Which of the following best explains the evolving strategic and technological significance of Earth Observation Satellites (EOS) in India's space program, and how they differ from traditional remote sensing systems?
Show answer & explanation
Correct answer: C
Explanation
Solution: The correct answer is EOS in India form an integrated constellation for real-time, high-resolution monitoring of weather, agriculture, disasters, and strategic assets using synthetic aperture radar and multi-spectral imaging, offering higher revisit capability and data fusion compared to traditional remote sensing satellites.
Explanation:
☛ Earth Observation Satellites (EOS): The Indian Space Research Organisation (ISRO) adopted a unified nomenclature (EOS series) moving away from theme-specific designations such as IRS, Cartosat, Resourcesat, and RISAT.
☛ Advanced Payloads: Modern EOS platforms utilize sophisticated payloads including Synthetic Aperture Radar (SAR) for all-weather, day-and-night imaging, as well as multi-spectral and hyperspectral sensors.
☛ Strategic and Civil Data Fusion: Unlike earlier single-application remote sensing satellites, the modern EOS constellation delivers rapid revisit rates, real-time data streaming, and cross-sensor data fusion to support both civilian governance (agriculture, flood monitoring) and national security surveillance.
Extra Exam-Relevant Facts:
☛ EOS-01: Launched in November 2020 aboard the PSLV-C49, serving as a radar imaging satellite for agriculture, forestry, and disaster response.
☛ EOS-04: Formerly designated as RISAT-1A, it was launched in February 2022 via PSLV-C52 carrying a C-band SAR system.
☛ EOS-06 (Oceansat-3): Launched in November 2022 via PSLV-C54 to monitor ocean color, sea surface temperature, and wind vectors.
☛ EOS-07: Successfully placed into orbit in February 2023 during the developmental flight of SSLV-D2.
☛ NISAR: A landmark collaborative Earth observation mission between NASA and ISRO utilizing dual-frequency (L-band and S-band) radar.
Important One-Liners for Upcoming Exams:
☛ Which was India's first operational remote sensing satellite launched in 1988? → IRS-1A
☛ Where is the National Remote Sensing Centre (NRSC) of ISRO headquartered? → Hyderabad, Telangana
☛ What technology enables Earth observation satellites to capture imagery through clouds and at night? → Synthetic Aperture Radar (SAR)
☛ Which Indian satellite series was primarily developed for high-resolution cartographic applications? → Cartosat
☛ Which joint Earth-observation satellite is being developed by NASA and ISRO? → NISAR