1,720,994 research outputs found
TECNICHE DI RILEVAMENTO PER LA PREVENZIONE DEI RISCHI AMBIENTALI
No full textSurface monitoring is essential to understand the spatial and temporal evolution of complex landscape modifications and instabilities related to road and railway infrastructures. In recent years, the terrain change detection methods have evolved particularly with the development of increasingly automatic extraction procedures of both DTM and DSM. Prevention of damages caused by natural disasters does not only concern weather forecasts, but requires constant attention and practice of monitoring and controlling human activity on territory. Practically, the problem is not knowing if and when an event will affect a determined area, but recognizing the possible damages if this event happened, by adopting adequate measures to keep them down as far as possible, and requires the necessary tools for a timely intervention. To solve such requirements, current satellite technology, with recurrent data acquisition for the timely generation of cartographic products updated and coherent to the territorial investigation, offers the possibility to fill the temporal gap between the need of urgent information and official reference information. The fundamental merits of the high resolution remote sensing methods are the ability to perform surveys at regular intervals, the characteristics of the image and the revisit times. These features are very useful in environmental monitoring especially in the event of emergency or also in medium scale cartographic production, particularly in the zones of difficult access and in developing countries. The research presented here aims at answer to the growing need of optimization and rationalization of long term monitoring systems of displacements and degradation due to the interaction of artificial artifacts of transport with such natural phenomena. To test the methodology we chose an area that presents a particular geo-morphological setting, in the municipality of Fasano (BR, Southern Italy). The area is affected by frequent hydrogeological dangerous events such as flooding and is classified as a zone of “high hydraulic hazard” in the regional Hydrogeological Structure Plan (PAI). For this area we used a GeoEye-1 stereo-pair for extracting a DTM in order to verify the usefulness of satellite techniques for the recognition of environmental risks
The road/conveyor belt supplyng the Cerano power station (Brindisi): influences on the groundwater flow
No full textTecniche e metodologie di rilievo per una cava in pietra calcarea
No full textIl presente lavoro ha lo scopo di mettere a confronto le diverse tecniche e metodologie per il rilievo di una cava in pietra calcarea, situata nel territorio del comune di Turi (BA), descrivendone le precisioni e le accuratezze ricavate, le difficoltà incontrate e gli accorgimenti operativi adottati, con particolare cenno ai costi sostenuti. Il lavoro svolto vuol essere anche un semplice riferimento per tutti i topografi che operano nel settore estrattivo. I soggetti titolari della coltivazione delle cave devono adempiere con scadenza annuale agli obblighi, previsti dalle Norme Tecniche di Attuazione (NTA) del Piano Regionale Attività Estrattive (PRAE) della Regione Puglia, che ha tra i suoi obiettivi quello di focalizzare lo stato dell’arte del settore estrattivo, aggiornando la banca dati del Sistema Informativo Geografico del “Catasto Cave”. Tale obiettivo viene perseguito mediante la redazione da parte delle società che coltivano le “cave autorizzate” di schede statistiche e rilievi topografici che annualmente vengono forniti all’ Ufficio Controllo e Gestione del PRAE (ex Servizio Attività Estrattive). Il catasto cave è consultabile liberamente da qualsiasi utente mediante piattaforma Web-Gis
High resolution 3D ERT to help GPR data interpretation for researching archaeological items in a geologically complex subsurface
No full textMuro Leccese (Lecce) contains one the most important Messapian archaeological sites in southern Italy.
The archaeological interest of the site arises from the discovery of the remains of Messapianwalls, tombs, roads,
etc. (4th–2nd centuries BC) in the neighbourhood. The archaeological remains were found at about 0.3 mdepth.
At present the site belongs to themunicipality,which intends to build a newsewer network through it. The risk of
destroying potentially interesting ancient archaeological structures during theworks prompted an archaeological
survey of the area. The relatively large dimensions of the area (almost 10,000 m2), together with time and cost
constraints, made it necessary to use geophysical investigations as a faster means to ascertain the presence of
archaeological items. Since themost important targetswere expected to be located at a soil depth of about 0.3m, a
ground-penetrating radar (GPR) survey was carried out in an area located near the archaeological excavations.
Unfortunately the geological complexity did not allow an easy interpretation of the GPR data.
Therefore a 3D electrical resistivity tomography (ERT) scanwas conducted in order to resolve these interpretation
problems.
A three-way comparison of the results of the dense ERT measurements parallel to the x axis, the results of the
measurements parallel to the y axis and the combined results was performed.
Subsequently the synthetic model approach was used to provide a better characterization of the resistivity
anomalies visible on the ERT field data.
The 3Dinversion results clearly illustrate the capability to resolve in viewof quality 3Dstructures of archaeological
interest. According to the presented data the inversionmodels along one direction (x or y) seems to be adequate in
reconstructing the subsurface structures.
Naturally field data produce good quality reconstructions of the archaeological features only if the x-line and y-line
measurements are considered together. Despite the increased computational time required by the 3Dacquisition and
3D inversion schemes, good quality results can be produced
Integrated survey methodology for the crime reconstruction
No full textThe object of this study is to evaluate the applicability of photogrammetry and laser scanner techniques both on forensic ballistic reports and on reproduction of crime scene. In the first case, in a shooting range for small arms, photogrammetric and laser were used both for the acquisition of metric data related to the testing environment and for ballistic simulation on a suitable sample. The crime scene was specifically simulated in laboratory, while the room where a murder took place was re-created. Once the setting had been made, it was possible to perform the survey of the scene and the details in it by using laser scanner and photogrammetric techniques. Data acquisition has enabled authors to carry out a rapid reconstruction of the scene and detect several parameters using the available elements. Specifically, the processed data were also exported to a CAD and an image processing software
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