Especialización en Sistemas de Información Geográfica

Permanent URI for this collection

https://usc.scimago.es/handle/20.500.12421/4414

Browse

Now showing 1 - 4 of 4

Análisis multitemporal del cambio de cobertura vegetal debido a la explotación de carbón a cielo abierto en la mina El Cerrejón, ubicada en el departamento de La Guajira, Colombia, durante el período comprendido entre 1986 y 2023.
(Universidad Santiago de Cali, 2023-09-13) Arango Cifuentes, Andres Mauricio; Orozco Ordoñez, Iván
The open-pit coal mining in the La Guajira department has experienced significant growth in the last four decades, raising questions about the extent and consequences of vegetation loss in the region. The aim of this study is to conduct a multitemporal analysis of changes in vegetation cover in the El Cerrejón coal mines and surrounding areas from 1985 to 2023. By utilizing geospatial analysis techniques in the open-source software QGIS and satellite imagery from Landsat and Sentinel remote sensors, subsequently processed with the Semi-Automatic Classification Plugin (SCP), graphical outputs were obtained to quantify and evaluate historical changes in the study area, as well as understand the spatial and temporal behaviors of observed changes. This multitemporal analysis provides a deeper insight into the magnitude and dynamics of changes in vegetation cover due to mining exploitation. The results of this analysis are expected to contribute to a better understanding of the environmental impacts of extractive activities in the La Guajira department, providing essential information for environmental management decision-making. Likewise, it is anticipated that this study will serve as a scientific basis for the implementation of mitigation and ecological restoration strategies in areas affected by vegetation loss.
Análisis Multitemporal del Cambio en la Formación de Islas de Calor Urbano para el Municipio de Jamundí en el Valle Del Cauca Periodo (2015 – 2023)
(Universidad Santiago de Cali, 2024-08-10) Rojas Restrepo, Juan David; Escalante Caicedo, Ana Bely
The Municipality of Jamundí has experienced rapid urban growth in recent years, which has led to an increase in the formation of Urban Heat Islands (UHI) in areas with higher temperatures. However, the lack of understanding of the distribution of UHIs and their relationship with various factors hinders urban planning and affects the quality of life of the inhabitants. This study aims to analyze the spatial distribution of UHIs through a multi-temporal analysis, with an emphasis on their influence on the new urban lands defined by the local government. Using Geographic Information Systems (GIS), detailed maps of Land Surface Temperature (LST) were created, highlighting areas susceptible to the formation of Heat Islands. The study evaluated how changes in land use, coverage changes, and urban densification influence local temperatures. The analysis begins with the collection of data, including Landsat and Sentinel satellite images, ensuring the quality and relevance of the data for subsequent analyses. The creation of thematic maps uses free GIS software (QGIS) to visualize and analyze urban temperature variations, determining brightness temperatures, surface temperatures, and NDVI. The multi-temporal analysis of the municipality of Jamundí between 2015 and 2023 reveals a significant increase in the formation of Urban Heat Islands (UHI). In 2015, 90.98% of the study area was classified as "Weak." By 2023, this category decreased to 78.64%, while the "Moderately Weak" and "Moderately Strong" categories increased, reflecting the expansion of UHIs due to urban growth and vegetation reduction, as evidenced in the NDVI maps. The peripheral areas, initially with a high percentage of vegetation and lower temperatures, showed an increase in UHIs as urbanization progressed, especially in the northern and southeastern peripheral zones in 2023. Although the "Weak" areas remained relatively stable between 2019 and 2023, the "Moderate" and "Moderately Strong" categories experienced a significant increase, suggesting a growing trend towards higher temperatures in urbanized areas, with important implications for future urban planning and environmental management.
Aplicación de los SIG en el análisis multitemporal de cambios en la cobertura vegetal en la vereda las Guacas del municipio de Popayán en los años 2001, 2009 y 2019.
(Universidad Santiago de Cali, 2023-03-06) Fernández Noguera, Edwin Nayi; Rojas Montes, Javier Salvador
Modern society has generated environmental damage due to the overexploitation of natural resources, as evidenced by natural phenomena such as climate change on the planet. However, one of the main causes is the deforestation of forests and industrial activities in ecosystems that are fundamental for the survival of life, in this case, the activities are intensely observed in poor countries such as Asia, Africa and South America in the Amazon. As mentioned, the extractivist economic model has a negative impact on natural environments, for this reason, this research performs a multitemporal analysis with ArcGIS and Qgis software with which Landsat satellite images will be processed to structure the supervised classification for the years 2001, 2009 and 2019, thus, identifying the types and changes of coverage in the village of Las Guacas in the municipality of Popayán, but also, trying to determine the effects they cause in the middle basin of the Las Piedras River, which supplies the municipality of Popayán. With the results, it is intended to demonstrate the modifications in the study area, both positive and negative in the different forests, crops and the impacts that have been generated over time
Contribución para el conocimiento del escenario de riego mediante el análisis multitemporal de imágenes satelitales del río Cauca en el sector de Villa Paz, municipio de Jamundí
(Universidad Santiago de Cali, 2020) Guevara Garcés,Angie Vanessa; Melo Vargas, Andrés Felipe
The Cauca River is characterized by being sinuous and alluvial, which implies a great mobility of its channel; The sinuosity of a channel is the mechanism by which a river adjusts its slope when the valley through which it flows is greater than necessary, during its floods they favor the occurrence of floods of the lands used for socioeconomic activities and established villages that are in the banks of the river causing damage to the territory. (López JD, 2011) A contribution was made to the identification of risk setting, risk analysis and evaluation in the village of Villa Paz, and contributed to the Risk Awareness process that feeds the risk reduction and risk reduction processes. Disaster management, a research work is presented, the general objective of which was to analyze the dynamics of the Cauca River in the village of Villa Paz, Jamundí municipality, through the multitemporal observation of satellite images to identify risk setting. To do this, using current remote sensing techniques incorporated into geographic information systems, thematic maps were created with information from NASA satellite images and aerial photographs from the United States Geological Survey USGS; from sensors such as Modis, Globe and Landsat, obtained through the Google Earth Pro platform, and an analysis of the dynamics of the Cauca River was carried out in different periods of time, measuring the ranges and rates of annual displacement of its banks, and Establishing the movement vectors for the displacement of the riverbed, an analysis was also carried out on the threat of flooding in the study area. The results obtained in this work open very positive perspectives for the application of remote sensing in the orientation of strategies for risk monitoring and in the processes of formulating, executing, monitoring and evaluating risk management

Browse

Browsing Especialización en Sistemas de Información Geográfica by Subject "Análisis Multitemporal"

Results Per Page

Sort Options