TRISHNA Mission: Tracking Earth’s Heat from Space

The satellite is designed to help scientists monitor Earth’s surface temperature, understand water consumption, assess vegetation health, and improve the management of natural resources. With climate change and water scarcity becoming increasingly important global challenges, TRISHNA could provide valuable data for more sustainable resource management.

TRISHNA is a joint satellite mission being developed by the Indian Space Research Organisation (ISRO) and France’s space agency, the Centre National d’Études Spatiales (CNES).

Its primary goal is to observe the Earth’s surface using advanced infrared imaging technology. The satellite will collect detailed information about surface temperature, vegetation conditions, and water-related processes.

Unlike conventional Earth-observation satellites that may not capture all these details at the required frequency, TRISHNA is designed to provide high spatial and high temporal resolution data.

In simple terms, this means the satellite aims to capture detailed images of the Earth and revisit areas frequently enough to track environmental changes over time.

Water is essential for agriculture, industries, ecosystems, and everyday life. However, managing water efficiently requires accurate information about where it is being used, how much is being lost, and how environmental conditions are changing.

TRISHNA aims to address these challenges by providing detailed observations of the Earth's surface temperature and related environmental parameters.

Its data could support several important applications:

• Agriculture: Monitoring crop conditions and identifying areas experiencing water stress.
• Irrigation management: Helping assess irrigation requirements and improve water-use efficiency.
• Drought monitoring: Identifying environmental conditions associated with water scarcity.
• Vegetation health: Tracking changes in plant growth and ecosystem conditions.
• Climate research: Studying land-surface temperature patterns and their relationship with the environment.
• Natural resource management: Supporting better planning and sustainable use of land and water resources.

These applications could help researchers and policymakers make more informed decisions about agriculture, water conservation, and environmental protection.

TRISHNA will use advanced infrared imaging systems to study the Earth's surface. Its observations will help scientists understand how land and vegetation interact with energy and water.

The mission is designed to measure surface temperature, surface emissivity, and other biophysical and radiation-related variables. These measurements will contribute to surface energy budgeting, which helps scientists understand how energy is exchanged between the Earth's surface and the atmosphere.

For example, land covered with healthy vegetation may behave differently from dry or sparsely vegetated land. By observing these differences, scientists can better understand environmental conditions and changes in water availability.

The satellite will carry two major scientific payloads, developed through cooperation between ISRO and CNES.

Together, the two payloads are expected to provide complementary information for a more comprehensive understanding of the Earth's surface. The satellite is planned to be launched aboard India's Polar Satellite Launch Vehicle (PSLV).

TRISHNA represents another major step in the longstanding space partnership between India and France.

Before TRISHNA, the two countries collaborated on important satellite missions, including:

• Megha-Tropiques: A mission focused on studying the water cycle and energy exchanges in the tropical atmosphere.
• SARAL (Satellite with ARGOS and ALTIKA): A joint mission designed to improve oceanographic observations, including measurements of sea-surface height.

  TRISHNA continues this partnership by focusing on land-surface temperature, vegetation, and water-related environmental processes.

  The collaboration brings together India's satellite engineering and launch capabilities with France's expertise in thermal infrared observation, creating opportunities for scientific research and technological advancement.

Another important feature of the mission is its proposed open data policy.

According to Nagalakshmi A.M., Project Director of TRISHNA, scientific data generated by the mission will be disseminated globally.

This means that researchers and the wider scientific community are expected to benefit from the mission's observations, supporting studies on climate, agriculture, water resources, and environmental change.

The availability of such data could strengthen international research collaboration and help scientists develop better tools for monitoring the Earth's changing environment.

TRISHNA is important not only because it strengthens India-France space cooperation but also because it addresses practical environmental challenges.

Its high-resolution observations could help improve understanding of agricultural water use, vegetation stress, land-surface temperature, and regional environmental changes.

As water scarcity and climate variability place increasing pressure on natural resources, satellite-based monitoring can provide valuable evidence for planning and policymaking.

However, the mission's actual impact will depend on the quality, availability, and effective use of its scientific data after launch.

The TRISHNA satellite mission is a significant upcoming development in India's Earth observation program. Jointly developed by ISRO and France's CNES, the mission aims to provide detailed information about the Earth's surface temperature, vegetation, and water-related processes.

With a launch expected in the next 12–16 months from October 2026, TRISHNA could become an important tool for agricultural monitoring, water management, climate research, and sustainable development.

Beyond its scientific objectives, the mission highlights how international space cooperation can contribute to addressing some of the world's most pressing environmental challenges.