Ioannis Angelidis


Ioannis Angelidis


PhD project: Remotely sensed mapping of water table levels and humidity on Danish organic soils

University: Aarhus University
Department: Department of Environmental Science

Section: Environmental Social Science and Geography

Research group: SGA – Rural and urban land use
Supervisor(s):  Pia Frederiksen
Co-supervisor(s): Gregor Levin
Project term: 01.12.2019 – 30.11.2022
Master’s degree:  MSc in Geoinformatics, Aalborg University, Denmark. MSc in Geography and Regional Planning, National Technical University of Athens, Greece



It is estimated that 65 million tons of carbon is stored in organic soils in Denmark and approximately 70% of organic soils is located in agricultural fields. These carbon stocks can be destabilized by anthropogenic disturbances related to agricultural activities, forestry or extraction of peat. Another important factor that can affect these stocks is soil moisture and groundwater levels. Recent events have brought forward the fact that agricultural fields have been taken out of production and their state of management is unknown. As result, the greenhouse gas (GHG) emission factors of those fields requires investigation for potential adjustment


The objective of the PhD project is to contribute to the knowledge of firstly, estimating soil moisture content of organic soils in Denmark in relation to groundwater levels by calibrating, validating and applying remotely sensed data and secondly, use that relation to estimate new emission factors for organic soils by using soil moisture as a proxy.


The first step of the project is a calibration of the remotely sensed data available by using in-situ soil moisture measurements freely available in selected areas of the world by the International Soil Moisture Network. The remotely sensed data will primarily include satellite radar scans (Sentinel 1 SAR) as well as thermal scans (Sentinel 3), aerial imagery and LiDAR scans used as proxies for the estimation and validation of soil moisture content.

The second step of the project is to examine the relation between groundwater level and soil moisture content.  The purpose is to create methods that estimate the groundwater level based on the percentage of soil moisture over organic soils.

Finally, the emission factors will be determined and/or updated based on the results of the methods above.


  • Department of Geodesy and Geoinformation, Technical University of Vienna
  • Geological Survey of Denmark and Greenland (GEUS)

ID: 81499345