Satellite detected water extent over Kwakwani town along the Berbice river as of 07 June 2021, Region 10, Guyana

Name: Satellite detected water extent over Kwakwani town along the Berbice river as of 07 June 2021, Region 10, Guyana
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)WaterGuyana

Guyana

About this dataset

**UNOSAT code: FL20210520GUY** This map illustrates satellite-detected surface waters along the Berbice river in Upper Demerara-Berbice Region of Guyana as observed from RCM-2 radar image acquired on 07 June 2021 at 22:21 UTC. Within the analyzed area of about 38,000 ha, a total of about 48 ha of lands were observed as flooded. This is a preliminary analysis that has not yet been validated in the field. Please send ground feedback to UNITAR-UNOSAT. Important note: Flood analysis from radar images may underestimate the presence of standing waters in built-up areas and densely vegetated areas due to backscattering properties of the radar signal.

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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Satellite detected water extent along the Mazaruni river as of 23 June 2021, Region 7 - Cuyuni-Mazaruni, Guyana

**UNOSAT code: FL20210520GUY** This map illustrates satellite-detected surface waters along the Mazaruni river in Cuyuni-Mazaruni Region of Guyana as observed from Sentinel-1 radar image acquired on 23 June 2021 at 22:15 UTC. Within the analyzed area of about 480 km2, the water extent appears to have decreased of about 3 km2 since 9 June 2021. This is a preliminary analysis that has not yet been validated in the field. Please send ground feedback to UNITAR-UNOSAT. Important note: Flood analysis from radar images may underestimate the presence of standing waters in built-up areas and densely vegetated areas due to backscattering properties of the radar signal.