Felipe Buill Pozuelo | Universitat Politecnica de Catalunya (original) (raw)
Papers by Felipe Buill Pozuelo
Mapping, 2008
Resumen: La técnica de barrido láser (láser scanning) en la que se emplean sensores terrestres es... more Resumen: La técnica de barrido láser (láser scanning) en la que se emplean sensores terrestres es relativamente nueva. Comparte con el láser escáner aerotransportado las ventajas de adquisición de cantidades masivas de puntos, con elevada precisión relativa ...
Survey Review, Jul 1, 2013
ABSTRACT Orthophotograph, orthoimages or orthophotomaps have become common and fundamental docume... more ABSTRACT Orthophotograph, orthoimages or orthophotomaps have become common and fundamental documents for urban planning, civil engineering projects, etc., by themselves or as a complement of geographic information systems. The success of these products, as opposed to topographic maps, lies in their facility in locating zones and buildings. This paper presents several digital elevation models (DEMs) obtained by photogrammetric correlation and shuttle radar topography mission (SRTM) models. Not only is the potential application of SRTM models analysed, but also their direct use and support to photogrammetric correlation. This process has been applied to several zones that differ in topography: plain, undulating, mountainous. As a result of the analysis, these models showed themselves to be useful in obtaining orthophotomaps accurate enough to work at medium to small scale in mapping, engineering projects, etc. They save time and money in the map production process and they are mainly used in engineering works and projects in developing areas that do not have any more accurate digital terrain model (DTM) available or the means to obtain them. Valid scales are analysed for each type of terrain. Likewise, DTMs would be very useful to obtain not only orthophotograph, but also rectified photographs in global applications for free distribution. A cost reduction study is also presented when these models are used as part of the digital photogrammetric process to obtain orthophotomaps.
Autocad magazine, 2006
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Survey Review, Mar 28, 2017
The management of large infrastructures requires comprehensive knowledge of their general charact... more The management of large infrastructures requires comprehensive knowledge of their general characteristics and the elements that constitute them. It is essential to know which elements are involved and where they are located. At the same time, it is vital to understand the overall geometry. The accuracy and precision required for both types of information is different: much greater accuracy is required in the understanding of the geometry. However, it is difficult to obtain this information about underground infrastructures due to their lighting characteristics, hazards, lack of GNSS (Global Navigation Satellite System) signals, and time available. In this case, to achieve the required quality in both tasks, the mobile mapping systems that are widely used in large surveys and urban inventories have to be adapted to obtain data in underground conditions. To achieve this, considerable geodesic support is necessary. The GNSS positioning system should be replaced by IMU sensors, and infrared sensor cameras are used, among other pieces of equipment. To establish the trajectory, additional information extracted from the targets detected in the laser scanning point clouds must be used. Therefore, a laser scanning and kinematic photogrammetry survey was carried out to obtain the centimetric precision and complete information that is still used today. This paper presents an adaptation of these systems for use in the Ferrocarril Metropolità de Barcelona.
El treball de camp s'ha fet dins del conveni de col•laboració entre l'
Proceedings of the 5th Joint International Symposium on Deformation Monitoring - JISDM 2022
When monitoring deformations in natural hazards such as rockfalls and landslides, the use of 3D m... more When monitoring deformations in natural hazards such as rockfalls and landslides, the use of 3D models has become a standard. Several geomatic techniques allow the generation of these models. However, each one has its pros and cons regarding accuracy, cost, sample frequency, etc. In this contribution a fixed-location time lapse camera system for continuous rockfall monitoring using photogrammetry has been developed as an alternative to Light Detection and Ranging (LiDAR) and ground-based interferometric synthetic-aperture radar (GB-InSAR). The usage of stereo photogrammetry allows the obtention of 3D points clouds at a low cost and with a high sample frequency, essential to detect premonitory displacements. In this work the designed system consists of three digital single-lens reflex (DSLR) cameras which collect photographs of the rock slope daily controlled by a Raspberry Pi computer using the open-source library gPhoto2. Photographs are automatically uploaded to a server using 3G ...
