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Determining the limits of unmanned aerial photogrammetry for the evaluation of road runoff
No full textThe accuracy of point cloud data in runoff evaluation is a non-resolved question. The increasingly use of unmanned aerial photogrammetric systems shows great opportunities, although they provide less accuracy data than traditional survey systems. This manuscript presents a new method to check the usage limits of point clouds obtained from unmanned aerial photogrammetry in runoff evaluation. The methodology uses D8 algorithm for the runoff estimation. The quality of photogrammetric data is evaluated by comparison with a light detection and ranging scanning dataset that acts as ground truth. The methodology includes point cloud rasterization, with pixel cells ranging from 0.25 m to 5 m. Five test zones are selected from the road pavement and five from the road slopes. Results show that the runoff evaluation from the unmanned aerial photogrammetric data diverges from the mobile light detection and ranging data as cell size decreases and resolution increases. Studies that require cell sizes below 1 m are very influenced by the lower accuracy of the photogrammetric point clouds. However, the unmanned aerial surveys in larger areas with cell sizes above 2 m are perfectly affordable for this type of technology, without implication in the quality of runoff results.Xunta de Galicia | Ref. CN2012/269Xunta de Galicia | Ref. R2014/032Ministerio de Economía y Competitividad | Ref. TIN2013-46801-C4-4-RMinisterio de Economía y Competitividad | Ref. ENE2013-48015-C3-1-
Open letter: A global call to strengthen national soil biodiversity action through coordination and harmonization
Get PDFSoil biodiversity remains one of the least systematically studied components of global biodiversity, largely invisible in policy agendas. A coordinated soil biodiversity monitoring approach is urgently needed to enable national‐level action
Descubriendo Santa María de Sar. El proyecto Bernardo II y la memoria de la Compostela medieval
No full textEmotions and retrogenesis. A contrastive analysis of the language of emotion in children and adults with dementia
Get PDFLa teoría de la retrogénesis sostiene que existe un paralelismo entre los procesos de adquisición del lenguaje en la población infantil y su deterioro en adultos diagnosticados con demencia. En esta línea, esta investigación parte de los siguientes objetivos: (i) analizar los patrones generales del lenguaje de las emociones en niños y adultos con enfermedad de Alzheimer; (ii) contrastar los resultados de ambos grupos para ver si existen características comunes entre el desarrollo del lenguaje de las emociones y su deterioro en la demencia. Para ello, se ha grabado en vídeo a dos grupos: 27 personas diagnosticadas con demencia en distintas fases de la enfermedad (13 en estadio inicial, 8 en moderado y 6 en severo); y 24 niños entre 3 y 6 años. La prueba consistió en una entrevista semidirigida en la que se preguntó a los participantes por sus gustos, historia de vida y rutinas, con el objetivo de obtener un lenguaje lo más natural posible. Los resultados indican que, si bien existen ciertas similitudes en los patrones de uso de la población infantil y los estadios moderado y avanzado de la demencia, en general los participantes adultos son capaces de expresar un rango emocional más amplio y utilizan una mayor variedad de recursos léxicos para hacerlo.The theory of retrogenesis states that there is a parallel between the processes of language acquisition in childhood and its deterioration in adults diagnosed with dementia. In this line, the present study pursues the following objectives: (i) to analyze the general patterns of emotional language in children and in adults with Alzheimer’s disease; and (ii) to compare the results of both groups in order to determine whether common features exist between the development of emotional language and its decline in dementia. To this end, two groups were video recorded: 27 individuals diagnosed with dementia at different stages of the disease (13 in the initial stage, 8 in the moderate stage, and 6 in the severe stage) and 24 children between 3 and 6 years of age. The task consisted of a semi-structured interview in which participants were asked about their preferences, life stories, and daily routines, with the aim of eliciting the most natural language possible. The results indicate that, although there are certain similarities in the usage patterns of the child group and those in the moderate and advanced stages of dementia, adult participants generally display a wider emotional range and employ a greater variety of lexical resources to express it
3D modeling of building indoor spaces and closed doors from imagery and point clouds
Get PDF3D models of indoor environments are increasingly gaining importance due to the wide range of applications to which they can be subjected: from redesign and visualization to monitoring and simulation. These models usually exist only for newly constructed buildings; therefore, the development of automatic approaches for reconstructing 3D indoors from imagery and/or point clouds can make the process easier, faster and cheaper. Among the constructive elements defining a building interior, doors are very common elements and their detection can be very useful either for knowing the environment structure, to perform an efficient navigation or to plan appropriate evacuation routes. The fact that doors are topologically connected to walls by being coplanar, together with the unavoidable presence of clutter and occlusions indoors, increases the inherent complexity of the automation of the recognition process. In this work, we present a pipeline of techniques used for the reconstruction and interpretation of building interiors based on point clouds and images. The methodology analyses the visibility problem of indoor environments and goes in depth with door candidate detection. The presented approach is tested in real data sets showing its potential with a high door detection rate and applicability for robust and efficient envelope reconstruction.Ministerio de Economía y Competitividad | Ref. FPU AP2010-296
Aerobiological data as an indicator for invasive plants monitoring
