| · TRISHNA (Thermal Infra-Red Imaging Satellite for High-Resolution Natural Resource Assessment) is a joint mission between ISRO (India) and CNES (France).
· Primary objectives – To monitor the energy and water budgets of the continental biosphere, quantifying terrestrial water stress and water use efficiency.
· It will also provide high-resolution observations of coastal and inland water quality dynamics.
Payloads – The satellite will carry two primary payloads.
· The Thermal Infra-Red (TIR)
· The Visible Near Infrared-Red Short Wave Infrared-Red (VNIR-SWIR)
· TIR payload will be provided by the French space agency CNES.
· It will be a four channel long-wavelength infrared imaging sensor that will study high-resolution surface temperature.
· It will also map the amounts of heat radiated back from land in different regions.
· VNIR-SWIR payload is being developed by ISRO. It will map over seven bands the reflectivity or albedo of earth’s surface.
· This will measure the amount of heat reflecting off the earth’s surface, and will also calculate various biophysical and radiation budget variables.
· Features – It has a unique combination of high spatial resolution (57m for land/coastal, 1km for ocean/polar) and frequent revisit time of just 2-3 days.
· This will enable unprecedented monitoring of key climate variables like surface temperatures, soil moisture, evapotranspiration rates, and vegetation health indicators.
· Orbit – It will operate from a sun-synchronous orbit at 761 km altitude, carrying two cutting-edge imaging payloads.
· Benefits – In agriculture, it will help optimize irrigation, improve crop productivity and enable sustainable water management practices.
· Urban planners will benefit from detailed urban heat island mapping, while water resource managers can monitor pollution in rivers, lakes and coastal areas.
· The mission will also support sectors like disaster management by detecting forest fires and volcanic activity.
· It acts as climate tracker by measuring key climate variables like evapotranspiration, snow/glacier dynamics and permafrost.
· Address crucial water and food security challenges, focusing on anthropogenic or human-induced impacts of climate change. |