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Browsing by Autor "C. Pacheco"

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    A Multi-Scale Ecological Approach for the Conservation and Restoration of Venezuelan Andean Cloud Forests
    (2025) C. García‐Núñez; Fermín Rada; Ana Quevedo-Rojas; Mauricio Jeréz; Luis D. Llambí; C. Pacheco; Luis E. Gámez; Emilio Vilanova
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    Identification of Eroded and Erosion Risk Areas Using Remote Sensing and GIS in the Quebrada Seca watershed
    (National University of Colombia, 2023) Cristopher Camargo Roa; C. Pacheco; Sergio Alberto Monjardín-Armenta; R. A. Lopez‐Falcon; Tatiana Gómez-Orgulloso
    The aim of this research was to identify eroded areas and areas at risk of erosion (EAER) as indicators of soil degradation by water erosion in a semiarid watershed of the Venezuelan Andes in 2017. To this effect, remote sensing techniques and geographic information systems (GIS) were used, focusing on spectral reflectance data from a satellite image, given the absence of continuous pluviographic information and data on soil properties in developing countries. This methodology involved estimating the potential water erosion risk (PWER) and mapping eroded and erosion risk areas (EAER) based on calculating the spectral Euclidean distance to bare soils and a remote sensing technique, which was selected via linear regression. Receiver operating characteristics (ROC) curves were determined to define classification thresholds, which were validated by means of a supervised classification and associated to PWER values. The main results indicate that EAER1 identified more eroded areas with bare soils (229,77 ha) as opposed to EAER2 (195,57 ha). Similarly, it was evident that the first alternative was more successful that the second (sum of the first three principal components). The PWER analysis, in addition to the erosion mapping developed and other data and criteria, such as mini-mum area size of interest, could help to consider necessary soil conservation measures.
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    La deforestación y sus factores causales en el estado de Sinaloa, México
    (2017) Sergio Alberto Monjardín-Armenta; C. Pacheco; Wenseslao Plata-Rocha; Gabriela Corrales-Barraza
    El objetivo de esta investigación fue estudiar la deforestación y sus causas en el estado de Sinaloa, México. Para ello, se utilizó la cartografía de Uso de Suelo y Vegetación del año 1993 y 2011 a escala 1:250 000, con esta se estimó la deforestación mediante una técnica de detección de cambios; posteriormente, se caracterizó la deforestación mediante la consulta a expertos. Por último, se aplicó la matriz de cambios para analizar las pérdidas, ganancias y transiciones y corroborar cartográficamente lo obtenido por los expertos y la detección de cambios. Los resultados indican una deforestación de 126.50 km2/año y una tasa media anual de 0.41%. De la consulta a expertos se determinó que las principales causas de estos procesos son la expansión agrícola y la extensión de infraestructura con un impacto de 49.40% y 18.8%, respectivamente. En cuanto a la matriz de cambios, se determinó que especialmente la categoría de selvas perdió 2374.19 km2, por el contrario, la agricultura de temporal también se extendió 3326.62 km2 y la categoría de asentamientos humanos pasó de tener 191.51 km2 a 623.28 km2.

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