Get PDFThe relationship between airborne pollen of the invasive species Acacia dealbata Link, climate factors, and its ground expansion is studied using aerobiological data and aerial photography to test if pollen data can be used as a tool to detect changes in the surface area of invasive species. Airborne pollen monitoring was performed over a 31 years period (1994–2024). Additionally, eight years within this interval were selected for Acacia area measurement with high-resolution aerial imagery, based on the availability of photographs. Aerial pollen recorded correlated significantly with maximum temperatures during the pre-peak period, stabilizing the correlation in the time series after 23 years. Additionally, the pollen integral showed an increasing trend that was not climate dependent. Mapped Acacia areas expanded from 200.2 ha in 1994 to 273.7 ha in 2024, a 36.7 % increase reflected in the increase of pollen levels, reaching a 2.3-fold rise. Acacia stabilizes and even reduces its surface during the last years of study. The interaction of pollen recorded in pre-peak period and maximum temperature explains 77 % of the invasion of Acacia surface variation, with an estimated area error of 16.51 ha. It is concluded that Acacia pollen serves as a new indicator to monitor Acacia surface and reconstruct its cover in the absence of high-resolution aerial images. Monitoring pollen concentrations in the atmosphere constitutes a useful tool for the management of invasive species.Agencia Estatal de Investigación | Ref. FJC2021-047565-IUniversidade de Vigo | Ref. Project INOU2024-0
Thematic analysis of food discourse from co-occurrence graphs
Get PDFEste artículo se centra en el análisis temático del discurso alimentario de la divulgación científica en los medios de comunicación generalistas. Sus objetivos son: (i) establecer los temas del discurso de la alimentación; (ii) determinar el grado de importancia y centralidad de cada uno; (iii) analizar las relaciones que se establecen entre ellos; y (iv) valorar los enfoques ideológicos que se ha dado a estos temas. Se parte del análisis de un corpus de 144 artículos sobre alimentación de los 12 periódicos generalistas con mayor alcance; de este corpus se ha confeccionado un grafo de coocurrencia de palabras no dirigido y pesado a partir del cual se han calculado el grado de intermediación, el grado del nodo y la modularidad. Estas medidas nos han permitido identificar comunidades que constituyen los distintos temas y subtemas. Se ha concluido que el enfoque fundamental de la alimentación es la salud, que los alimentos ya no son simplemente comida, sino nutrientes y que los colectivos que centran esta visión son las mujeres, los niños y las niñas.This paper focuses on the thematic analysis of food discourse on mass media when they conduct scientific dissemination. It aims to (i) establish the topics of food discourse; (ii) determine the degree of importance and centrality of topic, (iii) analyze the relationships established among them and (iv) assess the ideological approaches given to these issues. For this purpose, a corpus with 144 news on nutrition published in the most-read Spanish general media has been compiled. From this corpus, an undirected and weighted word co-occurrence graph has been elaborated and its betweenness, degree and modularity have been calculated. These measures have allowed us to identify communities that constitute the different topics and subtopics. It has been concluded that the fundamental focus of food is health, that food is no longer perceived as just food, but as nutrients, and that the main targeted groups are children and women
Smoothed Particle Hydrodynamics for coastal engineering problems
Get PDFSmoothed Particle Hydrodynamics is a numerical method to solve problems of computational fluid dynamics. The method has been proven to be suitable to reproduce free-surface phenomena such as breaking waves, fluid–structure interaction and no-linear behaviour of the fluid are studied. DualSPHysics is a SPH code that enables the simulations of several million particles in a reasonable computational time, making possible the study of real engineering problems. The code is validated with analytical and experimental data showing reliability, accuracy and efficiency. Finally, the capabilities of DualSPHysics to reproduce wave–structure interaction are shown where wave heights and forces exerted onto objects of the coast are numerically computed. The case of study mimics a realistic promenade including the urban furniture and with dimensions and geometries close to the real ones.Universidade de Vigo | Ref. INOU12-03Xunta de GaliciaEuropean Regional Development Fund (FEDER)Ministerio de Economía y Competitividad | Ref. BIA2012-38676-C03-03Universitat Politècnica de Catalunya (UPC
The strategy of a new tourism model: polycentric sustainable tourism
No full text[Inicio] At the European level, mass tourism has become one of the defining challenges of our time. While
it generates significant economic revenue, its unchecked growth places heavy pressure on natural
resources, public infrastructure, and the social fabric of host communities. Iconic destinations risk losing
their authenticity, while residents face rising costs of living, congestion, and declining quality of life.
Tourism remains a driver of growth and cohesion across the Atlantic Area, yet the current model shows
structural challenges. Overtourism in cities such as Porto, Dublin, or Santiago de Compostela strains
infrastructure, increases housing costs, and generates social tensions. Meanwhile, rural and inland regions
remain overlooked, experiencing economic stagnation, depopulation, and wasted cultural potential.
This imbalance creates a dual crisis: excess tourism in some areas, insufficient tourism in others. It
erodes resident well-being, weakens territorial cohesion, and undermines sustainability. Climate change,
demographic decline, and shifting tourist preferences make the problem even more urgent. To ensure
long-term resilience, tourism must be rethought as a system that balances demand with the capacity of
places to host visitors sustainably. This means safeguarding environmental resources, preserving cultural
identity, and ensuring that the benefits of tourism are shared fairly. The future of tourism depends
on reconciling the interests of visitors and residents alike - creating experiences that are meaningful,
responsible, and respectful, while protecting the well-being of the communities that make destinations
unique. [...]Interreg Atlantic Area, European Regional Development Fund-ERD
