286 research outputs found
Fire safety in the Mediterranean
No full textAs coordinator of the PREFER project, Prof. Giovanni Laneve reveals the aspirations of this project which seeks to efficiently and effectively monitor forest fire threat in the Mediterranean region using space-based methods
Small Satellites for Studies in the Lower Thermosphere
No full textAmong the solutions of the problem of filling the gap in aeronomic data at altitudes ranging from 130 to 200 km an experiment based on the exploitation of a tethered satellite deployed for 100 km or more from the Shuttle, has been proposed. However, this solution seems to be still far away from implementation; whereas other methods based on sounding rocket flights and measurements from the ground present problem like the sporadicness and/or scarce spatial coverage of the observations. As an alternative to these previous approaches this paper studies the possibility of using a satellite on a very eccentric orbit (e ≈ 0.5) as a possible alternative, more rewarding in terms of cost and reliability. In addition to the altitude, the Earth's Thermosphere characteristics depend mainly on the latitude and solar local time. Thus we intend to study the rate of variation of these terms as function of the rate of variations of right ascension of the ascending node and perigee argument, in order to evaluate the time necessary for meeting our requirements in terms of latitudinal and solar local time coverage. Then, the characteristics of a suitable orbit in terms of semi-major-axis and inclination can be determined according to the type of study to be performed. Furthermore we intend to analyze the possible difficulties that could arise when the full separation of any effect is afforded with the aim of selecting the orbit, for a single satellite or for a constellation of small satellites, able to minimize the limitations in the spatial and temporal effects separation
Comparing Different Approaches for an Effective Monitoring of Forest Fires Based on MSG/SEVIRI Images
No full textPREFER products are now available
No full textPREFER (Space-based Information Support for Prevention and
REcovery of Forest Fires Emergency in the MediteRranean Area)
was one of the Copernicus FP7 emergency projects funded in
2012. It is uniquely devoted to forest pre- and post-fire management.
The overall goal of the project is to develop and demonstrate a preoperational portfolio of products, based on Earth observation (EO) data, for helping fire management at the Mediterranean scale.
Samples of the PREFER information products are available
to stakeholders through the project Geoserver (www.prefer.cgspace.it) and by contacting CGS S.p.A. ([email protected])
L’inquinamento: I Satelliti come Strumento di Controllo. Il Monitoraggio Ambientale in Val d’Agri.
No full text
Oil spill detection using optical sensors: a multi-temporal approach
No full textOil pollution is one of the most destructive consequences due to human activities in the marine environment. Oil wastes come from many sources and take decades to be disposed of. Satellite based remote sensing systems can be implemented into a surveillance and monitoring network. In this study, a multi-temporal approach to the oil spill detection problem is investigated. Change Detection (CD) analysis was applied to MODIS/Terra and Aqua and OLI/Landsat 8 images of several reported oil spill events, characterized by different geographic location, sea conditions, source and extension of the spill. Toward the development of an automatic detection algorithm, a Change Vector Analysis (CVA) technique was implemented to carry out the comparison between the current image of the area of interest and a dataset of reference image, statistically analyzed to reduce the sea spectral variability between different dates. The proposed approach highlights the optical sensors’ capabilities in detecting oil spills at sea. The effectiveness of different sensors’ resolution towards the detection of spills of different size, and the relevance of the sensors’ revisiting time to track and monitor the evolution of the event is also investigated
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