| Designation | Scientist/Engineer - SC |
|---|---|
| Department | Geosciences Department |
| Field of Expertise | Feature extraction for opencast mine and crater boundary detection,working with optical, hyperspectral and SAR datasets for mineralogy, morphology, geological evolution modelling, pyroclastic deposit and source vent identification and characterisation, impact ejecta facies and their relation to radar-bright and radar-dark halos for Lunar craters |
| Mail Address | Geosciences Department, Indian Institute of Remote Sensing, ISRO, Govt of India, 4 Kalidas Road, Dehradun – 248 001, India |
- Worked with optical, hyperspectral, and SAR datasets for the Moon to analyze mineralogy, morphology, geological evolution models, and ejecta facies emplacement of lunar impact craters.
- Handled model simulation of the Quadrupole Mass Spectrometer payload for the Venus mission and worked with the Noble Gas Mass Spectrometer (NGMS) during a brief stint at PRL, Ahmedabad.
- Worked on Jharia Coal Field ground deformation mapping using InSAR and DInSAR techniques.
- Conducted studies on “Radar-dark halo” for Copernican-age craters, including mapping of impact ejecta facies, their relation to radar-bright and radar-dark halos, and characterization of Mean Circular Polarisation Ratio, Mean Backscatter Coefficient, and Mean Rock Abundance.
- Identified potential pyroclastic deposits and source vents using multi-frequency radar datasets, including Earth-based observations.
- Performed multi-frequency studies of lunar regolith properties, including mapping and analysis of emplacement mechanisms and physical properties of lunar regolith at selected sites.
- Developed preliminary algorithms for opencast mine detection and lunar crater boundary extraction, while working on advanced feature extraction methods applicable across multiple domains.
- Indian Society of Remote Sensing (ISRS) - Lifetime Member
- Dual Degree (B.Tech. in Engineering Physics + M.Tech. in Earth System Science) from Indian Institute of Space Science and Technology (IIST)
- Sci/Eng SC, Indian Institute of Remote Sensing (IIRS), Dehradun – Nov 2021 till date
- Sci/Eng SC, Physical Research Laboratory (PRL), Ahmedabad – Sept 2019 to Nov 2021
- Thesniya, P.M., Jappji Mehar, Rajesh, V.J. (2025). Investigation of Morphology and Ejecta Emplacement Dynamics of the Copernican Das Crater on the Lunar Farside. Planetary and Space Science, Volume 258. DOI: https://doi.org/10.1016/j.pss.2025.106052
- Samaddar, T., Jappji Mehar (2023). Investigation of Physical Properties of Lunar Crater Facies using Radar Imagery. Presented at the 54th Lunar and Planetary Science Conference (LPSC), Woodland, Texas, USA, March 13–17, 2023.
- Samaddar, T., Jappji Mehar, Chatterjee, R.S., Bhiravarasu, S.S. (2023). Multi-frequency Radar Analysis of Lunar Impact Ejecta Facies. Presented at the 11th European Lunar Symposium, Padua, Italy, June 27–29, 2023.
- Samaddar, T., Jappji Mehar, Chatterjee, R.S. (2023). Radar Scattering Properties of Lunar Impact Craters and Associated Ejecta Facies. Presented at the Indian Planetary Science Conference, PRL, Ahmedabad, March 21–22, 2023.
- Samaddar, T., Jappji Mehar, Chatterjee, R.S., Bhiravarasu, S.S. (2023). Multi-frequency Polarimetric Radar Investigation of Lunar Impact Crater Ejecta Facies. Presented at the American Geophysical Union (AGU) Fall Meeting, San Francisco, USA, December 11–15, 2023.
- Astrophage: The Star Eater published in IIRS Science Portal (Sudoor Manthan)
