Examinando por Materia "Cobertura vegetal"
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- PublicaciónAcceso abiertoAnálisis del índice normalizado de diferencia de vegetación (NDVI) en la zona sur del departamento del Tolima(Universidad de Ibagué., 2019) Segura Guzmán, Diego Alejandro; Bejarano Flórez, Farly Stefany; Hernández López, Jorge ArmandoThe southern area of the department of Tolima is a place where economic activity is mostly reflected in agriculture and livestock, which leads to a change in the soil, these activities have degrading consequences. These alterations can be produced by climatic, social or anthropic agents, where the flora and fauna of the place are found. In this work we analyzed the 6 municipalities corresponding to this area (which includes the following municipalities: Alpujarra, Ataco, Dolores, Natagaima, Río Blanco and Planadas), in such a way that the changes that have had the vegetal coverage through the use of NDVI images, using the Geographic Information System (GIS) ArcMap to obtain a map of changes by combining them with the objective of categorizing the change in vegetation cover, determining the spatial and temporal variability of vegetative behavior and distinguish the types of coverage in the area. Finally, the results have been reflected in the vegetative variability due to the anthropological and climatic factors that have affected the area in a positive way during the rainy season, but also negatively in the summer. On the other hand, satellite images are also seen by the cloudiness that produces a change in the reality of the image, thus altering the real result.
- PublicaciónAcceso abiertoDistribución espacial de la contaminación por fuentes fijas y su relación con parámetros hidrológicos en la zona oeste del departamento del Tolima(Universidad de Ibagué, 2018) Castrillón Menza, Richard Edinson; Rueda Montealegre, Jorge AntonioIn the department of Tolima there are climatic changes which alter the economic, social and environmental activities. Anthropic activities are affected by the increase in temperature and precipitation which generate changes in plant cover and alterations in water sources. For the development of the research satellite images of the years 1970, 1985, 2000, 2005, 2013 and 2018 were used, which are made atmospheric corrections through the IDRISI program, after this the Vegetation Index (NDVI) is made, water index (NDI), and soil surface temperature (LST). As a result in different rates found a rise in temperature, which is a factor that is inversely proportional to the amount of vegetation and water existing in the population.