Kovalskyy, Valeriy

Assistant Research Professor
Office Phone Number: 
605-688-5834
Email: 
Valeriy.Kovalskyy@sdstate.edu
Education: 

PhD (2011), Geographic Science and Engineering, South Dakota State University, Brookings, South Dakota, Thesis title: Development and validation of the Event Driven Phenology Model
MSc (2004), Environmental Sciences, Ohio University, Athens, Ohio, USA.
BA (2001), Geography, Ivan Franko Lviv National University, Ukraine.

Previous Position 
Post-doctoral Research Associate, GSCE, South Dakota State University, SD, senior WELD algorithm research, developer and programmer.

About me

I am an assistant research professor funded by the NASA Web Enabled Landsat Data (WELD) and the USGS Landsat 8 WELD projects for which I undertake research to develop, optimize, and assess  the production of derived remote sensing science products.
 http://globalmonitoring.sdstate.edu/projects/weldglobal/gweld.html

The primary objectives of my research are to produce long term data records to investigate changes in land cover and phenology in the last 30 years.

My interest in phenology and remote sensing comes from my PhD thesis topic: “Development and validation of the Event Driven Phenology Model”. For the thesis I developed and validated a new approach to phenology modeling that can a) interact with ongoing meteorological conditions, b) work in both prognostic and diagnostic modes, c) track uncertainties via error propagation; and d) use remotely sensed data (NDVI) to adjust outcomes via data assimilation. Development of the new interactive phenology model required solid scientific as well as technical preparation that came from my education and more than 3 years of industrial programing experience. I developed my research and technical skills while obtaining my Master of Environmental Science degree from Ohio University and my Bachelor’s degree in geography from Ivan Franko National University in Lviv Ukraine, where I worked on use of emerging computer technologies for optimization of zoning in nature protection areas.


Despite heavy technical load of my current occupation, I have managed to maintain my academic record and participation in conferences:

PUBLICATIONS

Results of my work in WELD project were used to illustrate Landsat 5 and 7 coverage in Nature magazine comments "Satellites: Make Earth observations open access" by Michael A. Wulder & Nicholas C. Coops. http://www.nature.com/news/satellites-make-earth-observations-open-acces...

Kovalskyy, V. and Roy, D.P. 2015. A one year Landsat 8 conterminous United States study of cirrus and non-cirrus clouds, Remote Sensing, 7, 564-578.

Roy, D.P., Kovalskyy, V., Zhang, H., Yan, L., Kommareddy, I., The utility of Landsat data for global long term terrestrial monitoring, chapter in Remote Sensing Time Series  -  Revealing Land Surface Dynamics, Eds. Claudia Kuenzer, C., Dech, S.,  Wagner, W., Springer.  In Press

Roy, D.P., Wulder, M.A., Loveland, T.R., Woodcock, C.E., Allen, R.G., Anderson, M.C., Helder, D., Irons, J.R., Johnson, D.M., Kennedy, R., Scambos, T.A., Schaaf, C. B., Schott, J.R., Sheng, Y., Vermote, E.F., Belward, A.S., Bindschadler, R., Cohen, W.B., Gao, F., Hipple, J.D., Hostert, P., Huntington, J., Justice, C.O., Kilic, A., Kovalskyy, V., Lee, Z. P., Lymburner, L., Masek, J.G., McCorkel, J., Shuai, Y., Trezza, R., Vogelmann, J., Wynne, R.H., Zhu, Z., 2014. Landsat-8: science and product vision for terrestrial global change research, Remote Sensing of Environment, 145, 154–172.

Roy, D.P., Qin, Y., Kovalskyy, V., Vermote, E.F., Ju, J., Egorov, A., Hansen, M.C., Kommareddy, I., Yan, L., 2014. Conterminous United States demonstration and characterization of MODIS-based Landsat ETM+ atmospheric correction. Remote Sensing of Environment, 140, 433-449.

Kovalskyy, V., Henebry, G.M., Roy, D.P., Adusei, B., Hansen, M., Senay, G., Mocko, D.M. 2013. Evaluation of a coupled event driven phenology and evapotranspiration model for croplands in the United States northern Great Plains. Journal of Geophysical Research – Atmospheres, 5065–5081.

Hansen, M.C., Egorov, A., Potapov, P., Stehman, S.V., Tyukavina, A., Turubanova, S.A., Roy, D.P., Goetz, S.G., Loveland, T.R., Ju, J., Kommareddy, A., Kovalskyy, V., Forsythe, C., Bents, T. 2013. Monitoring CONUS land cover change with Web-Enabled Landsat Data (WELD), Remote sensing of Environment, 140, 466-484.

