Polissia in Volyn region is the area of many lakes, which create a strategic potential of fresh water, organic and mineral resources. Thus, the urgent task is to make cadaster accounting of lakes and assess their natural and anthropogenic transformations by using advanced methods of remote sensing (RS) and technologies of geographic information systems (GIS-technologies). The conducted research has confirmed that the water area of the model lake in Polissia of Volyn region is getting smaller due to the effect of natural and anthropogenic transformations. The obtained results of assessment of the temperature regime of the Bilske lake surface by using the data of Landsat-8 (TIRS) in EO Browser show the tendency to raise of the annual average temperature, and therefore, activation of the processes of eutrophication in summer seasons and accumulation of the residues of autochthonous and allochton substances.By analyzing space images (Sentinel-1, Sentinel-2, Landsat) of high resolution with different spectral range, researchers are able to assess ecological conditions of the lake by NDVI index, to identify the dynamics of thermal regime of the lake surface. The research confirms the tendency of raise of the water body temperature. The proposed approach to assessment of the ecological conditions of lakes by applying RS technologies is effective both in the methodic and practical terms.
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