Flood water extent over Hola Prystan City in the east bank of the Dnipro (Dnieper) in Khersonska Oblast, Ukraine as of 17 June 2023; 09:13 UTC

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)EnvironmentUkraine
Ukraine

About this dataset

**UNOSAT code FL20230606UKR** This map illustrates satellite-detected flood waters and affected structures over Hola Prystan City, in the east bank of the Dnieper/Dnipro River in Khersonska Oblast, Ukraine as observed from a WorldView-3 satellite images acquired on 17 June 2023 at 09:13 UTC and 8 June 2023 at 08:35 UTC. Within the analysed area of 11 km², about 27% (3 km²) of Hola Prystan City area appears to be flooded. Water extent appears to have decreased by about 5 km² since 8 June 2023. About 1,300 structures were still affected by floods on 17 June 2023. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

Documentation

UNOSAT datasets and maps are produced using a variety of methods. In general, analysts closely review satellite imagery, often comparing two or more images together, and determine notable changes between the images. For damage assessments, refugee or IDP assessments, and similar analyses, these changes are then manually documented in the vector data by the analyst. For flood extractions, landcover mapping and similar analyses, a variety of automated remote sensing techniques are used to extract the relevant information which is then reviewed and revised as necessary by the analyst. In all cases, resulting data is then loaded into a standardized UNOSAT geodatabase and exported asshapefiles for dissemination. This is a preliminary assessment and has not yet been validated in the field. It is important to consider the characteristics of the source imagery used in the analyses when interpreting results. For damage assessments it should be noted that only significant damage to the structural integrity of the buildings analyzed can be seen in imagery, while minor damage such as cracks or holes may not be visible at all. For flood extractions using radar data it is important to note that urban areas and highly vegetated areas may mask the flood signature and result in underestimation of flood waters. Users with specific questions or concerns should contact unosat@unitar.org to seek clarification.

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