Kovalskyy, V. and Roy D. P., 2013. The global availability of Landsat 5 TM and Landsat 7 ETM+ data land surface observations and implications for global 30m Landsat data product generation. Remote Sensing of Environment, 130, 280–293.

Ju, J., Roy, D.P., Vermote, E., Masek, J., Kovalskyy, V., 2012. Continental-scale validation of MODIS-based and LEDAPS Landsat ETM+ atmospheric correction methods. Remote Sensing of Environment, 122, 175–184.

Kovalskyy, V. and Henebry, G. M., 2012. A new concept for simulation of vegetated land urface dynamics – Part 1: The event driven phenology model. Biogeosciences, 9, 141-159.

Kovalskyy, V. and Henebry, G. M., 2012. Alternative methods to predict actual evapotranspiration illustrate the importance of accounting for phenology – Part 2: The event driven phenology model. Biogeosciences, 9, 161-177.

Kovalskyy, V., Roy, D. P, Zhang, X. Y., Ju, J., 2011. The suitability of multi-temporalWeb-Enabled Landsat Data (WELD) NDVI for phenological monitoring – a comparison with flux tower and MODIS NDVI. Remote Sensing Letters, 3:4, 325–334.

Roy, D. P., Ju, J., Kline, K., Scaramuzza, P. L., Kovalskyy, V., Hansen, M., Loveland, T. R., Vermote, E., and Zhang, C. 2010. Web-enabled Landsat Data (WELD): Landsat ETM+ composited mosaics of the conterminous United States, Remote Sensing of Environment, 114, 35-49.

Kovalskyy, V., and Henebry, G. M., 2009. Change and persistence in land surface phenologies of the Don and Dnieper river basins, Environmental Research Letters, 4, 045018.

Kovalskyy, V., and Henebry, G. M., 2009. Recent trends in land surface phenologies within the Don and Dnieper River basins from the perspective of MODIS collection 4 products, in: Regional Aspects of Climate-Terrestrial-Hydrologic Interactions in Non-boreal Eastern Europe, NATO Science for Peace and Security Series, Springer Netherlands, 183-189.

 

PRESENTATIONS AND CONFERENCE PROCEEDINGS

Kovalskyy, V., Roy, D.P., A one year Landsat 8 conterminous United States study of cirrus and non-cirrus clouds. B51E-0070. Multisensor Long-Term Land Surface Data Records, Fall Meeting, AGU, San Francisco, CA, December 15-19, 2013.

Zhang H.K., Roy, D.P., Kovalskyy, V., Normalization of global long term Landsat data to standard sun-target-sensor geometry using a MODIS BRDF parameter climatology, Pecora 19 Symposium in conjunction with the Joint Symposium of ISPRS Technical Commission I and IAG Commission 4, Denver, CO, US, November 17-20, 2014.

Roy, D.P., Kovalskyy, V., Yan, L., Egorov, A., Kommareddy, I., Zhang, H., Hansen, M., Boschetti, L.,  Votava, P., Nemani, R., Web-Enabled Landsat Data (WELD) for monitoring contemporary terrestrial change nearly everywhere, U.K. Remote Sensing and Photogrammetry Society Annual Conference, University of Aberystwyth, September 2-5, 2014

Roy, D.P., Kovalskyy, V., Zhang H., Landsat 8 WELD compositing – a CONUS one year analysis U.S. Landsat Science Team Meeting. Forest Service Pacific Northwest Research Station, Corvallis, Oregon, USA, July 22-24, 2014

Roy, D.P., Kovalskyy, V., Yan, L., Egorov, A., Kommareddy, I., Zhang, H., Hansen, M., Boschetti, L.,  Votava, P., Nemani, R., Web-Enabled Landsat Data (WELD) for monitoring contemporary terrestrial change nearly everywhere, GEOBIA 2014: 5th International Conference on Geographic Object-Based Image Analysis, Thessaloniki, Greece, 21-24 May, 2014.

Roy, D.P., Kovalskyy, V., Yan, L., Egorov, A., Kommareddy, I., Zhang, H., Hansen, M.,  Boschetti, L.,  Votava, P., Nemani, R., Web-Enabled Landsat Data (WELD) for monitoring  contemporary terrestrial change nearly everywhere, Frontiers in Earth Observation for Land System Science - a joint workshop of the EARSeL SIG LULC and the NASA LCLUC Science Team, Humboldt-Universität, Berlin, Germany, 17-18 March, 2014.

