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Hydrological Sciences

Mahya Hashemi

(SCIENTIST)

Mahya Hashemi's Contact Card & Information.
Email: mahyasadat.ghazizadehhashemi@nasa.gov
Org Code: 617
Address:
NASA/GSFC
Mail Code 617
Greenbelt, MD 20771
Employer: Science Application International Corp.

Brief Bio


Mahya is a Research Scientist at NASA Goddard Space Flight Center's Hydrological Sciences Laboratory, working with SAIC. Her research focuses on leveraging satellite observations—particularly Synthetic Aperture Radar (SAR) from Sentinel-1 and NISAR—combined with advanced AI techniques, including geospatial foundation models, for applications in agriculture, vegetation water content estimation, and vegetation optical depth retrieval.


Mahya developed a global dataset to assess restoration potential for freshwater quality in support of the UN Freshwater Challenge. She is currently investigating the impact of wetland and riparian zone restoration on freshwater quality using optical imagery and geospatial foundation models for broad-scale generalization.


She is collaborating with Microsoft to develop a Hydrology Copilot for hydrological and drought monitoring analysis. This work leverages NASA's cutting-edge high-resolution (1 km) NLDAS-3 dataset and employs multi-agent systems and retrieval-augmented generation (RAG) architectures built with Azure AI Foundry.


Mahya also collaborates with the snow hydrology team at Goddard to estimate high-resolution snow water equivalent (SWE) by integrating optical, climate, and microwave data with geospatial foundation models, contributing toward a national-scale SWE product.

Research Interests


Global Water and Energy Cycles


Ecohydrology


Crop Growth Monitoring


Microwave and Optical Remote Sensing

Current Projects


Map of Riparian zone globally and assess their impact on fresh water quality

Remote Sensing


Estimating high-resolution vegetation optical depth using GEDI and PACE observations

Remote Sensing


Coffee classification in Vietnam using SAR

Land Cover/Use


Microsoft Co-pilot for NLDAS-3

Cloud Remote Sensing and Modeling

Positions/Employment


Research Scientist

Science Applications International Corporation - NASA Goddard Space Flight Center

October 2024 - Present


Research Assistant

Michigan State University - East Lansing, Michigan

August 2021 - October 2024

Education


Ph.D., 2024, Michigan State University, Civil and Environmental Engineering (Advisor: Narendra Das)

M.S., 2014, Sharif University of Technology, Civil and Environmental Engineering

B.S., 2012, Sharif University of Technology, Civil Engineering

Selected Publications


Refereed

2025. "Estimating crop biophysical parameters from satellite-based SAR and optical observations using self-supervised learning with geospatial foundation models.", Remote Sensing of Environment, 327 114825 [10.1016/j.rse.2025.114825] [Journal Article/Letter]

2024. "Review of synthetic aperture radar with deep learning in agricultural applications.", ISPRS Journal of Photogrammetry and Remote Sensing, 218 20-49 [10.1016/j.isprsjprs.2024.08.018] [Journal Article/Letter]

2024. "Yield estimation from SAR data using patch-based deep learning and machine learning techniques.", Computers and Electronics in Agriculture, 226 109340 [10.1016/j.compag.2024.109340] [Journal Article/Letter]

2023. "Dryspells and Minimum Air Temperatures Influence Rice Yields and their Forecast Uncertainties in Rainfed Systems.", Agricultural and Forest Meteorology, 341 109683 [10.1016/j.agrformet.2023.109683] [Journal Article/Letter]

2022. "Assessing the impact of Sentinel-1 derived planting dates on rice crop yield modeling.", International Journal of Applied Earth Observation and Geoinformation, 114 103047 [10.1016/j.jag.2022.103047] [Journal Article/Letter]

2020. "The Impact of Pavement Permeability on Time of Concentration in a Small Urban Watershed with a Semi-Arid Climate.", Water Resources Management, 34 (9): 2969-2988 [10.1007/s11269-020-02596-3] [Journal Article/Letter]

2019. "Quantification of irrigation water using remote sensing of soil moisture in a semi-arid region.", Remote Sensing of Environment, 231 111226 [10.1016/j.rse.2019.111226] [Journal Article/Letter]

2018. "Estimating the drainage rate from surface soil moisture drydowns: Application of DfD model to in situ soil moisture data.", Journal of Hydrology, 565 489-501 [10.1016/j.jhydrol.2018.08.035] [Journal Article/Letter]