Product ID: 2575 - English
Published: 12 Apr, 2017
GLIDE: LS20170403COL

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Following a large mudflow that hit the city of Mocoa (Department of Putumayo, Colombia) on 31 March 2017 as a consequence of the heavy rains, the International Charter Space and Major Disasters has been activated upon the request of the National Unit for Disaster Risk Management (UNGRD) / Unidad Nacional para la Gestion del Riesgo de Desastres, IDEAM. In response to this emergency, UNITAR-UNOSAT has carried out satellite based damage analysis to assess (visible) building structural damage caused by mudflows. This map illustrates satellite-detected damaged structures including building damage density in Mocoa city and its surroundings. Analysis has been undertaken by using post satellite imagery acquired by Pleiades and Geoeye-1 satellites on the 7 and 10 April 2017 and pre satellite images acquired by Worldview-2 & 1 satellites on the 21 December 2016 and 26 December 2013. As result of UNOSAT satellite analysis, a total of 1,082 buildings were detected as damaged of which 736 observed as destroyed or washed out by mudflow and 346 observed as severely damaged. Due to the pronounced incident angle and cloud cover of the satellite images, UNITAR-UNOSAT has also used orthophotos collected by Corpoamazonia in order to validate satellite based analysis. Orthophotos and additional baseline data were provided by OSM Humanitarian Mapping Unit and UMAIC (Unidad de Manejo y Analisis de Informacion de Colombia) who is also providing information management coordination support for this event. Kindly note that the number of damaged structures could have been underestimated due to the parameters of the images. This analysis has not yet been validated in the field. Please send ground feedback to UNITAR-UNOSAT.
Satellite Data Post (1): Pleiades
Imagery Date: 07 &10 April 2017
Resolution: 50 cm
Copyright: CNES (2017), Distribution AIRBUS DS
Source: Airbus Defence and Space
Satellite Data Post (2): GeoEye-1
Imagery Date: 10 April 2017
Resolution: 50 cm
Copyright: DigitalGlobe, Inc
Source: USGS- HDDS
Satellite Data (Pre): WorldView-2 & WorldView-1
Imagery Date: 21 Dec 2016 & 26 Dec 2013
Resolution: 50 cm
Copyright: DigitalGlobe, Inc
Source: USGS- HDDS
Ortophotos (Post & Pre): 4 April 2017 & 16 February 2017
Copyright: Corpoamazonia
Roads: OpenStreetMap & Humanitarian Mapping Unit (12 April 2017)
Neighborhoods: Secondary data from the ground
(7 April 2017)
Rivers: Official data from the Colombian Government
Other data: USGS, UNCS, NASA, NGA,
Production: UNITAR - UNOSAT