Flood Impact assessment of Cabuyao City and City of Calamba, Laguna Province, Region IV-A, Philippines as of 5 November 2022

Name: Flood Impact assessment of Cabuyao City and City of Calamba, Laguna Province, Region IV-A, Philippines as of 5 November 2022
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)EnvironmentPhilippines

Philippines

About this dataset

**UNOSAT code TC20221028PHL, GDACS Id: 1000942** This map illustrates satellite-detected surface waters in Cabuyao City and City of Calamba, Laguna Province, Region IV-A, Philippines as observed from a Kanopus-V image acquired 5 November 2022 at 11:12 local time. Within the analysis extent of about 2,200 hectares, approximately 120 hectares of land appear to be flooded. Based on Worldpop population data and the detected surface waters within the analysis extent, approximately 4,400 people are potentially exposed to or living close to flooded areas along with 256 structures and a port potentially affected by flooding. 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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Satellite detected waters in Quezon Province, Bicol Region (Region V) of Philippines as of 12 November 2020

**UNOSAT code: TC20201111PHL** This map illustrates satellite-detected surface waters in Calauag and Lopez municipalities of Quezon province of Philippines as observed from a Sentinel-1 image acquired on 12 November 2020 at 05:38 local time. Within the analyzed area of about 260 km2, a total of about 20 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters, about 8,300 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 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.