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CATHALAC,
in follow up to its mission to provide technical support during extreme events, and particularly in the context of SERVIR, a project which we jointly implement with NASA and USAID, is generating a series of maps, which reflect areas affected by heavy rains in Uruguay where floods have been reported in several cities in the northern part of the country. The SERVIR team has developed preliminary analyses of certain areas by processing satellite images from EO-1 (ALI), Landsat, and MODIS. See maps and descriptions below.
Preliminary analysis of flooded areas in Paso de Toros, Uruguay
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4 Dec 2009 - This preliminary analysis of flooded areas relied upon an image from the ALI sensor on board the NASA EO-1 satellite, taken on December 4, 2009, of Paso de los Toros and the Rincón del Bonete artificial lake. Another historic Landsat 5 image from November 20, 2006, served as a base image in order to compare water extents.
In the complete area analyzed (left-hand side of the figure), approximately 15,000 hectares of land seems to be flooded, in comparison to the historic image.
In the Paso de los Toros area (pair of images on the right-hand the right of the figure), a significant increase in the width of the river has been identified, covering approximately 1730 more hectares of land than before. The band combination (7-4-1 for Landsat and 9-5-2 for ALI) highlights the difference between water, bare soil or urban areas, and between wet and dry vegetation.
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Image credit: SERVIR/CATHALAC/NASA/USAID/GEO
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| Areas affected by flooding in the Paso del Palmar artificial lake, Uruguay |
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27 Nov 2009 - This analysis utilized medium resolution satellite images (MODIS) in order to identify flooded areas. A series of images covers the entire country of Uruguay, and an increase of approximately 4,300 hectares in the Paso del Palmar artificial lake is visible. The cyan color represents the water's original extent as measured on November 9, 2009, and red represents flooded areas between the 19th and 25th of November 2009.
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Image credit: SERVIR/CATHALAC/NASA/USAID/GEO
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| Areas affected by flooding near Rio Uruguay in Uruguay, Argentina and Brazil |
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27 Nov 2009 - 27 Nov 2009 - This analysis utilized medium resolution satellite images
(MODIS) in order to identify flooded areas. A series of images covers
the entire country of Uruguay, and a visible increase in the river size is noticeable, especially between Salto and Bella Union. The cyan
color represents the water's original extent as measured on November 9,
2009, and red represents flooded areas between the 19th and 25th of
November 2009.
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Image credit: SERVIR/CATHALAC/NASA/USAID/GEO
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| Accumulated precipitation during the week of 16-23 November and precipitation forecast for the following week |
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25 Nov 2009 - As a result of heavy rains in Uruguay, the SERVIR team generated this perspective of accumulated rainfall during the week of November 16 through 23, 2009, and a forecast for the following week, based on information from NOAA's CMORPH and GFS. One can see that the majority of the country received in excess of 300 mm of rain during the first week.
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Image credit: SERVIR/CATHALAC/NASA/USAID/GEO
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