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.
Abstract The development of surface fissures is an important indicator for understanding and forecasting slope movements. Landslide investigations therefore frequently include the elaboration and interpretation of maps representing their spatial distribution, typically comprising intensive field work and instrumentation. It is only recently that aerial photography with sub-decimetre spatial resolution is becoming more commonly available and opens a window to analyse such features from a remote s...
#2Jorge Jiménez(UGR: University of Granada)H-Index: 3
Last. J. Chacón(UGR: University of Granada)H-Index: 17
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In this work a methodology for preparing landslides susceptibility and hazard maps is presented, based in a bivariate analysis between past movements and determinant factors. The methodology for determining the susceptibility is an adaptation of the matrix method to a GIS, and it has been tested and validated in different zones and environments of Andalusia (southern Spain). The text also discusses the availability of information layers in Spanish SDI to developing these susceptibility maps. For...
After the operation of GPS/IMU direct geo-referencing, segmentation, filtering, classification of scattered point data and aerial triangulation on airborne LiDAR(Light Detection and Ranging) data, the accurate and high-resolution DEM of the study area in the west part of Zengcheng city, Guangdong, China was constructed. In addition, unmanned aerial vehicle (UAV) images were used for ground objects identification. Landslides occur frequently in summer in the city because of heavy rainfall. The Li...
Jun 18, 2010 in GEOINFORMATICS (International Conference on Geoinformatics)
#1Jiayuan Lin(CAS: Chinese Academy of Sciences)H-Index: 4
#2Heping Tao(CAS: Chinese Academy of Sciences)H-Index: 4
Last. Zhou Huang(PKU: Peking University)H-Index: 12
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Mountain disasters like landslides occur frequently in Southwest China. Hence, it is urgent to timely conduct geological survey in disastrous region and take necessary measures to treat identified hazards. Field survey is reliable but too expensive and time-consuming. Satellite or manned aerial remote sensing have the advantages of region-scale coverage and moderate timeliness, but restricted by the factors of mist, image resolution, human safety, and cost. Unmanned Aerial Vehicle (UAV) remote s...
The slope movement at Sedrun (Switzerland) has been studied with ortho-rectified images. Displacement maps compiled for two periods (1973–1990 and 1990–2003), based on a correlation of the aerial images indicate maximum average slope movements of 60 cm/year, similar to those obtained by traditional photogrammetry over the period 1973–1990. The limits of the most active zones determined by image correlation correspond to those obtained by fieldwork. Comparison of the two displacement maps shows a...
#2Lisa Borgatti(UNIBO: University of Bologna)H-Index: 15
Last. P. Sterzai(National Institute of Oceanography, India)H-Index: 7
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Abstract. This paper deals with the use of time-series of High-Resolution Digital Elevation Models (HR DEMs) obtained from photogrammetry and airborne LiDAR coupled with aerial photos, to analyse the magnitude of recently reactivated large scale earth slides – earth flows located in the northern Apennines of Italy. The landslides underwent complete reactivation between 2001 and 2006, causing civil protection emergencies. With the final aim to support hazard assessment and the planning of mitigat...
Last. Alain Demoulin(National Fund for Scientific Research)H-Index: 19
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Abstract The study of small and/or slow reactivations of landslides requires describing their displacements over decades, which may be done with accurate multi-temporal digital terrain models (DTMs). We applied aerial stereophotogrammetry to build the historical topographies of old deep-seated landslides close to Oudenaarde in the Flemish Ardennes (West Belgium) at different dates. Three precise aerotriangulations (1996, 1973, 1952) were carried out. After capturing the ground data manually from...
A fairly complete range of slope movement processes are identified and classified according to features that are also to some degree relevant to their recognition, avoidance, control, or correction. The classification includes extremely slow distributed movements of both rock and soil (designated as creep in many classifications). The classification also includes the increasingly recognized overturning or toppling failures and spreading movements. Attention is also paid to movements due to freez...
This paper presents a methodology for slope instability monitoring using photogrammetric techniques with very high resolution images from an unmanned aerial vehicle (UAV). An unstable area located in La Guardia (Jaen, Southern Spain), where an active mud flow has been identified, was surveyed between 2012 and 2014 by means of four UAV flights. These surveys were also compared with those data from a previous conventional aerial photogrammetric and LiDAR survey. The UAV was an octocopter equipped ...