Remote Sensing
An automated, fixed-location, continuous time-lapse camera system was developed to analyze the ex... more An automated, fixed-location, continuous time-lapse camera system was developed to analyze the existence of rockfall precursory movements and quantify volume changes after detachments. It was implemented to monitor the basaltic formation on which Castellfollit de la Roca village is built. Due to the geometrical conditions of the area, the camera system consists of three digital cameras managed by a control unit that contains a Raspberry Pi 4 microprocessor. Images taken every day are sent to a server for processing. A workflow has been developed to work with a set of images with an irregular time interval to detect precursor movement. The first step consists of matching the images with a reference master image and filtering the vegetation to improve the process using a mask obtained by a green leaf index (GLI) index. Then, the adjusted images are used for a forward-backward correlation process carried out to detect movements. If movement is detected, a 3D model is built using struct...
<p>Debris flow and related processes strongly affect the morphology of head... more <p>Debris flow and related processes strongly affect the morphology of headwater catchments and deliver large amounts of sediments into the drainage network. The Rebaixader monitoring site, which is situated in the Central Pyrenees, is a perfect location to analyse different slope mass-wasting processes and to quantify the sediment yield in this headwater catchment. Two types of data are available: first, yearly photogrammetric surveys by Uncrewed Aerial Vehicle (UAV) have been performed since 2016, and second, an instrumental monitoring system is operational since 2009. Therefore, six years of data can be compared by these two approaches. While the UAV surveys produce point-clouds, Digital Surface Models (DSM) and orthophotos, the monitoring system determines the total volume of each torrential flow by flow-depth sensors, geophones and video cameras. Therefore, the volumes of the torrential flows determined by the instrumental monitoring system were compared and contrasted with those obtained from the DoD (Dem of differences) of photogrammetric reconstructions from UAV flights.</p><p>The final values of the sediment yield are between 0.1 and 0.2 m3/m2/y, which shows that this torrential catchment has a very high erosion activity.</p><p>The experience from this study shows that the applied monitoring techniques make it possible to i) quantify the sediment yield, ii) identify the different phenomena, and iii) determine the spatial distribution of each process. Regarding the UAV-datasets, the appropriateness of using DoD or advantages of comparing directly the different 3D point clouds are other conclusions derived from this study that will be discussed.</p>
Landslides, 2022
Fragmentation is a common feature of rockfall that exerts a strong control on the trajectories of... more Fragmentation is a common feature of rockfall that exerts a strong control on the trajectories of the generated blocks, the impact energies, and the runout. In this paper, we present a set of four real-scale rockfall tests aimed at studying the fragmentation of the rocky blocks, from the global design of the field procedure to the data analysis and the main results. A total of 124 limestone, dacite, or granite blocks ranging between 0.2 and 5 m3 were dropped from different heights (8.5 to 23.6 m) onto four slopes with different shapes (single or double bench) and slope angles (42º to 71º). The characteristics of the blocks, in particular the size, surface texture and joint condition, were measured before the drops. The trajectories of the blocks and both the initial and the impact velocities were tracked and recorded by means of three high-speed video cameras. A total of 200 block-to-ground impacts have been studied. On average, 40% of the blocks broke upon impact on the slope or on...
REDU. Revista de Docencia Universitaria, 2009
Se ha desarrollado una herramienta para que el estudiante, frente a un problema práctico que invo... more Se ha desarrollado una herramienta para que el estudiante, frente a un problema práctico que involucra varias asignaturas de la carrera, se enfrente a su resolución a partir de datos provenientes de observaciones virtuales, pueda consultar la teoría correspondiente a las diferentes materias que intervienen, realice los cálculos necesarios con ayuda de las herramientas matemáticas implementadas y compruebe el avance de su aprendizaje y el grado de comprensión de las materias mediante la resolución de tests de autoevaluación.
Torrential processes like debris flows and debris floods significantly change the morphology of h... more Torrential processes like debris flows and debris floods significantly change the morphology of high-mountain catchments. In addition, other types of mass movements and superficial erosion affect the landscape. In the present study, the mass-wasting in the Rebaixader catchment located in the Axial Pyrenees was quantified for a time span of more than 50 years by four different geomatic techniques: 1) Terrestrial Laser Scanning (TLS), 2) Airborne Laser Scanning (ALS), 3) Digital Photogrammetry from Historic Aerial Photographs (DP-HAP), and 4) Digital Photogrammetry from Unmanned Aerial Vehicle (DP-UAV). The Rebaixader catchment is characterized by a large open scarp with a very heterogeneous and irregular morphology. This scarp is situated in a side moraine and affected by many types of mass-wasting processes. The results of the geomatic techniques were compared and validated with the data gathered at the monitoring system, which was installed in 2009 in the channel reach below the sc...
