1,721,192 research outputs found
2nd edition of instrumenting smart city applications with big sensing and earth observatory data: Tools, methods and techniques
Full text linkIn lieu of an abstract, this is an excerpt from the first page.
The exponential growth in the volume of Earth observation data and the increasing quality and availability of high-resolution imagery are increasingly making more applications possible in urban environments. In particular, remote sensing information, especially when combined with location-specific data collected locally or through connected devices, presents exciting opportunities for smart city applications, such as risk analysis and mitigation, climate prediction, and remote surveillance. On the other hand, the exploitation of this great amount of data poses new challenges for big data analysis models and requires new spatial information frameworks capable of integrating imagery, sensor observations, and social media in geographic information systems (GIS)
Levelling data management for the monitoring of land subsidence
No full textThe main source of geodetic measurements for the detection of ground vertical movements is usually levelling. A considerable amount of data from different sources must be often elaborated in order to have informations on subsidence. Such data may be disomogeneous with regard to quality, epoch and space. The purpose of this paper is to present the use of a relational data base for the storage, retrieval and elaboration of levelling data. The integration of the system in a GIS can play an important part in a multidisciplinary approach to a subsidence problem
La cartografia storica in ambiente digitale
No full textLa pubblicazione, facendo riferimento ad alcuni casi di studio trattati dagli autori, espone le problematiche legate all'uso della cartografia storica in ambiente digitale: dalle fasi di acquisizione e georeferenziazione fino alle elaborazioni per diverse forme di analisi e valorizzazion
3D Survey and Data Processing of Bolivian Archaeology: The Ritual Receptacle from Tiwanaku
Full text linkThe archaeological site of Tiwanaku is among the most important examples of Bolivian archaeology and UNESCO World Heritage Site since 2000. This works reports a geomatic-based surveying and modelling methodology applied to a ritual receptacle excavated from the semi-subterranean temple in the archaeological complex. A high-resolution 3D survey was conducted through structured-light projection scanning and post-processing operations were carried out to emphasize surface details. Most of the operations were conducted in open-source software, with the aim to establish a quick and repeatable methodology to be applied to similar case studies. The final outputs, consisting of geometry projections (unrolled meshes), digitally enhanced surfaces and vector graphics can support the work of archaeologists in interpreting the iconography depicted on the receptacle and to conduct further studies to shed light about culture and religion of the civilization that inhabited Tiwanaku
Levelling and GPS networks to monitor ground subsidence in the Southern Po Valley
No full textAfter a short historical introduction to the problem of the subsidence in the Po Valley, some results are shown of levelling campaigns carried out by various authorities or agencies in recent years, mainly in the southeast part of the Po Valley. We also present the results obtained along the coastline using the GPS technique both in a static and in fast-static modes. Attention is focused on the problem of the homogeneity of data from different sources, different periods and using different reference benchmarks. To overcome these problems, we propose a general levelling network covering the whole area of the valley, south of the Po river, connected with a GPS network of more than 50 points. This network will represent a spatial and temporal reference framework for all the measurements made in the past and for those planned for the future. A data information system has been implemented in order to organise and manage all available data in a well defined and homogeneous framework. This system will make it possible to store other related data, such as the pattern of the water table. geological evidences, land use, etc. (C) 2000 Elsevier Science Ltd. All rights reserved
Low-height aerial photogrammetry for archaeological orthoimaging production
No full textIn the framework of the Joint Archaeological Mission of the Universities of Bologna and Lecce at the ancient town of Soknopaiou Nesos (Fayyum, Egypt) a wide-range of geomatic methodologies were experimented (GPS, total station surveys, low-height aerial and close-range photogrammetry, Visual Reality ecc.). The surveys were conducted with the aim of recording metrical and non-metrical information inside a common reference system. The paper deals with the use of low-height aerial imagery carried-out by a balloon-kites system equipped with a non-metrical camera. Descriptions of the preliminary results obtained through a self-calibration process of the camera, the use of images within a digital photogrammetric station for orientation, plotting, surface modelling and orthomosaicing are also reported
Close-range photogrammetry, virtual reality and their integration in archaeology
No full textThe paper describes an experience of integration of different topographic and photogrammetric surveying methods, together with photographic virtual reality techniques, in the area of the ancient town of Bakchias (Fayyum, Egypt). The surveys were conducted with the aim of recording metrical, and non metrical information, in a common reference system, allowing to support GIS based multimedia realisations. The capabilities and advantages of the application of digital techniques in archaeology and Cultural Heritage are shown by some examples, related to surveying of structures and small objects. One main objective of the work is to assess the potentiality of virtual reality technologies as core of a system permitting a site to be studied from remote locations using Internet; the use of these technologies are today mainly devoted to qualitative purposes (visualisation and interactive exploration), but the interface with simple surveying software applications, based on digital photogrammetry, could bring new powerful instruments also for metrical investigation
Comparison of techniques for generating digital terrain models from contour lines
No full textSimple but objective criteria for evaluating the quality of DTMs, derived from digital contour lines, are defined. Such criteria are then applied to terrain models, obtained by means of four different procedures, which refer to three sample areas characterized by complex morphological settings. The results of the comparison shows that each DTM is affected by one or more types of error or pitfall; however, one TIN generator and one grid interpolator proved to be capable of effectively producing terrain models which largely reflect the ground morphology as expressed by the input contour lines. © 1997 Taylor & Francis Group, LLC
Le scienze dell’ingegneria, formazione e opportunità in campo ambientale
Full text linkThe relationship between Engineering Sciences and environmental issues has a long history, but has seen important developments in recent decades, also regarding university education. In this work, the topic is approached from two perspectives. On the one hand, some aspects related to didactics in the academic sphere are examined, and in particular to the experience gained at the University of Bologna with the institution of degree courses in Environmental Engineering. On the other hand, some opportunities offered by the new techniques and technologies for surveying and monitoring the territory are presented, capable of providing new and effective tools for the knowledge and understanding of the environment and ongoing phenomena.La relazione tra le Scienze dell’Ingegneria e le questioni ambientali ha una lunga storia, ma ha visto evoluzioni importanti negli ultimi decenni, anche per quanto concerne la formazione in ambito universitario. In questo lavoro il tema viene affrontato secondo due prospettive. Da un lato, sono esaminati alcuni aspetti legati alla didattica in ambito accademico e in particolare all’esperienza vissuta nell’Università di Bologna con l’istituzione dei corsi di laurea in Ingegneria per l’Ambiente e il Territorio. Dall’altro, sono presentate, a titolo di esempio, alcune opportunità offerte dalle nuove tecniche e tecnologie di rilevamento e monitoraggio del territorio, in grado di fornire strumenti nuovi ed efficaci per la conoscenza e la comprensione dell’ambiente e dei fenomeni in atto
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