Estudio comparativo de la evolución de cárcavas mediante técnicas de fotogrametría y LIDAR RPAS
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2024-01-08
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Jaén: Universidad de Jaén
Resumen
La erosión por cárcavas es uno de los principales problemas de degradación medioambiental de los suelos que provoca pérdidas muy importantes en las zonas afectadas. Por ello resulta muy importante, y es objetivo de este trabajo, la monitorización y cuantificación de los cambios producidos en la superficie del terreno debido a estos procesos. El presente estudio se ha realizado en una zona de olivar de la provincia de Jaén, utilizando técnicas geomáticas. Específicamente se emplean fotogrametría y LiDAR de muy alta resolución, a partir de imágenes capturadas con RPAS, comparando los MDS obtenidos por ambas técnicas de captura y los MDT obtenidos tras procesos de clasificación y filtrado. Los resultados muestran una evolución que implica un descenso medio del terreno de varios cm y pérdidas de centenares de m3 en la zona de las cárcavas. Además, se observan diferencias importantes entre los distintos modelos de superficie y terreno, generalmente derivadas del mayor poder de penetración del LiDAR respecto a las
imágenes.
Gully erosion is one of the main problems of environmental degradation of soils that causes very significant losses in the affected areas. Therefore, it is very important, and it is the objective of this work, to monitor and quantify the changes produced in the ground surface due to these processes. The present study has been carried out in an area of olive groves in the province of Jaén, using geomatic techniques. Specifically, very high resolution photogrammetry and LiDAR are used, from images captured with RPAS, comparing the DSM obtained by both capture techniques and the DTM after classification and filtering processes. The results show an evolution that implies an average ground descent of several cm and losses of hundreds of m3 in the area of the gullies. In addition, important differences are observed between the different surface and terrain models, generally derived from the greater penetration power of LiDAR compared to images.
Gully erosion is one of the main problems of environmental degradation of soils that causes very significant losses in the affected areas. Therefore, it is very important, and it is the objective of this work, to monitor and quantify the changes produced in the ground surface due to these processes. The present study has been carried out in an area of olive groves in the province of Jaén, using geomatic techniques. Specifically, very high resolution photogrammetry and LiDAR are used, from images captured with RPAS, comparing the DSM obtained by both capture techniques and the DTM after classification and filtering processes. The results show an evolution that implies an average ground descent of several cm and losses of hundreds of m3 in the area of the gullies. In addition, important differences are observed between the different surface and terrain models, generally derived from the greater penetration power of LiDAR compared to images.