Journal of Archaeological Science, 2013
ABSTRACT Graphic and metric information about the site and its environment and about the differen... more ABSTRACT Graphic and metric information about the site and its environment and about the different structures and artefacts located are indispensable for the optimal management of an archaeological excavation. A Geographic Information System (GIS) proves useful in managing and analysing information and data obtained from different sources. Two techniques of data capture, Terrestrial Laser Scanning (TLS) and close range photogrammetry, are used to generate accurate and high-resolution 3D models of a cave, the silos and a combustion structure at the Can Sadurní site (Begues, NE Spain). This site is especially noteworthy on account of its complete stratigraphy of the Catalonian Holocene. The capture and processing of the photogrammetric and TLS data used to generate 3D models are discussed in detail. These models cannot be obtained by classic archaeological techniques since the record is made layer by layer, approximately one decimetre apart, with the result that the information between the layers is lost. Our findings highlight the potential of these techniques for obtaining accurate and photorealistic models that facilitate a complete analysis of the available information at an archaeological site.
Mapping, 1999
Información del artículo Aplicaciones Fotogramétricas sobre IDL.
Autocad …, 2006
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
En el ano 1986 la ciudad de Alepo fue declarada Patrimonio de la Humanidad por la UNESCO, esta de... more En el ano 1986 la ciudad de Alepo fue declarada Patrimonio de la Humanidad por la UNESCO, esta declaracion fue el impulso necesario para las actuaciones de rehabilitacion del centro historico y de los monumentos que se encuentran en las inmediaciones. En este contexto y en colaboracion con el proyecto REHABIMED (rehabilitacion de la arquitectura tradicional mediterranea) y varios grupos de la ciudad de Alepo (Siria) se efectuaron los trabajos de levantamiento de la puerta de Antioquia de la muralla perimetral, efectuado con un sistema laser escaner terrestre de la casa Riegl. Una de las etapas mas importante previa a cualquier intervencion de restauracion es la determinacion del estado actual del objeto de estudio, que permitira documentar, estudiar y analizar de forma correcta el monumento o edificio. Hoy la tecnologia permite documentar de una manera rapida y exhaustiva la informacion espacial necesaria para las distintas actuaciones a efectuar en el patrimonio arquitectonico. Den...
International Society for Soil Mechanics and Geotechnical Engineering Online Library: 13th International Symposium on Landslides ( XIII ISL), 2021
Mapping, 2008
Resumen: La técnica de barrido láser (láser scanning) en la que se emplean sensores terrestres es... more Resumen: La técnica de barrido láser (láser scanning) en la que se emplean sensores terrestres es relativamente nueva. Comparte con el láser escáner aerotransportado las ventajas de adquisición de cantidades masivas de puntos, con elevada precisión relativa ...
Survey Review, Jul 1, 2013
ABSTRACT Orthophotograph, orthoimages or orthophotomaps have become common and fundamental docume... more ABSTRACT Orthophotograph, orthoimages or orthophotomaps have become common and fundamental documents for urban planning, civil engineering projects, etc., by themselves or as a complement of geographic information systems. The success of these products, as opposed to topographic maps, lies in their facility in locating zones and buildings. This paper presents several digital elevation models (DEMs) obtained by photogrammetric correlation and shuttle radar topography mission (SRTM) models. Not only is the potential application of SRTM models analysed, but also their direct use and support to photogrammetric correlation. This process has been applied to several zones that differ in topography: plain, undulating, mountainous. As a result of the analysis, these models showed themselves to be useful in obtaining orthophotomaps accurate enough to work at medium to small scale in mapping, engineering projects, etc. They save time and money in the map production process and they are mainly used in engineering works and projects in developing areas that do not have any more accurate digital terrain model (DTM) available or the means to obtain them. Valid scales are analysed for each type of terrain. Likewise, DTMs would be very useful to obtain not only orthophotograph, but also rectified photographs in global applications for free distribution. A cost reduction study is also presented when these models are used as part of the digital photogrammetric process to obtain orthophotomaps.
