425 research outputs found
Spherical Photogrammetry as Rescue Documentation for The Reconstruction of some UNESCO Sites in Syria
No full textRicostruzione per fotogrammetria sferica del minareto abbattuto di Aleppo e delle mura della cittadell
THE USE OF STRUCTURE FROM MOTION TECHNOLOGIES FOR HIGH-RESOLUTION TERRAIN MODELLING ON HIGH ALTITUDE CATCHMENTS
Full text linkThe research project developed in this Thesis involves the application of close-range photogrammetry based on the Structure from Motion (SfM) approach that allows reconstructing the 3D point cloud of the photographed object from a sequence of overlapping images taken with a common digital camera. Thanks to the characteristics of high portability of the equipment, flexibility of the method to reconstruct surface at different scale with high resolution, low-cost, and ease of use also for not expertise during both acquisition and processing phase, the SfM-photogrammetry is becoming a valid alternative to the range-based technology for remote sensing and monitoring of dynamic natural environments. The aim of this research was to test and validate the capability of a ground photogrammetric survey to reconstruct a surface by dealing the main practical issues of a ground acquisition and by highlighting the main error sources which may be present within the field data. Furthermore, the feasibility of the SfM-photogrammetry approach for monitoring glacial and periglacial processes was tested in order to highlight the limitation and the potential of the method for these applications.
A total of four study sites were surveyed in order to validate the photogrammetric method. A depth investigation on the photo-based approach was carried out in a test field area where different image acquisition, georeferencing methods and processing were compared and evaluated. A terrestrial panorama images acquisition was proposed and tested in this work. This acquisition strategy provided advantages in comparison to a normal single frame acquisition by increasing the spatial coverage of the reconstructed surface and the number of overlapping images that ensure higher accuracy.
The potential and limits of the ground-based SfM-photogrammetry approach for monitoring glacial and periglacial processes were investigated in three different environments. For each of these study areas several tests concerning the quality of the obtained photogrammetric digital elevation models (DEMs) were performed. Different resolution and accuracy of the photogrammetric DEMs were obtained for the three case studies according to the different ground survey characteristics and survey object (i.e. extension and accessibility of the areas, camera-object distance, surface coverage, and camera resolution and geometry network). For the investigated areas, the main practical problems of the ground photogrammetric surveys that affected the SfM-photogrammetry results were: i) image quality determined by poor texture (i.e. snow and dark rock area with low contrast) and strong illumination variations during long time photos acquisition, ii) camera network geometry (i.e. high camera-object distance, poor overlapping images) and iii) distribution and accuracy of control measurements. However, the photogrammetric 3D model allowed us to estimate with good accuracy the glacial and periglacial processes respect to the reference data.
The investigation on the SfM-photogrammetry quality reconstruction allowed to have a complete view of the critical points and the potential of this method for multitemporal analysis in remote alpine area and thus to assess the applicability range for future realistic case scenarios
Use of terrestrial photogrammetry based on structure-from-motion for mass balance estimation of a small glacier in the Italian alps
No full textNon-financial information as a driver of transformation. Evidence from Italy
Full text linkThe EU Directive on disclosure of non-financial and diversity information (2014/95/EU), transposed in
Italy by the Legislative Decree no. 254 of December 30, 2016, in force since January 25, 2017, is
contributing to a cultural transformation of corporate governance models. By triggering a growing
consideration of all stakeholders’ needs, this transformation may influence the processes at the board
level, the behavior of board members as well as companies’ culture, strategy and business models.
The 2017 CONSOB Report on Corporate Governance of Italian listed companies provided a first review
of governance behavior of Ftse Mib companies on the verge of the 2014/95/EU Directive, focusing on
the inclusion of non-financial matters in reporting and at the board level.
This Report extends the previous analysis by including all Italian firms with ordinary shares listed on
the MTA at the end of 2017 and delving deeper along three dimensions. First, it reviews how Italian
listed firms have implemented the Directive 2014/95/UE by referring to the publication of a nonfinancial statement (NFS), whether they have realized the materiality analysis and whether they have
applied a process including both an internal and an external assessment. Second, the Report explores
whether companies consider non-financial issues relevant also at the board level, by referring to the
guidelines issued by companies prior to the 2018 board appointment, the board evaluation process
and the board induction programs organised in 2018. Finally, the findings of a survey involving the
members of the Italian community of non-executive and independent directors (Nedcommunity) are
presented. The documental analysis aimed to ascertain whether non-financial topics are deemed
important also for the selection of the board members’, while the survey focused on the independent
directors’ engagement in the board activity concerning the governance of non-financial issues and the
compliance with the Decree 254/2016.1
The goal of the analysis is to detect whether, beyond compliance, companies reporting on
environmental, social and governance (ESG) are also undergoing a strategy and business model
transformation. Integration of ESG factors into many different areas of company’s organization and
processes may in fact trigger a cultural transformation of governance models: from the company’s
purpose to the activation of cross-functional and forward thinking behaviors and projects; the
progressive consideration of ESG into monitoring and reporting tools; the engagement with internal
and external stakeholders and their contribution in defining the relevance of non-financial issues in
the materiality analysis; the inclusion in the risk governance of non-financial risk management.
