11 research outputs found
Determinación del eje de la carretera y la distancia de visibilidad utilizando datos GPS y herramientas SIG
Hoy en día, tanto en el proceso de diseño de las carreteras como en el análisis del funcionamiento de las ya
construidas, se está dando cada vez más importancia a la seguridad vial. Entre los distintos aspectos que se
consideran se encuentra la distancia de visibilidad. Por otra parte, uno de los problemas que aparecen en la práctica
al tratar de analizar carreteras en servicio es la falta de datos de la geometría del eje que estén actualizados y
tengan la precisión requerida. En esta comunicación se presenta un procedimiento para determinar el eje de la
carretera mediante información GPS y calcular la distancia de visibilidad aplicando herramientas SIG. El
procedimiento se ha aplicado a un tramo de carretera convencional de doble sentido de circulación.
El método propuesto puede ser especialmente útil en aquellas carreteras en servicio y de las que, por no contar
con la información sobre su trazado (original o posteriores modificaciones), no es posible utilizar los programas de
diseño de carreteras para el cálculo de la distancia de visibilidad.Nowadays road safety aspects are very important, both for the designing process and for the analysis of already
built roads. Sight distance is one of the most important road safety aspects to consider. On the other hand, the
geometric definition of already built roads is one of the most difficult issues that arise in practice. This road geometry
must be accurate and up to date. In this paper, a procedure to determine the alignment of a road using a GPS and to
calculate sight distances using GIS tools is presented. Also, the use of this procedure in a two-lane rural road is
described.
The proposed method can be especially useful for those roads whose design data are not available because, on
them, road design software could not be used for sight distance calculation
VETTONIA PROJECT: A VIRTUAL ENVIRONMENT FOR THE EDUCATIONAL DISSEMINATION OF THE IRON AGE
The VETTONIA project aims to disseminate the rich heritage from the Iron Age of the western Iberian Peninsula and the archaeological investigations carried out on this topic in recent years. The project utilizes new technologies such as virtual tours, 3D models, and impressions to create interactive and stimulating ways to access the results of the most recent archaeological research. Using these resources, lectures and seminars are being given in various forums with diverse types of audiences to present the virtual tours and the rest of the dissemination initiatives. In addition, the project presents its different initiatives during the annual archaeological interventions developed in the oppidum of Ulaca (Solosancho, Ávila, Spain), with good reception by the attending public. The VETTONIA project represents a pioneering dissemination experience that takes advantage of the educational opportunities offered by new technologies. In the future, tools such as virtual tours to archaeological sites may prove essential in classroom teaching at different levels and could promote sustainable tourism in fragile natural environments such as those that constitute the major settlements of the Late Iron Age (ca. 400–50 BC)
Integración de procesos de fotogrametría en sistemas de tratamiento de la información raster y vectorial
The correlation methods presented here use 3D image processing techniques to set up virtual stereo models and integrate them in spatial digital information systems. The coordinates of any selected point are made available more accurately than by methods of photogrammetric restitution, and the user requires no training in stereoscopy. The metrical and documentary information generated here, in comparison with what is current, is better suited for the development of geo-spatial engineering projects. It is also of a quality to improve the execution of projects using automatic machinery. The developed techniques enable the project designer to build his data base interactively as part of the geometric design process.Los procesos de correlación que se presentan tienen como objetivo configurar estéreo-modelos virtuales y su integración en sistemas de información mediante técnicas de tratamiento de imágenes en modo 3D. El resultado de estos desarrollos permite calcular las coordenadas de los puntos, directamente seleccionados por el usuario, con un nivel de precisión superior al que se obtiene en los métodos de restitución fotogramétrica y sin necesidad de un adiestramiento previo en estereoscopía. Estos procedimientos generan una información métrica y documental más adecuada para la elaboración del proyecto y contribuyen a mejorar la ejecución de obras con maquinas automáticas. Poder configurar la base de datos de forma interactiva con el diseño geométrico del proyecto es la conclusión más relevante de estos desarrollos
Integrating photogrammetry into raster and vector information systems for setting databases for engineering projects
Multisensor Data Fusion by Means of Voxelization: Application to a Construction Element of Historic Heritage
Point clouds are very common tools used in the work of documenting historic heritage buildings. These clouds usually comprise millions of unrelated points and are not presented in an efficient data structure, making them complicated to use. Furthermore, point clouds do not contain topological or semantic information on the elements they represent. Added to these difficulties is the fact that a variety of different kinds of sensors and measurement methods are used in study and documentation work: photogrammetry, LIDAR, etc. Each point cloud must be fused and integrated so that decisions can be taken based on the total information supplied by all the sensors used. A system must be devised to represent the discrete set of points in order to organise, structure and fuse the point clouds. In this work we propose the concept of multispectral voxels to fuse the point clouds, thus integrating multisensor information in an efficient data structure, and applied it to the real case of a building element in an archaeological context. The use of multispectral voxels for the fusion of point clouds integrates all the multisensor information in their structure. This allows the use of very powerful algorithms such as automatic learning and machine learning to interpret the elements studied. © 2022 by the authors
Minimal disease activity (MDA) in patients with recent-onset psoriatic arthritis : predictive model based on machine learning
Very few data are available on predictors of minimal disease activity (MDA) in patients with recent-onset psoriatic arthritis (PsA). Such data are crucial, since the therapeutic measures used to change the adverse course of PsA are more likely to succeed if we intervene early. In the present study, we used predictive models based on machine learning to detect variables associated with achieving MDA in patients with recent-onset PsA. We performed a multicenter observational prospective study (2-year follow-up, regular annual visits). The study population comprised patients aged ≥18 years who fulfilled the CASPAR criteria and less than 2 years since the onset of symptoms. The dataset contained data for the independent variables from the baseline visit and from follow-up visit number 1. These were matched with the outcome measures from follow-up visits 1 and 2, respectively. We trained a random forest-type machine learning algorithm to analyze the association between the outcome measure and the variables selected in the bivariate analysis. In order to understand how the model uses the variables to make its predictions, we applied the SHAP technique. We used a confusion matrix to visualize the performance of the model. The sample comprised 158 patients. 55.5% and 58.3% of the patients had MDA at the first and second follow-up visit, respectively. In our model, the variables with the greatest predictive ability were global pain, impact of the disease (PsAID), patient global assessment of disease, and physical function (HAQ-Disability Index). The percentage of hits in the confusion matrix was 85.94%. A key objective in the management of PsA should be control of pain, which is not always associated with inflammatory burden, and the establishment of measures to better control the various domains of PsA