Autocad magazine, 2006
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
Survey Review, Mar 28, 2017
The management of large infrastructures requires comprehensive knowledge of their general charact... more The management of large infrastructures requires comprehensive knowledge of their general characteristics and the elements that constitute them. It is essential to know which elements are involved and where they are located. At the same time, it is vital to understand the overall geometry. The accuracy and precision required for both types of information is different: much greater accuracy is required in the understanding of the geometry. However, it is difficult to obtain this information about underground infrastructures due to their lighting characteristics, hazards, lack of GNSS (Global Navigation Satellite System) signals, and time available. In this case, to achieve the required quality in both tasks, the mobile mapping systems that are widely used in large surveys and urban inventories have to be adapted to obtain data in underground conditions. To achieve this, considerable geodesic support is necessary. The GNSS positioning system should be replaced by IMU sensors, and infrared sensor cameras are used, among other pieces of equipment. To establish the trajectory, additional information extracted from the targets detected in the laser scanning point clouds must be used. Therefore, a laser scanning and kinematic photogrammetry survey was carried out to obtain the centimetric precision and complete information that is still used today. This paper presents an adaptation of these systems for use in the Ferrocarril Metropolità de Barcelona.
El treball de camp s'ha fet dins del conveni de col•laboració entre l'
Proceedings of the 5th Joint International Symposium on Deformation Monitoring - JISDM 2022
When monitoring deformations in natural hazards such as rockfalls and landslides, the use of 3D m... more When monitoring deformations in natural hazards such as rockfalls and landslides, the use of 3D models has become a standard. Several geomatic techniques allow the generation of these models. However, each one has its pros and cons regarding accuracy, cost, sample frequency, etc. In this contribution a fixed-location time lapse camera system for continuous rockfall monitoring using photogrammetry has been developed as an alternative to Light Detection and Ranging (LiDAR) and ground-based interferometric synthetic-aperture radar (GB-InSAR). The usage of stereo photogrammetry allows the obtention of 3D points clouds at a low cost and with a high sample frequency, essential to detect premonitory displacements. In this work the designed system consists of three digital single-lens reflex (DSLR) cameras which collect photographs of the rock slope daily controlled by a Raspberry Pi computer using the open-source library gPhoto2. Photographs are automatically uploaded to a server using 3G ...
Remote Sensing
An automated, fixed-location, continuous time-lapse camera system was developed to analyze the ex... more An automated, fixed-location, continuous time-lapse camera system was developed to analyze the existence of rockfall precursory movements and quantify volume changes after detachments. It was implemented to monitor the basaltic formation on which Castellfollit de la Roca village is built. Due to the geometrical conditions of the area, the camera system consists of three digital cameras managed by a control unit that contains a Raspberry Pi 4 microprocessor. Images taken every day are sent to a server for processing. A workflow has been developed to work with a set of images with an irregular time interval to detect precursor movement. The first step consists of matching the images with a reference master image and filtering the vegetation to improve the process using a mask obtained by a green leaf index (GLI) index. Then, the adjusted images are used for a forward-backward correlation process carried out to detect movements. If movement is detected, a 3D model is built using struct...
<p>Debris flow and related processes strongly affect the morphology of head... more <p>Debris flow and related processes strongly affect the morphology of headwater catchments and deliver large amounts of sediments into the drainage network. The Rebaixader monitoring site, which is situated in the Central Pyrenees, is a perfect location to analyse different slope mass-wasting processes and to quantify the sediment yield in this headwater catchment. Two types of data are available: first, yearly photogrammetric surveys by Uncrewed Aerial Vehicle (UAV) have been performed since 2016, and second, an instrumental monitoring system is operational since 2009. Therefore, six years of data can be compared by these two approaches. While the UAV surveys produce point-clouds, Digital Surface Models (DSM) and orthophotos, the monitoring system determines the total volume of each torrential flow by flow-depth sensors, geophones and video cameras. Therefore, the volumes of the torrential flows determined by the instrumental monitoring system were compared and contrasted with those obtained from the DoD (Dem of differences) of photogrammetric reconstructions from UAV flights.</p><p>The final values of the sediment yield are between 0.1 and 0.2 m3/m2/y, which shows that this torrential catchment has a very high erosion activity.</p><p>The experience from this study shows that the applied monitoring techniques make it possible to i) quantify the sediment yield, ii) identify the different phenomena, and iii) determine the spatial distribution of each process. Regarding the UAV-datasets, the appropriateness of using DoD or advantages of comparing directly the different 3D point clouds are other conclusions derived from this study that will be discussed.</p>
Landslides, 2022
Fragmentation is a common feature of rockfall that exerts a strong control on the trajectories of... more Fragmentation is a common feature of rockfall that exerts a strong control on the trajectories of the generated blocks, the impact energies, and the runout. In this paper, we present a set of four real-scale rockfall tests aimed at studying the fragmentation of the rocky blocks, from the global design of the field procedure to the data analysis and the main results. A total of 124 limestone, dacite, or granite blocks ranging between 0.2 and 5 m3 were dropped from different heights (8.5 to 23.6 m) onto four slopes with different shapes (single or double bench) and slope angles (42º to 71º). The characteristics of the blocks, in particular the size, surface texture and joint condition, were measured before the drops. The trajectories of the blocks and both the initial and the impact velocities were tracked and recorded by means of three high-speed video cameras. A total of 200 block-to-ground impacts have been studied. On average, 40% of the blocks broke upon impact on the slope or on...