The chart below summarizes and classifies the findings of the analysis by identifying three progressive
steps marking the transformation process: awareness, capabilities, engagement.2
The evidence
gathered in this Report shows that while a few large companies are now starting to integrate ESG
into governance, the majority of firms (predominantly small ones) are still focused on compliance
Comparative analysis of terrestrial laser scanner and photogrammetry for the mass balance calculation of Montasio Occidentale Glacier
No full textSuitability of ground-based SfM-MVS for monitoring glacial and periglacial processes
Full text linkPhoto-based surface reconstruction is rapidly emerging as an alternative survey technique to lidar (light detection and ranging) in many fields of geoscience fostered by the recent development of computer vision algorithms such as structure from motion (SfM) and dense image matching such as multi-view stereo (MVS). The objectives of this work are to test the suitability of the ground-based SfM-MVS approach for calculating the geodetic mass balance of a 2.1km2 glacier and for detecting the surface displacement of a neighbouring active rock glacier located in the eastern Italian Alps. The photos were acquired in 2013 and 2014 using a digital consumer-grade camera during single-day field surveys. Airborne laser scanning (ALS, otherwise known as airborne lidar) data were used as benchmarks to estimate the accuracy of the photogrammetric digital elevation models (DEMs) and the reliability of the method. The SfM-MVS approach enabled the reconstruction of high-quality DEMs, which provided estimates of glacial and periglacial processes similar to those achievable using ALS. In stable bedrock areas outside the glacier, the mean and the standard deviation of the elevation difference between the SfM-MVS DEM and the ALS DEM was-0.42 ± 1.72 and 0.03 ± 0.74 m in 2013 and 2014, respectively. The overall pattern of elevation loss and gain on the glacier were similar with both methods, ranging between-5.53 and + 3.48 m. In the rock glacier area, the elevation difference between the SfM-MVS DEM and the ALS DEM was 0.02 ± 0.17 m. The SfM-MVS was able to reproduce the patterns and the magnitudes of displacement of the rock glacier observed by the ALS, ranging between 0.00 and 0.48 m per year. The use of natural targets as ground control points, the occurrence of shadowed and low-contrast areas, and in particular the suboptimal camera network geometry imposed by the morphology of the study area were the main factors affecting the accuracy of photogrammetric DEMs negatively. Technical improvements such as using an aerial platform and/or placing artificial targets could significantly improve the results but run the risk of being more demanding in terms of costs and logistics
Monitoring Glacial and Periglacial Environments in the Ortles-Cevedale (Eastern Italian Alps) Using the Sfm-Mvs Approach
No full textApplication of terrestrial photogrammetry for the mass balance calculation on Montasio Occidentale Glacier (Julian Alps, Italy)
No full textPortraits of Livia in Asia Minor
Full text linkBu çalışmada, Roma İmparatorluğu'nun doğudakien önemli eyaletlerinden birisi olan Küçük Asya'da elegeçmiş Livia portreleri tipolojik acıdan ele alınacaktır.Söz konusu eserler, bugüne kadar Livia portrelerinikonu alan birçok çalışmada ele alınmıştır. Ancak konuile ilgili en kapsamlı ve güncel yayın, E. Bartman'a aittir.Araştırmacı yayınında adı geçen coğrafyadaki portreleri Marbury Hall tipinin birer varyantı olarak kabuletmiştir. Ancak tarafımızca yapılan gözlemler, bu portrelerin Fayumtipini de ayırt edici özelliklerine sahip olduklarını ve hatta bu iki tipe yabancı unsurları da taşıdıklarını ortaya koymuştur. Makalede öncelikli olarakbu iki tipin ayırt edici özelliklerinden bahsedilecek, ardından Küçük Asya eserlerinin bu tiplerin hangi özellik/özelliklerine sadık kalınarak uygulama bulduğu üzerinde durulacak ve yabancı unsurlar için de önerilersunulacaktır.This article treats from a typological perspective the portraits of Livia, portraits originating from the major eastern provinces of the Roman Empire, as also from Asia Minor. These portraits have already been analysed in scholarly works. In this respect E. Bartman has presented the most recent and comprehensive scientific analysis. The author has stated that the portraits in question were variants of the Marbury Hall statuary type. However, observation shows these portraits carry the characteristics of more than one portrait-type, for example of the Fayum type. In addition, they have completely different elements from this type. The following article first addresses the differences between the two types and subsequently, the question is discussed, as to which characteristics of these types can be observed in the Livia portraits fromAsia Minor. Finally, the postulated different elements arestated
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