Satellite detected water extents over Lambayeque and Piura Province Provinces, Peru as of 1 April 2023

Name: Satellite detected water extents over Lambayeque and Piura Province Provinces, Peru as of 1 April 2023
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)WaterPeru

Peru

About this dataset

**UNOSAT code FL20230321PER, GDACS Id: 1365556** This map illustrates satellite-detected water using Sentinel-2 acquired on 1 April 2023, 10:36 local time over Lambayeque and Piura Provinces, Peru. Within the cloud free analyzed areas of about 13,000 km², a total of about 1,000 km² of lands appear to be affected with flood waters. Based on Worldpop population data and the flood water extent, ~13,000 people are potentially exposed or living close to flooded areas mainly located in District of Piura with ~3,800 people, Piura District with ~3,800 people, Sechura with ~3,800 people, and Lambayeque ~3,600 people This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the 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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Satellite detected water extents over Lambayeque and Piura Province Provinces, Peru as of 22 March 2023

**UNOSAT code EQ20230321PER, GDACS Id: 1365556** This map illustrates satellite-detected water using Sentinel-2 acquired on 22 March 2023, 10:36 local time over Lambayeque and Piura Provinces, Peru. Within the cloud free analyzed areas of about 16,000 km², a total of about 1,000 km² of lands appear to be affected with flood waters. Based on Worldpop population data and flood water extent, ~13,500 people in Lambayeque district are potentially exposed or living close to flooded areas and ~6,300 people in Lambayeque district. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).