REDU. Revista de Docencia Universitaria, 2009
Se ha desarrollado una herramienta para que el estudiante, frente a un problema práctico que invo... more Se ha desarrollado una herramienta para que el estudiante, frente a un problema práctico que involucra varias asignaturas de la carrera, se enfrente a su resolución a partir de datos provenientes de observaciones virtuales, pueda consultar la teoría correspondiente a las diferentes materias que intervienen, realice los cálculos necesarios con ayuda de las herramientas matemáticas implementadas y compruebe el avance de su aprendizaje y el grado de comprensión de las materias mediante la resolución de tests de autoevaluación.
Torrential processes like debris flows and debris floods significantly change the morphology of h... more Torrential processes like debris flows and debris floods significantly change the morphology of high-mountain catchments. In addition, other types of mass movements and superficial erosion affect the landscape. In the present study, the mass-wasting in the Rebaixader catchment located in the Axial Pyrenees was quantified for a time span of more than 50 years by four different geomatic techniques: 1) Terrestrial Laser Scanning (TLS), 2) Airborne Laser Scanning (ALS), 3) Digital Photogrammetry from Historic Aerial Photographs (DP-HAP), and 4) Digital Photogrammetry from Unmanned Aerial Vehicle (DP-UAV). The Rebaixader catchment is characterized by a large open scarp with a very heterogeneous and irregular morphology. This scarp is situated in a side moraine and affected by many types of mass-wasting processes. The results of the geomatic techniques were compared and validated with the data gathered at the monitoring system, which was installed in 2009 in the channel reach below the sc...
Journal of Archaeological Science, 2013
ABSTRACT Graphic and metric information about the site and its environment and about the differen... more ABSTRACT Graphic and metric information about the site and its environment and about the different structures and artefacts located are indispensable for the optimal management of an archaeological excavation. A Geographic Information System (GIS) proves useful in managing and analysing information and data obtained from different sources. Two techniques of data capture, Terrestrial Laser Scanning (TLS) and close range photogrammetry, are used to generate accurate and high-resolution 3D models of a cave, the silos and a combustion structure at the Can Sadurní site (Begues, NE Spain). This site is especially noteworthy on account of its complete stratigraphy of the Catalonian Holocene. The capture and processing of the photogrammetric and TLS data used to generate 3D models are discussed in detail. These models cannot be obtained by classic archaeological techniques since the record is made layer by layer, approximately one decimetre apart, with the result that the information between the layers is lost. Our findings highlight the potential of these techniques for obtaining accurate and photorealistic models that facilitate a complete analysis of the available information at an archaeological site.
Mapping, 1999
Información del artículo Aplicaciones Fotogramétricas sobre IDL.
Autocad …, 2006
Acceso de usuarios registrados. Acceso de usuarios registrados Usuario Contraseña. ...
En el ano 1986 la ciudad de Alepo fue declarada Patrimonio de la Humanidad por la UNESCO, esta de... more En el ano 1986 la ciudad de Alepo fue declarada Patrimonio de la Humanidad por la UNESCO, esta declaracion fue el impulso necesario para las actuaciones de rehabilitacion del centro historico y de los monumentos que se encuentran en las inmediaciones. En este contexto y en colaboracion con el proyecto REHABIMED (rehabilitacion de la arquitectura tradicional mediterranea) y varios grupos de la ciudad de Alepo (Siria) se efectuaron los trabajos de levantamiento de la puerta de Antioquia de la muralla perimetral, efectuado con un sistema laser escaner terrestre de la casa Riegl. Una de las etapas mas importante previa a cualquier intervencion de restauracion es la determinacion del estado actual del objeto de estudio, que permitira documentar, estudiar y analizar de forma correcta el monumento o edificio. Hoy la tecnologia permite documentar de una manera rapida y exhaustiva la informacion espacial necesaria para las distintas actuaciones a efectuar en el patrimonio arquitectonico. Den...
International Society for Soil Mechanics and Geotechnical Engineering Online Library: 13th International Symposium on Landslides ( XIII ISL), 2021