Abstract This paper describes the photogrammetric 3D modelling of complex buildings using low‐cost automatic image matching ( AIM ), consumer‐grade digital cameras and low‐altitude imagery. To verify potential this method, it was applied to documentation a specific case: towers roofs Cathedral Santiago de Compostela in Spain, UNESCO World Heritage Site. The design development mechanism for coping with elevation, based on telescopic masts, essential. Models, orthophotos plans have been...

Methods of estimating the total amount above-ground biomass (AGB) in crop fields are generally based on labourious, random, and destructive situ sampling. This study proposes a methodology for herbaceous using conventional optical cameras structure from motion (SfM) photogrammetry. The proposed method is determination volumes according to difference between digital terrain model (DTM) surface (DSM) vegetative cover. A density factor was calibrated subset random samples relate volume...

The examination of the meso-mechanical properties soils is fundamental to understand its macro-behaviour. This paper aims evaluate potential application Digital Image Correlation (DIC), an optical image processing approach, in direct shear test (DST) for soils. Hence, a new box was designed investigate close behaviour granular materials. noise-floor and displacement accuracy were discussed assess reliability DIC, besides effectiveness also examined. distribution displacements, strains, angle...

Infrared thermography (IRT) techniques for building inspection are currently becoming increasingly popular as non-destructive methods that provide valuable information about surface temperature (ST) and ST contrast (delta-T). With the advent of unmanned aerial vehicle (UAV)-mounted thermal cameras, IRT technology is now endowed with improved flexibility from an perspective study envelopes. A case cellar in Northwest (NW) Spain used to assess capability reliability low-altitude passive...

Infrared thermography techniques (IRT) are increasingly being applied in non-invasive structural defect detection and building inspection, as they provide accurate surface temperature (ST) ST contrast (Delta-T) information. The common optional or off-the-shelf installation, of both low- high-resolution thermal cameras, on commercial UAS further facilitates the application IRT by enabling aerial imaging for envelope surveys. software used photogrammetry is currently easy to use. increasing...

Abstract Cultural heritage in coastal or shallow aquatic environments is often located areas where access difficult accurate survey and documentation may not always be possible with terrestrial equipment. The combination of photogrammetry unmanned aerial vehicles (UAVs) generates a range possibilities across multiple sectors, including history, ethnography cultural studies. Additionally, these methods can used to prospect new archaeological sites. This article presents three case studies...

ABSTRACT Photogrammetry is a commonly used technique in three‐dimensional image‐based modelling for cultural heritage documentation. Three‐dimensional techniques that combine close‐range photogrammetry and automatic image matching are presently attracting great deal of interest. This paper evaluates the feasibility application photogrammetric an archaeological site with image‐matching software consumer‐grade digital camera. In order to correctly model upward‐facing surfaces using this...

One of the main factors affecting application photogrammetric techniques to 3-D modeling is degree space limitations imposed by nearby objects. Numerous studies show reliability structure from motion (SFM) when object located in a large and accessible space; however, applying this technique particular case, shooting must be adapted peculiarities each location. This article presents documentation façades different urban typologies, focusing on photo-shoot arrangement that best enables us...

The high level of automation, user-friendliness and cost-effectiveness photogrammetry have contributed significantly to its popularisation among amateur users in recent years. Paradoxically, this situation poses challenges when relying on the accuracy derived 3-D products requiring control procedures be implemented. In context, we present a case study D3Mobile project: fully online competition for participants worldwide funded by International Society Photogrammetry Remote Sensing (ISPRS)....

Elastic timber gridshells are lightweight structures whose stiffness is highly dependent on multiple factors, such as boundary conditions and the semi-rigidity eccentricity of joints. Their structural analysis requires calibrated numerical models that incorporate all aspects influencing stiffness. Unfortunately, very little research experimentally verified can be found. This paper focuses behaviour a novel concept triaxial elastic long-gridshells supported only their short sides, called by...

The pseudoscopic effect in satellite imagery causes perception problems for rugged terrain. topographic relief is perceived reverse images with southeast illumination because of the position land shadows and mechanisms human vision depth perception. This article presents a correction method false phenomena. Superposition orthoimage correctly shaded digital elevation model (DEM) provides correct three-dimensional visualization relief. study demonstrates applicability this processing technique...

Abstract In recent years, three‐dimensional (3D) modelling with photogrammetry and enhancement methods from computer graphics communities have been used excellent results for studies of rock art engravings. However, despite their abundance, most Atlantic elements in the Iberian Peninsula not yet geometrically documented 3D. The aims this study include deepening application imaged‐based modelling, digital 3D model post‐processing, diffusion tools determining an accessible straightforward...

Abstract Due to their cost, high-end commercial 3D-DIC (digital image correlation) systems are still inaccessible for many laboratories or small factories interested in lab testing materials. These professional can provide reliable and rapid full-field measurements that essential some laboratory tests with high-strain rate events high dynamic loading. However, stress-controlled experiments, such as the Brazilian tensile strength (BTS) test of compacted soils, samples usually large fail...

SfM-MVS (Structure from Motion -Multi View Stereo) photogrammetry is a cost-effective and versatile technique used, among other applications, for the three-dimensional (3D) modelling of archaeological heritage sites artistic objects. Traditional primarily derives calibration parameters camera exterior orientation variables ground control points (GCPs), obtained by means GPS, tie (TPs). The approach simultaneously computes both relative projection geometry set sparse 3D points. However, when...

El levantamiento de fachadas es un proceso demandado en multitud ámbitos como la planificación arquitectónica y el planeamiento. La fotogrametría ofrece gran precisión geométrica nos permite visualizar textura del objeto cuestión. Con aparición software gratuito este ámbito, ésta se convierte una las técnicas más asequibles. Para demostrar posibilidades esta metodología, presentan aquí tres ejemplos levantamientos distinta tipología, realizados con mediante utilización gratuito, utilizando...