1,721,050 research outputs found
Variazioni morfologiche planimetriche di aste fluviali rilevate per confronto di carte topografiche
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Applicazioni di fotogrammetria panoramica per il rilievo della chiesa di San Cataldo a Palermo
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Thermal remote sensing of the urban microclimate change in a post earthquake depopulation: the case study of L’Aquila (Italy)
No full textThis study presents an attempt to use Landsat satellite images to detect the urban microclimate
changes of the city centre after the earthquake that affected L'Aquila city (Abruzzo region), on April 2009. In
fact, after the main seismic event, the collapse of the most part of the buildings and the consequent almost total
depopulation of historic city center may have caused a change in the microclimate. This work targets the
development of an inexpensive work flow - by using the Landsat ETM+ scenes - to construe the evolution of
the urban land use after the catastrophic earthquake that hit the L’Aquila city on 2009, April 6. The choice to
use freely available high resolution remote-sensed images and the Free and Open Source tools for the GIS
analysis of the data could help the local governance to monitor the spatial dynamics of the urban area and to
state effective policies to manage such events in the long-term and at low cost. We hypothesized, in fact, that
probably before the earthquake the temperature was higher in the city center due to the presence of inhabitants
(and thus home heating); while the opposite situation happened in the surrounding areas were new settlement of
inhabitants grew in few months. The study wants to evaluate if the use of Landsat archive images could provide
useful information to understand the urban changes induced by catastrophic event
Unmanned aerial vehicle for post seismic and other hazard scenarios
No full textOn April 6, 2009, an earthquake hits the old city of L’Aquila resulting in hundreds of victims and thousands of collapses. The post emergency and very crucial phase regarding surveys, structure controls and investigations till now is fully underway. Conventional surveying techniques using high precision total stations, GNSS and laser scanners, are instruments of extreme operability but here are still many evident limits on their use especially regarding the survey of both the roofs and the facades of tall buildings or dangerous places, typical in post earthquake situations. Another very important disadvantage of the traditional surveying, especially during the post seismic periods, regards the overall safety of the instruments, operators and workers. In particular, the seismic sequence that may last for months after the main shock, causing collapses and ulterior damage that in most cases can also damage the transport and communication infrastructure creating important problems for all instruments located in that area and definitely posing a further serious risk for all operators. Moreover, some surveys have to be repeated periodically in order to achieve a final result. On the other hand, by using micro UAVs (Unmanned Aerial Vehicles) for surveying in such particular scenarios, many of these problems can easily bypassed. For example, there are no accessibility problems for an UAV mainly because of its extreme flying capabilities that can really permit the access of virtually any place. Regarding the security, these instruments are fully remotely controlled, so they do not involve any risk for the operators simply because they are in the dangerous area. For these reasons, in this work, we’ll explain the advantages of multirotor UAVs, fully remotely controlled, to acquire roofs and facades of structures in an old city center damaged by a seismic sequence like L’Aquila city
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