Roy, D.P., Kovalskyy, V., Kommareddy, I., Yan, L., Votava, P., Nemani, R., Egorov, A.,  Hansen, M., Global Web-Enabled Landsat Data, 2nd Global Land Project Open Science Meeting, Berlin, Germany, 19-21 March, 2014.

Roy, D.P., Kovalskyy, V., Kommareddy, I., Votava, P., Nemani, R., Yegorov, A., Hansen, M., Yan, L., Global Web‐Enabled Landsat Data. B33M. Multisensor Long-Term Land Surface Data Records, Fall Meeting, AGU, San Francisco, CA, December 9-13, 2013.

Kovalskyy, V., Roy, D.P., Yegorov, A., New Web-enabled Landsat Data (WELD) temporal compositing. 6th International conference Land from Space - most effective solutions. Moscow, Russia, October 1-3, 2013.

Salmon, B.P., Wessels K.J., Van Den Bergh,  F., Steenkamp,K.,  Kleynhans, W., Swanepoeld,   Roy,  D.P., Kovalskyy, V., Evaluation of Rule-Based Classifier for Landsat-Based Automated Land Cover Mapping In South Africa,  IEEE International Geoscience and Remote Sensing Symposium, Melbourne, Australia, July 21–26, 2013.

Kovalskyy, V., Roy, D.P., Qin, Y., Improved Web‐enabled Landsat Data (WELD) temporal compositing, Earth Observation for Global Changes (EOGC) and 2013 Canadian Institute of Geomatics (CIG) Annual Conference. Toronto, Canada, June 5-7, 2013.

Wessels, K.J., Salmon, B.P., Van Den Bergh,  F., Steenkamp,K., Kleynhans, W., Swanepoeld.,  Kleyn, L., Roy D.P., Kovalskyy, V., Implementation and testing of WELD and automatic spectral rule-based classifications for Landsat ETM+ in South Africa, 35th International Symposium on Remote Sensing of Environment, Earth Observation and Global Environmental Change, Beijing, China, April 22-26,  2013.

Kovalskyy, V., Roy, D.P., Qin, Y., Vermote, E.F., Egorov, A., Quality assessment of MODIS-based atmospheric correction of conterminous United States Web Enabled Landsat ETM+ data, IN52B. Quality Assessment of Satellite-Derived Land Surface Variables, Fall Meeting, AGU, San Francisco, CA, December 3-7, 2012.

Roy, D.P., Kommareddy, I., Kovalskyy, V., Votava, P., Nemani, R., Ju, J., Qin, Y., Prototyping Global Web Enabled Landsat Data Production, Distribution and Visualization, IN52A. Challenges in Analysis and Visualization of Large Earth Science Data Sets, Fall Meeting, AGU, San Francisco, CA, December 3-7, 2012.

Kommareddy, I., Roy, D.P., Kovalskyy, V., Kommareddy, A., Prototyping Global Web Enabled Landsat Data (WELD) Product Access via the Internet, IN31A. Data Interoperability and Interuse Solutions, Fall Meeting, AGU, San Francisco, CA, December 3-7, 2012.

Kovalskyy, V., Roy, D.P., The availability of cloud-free Landsat TM and ETM+ land observations and implications for global Landsat data production, European Association of Geoscientists and Engineers (EAGE) XIth International Conference “Geoinformatics: Theoretical and Applied Aspects”, Kyiv (Kiev), Ukraine, May 14-17, 2012.

Kovalskyy, V., Henebry, G. M., Roy, D. P., Senay, G. B., Evaluation of the Event Driven Phenology Model Coupled to the VegET Evapotranspiration Model Using Spatially Explicit Comparisons with Independent Reference Data, B13A. Fall Meeting, AGU, San Francisco, CA, December 5-9, 2011.

Kovalskyy, V., Henebry, G. M., Quantifying the impact of changes in crop area on evapotranspiration regimes in the US corn and soybean belts through phenological modeling and data assimilation, B23G. Fall Meeting, AGU, San Francisco, CA, December 13-17, 2010.

Kovalskyy, V., Henebry, G. M., Impacts of phenology on estimation of actual evapotranspiration with VegET model, B43B. Fall Meeting, AGU, San Francisco, CA, December 14-18, 2009.

Kovalskyy, V., Henebry, G., Estimation of actual evapotranspiration through model coupling and data assimilation with remotely sensed land surface properties, IN31A. Spring Meeting, AGU, Toronto, Canada, May 24-27, 2009.

Kovalskyy, V., Henebry, G., An Event Driven Phenology Model: Results from initial testing, B51B. Fall Meeting, AGU, San Francisco, CA, December 15-19, 2008.

Last modified: 
Sep 28, 2015