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Dr. Gohar Ghazaryan

Gohar_Website.pngPostdoctoral Researcher

Room 334
Meckenheimer Allee 166
53115 Bonn

E-Mail: [Email protection active, please enable JavaScript.]
Phone: (+49)228/73-4970

Consultation hour: on appointment


Research interests

  • Time series analysis of imagery
  • Landcover/Landuse change
  • Cloud computing
  • Data fusion
  • Forest change analysis


Study Areas

  • Ukraine
  • South Africa
  • Kazakhstan
  • Armenia



  • since 10/2019: Postdoctoral researcher, Department of Geography, University of Bonn
  • since 08/2015 Junior researcher, Center for Remote Sensing of Land Surfaces (ZFL), University of Bonn
  • 09/2013 - 03/2015 Erasmus Mundus Master course on Geospatial technologies: NOVA school of Statistics and Information Management (1st semester), Portugal, Westfälische Wilhelms-Universität Münster, Institute for Geoinformatics, Germany
  • 09/2008 - 06/2012 B.Sc. Cartography, Yerevan State University, Armenia


Teaching (BSc and MSc programs)


Current Projects



Closed Projects





  • Ghazaryan, G., König, S., Eyshi Rezaei, E., Siebert, S., Dubovyk, O. (2020): Analysis of Drought Impact on Croplands from Global to Regional Scale: A Remote Sensing Approach. Remote Sensing 12, 4030.

  • Schreier, J., Ghazaryan, G., Dubovyk, O. (2020): Crop-specific phenomapping by fusing Landsat and Sentinel data with MODIS time series. European Journal of Remote Sensing.

  • Graw, V., Ghazaryan, G., Schreier, J., Gonzalez, J., Abdel-Hamid, A., Walz, Y., Dall, K., Post, J., Jordaan, A. & O. Dubovyk (2020): Timing is Everything–Drought Classification for Risk Assessment. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 13, 428-433.

  • Landmann, T., Dubovyk, O., Ghazaryan, G., Kimani, J., & E.M Abdel-Rahman (2020): Wide-area invasive species propagation mapping is possible using phenometric trends. ISPRS Journal of Photogrammetry and Remote Sensing 159, 1-12.

  • Dubovyk, O., Ghazaryan, G., Löw, F., Graw, V. & J.Schreier (2019): Drought hazard in Kazakhstan in 2000-2016: a remote sensing perspective. Environmental Monitoring and Assessment 191, 510.

  • Ghazaryan, G., Dubovyk, O., Löw, F., Lavreniuk, M., Kolotii, A., Schellberg, J., & Kussul, N. (2018). A rule-based approach for crop identification using multi-temporal and multi-sensor phenological metrics. European Journal of Remote Sensing, 51(1), 511-524.
  • Graw, V.; Ghazaryan, G.; Dall, K.; Delgado Gómez, A.; Abdel-Hamid, A.; Jordaan, A.; Piroska, R.; Post, J.; Szarzynski, J.; Walz, Y. & O. Dubovyk (2017): Drought Dynamics and Vegetation Productivity in Different Land Management Systems of Eastern Cape, South Africa—A Remote Sensing Perspective. Sustainability 2017, 9, 1728.
  • Ghazaryan, G., Dubovyk, O., Kussul, N., Menz, G., 2016. Towards an Improved Environmental Understanding of Land Surface Dynamics in Ukraine Based on Multi-Source Remote Sensing Time-Series Datasets from 1982 to 2013. Remote Sensing 8, 617.


  • Ghazaryan, G., Dubovyk, O., Graw, V., & Schellberg, J. (2018, October). Vegetation monitoring with satellite time series: an integrated approach for user-oriented knowledge extraction. In Remote Sensing for Agriculture, Ecosystems, and Hydrology XX (Vol. 10783, p. 107830W). International Society for Optics and Photonics.
  • Graw, V., Ghazaryan, G., Schreier, J., Gonzalez, J., Abdel-Hamid, A., Walz, Y., ... & Dubovyk, O. (2018, July). Timing is Everything-Drought Classification for Risk Assessment. In IGARSS 2018-2018 IEEE International Geoscience and Remote Sensing Symposium (pp. 8267-8270). IEEE.
  • Landmann, T., Dubovyk, O., Ghazaryan, G., Kimani, J., & Abdel-Rahman, E. (2017, July). Wide-area mapping of invasive species propagation and containment zones in somaliland using phenometric trends and generalized linear modelling. In 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS) (pp. 1103-1106). IEEE.
  • Ghazaryan, G.; Dubovyk, O., Kussul, N., & J. Schellberg (2017). Multi-Sensor Time Series Data Fusion for Agricultural Drought Assessment: Limitations and Potential. Proc ‘EnviroInfo 2017’. Luxembourg, 13-15 September, 2017

MSc Thesis:

Ghazaryan, G. (2015). Analysis of temporal and spatial variations of forest. A case of study in notheastern Armenia.