Browsing by Author "Naula Yunga, Joffre Vinicio"

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    Incendios forestales y su análisis de severidad utilizando imágenes satelitales PlanetScope y Sentinel en la zona de recarga hídrica del cantón Cuenca
    (Universidad de Cuenca. Facultad de Ciencias Agropecuarias, 2026-02-18) Naula Yunga, Joffre Vinicio; Vicuña Córdova, Michelle Abigail; Lupercio Novillo, Rosa Lucía
    Forest fires represent one of the primary disturbances affecting high-Andean ecosystems, resulting in the loss of vegetation cover, soil degradation, and reduced water regulation capacity. This study aims to evaluate the severity of forest fires occurring in the water recharge zone of the Cuenca canton. Six fire-affected areas were selected, and satellite images from PlanetScope and Sentinel-2 were integrated using fusion techniques to improve spatial and spectral resolution. Percentile or relative methods were used to analyze fire severity before and after the fire, focusing on the Normalized Burn Rate (NBR), its differential version (dNBR), and NDVI (Normalized Difference Vegetation Index). The fusion of data at different resolutions enabled a more accurate capture of the fire damage gradient in complex areas within the typical Andean mountain ecosystem. Furthermore, the percentile method allows for the classification of fire severity without field validation by establishing relative thresholds applicable to the specific conditions of each area. In the six study areas, marked decreases were observed in both indices; in Yanasacha, the NDVI decreased from healthy values of 0.94 – 0.99 to a minimum of −0.26, reflecting the loss of the leaf area index (LAI) and the decrease in photosynthetic activity; the quantitative analysis of the affected areas revealed variations in the extent and severity of the fires, with Yanasacha standing out with 42.05% and Llaviuco with 66.02% in the moderately high severity category.