Search results for "GIS"
showing 10 items of 7190 documents
La enseñanza-aprendizaje del agua en el contexto de un desarrollo sostenible. Su aplicación en la enseñanza secundaria
2007
Durante mucho tiempo se ha actuado como si los recursos naturales fueran realmente ilimitados y el hombre se ha dedicado a su explotación de forma absolutamente irracional, en la mayoría de los casos para la obtención de bienes de consumo", (OCDE, 1984). Esta actitud expoliadora de nuestra sociedad ha producido su escasez en nuestro planeta y un deterioro de la calidad de vida. Como consecuencia del mal llamado "progreso" y del "desarrollo tecnológico", existen altos índices de contaminación tanto en el aire, como en el suelo y en el agua, al tiempo que la población mundial crece de forma desmesurada. Uno de los recursos que está siendo esquilmado, aunque sea renovable, es el agua, por ello…
Planificación, puesta en práctica y evaluación de la enseñanza problematizada sobre la luz y la visión en la educación secundaria obligatoria.
2007
La planificación de la enseñanza problematizada de la Óptica Geométrica en los niveles de ESO ha supuesto a tomar decisiones sobre el objetivo clave, el problema estructurante, las metas parciales, los obstáculos asociados y la secuencia de actividades para el aula.Tras una revisión histórica de las ideas científicas en este campo y de la investigación didáctica sobre el tema, se ha identificado que el objetivo-clave a conseguir es la comprensión y uso funcional del modelo de visión de Kepler, el modelo más sencillo y con suficiente capacidad explicativa y predictiva para que merezca la pena enseñarlo a todas las personas.Según este estudio histórico y epistemológico, conseguir que los alum…
Toward a real-time tracking of dense point-sampled geometry
2012
4 pages; International audience; In this paper, we address the problem of tracking temporal deformations between two arbitrary densely sampled point-based surfaces. We propose an intuitive and efficient resolution to the point matching problem within two frames of a sequence. The proposed method utilizes two distinct space partition trees, one for each point cloud, which both are defined on a unique discrete space. Our method takes advantage of multi-resolution concerns, voxel adjacency relations, and a specific distance function. Experimental results obtained from both simulated and real reconstructed data sets demonstrate that the proposed method can handle efficiently the tracking proces…
SAMSLAM: Simulated Annealing Monocular SLAM
2013
This paper proposes a novel monocular SLAM approach. For a triplet of successive keyframes, the approach inteleaves the registration of the three 3D maps associated to each image pair in the triplet and the refinement of the corresponding poses, by progressively limiting the allowable reprojection error according to a simulated annealing scheme. This approach computes only local overlapping maps of almost constant size, thus avoiding problems of 3D map growth. It does not require global optimization, loop closure and back-correction of the poses.
Exploiting Low-Cost 3D Imagery for the Purposes of Detecting and Analyzing Pavement Distresses
2020
Road pavement conditions have significant impacts on safety, travel times, costs, and environmental effects. It is the responsibility of road agencies to ensure these conditions are kept in an acceptable state. To this end, agencies are tasked with implementing pavement management systems (PMSs) which effectively allocate resources towards maintenance and rehabilitation. These systems, however, require accurate data. Currently, most agencies rely on manual distress surveys and as a result, there is significant research into quick and low-cost pavement distress identification methods. Recent proposals have included the use of structure-from-motion techniques based on datasets from unmanned a…
Sistemi informativi 3D per i BB.CC. e l'archeologia: il Castello di Maredolce a Palermo
2014
Il mondo della ricerca nel campo dei BB.CC. sta guardando con sempre maggior interesse all’uso di tecnologie informatiche integrate, che consentano di fornire e condividere in rete dati quantitativi e qualitativi, geometrici, posizionali, alfanumerici, relativi ai BB.CC., sfruttando l’interazione tra banche dati e modelli 3D. Tali modelli, dunque, oltre a fornire una ricostruzione virtuale del monumento con la possibilità di navigare ed analizzare l’oggetto in dettaglio, costituiscono lo strumento per accedere ad informazioni eterogenee (testi, immagini, sequenze video, ecc.) sui manufatti, raccolte ed organizzate in database relazionali interrogabili, al fine di una piena comprensione e co…
Towards Digital Twinning on the Web: Heterogeneous 3D Data Fusion Based on Open-Source Structure
2023
Recent advances in Computer Science and the spread of internet connection have allowed specialists to virtualize complex environments on the web and offer further information with realistic exploration experiences. At the same time, the fruition of complex geospatial datasets (point clouds, Building Information Modelling (BIM) models, 2D and 3D models) on the web is still a challenge, because usually it involves the usage of different proprietary software solutions, and the input data need further simplification for computational effort reduction. Moreover, integrating geospatial datasets acquired in different ways with various sensors remains a challenge. An interesting question, in that r…
Localization of 2D Cameras in a Known Environment Using Direct 2D-3D Registration
2014
International audience; In this paper we propose a robust and direct 2D-to- 3D registration method for localizing 2D cameras in a known 3D environment. Although the 3D environment is known, localizing the cameras remains a challenging problem that is particularly undermined by the unknown 2D-3D correspondences, outliers, scale ambiguities and occlusions. Once the cameras are localized, the Structure-from-Motion reconstruction obtained from image correspondences is refined by means of a constrained nonlinear optimization that benefits from the knowledge of the scene. We also propose a common optimization framework for both localization and refinement steps in which projection errors in one v…
Reforma local, crisi i deute, els mercats de la gestió privada de serveis, competències i la desaparició efectiva de l autonomia local
2014
SEMINARI DE LA FACULTAT DE DRET DE VALÈNCIA: - Novembre (27/11/2013): Reforma local, crisi i deute, els mercats de la gestió privada de serveis, competències i la desaparició efectiva de l autonomia localPonent: Andrés Boix Palop (Dret administratiu, Universitat de València).[Ponència: Anàlisi del projecte de reforma local en clau econòmica, competencial i dautonomia local]
Entrevista Toni Ferrer
2014
Entrevista Toni Ferrer