It’s been established that the problem of disappearing of open water body and the use of Earth remote sensing data for their monitoring is relevant and poorly covered in current Ukrainian and foreign scientific studies. The necessity of complex solution method has been also determined. The purpose of this paper is to study the dynamics of surface water area over a 45-year period (over a long period of time) across the Iziaslav district of Khmelnytsky on the basis of programming analysis of satellite imagery and the results from field surveys at key research sites. In this study, the freely available QGIS software was used to process satellite imagery. Field surveys (implied on the ground) took place at water bodies which disappeared in 1975, 1989, 2001, 2018. Multispectral LANDSAT imagery of remote sensing from 1975, 1984, 1989, 2001, 2018 were acquired and analyzed across the study region. High-quality images with cloud coverage of <3% have been selected to support this research, as well as the quantity of all available images. Spectral analysis of the district territory has been performed with the help of special indicators of field surveys and QGIS software. The mapping of available water surface areas has been performed on the basis of the calculations of the spectral indices of NDWI and NDTI. Threshold values of the spectral indices for the classification of raster image components of the studied area are determined. Total changes in open water surface area between 1975 and 2018 have been quantified. It has been noted that total surface water area has decreased from 2933 hectares to 1499 hectares, a decrease of 48%. The impact of warmer air temperatures on disappearing water bodies has been specified. The research has been conducted on the basis of long-term data with the help of modern methods of satellite imagery processing. The results of the given research can be used for further territory monitoring and further researches within other administrative-territorial units, in particular for making decisions on land use, developing strategic directions of overcoming environmental problems of land use, setting threshold indicators of land use in climate changing conditions, coastal and water bodies buffer zones monitoring.
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