News: TRISHNA is a joint Indo-French Earth-observation mission being developed by ISRO + CNES for high-resolution monitoring of Earth’s surface.

About TRISHNA

• Full form: Thermal Infra-Red Imaging Satellite for High-resolution Natural Resource Assessment.
• Agencies: ISRO + CNES
• Launch vehicle: PSLV.
• Orbit: Sun-synchronous, ~761 km altitude.
• Mission life: 5 years.

Key Objectives

• Water & energy → Monitor water stress + terrestrial water use + energy budgets.
• Agriculture → Support crop monitoring, drought assessment + irrigation management.
• Water bodies → Monitor water quality and dynamics of lakes, rivers, reservoirs + coastal ecosystems.
• Urban heat → Detect Urban Heat Islands (UHIs) and thermal anomalies.
• Snow & glaciers → Monitor glacier dynamics + snow-melt runoff.
• Atmosphere → Provide data on aerosols + water vapour + clouds.

Major Payloads

• TIR payload → Developed by CNES; 4-channel long-wave infrared sensor → surface temperature + emissivity.
• VNIR-SWIR payload → Developed by ISRO; 7 spectral bands → surface reflectance + vegetation/biophysical parameters.

Key Specifications

• Spatial resolution: 57 m → land & coastal areas; 1 km → oceanic & polar regions.
• Global applications → GEOGLAM + Global Water Watch + UN SDGs.
• Data contributes to Essential Agricultural Variables (EAVs) + Essential Climate Variables (ECVs).

Significance

TRISHNA → high-resolution thermal observations → better water-resource management + agriculture + climate monitoring + disaster/environmental assessment.