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- Silves bridge geometric model via structure-from-motion: tool for heritage digital catalogsPublication . Prates, Gonçalo; Marçal Gonçalves, Marta; Lopes, Ana; Laranja, RobertoThe old bridge in Silves, Portugal, has five perfectly formed arches extending over the Arade river with about 76 meters long built of local materials. In the 14th century this structure was rebuilt on the location of a previous structure built when Silves was the Moorish capital between the 8th and 13th centuries occupation of the Algarve. Though a Roman road might have crossed this area, there is no medieval descriptions mentioning a bridge in Silves, still it is also known as the Roman bridge.After interventions in the 14th, 17th, 18th and 20th centuries, the bridge was classified as monument of public interest and became pedestrian-only and frequently evaluated for its risk of collapse. Stereo-photogrammetry is a recognized surface reconstruction tool applied for almost one century, where from several overlapping images of the surface a 3D model can be obtained. Contrasting with classical stereo-photogrammetry, Structure-from-Motion (SfM) is a nearly automated compilation of digital imagery processing strategies that solve for camera position and surface geometry using matching features identified in several images from diverse perspectives and preferably with high degree of overlap. Together with ongoing increase in computer power, SfM allowed digital stereophotogrammetry to be operative for close-range, high-resolution and non-metric overlapping digital images, and cost-effective. Applying these nearly automated strategies to digital images of the old bridge in Silves taken from the surrounding grounds, a dense point-cloud was computed providing its complete digital model allowing accurate measurements and materials visual identification, key elements for heritage digital catalogs and historical building information models.
- Minute city concept for healthy tourism during the COVID-19 pandemic crisis. who for? The city of Lagos, PortugalPublication . Pires Rosa, Manuela; Lopes, Ana; Aghaeizadeh, Esmaeil; Gomes, André; Andraz, JorgeUrban spatial organization provided an important contribution for healthy tourism in the first COVID-19 pandemic period. The 15-Minute City concept promotes walking which is essential for the development of outdoor activities for a healthier tourism. The tourist city of Lagos (Portugal) is a pilot city of the Interreg Med SuSTowns Project which aims to promote sustainable and resilient territories. This study presents an analysis of the pedestrian accessibility through a specific geographical indicator: the percentage of short-term rentals existing in the surrounding tourist attractions. Ideal standard distances, studied internationally, were considered to assess this close proximity. Different walking speeds were considered to address human diversity and their implications on the 15-Minute City concept. The functionalities of the geographic information systems, in particular the assessment of distances over the pedestrian network were used. The results indicate that in the city of Lagos there is a trend towards an effective 15-Minute City for healthy tourists, promoting walking which could enhance tourism attraction. For tourists with reduced mobility, the use of accessible public transportation is required and needs to be integrated in the 15-Minute City concept.