Why this matters now
Space applications are tested for satellite types, remote sensing/GIS, and how ISRO’s satellites serve development — the “space for governance” theme is a recurring GS-3 favourite.
Types of satellites
- Communication satellites (GSAT/INSAT) — telecom, TV, broadband, tele-education/medicine;
- Earth-observation / remote-sensing satellites (Cartosat, RISAT, Resourcesat) — imaging the Earth;
- Navigation satellites — NavIC (IRNSS) for positioning;
- Weather satellites (INSAT) — forecasting and cyclone tracking.
Remote sensing and GIS
Remote sensing is acquiring information about the Earth’s surface from satellites/aircraft without physical contact, using sensors across the electromagnetic spectrum. Combined with GIS (Geographic Information Systems) and GPS/NavIC, it enables spatial analysis for planning, resource mapping and monitoring.
Applications and benefits
Space applications support agriculture (crop & drought assessment), water and land-use mapping, forest/disaster monitoring, weather forecasting, fisheries, urban and infrastructure planning, and governance (PM Gati Shakti, SVAMITVA) — a powerful tool for evidence-based development and disaster response, delivered through ISRO and NRSC.
UPSC angle
Know satellite types (communication GSAT/INSAT, EO Cartosat/RISAT, navigation NavIC, weather INSAT), remote sensing + GIS + GPS, and applications in agriculture, disaster and governance.
Frequently asked questions
What is remote sensing?
Acquiring information about the Earth’s surface from satellites or aircraft without physical contact, using sensors across the electromagnetic spectrum.
What are the main types of satellites?
Communication, earth-observation/remote-sensing, navigation and weather satellites.
What is GIS?
A Geographic Information System — software that captures, stores and analyses spatial/geographic data, often combined with remote-sensing imagery.
How do space applications help development?
Through crop and drought assessment, resource mapping, disaster and weather monitoring, and governance tools like Gati Shakti and SVAMITVA.