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EARTH REMOTE SENSING INSTRUMENTS > PASSIVE REMOTE SENSING > POSITIONING/NAVIGATION
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EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS
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EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOMASS DYNAMICS
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EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS
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EARTH SCIENCE > BIOSPHERE > TERRESTRIAL ECOSYSTEMS > ALPINE/TUNDRA
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EARTH SCIENCE > BIOSPHERE > VEGETATION > BIOMASS
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EARTH SCIENCE > BIOSPHERE > VEGETATION > CARBON
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EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION COVER
EARTH SCIENCE > BIOSPHERE > VEGETATION > VEGETATION SPECIES
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EARTH SCIENCE > CLIMATE INDICATORS > CRYOSPHERIC INDICATORS > ICE DEPTH/THICKNESS
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EARTH SCIENCE > CLIMATE INDICATORS > TERRESTRIAL HYDROSPHERE INDICATORS > PERMAFROST MELT
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EARTH SCIENCE > CRYOSPHERE > FROZEN GROUND > ACTIVE LAYER
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EARTH SCIENCE > CRYOSPHERE > FROZEN GROUND > PERMAFROST
EARTH SCIENCE > HUMAN DIMENSIONS > INFRASTRUCTURE
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EARTH SCIENCE > LAND SURFACE > LAND USE/LAND COVER
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EARTH SCIENCE > LAND SURFACE > SOILS > SOIL CHEMISTRY
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EARTH SCIENCE > LAND SURFACE > SOILS > SOIL COLOR
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EARTH SCIENCE > LAND SURFACE > SOILS > SOIL DEPTH
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EARTH SCIENCE > LAND SURFACE > SOILS > SOIL MOISTURE/WATER CONTENT
EARTH SCIENCE > LAND SURFACE > SOILS > SOIL PH
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