Papers by Pier Giorgio Marchetti
Electronics Letters, 1985
... beam A vectors to be nomin-ally horizontal/vertical at the ground would tend to balance the X... more ... beam A vectors to be nomin-ally horizontal/vertical at the ground would tend to balance the XPD ... The corresponding tilt angles within the east spot beam would be between 15-5° and 40-5°. However ... Received power was sampled at a rate selectable on demand from 1 to 10 Hz. ...
IEEE Transactions on Geoscience and Remote Sensing, 2003
In this paper, we demonstrate the concepts of a prototype of a knowledge-driven content-based inf... more In this paper, we demonstrate the concepts of a prototype of a knowledge-driven content-based information mining system produced to manage and explore large volumes of remote sensing image data. The system consists of a computationally intensive offline part and an online interface. The offline part aims at the extraction of primitive image features, their compression, and data reduction, the generation of a completely unsupervised image content-index, and the ingestion of the catalogue entry in the database management system. Then, the user's interests-semantic interpretations of the image content-are linked with Bayesian networks to the content-index. Since this calculation is only based on a few training samples, the link can be computed online, and the complete image archive can be searched for images that contain the defined cover type. Practical applications exemplified with different remote sensing datasets show the potential of the system.
The amount of literature indexed in bibiiographic and text collections contìnues to grow, is comp... more The amount of literature indexed in bibiiographic and text collections contìnues to grow, is complex and multidisciplinary in nature. The access to such sources of information, their consultation, is required by rn.ore and more professionals. T ools like persona! cornputers and high speed networks to connect to on--line catalogues and bibliographic collecrions are easily available. Neverthe!ess a professional knowledge of collection contents, indexing methods and query language is normally required to aBow a fmitful access to large text collectìons and retrieval of reievant inf ormation. This paper addresses the personal computer version (MS Windows) of the BRAQVE (BRowse And QUEry) imerface designed to overcome tbe above mentioncd problems and give significant results in the information gathering process to the pmfessiona1 information hunter as well to the occasionai searcher. BRAQUE relies on the implementation of a two ìevel hypertext model to support the hypertext metaphor in a ...
PLANETARY IMAGES. Jon Earl, Agustin Chicarro, Christian Koeberl, Pier Giorgio Marchetti, and Mart... more PLANETARY IMAGES. Jon Earl, Agustin Chicarro, Christian Koeberl, Pier Giorgio Marchetti, and Martin Milnes, LogicaCMG UK Ltd (Space & Defense Division), Chaucer House, The Office Park, Leatherhead, Surrey KT22 7LP, United Kingdom ([email protected]; [email protected]); ESA/ESTEC, Scientific Programme, Keplerlaan 1, 2200 AG Noordwijk, the Netherlands ([email protected]); Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria ([email protected]); ESA/ESRIN, Earth Observation Programme (EOP-GDR), Via Galileo Galilei, I-00044 Frascati, Italy ([email protected]).
The Heterogeneous Missions Accessibility (HMA) project is a joint activity of the European and Ca... more The Heterogeneous Missions Accessibility (HMA) project is a joint activity of the European and Canadian Space Agencies lead by ESA through its Ground Segment Coordination Body (GSCB). It aims to provide a seamless and harmonised access to heterogeneous Earth observation (EO) datasets from multiple mission ground segments. To achieve this goal of interoperability, the HMA project is developing standardised metadata descriptions at collectionand product-level, as well as standardised network service interfaces for data discovery, ordering, planning, user management, and data access. These interfaces will be implemented in the EO Data Access and Integration Layer (DAIL), providing an integrated, harmonised access across multiple mission ground segments.
In joint Italian-Chinese communications studies, 11.5-GHz signals from the SIRIO satellite were r... more In joint Italian-Chinese communications studies, 11.5-GHz signals from the SIRIO satellite were received in Beijing at low elevation. Preliminary analysis of the data recorded in both Rome and Beijing shows strong amplitude scintillations. Results of spectral analysis of these data seem to confirm low elevation experimental results obtained from other satellites. Plots of spectral density, time behavior, and log amplitude power spectra are given.
This paper describes an environment for the integration of EO and GIS services supporting the pro... more This paper describes an environment for the integration of EO and GIS services supporting the provision of EO services and “information products” closer to customer expectations and processes. The paper explains how the adoption of readily available XML-based Web standards and protocols in an open environment can facilitate the integration. 1. The Integration Problem Ongoing efforts to broaden the European EO market highlight the need for EO services and “information products” closer to customer expectations and processes (easily understandable and ready-to-use without further manipulations). Today the transformation from basic products (e.g. images) into information is performed by a small number of specialised companies operating independently in specific application domains. This separation increases costs and leads to a time consuming process, which prevents the optimization of allocated resources. The problem limits the deployment of cost effective EO services, in particular wh...
Despite the success in many scientific areas, Earth Observation (EO) has not yet evolved into a r... more Despite the success in many scientific areas, Earth Observation (EO) has not yet evolved into a real, self-sustaining, service industry. Ongoing efforts to broaden the European EO market highlight the need for EO services and “information products” closer to customer expectations and processes (easily understandable and ready-to-use without further manipulations). In general terms there is the need to move from a “data” or “product” centric vision of EO ground segments to a ”service” oriented approach. Today the lack of an integrated, transparent and service oriented infrastructure adds a further barrier to the transformation from basic EO products (data, images) into information and services. This transformation is performed by a relatively small number of specialised companies operating independently in specific application domains. This separation increases costs and leads to a time consuming process, which prevents the optimisation of allocated resources. Furthermore the exploit...
The aim of the Primitive Feature Extraction (PFA) project 1 is to demonstrate that feature extrac... more The aim of the Primitive Feature Extraction (PFA) project 1 is to demonstrate that feature extraction and analysis of EO data makes it possible to exploit the large volumes of various types of satellite data more efficiently, and through this to foster the scientific analysis of mission wide data sets. The project addresses emerging methods and tools for data product features and information extraction, in view of possible implementations for enriching data description and easing the use of archived data[1]. For this purpose, a number of EO data exploitation scenarios are being implemented to test the possibility of systematically extracting EO product features and demonstrate the usefulness of the performed feature extraction in the data selection process, both for the scientist and for the users of EO products. The project has selected to implement feature extractors for forest mapping, urban mapping, algal blooms and flood mapping. The entire EO archives from optical and SAR sens...
Annales des Télécommunications
The outage probability is analytically evaluated for a digital transmission CPSK system (four and... more The outage probability is analytically evaluated for a digital transmission CPSK system (four and eight phases) operating at 140 Mbit/s. The presence of the transmitting and receiving Butterworth filters, the multipath transmission channel as well as the thermal noise are all considered. A channel model with a two parameters transfer function is assumed.
IEEE Geoscience and Remote Sensing Magazine, 2016
Information Processing and Management an International Journal, 1992
This paper presents a design and implementation project based on a two-level conceptual architect... more This paper presents a design and implementation project based on a two-level conceptual architecture for the construction of a hypertext environment for interacting with large textual databases. The conceptual architecture has been proposed to be used for a semantic representation of the informative content of a collection of documents and for the organisation of the document collection itself. The hypertext environment is based on a set of functions that permits one to exploit the potential capabilities of the two-level architecture. Those functions are presented in detail. The paper reports some results of a more general project whose final goal is the definition of a new model for information retrieval: a model with information retrieval capabilities embedded within a hypertext environment. Finally, an outline is presented of the characteristics of a prototype, named HYPERLINE, of the hypertext environment. This prototype has been developed by the Information Retrieval Service of the European Space Agency (ESA-IRS)
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Papers by Pier Giorgio Marchetti