Satellite detected water extent between 30 October 2022 and 31 October 2018 in Hadjer-Lamis & Lac Regions, Chad

Name: Satellite detected water extent between 30 October 2022 and 31 October 2018 in Hadjer-Lamis & Lac Regions, Chad
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)WaterChad

Chad

About this dataset

**UNOSAT code FL20221019TCD** This map illustrates satellite-detected surface waters in Hadjer-Lamis & Lac Regions, Chad as observed from a Sentinel-2 acquired on 30 October 2022 at 10:37 local time. Within the cloud free analyzed area of about 17,000 km2, the surface waters appears to have increased of about 700 km2 since 31 October 2018. Based on Worldpop population data and the detected surface waters, the potentially exposed population is mainly located in Mamdi Department with ~28,000 people, Haraze-Al-Biar Department with ~9,700 people and Wayi department with ~9,300 people. 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.

Related datasets

✦ Suggested by OrionAI

Satellite detected water extent in N'Djamena department, N'Djamena Region, Chad as of 20 October 2022

**UNOSAT code FL20221019TCD** This map illustrates satellite-detected surface waters in N'Djamena Department, N'Djamena Region, Chad as observed from a Sentinel-2 image acquired on 20 October 2022 at 10:20 local time. Within the map extent of about 100 km2, about 42 km2 of lands appear to be flooded and 5,408 structures are potentially affected by the floods. Based on Worldpop population data and the detected surface waters, about 160,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).