Análisis del índice normalizado de diferencia de vegetación (NDVI) en la zona norte del departamento del Tolima.
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The vegetation in the North zone of the department of Tolima has had a variation due to the climatic change that the planet has undergone in the last years, and diverse anthropic factors like the constructions that disturb the behavior of the soil, what leads to the loss of nutrients and minerals from the land producing an imbalance in the vegetation cover. For this work we will use satellite images of the municipalities of Ambalema, Armero, Falan, Fresno, Honda, Mariquita and Palocabildo that were obtained from the geological service page of the United States (USGS), which will be analyzed by means of a geographic information system (GIS) known as ArcMap, where the NDVI will be applied, this with the objective of determining the behavior of the vegetation, the spatial variability with the passage of time and the type of coverage present in this area. Among the results obtained, it was possible to observe vegetative variability as a result of the presence of armed groups in Tolima at the end of the 20th century, as well as the armorer disaster caused by the eruption of the Ruiz peak in 1985, the latter being the change more significant.