Análisis de edificaciones visualmente dañadas en la ciudad de Mocoa, Colombia

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.

This map illustrates areas potentially affected by the mudflow, extracted from a Pleiades and GeoEye-1 satellite images acquired on the 10 April 2017 over Mocoa city and its outskirts, in Putumayo Department, Colombia. Inside some neighbourhoods of the city of Mocoa, flood waters and mudflow have receded compared with previous analysis performed by UNOSAT using an image from 4 April 2017. The situation as of 10 April 2017 reveals: 22 km of roads seem potentially affected and about 1,300 buildings are within areas which are still experiencing floods and mud flow. It is likely that flood waters and mudflow could have been systematically under or overestimated along highly vegetated areas and within built-up urban areas. This analysis has not yet been validated in the field. Please send ground feedback to UNITAR-UNOSAT.

**UNOSAT code: EQ20260810COL, GDACS ID: 1557236** Este mapa presenta una evaluación de daños basada en imágenes satelitales de la ciudad de Zarzal, departamento Valle del Cauca, ubicada aproximadamente a 50 km del área epicentral del terremoto de magnitud 7,4 ocurrido el 10 de agosto de 2026 en Colombia. Los daños fueron identificados principalmente en una imágen satelital Pléiades de muy alta resolución, adquirida el 13 de agosto de 2026. Dentro del área analizada, se identificaron 21 edificaciones con daños y 180 edificaciones como potencialmente dañadas. El alto ángulo de incidencia (>40°) de las imágenes satelitales utilizadas para este análisis puede afectar la precisión de los resultados. Por lo tanto, las estimaciones de daños derivadas de imágenes satelitales con un ángulo de incidencia tan elevado deben interpretarse con precaución. Este es un análisis preliminar que aún no ha sido validado en campo. Se recomienda realizar una verificación en terreno. Los comentarios y observaciones pueden enviarse al Centro de Satélites de las Naciones Unidas.

Este mapa ilustra las estructuras potencialmente dañadas por el sismo del 19 de septiembre de 2017 con intensidad de 7.1 grados en la escala de Richter, que fueron detectadas a través de imágenes de satélite para la colonia Cuautepec Madero en la Ciudad de México. Se identificaron 29 estructuras potencialmente dañadas dentro de la imagen de satélite base, de las cuales 16 se encuentran dentro del límite administrativo de la colonia. En análisis se realizó con una imagen WorldView-2, adquirida el 26 de septiembre de 2017, caracterizándose como un análisis preliminar que aún no es validado en campo.

This map illustrates satellite-detected water bodies and inundated areas in Mocoa city, Putumayo department in Colombia as seen on Resourcesat-2 satellite imagery collected 04 April 2017. Heavy rainfall in the area caused flooding, landslides and mudflow that affected the city. UNOSAT extracted a water index from the satellite image to determine areas of standing water as well as soils with varying levels of water content (i.e. mud). Within the city of Mocoa and the current map extent, about 18 km of roads are potentially affected. About 2900 buildings are within areas which experienced floods and mudflow. It is likely that flood waters and inundation have been systematically underestimated along highly vegetated areas and within built-up urban areas because of the special characteristics of the satellite data used. This analysis has not yet been validated in the field. Please send ground feedback to UNITAR /UNOSAT.

Este mapa ilustra las estructuras potencialmente dañadas por el sismo del 19 de septiembre de 2017 con intensidad de 7.1 grados en la escala de Richter, que fueron detectadas a través de imágenes de satélite para la colonia Capultitlan en la Ciudad de México. Se identificaron 17 estructuras potencialmente dañadas dentro de la imagen de satélite base, de las cuales 12 se encuentran dentro del límite administrativo de la colonia. En análisis se realizó con una imagen WorldView-2, adquirida el 26 de septiembre de 2017, caracterizándose como un análisis preliminar que aún no es validado en campo.