Calamitous events cause modifications in soil morphology and damages in infrastructures. The knowledge of these modifications can be very useful for the Civil Protection operations. However, survey operations, even if they are supported by the most modern geomatic technologies, are still very difficult, if they are not impossible, because of the adverse operative conditions, like for examples: difficulties for moving in zones subjected to thunderstorms, or short sight conditions determined by volcanic eruptions. Not all of the usual surveying techniques, in these conditions, can be successfully applied. Therefore it is important to arrange instruments and methodologies for surveys, studied and tested for different scenarios, to front timely and effectually the need of the case. Among the most technologically advanced approaches, it is very important to quote laser scanning, very effective and quick to evaluate the damages suffered from operas and infrastructures (buildings, bridges, road embankments, ..), and multispectral images’ analysis, useful for the research of dispersed polluting substances owing to the spill of transported hazmat or for the environmental analysis related to the occur of fires or volcanic eruptions. The contribution of the techniques of aerial and terrestrial photogrammetry, for the definition of the new morphology caused by remarkable hydro-geological damages, is always valid. Besides, it is important to avoid neglecting the new potentialities of the modern robotic topographical instruments, very useful for the traditional approaches for the soils and buildings, and of satellite positioning, that, especially in RTK modality, can find an application for the positioning of helps and even to individuate a perimeter for the interested areas (for example, landslides and flooded surfaces). In this paper it is proposed a wide overview of scenarios and thr consequently necessity of surveying that can be determined after calamitous events, with a particular attention to the effects induced by seismic events and hydro-geological damages, forest fires and volcanic eruptions; case by case, it is suggested, on the basis of precedent experiences achieved in this field, the most suitable techniques of surveying and of data management.
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