Examinando por Materia "PlanetScope"

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    PublicaciónAcceso abierto
    Análisis de la variación de la superfice del complejo cenagoso del bajo Sinú para las temporadas estacionales del año 2021 a partir de imágenes satelitales planetscope
    (2023-08-01) Payares Narváez, Fabián Enrique; Mejía Ávila, Doris; Martínez Lara , Zoraya
    The degradation of wetlands impacts the ecosystem services they provide, especially the capacity for water regulation and flood control, which is considered by Ricaurte, et al. (2017) as one of the most important services provided by these ecosystems. As a result of this problem, studies have been carried out in the aforementioned ecosystems, in order to know the location of wetlands and support land-use planning and disaster prevention policies in the departments and municipalities of the country (Patiño, 2016). As a consequence of the degradation suffered by these ecosystems in Colombia and the lack of an updated and accurate inventory, several authors agree that the delimitation at a precise and detailed scale of wetlands is a fundamental and necessary tool to establish strategies for the preservation, protection and conservation of their ecosystem services; especially for the preservation of their water regulation conditions (Baker, C. et al., 2006), (Brena, Castillo, and Wagner, 2016), (Patiño, 2016). Therefore, the general objective of this work is to know the spatial variation of the Bajo Sinú Cenotage Complex during its seasonal periods for the year 2021. The methodology employs the use of PlanetScope satellite images through spectral indices, with the purpose of establishing a categorization of the spectral ranges of the different analysis coverages present in the Lower Sinú swamp complex and, in this way, to verify the individualization capacity of these study classes. In response to the methodology used and the results obtained, it was possible to generate a cartography of the different coverages associated to the CCBS at a higher level of detail than the one usually used (1:10 000), as well as the calculation of the total areas of the wetlands corresponding to the complex, including their floating aquatic vegetation coverages.
  • Miniatura
    PublicaciónAcceso abierto
    Identificación de la huella dejada por la minería de oro en un sector de la cuenca del río San Jorge para el periodo 2010-2020, a partir del uso de imágenes satelitales de media y alta resolución
    (2022-11-18) Sánchez López, Anyis Caterine; Mejía Ávila, Doris
    A study of the footprint left by gold mining was carried out through a multitemporal analysis of the upper and lower (middle) basin of the San Jorge River, located in the northernmost area, of the South American plate in the jurisdiction of the departments of Antioquia and Cordova. The evaluation period of the analysis was 10 years, between 2010 and 2020. The general objective of this research work was to identify the footprint left by open-pit gold mining in a sector of the San Jorge river basin for the period 2010 -2020, through the visual interpretation of medium and highresolution images. For which, different geoprocessing tools and cartographic processes were implemented such as photointerpretation, treatment and analysis of satellite images such as Rapid Eye, PlanetScope, Landsat 7 and Sentinel 2, using the Qgis and ArcMap software. This study determined that in the period 2010-2020 there was a mining footprint of 9.429,057 hectares (ha) in the area under study. The low-medium account of the San Jorge River was the most affected with 8451.55 hectares (ha), especially the sub-basin of the Ciénaga de Ayapel with an intervened area of 7197.81 ha, which implies that at least 18 % of its territory has been in contact with gold mining, highlighting the micro-basins; Monteadero, Escobilla, Trejos, Quebradona and Popales. On the other hand, this work shows that at a general level the period with the greatest growth dynamics was 2010-2015, on the contrary, the 2015-2020 period showed greater stability in the growth of the areas affected by said activity.
  • Miniatura
    PublicaciónAcceso abierto
    Potencialidad de las imágenes planetscope para diferenciar vegetación en ecosistemas cenagosos tropicales caso de aplicación: sector ciénaga guartinaja del complejo cenagoso del bajo Sinú
    (2023-08-30) Florez Alcala, Julio Cesar; Mejía Ávila, Doris; Martínez Lara, Zoraya Yasquine
    Este trabajo de investigación busca evaluar la potencialidad de las imágenes de alta resolución espacial y temporal generadas por la constelación PlanetScope para diferenciar tipos de cobertura vegetal en el ecosistema cenagoso tropical Ciénaga Guartinaja, para ello se realizaron dos muestreos en campo en periodos de nivel de aguas medias y aguas bajas, que permitan obtener información primaria de las coberturas vegetales presentes en la ciénaga. Se extrajo de literatura científica un conjunto de 50 índices de vegetación, el cual se sometió a un análisis de separabilidad con el estadístico de distancia euclidiana para reducirlo a 20 índices. La selección de él o los mejores índices se realizó a partir del método para evaluación de la eficiencia de índices espectrales para el mapeo de ciénagas tropicales – SIA_WM. Los índices SAVI (L 0.5) y EVI fueron los mejor calificados, por tanto, a partir de estos se construyó la cartografía de la Ciénaga Guartinaja para las dos temporadas estacionales: seca y húmeda. Por otra parte, la aplicación de SIA_WM permitió separar coberturas como el espejo de agua, la vegetación y la superficie terrestre, sin embargo, no fue posible separar las coberturas de buchón, de guandú y de hierba de arroz.