Samuel N Araya

Postdoctoral Scholar

Stanford University

I am an environmental soil physicist doing research at the intersections of soil physics, biogeochemistry, and data science.

I study interrelationships between soil properties and the environment. How soil properties such as structure and organic matter influence hydrology, biogeochemistry, and broader ecological behaviors.

My methodological approaches range from traditional field- and lab-based research to modern techniques such as machine learning, geospatial analyses, and unmanned aircraft systems.


  • Soils science
  • Data science
  • Machine learning
  • Spatial analysis


  • PhD in Environmental Systems (Soil Physics), 2019

    University of California, Merced

  • MSc in Environmental Systems (Soil Biogeochemistry), 2014

    University of California, Merced

  • BSc in Land Resources and Environment, 2006

    Asmara University

Technical Skills

Soil Science

R | Python | JavaScript

Machine Learning




Linking sub-subsurface biogeochemistry with surface observations

Using data science methods to understand sub-surface biogeochemistry from surface observations

Rice arsenic contamination from a drone

Arsenic detection in rice from drone images using machine learning

Machine Learning Pedotransfer

Unsaturated hydraulic conductivity pedotransfer using machine learning.

Long-term conservation agriculture impact on soil hydrology

Impact of long-term conservation agriculture on soil hydraulic properties and moisture storage

Soil moisture observation from a drone

High resolution soil moisture prediction from drone images using machine learning


  • 367 Panama Street, Stanford, CA, 94305, United States
  • Green Earth Sciences, Room 323