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• SensorThings API

• Scintillometer

• SEBAC

• Sensible Heat Flux

• Satellite Missions

• Space Science

• Space Technologies

• Space Technologies for Water Management

• Satellite Technology

• Security

• Space Law

• Space History

• Space Governance

• Space Law Treaties

• Satellite Subsystem

• Spacecraft Power

• Satellite Navigation

• Science Payload

• Satellite Characteristics

• Swath

• Spectral Signature

• Synthetic Aperture Radar (SAR)

• Scatterometer

• Sounder

• Sounder (passive)

• Spectrometer

• Spectroradiometer

• Spatial Resolution

• Spectral Resolution

• Spectral Index

• Soil-Adjusted Vegetation Index (SAVI)

• Sub-Pixel-Based Classification

• Space Station

• Sun-Synchronous Orbit

• Space Exploration

• Spatial Data

• Space Spin-Off Technology

• Spin-Off: Biomedical Sensor Suit

• Spin-Off: Solar Cell

• Spin-Off: Memory Foam

• Spin-Off: Water Filtration System

• Space Law Principles

• Space Physics

• Spectral

• Shortwave-Infrared (SWIR)

• Space Environment

• Spectral Band

• Standardized Precipitation Index (SPI)

• Surface Energy Balance Algorithm for Land (SEBAL)

• Space Architecture

• Space Actor

• SUPARCO

• SANSA

• SSAU

• Soil Moisture Active Passive (SMAP)

• Saline water

• Salinity

• Salt water encroachment

• Saltwater wedge

• Sediment

• Sedimentation

• Settling

• Stratification

• Sheet flow

• Surface flow

• Station

• Surface runoff

• Slope (of water surface)

• Snow hydrology

• Sleet

• Snow density

• Spill

• Stream

• Streamflow

• Static water level

• Surface water temperature

• Semi-confined aquifer

• Saturated zone

• Soil moisture

• Salination

• Storage

• Streamflow characteristics

• Solubility

• Solute

• Sublimation

• Standardization

• Satellite Constellation

• Solid Rocket Engine / Motor / Booster (SRB)

• Staged Combustion

• Sub-cooled Propellants

• Solar Sail

• Solar Panels / Cells

• Structure

• Satellite-based Precipitation Estimation

• Satellite Imagery

• Systems Science

• Sanitary Engineering

• Sanitation

• Soil Media

• Shuttle Radar Topography Mission (SRTM)

• Soil Moisture and Ocean Salinity (SMOS)

• Social

• Segmentation

• Sedimentary cycles

• Sulphur cycle

• Solvent

• Steady flow

• Specific permeability

• Soil

• Science, Technology, Engineering, and Mathematics (STEM)

• Surface water storage

• Spring

• Surface water

• Sea Surface Temperature (SST)

• Storm surge

• Satellite Altimetry

• Subsidence

• Sinkhole

• Snow Cover

• Sewage

• Stratosphere

• Surface Water and Ocean Topography

• Standardized Soil Moisture Index (SSI)

• Surface Energy Balance System

• Soil electrical conductivity

• Surface current velocity

• Soil dielectric constant

• Shallow waters

• Satellite Communication

• Snowpack

• Snowmelt

• Stormwater (Urban) Runoff

• Streamflow to closed basins

• Streamflow to ocean

• Surface mass

• Surface water extent

• Snow contamination

• Saltwater intrusion

• Seasonal Human Population Models

• SSP2-4.5

• SSP5-8.5

• Sentinel-6

• Sea-level rise