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Identification of urban surface temperature patterns-urban related to heat urban island phenomena- in the City of Caracas-Venezuela.

KARENIA CORDOVA SAEZ

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The city of Caracas, as many others Latin-American cities, has experiment a fast growth in the late 20 years, demographic pressures, a lack of an appropriate urban planification and the socio-economical problems, which tend to reinforce the urbanization phenomena, that has transformed the environment and the quality of life in these cities. Geospatial tools has provide an interesting perspective to understand the dynamics of these phenomena’s, the use of thermal band to measure the extension an intensity of urban heat island has been used combined with terrestrial observations, to explain the changes in the urban surface patterns. Combining radiometric, resampling and geometrics corrections techniques, and integrating this information into a GIS it is possible to identified urban heat critical areas, more accuracy and related to the urban land use, and to the urban surface temperature patterns observed. These works shows the result of the observations develops in the city of Caracas, during the dry season in April 2015 using LANDSAT 8 OLI images, ERDAS 2014 for image processing, and ARC-GIS 10.3 for cartographic development. Radiometric and Geometric correction (pixel by pixel) with ERDAS, allow us to work, not also at urban scales but a at municipality level, adapted to urban planner scales, in order to observe the variations in the urban canopy related to the urban surface temperatures observed. Results of the study were useful to identify at the city and municipality level, critical areas and the structures related to these thermal patterns. This information will be useful to the municipalities authorities, to develop mitigations and adaptation strategies, in order to prevent the intensification of the urban heat island, during the occurrence of a strong dryness period, or heat waves, which might affect the city, the populations and the environment.