Monitorización de laderas inestables mediante técnicas fotogramétricas a partir de vuelos UAV e históricos

Published on May 19, 2014
T. Fernández13
Estimated H-index: 13
(University of Jaén),
J. L. Pérez7
Estimated H-index: 7
(University of Jaén)
+ 3 AuthorsJ. Delgado8
Estimated H-index: 8
(University of Jaén)
Sources
Abstract
Este trabajo presenta una metodologia para la monitorizacion de laderas inestables mediante tecnicas fotogrametricas, partiendo de vuelos UAV de muy alta resolucion. Para ello se han realizado y analizado cuatro campanas de UAV desde noviembre de 2012 en una zona situada en las inmediaciones de la Guardia (Jaen), y ademas se ha utilizado un vuelo fotogrametrico previo de la misma zona. Los vuelos UAV se han realizado mediante una plataforma aerea ligera de tipo helicoptero o drone �provisto de GPS, sistema inercial y 8 rotores-, volando a 90 m de altura para cubrir una zona de unos 250 x 100 m con un tamano de pixel centimetrico (2,5 cm). La orientacion de los vuelos UAV se ha llevado a cabo mediante puntos de control medidos sobre el terreno con GPS, mientras que en los vuelos previos se han utilizado los parametros de orientacion directa y puntos de control de segundo orden, extraidos del ultimo vuelo UAV que se toma como referencia. Los MDS de todas las campanas se han obtenido por correlacion automatica y posteriormente se han calculado los modelos diferenciales, lo que permitio estimar visualmente los cambios de la superficie. Al mismo tiempo se han obtenido las ortofotografias sobre las que se han medido los desplazamientos horizontales y verticales entre puntos relevantes del terreno. Se observan desplazamientos importantes entre algunas campanas (de orden centimetrico en la componente vertical y metrico en la horizontal) y proximos a 0 entre otras. Finalmente, se ha analizado la relacion con las lluvias de los ultimos anos en la zona, encontrandose una correlacion temporal significativa entre ambos fenomenos.
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