-surface water interaction -> groundwater and surface-water interaction (7) ground-water/surface-water interaction -> groundwater and surface-water interaction (7) groundwater/surface water interaction -> groundwater and surface-water interaction (7) groundwater and surface-water interaction (7) surface-water/ground-water interaction -> groundwater and surface-water interaction (7) surface water/groundwater interaction -> groundwater and surface-water interaction (7) interagency programs (4) interdune troughs -> dunes (3) map interfaces (58) SAR interferometry -> IFSAR (1) interfluves -> plains (1) intermittent lakes -> lakes (4) intermittent oxbow lakes -> lakes (4) intermittent ponds -> lakes (4) intermittent pools -> lakes (4) intermittent reservoirs -> reservoirs (1) intermittent salt lakes -> lakes (4) intermittent salt ponds -> lakes (4) intermittent streams -> streams (7) intermittent wetlands -> wetlands (1) international programs (2) scientific interpretation (1) intersections -> roadways (1) interstices -> porosity (2) salt-water intrusion -> saltwater intrusion (1) saltwater intrusion (1) intrusive rocks -> plutonic rocks (32) inventory -> field inventory and monitoring (228) field inventory and monitoring (228) inverse modeling (1) inverse problem -> inverse modeling (1) geophysical inversion -> inverse modeling (1) inversion modeling -> inverse modeling (1) invertebrate paleontology (2) invertebrates (3) iodine (13) iridium (28) iron (165) iron mines -> mine sites (167) irridium -> iridium (28) isopach -> stratigraphic thickness (1) isopach maps (1) -> maps and atlases -> stratigraphic thickness isostatic anomaly (44) beryllium isotope analysis (1) carbon isotope analysis (4) light stable isotope analysis (20) oxygen isotope analysis (10) stable isotope analysis -> light stable isotope analysis (20) isotopic analysis (137) isotopic tracer study -> tracer study (7) safety issues (human) -> human environmental safety (3)