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The purpose of this work is to explore the methodological and instrumental review for the realization of a new absolute gravity and height reference network in Sicily. The aim of the network is to contribute to the new reference systems in the Italian area, useful for all the scientific and technological activities related to the gravity field and to the proper definition of a modern height system in this region. The network is composed of 5 stations, evenly distributed forming a large mesh network which roughly covers the entire Sicily. Since four of the five selected stations were measured also in the 1990s, it was also possible to evaluate the long-term behavior (basic requirement for a reference network) of the gravity values at these stations, as well as the ground deformation patterns in the closest GPS/GNSS stations. The observed gravity changes over a time interval of about 30 years at the absolute stations and in the surrounding areas, confirm the stability of the selected areas/sites over the long time.

In this work a Geographic Information System was realised at the service of municipal administration of Palermo, to integrate, manage and store city plan information regarding the urban district Castellammare whereof detailed executive plan of inner city, correlating basic cartography, current urban instrument, cadastral cartography, current restriction schemes, monumental and historical monuments, street numbers and street network. Quantum GIS vers. 1.8 of Free and Open-Source Software (FOSS) community was exclusively utilized to the fulfilment of GIS. To the experimentation and the fulfilment of WebGIS a free server was used in cloud on the Amazon, where a virtual machine, based on MapServer was implemented; the server is reachable online at: http://webppe.it The carried out work allows to achieve relevant goals, for example to fulfil legislative duties about the change of territorial data between different authorities and institutions, to improve the efficacy and efficiency of work carried out inside public administration, to make available to specialists and administrators an instrument, that allows not only the data consultation in every moment through a widespread technology, but also their processing on informative shared set, and finally to reach a large range of users, who don’t have specialized knowledge, sharing different data from different sources but with the same aim: the simplification of technical-administrative activity.

Questo articolo riassume l'esperienza acquisita tra il 2012 e il 2013 dal Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale e dei Materiali dell'Università degli Studi di Palermo per l'indagine integrata del Parco Ninni Cassarà a Palermo, Italia, e la successiva sperimentazione di metodi, strumenti e tecniche basate su ricerche in corso, per quanto riguarda l'acquisizione e l'elaborazione dei dati GNSS e laser Scanner. Il lavoro è stato affrontato al fine di selezionare le tecniche meno costose e veloci da applicare in fase di acquisizione. Dopo la prima monumentazione di sedici punti di controllo distribuiti all'interno del sito e rilevati con ricevitori GNSS, la è stata pianificata e svolta l'indagine in modo NRTK del percorso e degli elementi chiave del parco, attraverso il sistema di acquisizione della Topcon IPS-2 . Si è quindi deciso di sperimentare l’acquisizione MMS del parco attraverso cui è stato possibile acquisire dati sulla morfologia del terreno, le condizioni dello stato dei sentieri, degli edifici che lo costituiscono e le distribuzioni di arredo urbano. Le nuvole di punti ottenute tramite la tecnologia laser scanner sono stati sottoposte sia a procedura automatica e manuale per verificare la rispondenza alle effettive forme reali. This article summarizes the experience gained between 2012 and 2013 by the Department of Civil, Environmental, Aerospace and Materials of the University of Palermo on the integrated survey of Park Ninni Cassarà in Palermo, Italy and the subsequent testing of methods, tools and technique based on current research regarding the acquisition and processing of GNSS data and Laser Scanner. The work has been addressed in order to select the less expensive and fast techniques to be applied in the acquisition phase. After first monumenting sixteen control points distribuited within the site and surveyed by GNSS receivers, the was planned and carried out the survey in NRTK mode of the path and of the key elements of the park. It was therefore decided to experiment with MMS acquisition of the park through which it was possible to acquire data about the morphology of the terrain, the conditions of the state of footpaths, building that laid ahead and distributions of street furniture. The points clouds obtained through this technology have been subjected to both automatic and manual procedure to verify that, finally, their actual descriptive possibilities of real forms.

Il lavoro qui presentato consiste in un rilievo integrato (Topografico/GPS statico/NRTK/Laser Scanner) di un piccolo contesto extraurbano siciliano, Borgo Schirò, noto per le vicende storiche che portarono alla sua costruzione a seguito dell’emanazione della legge n.1 del 2 gennaio 1940, per il superamento del latifondo. Data la natura varia degli elementi da rilevare (edifici, arredo urbano, strade) sono state adottate tecniche di acquisizione diversificate per ognuno di essi, le quali, in forma integrata, hanno permesso un utile confronto finale degli elaborati prodotti, offrendo la possibilità di effettuare analisi qualitative altamente accurate su singoli casi strutturali ed elevati gradi di dettaglio nei casi architettonici focalizzati. Le tempistiche notevolmente contenute e l’esiguità del numero degli operatori necessari alle operazioni di acquisizione ed elaborazione dei dati, rendono soddisfacenti gli esiti raggiunti e chiaramente proficua l’integrazione delle metodologie di rilievo adottate. The work here shown consists of an integrated survey (Topographic/static GPS/NRTK/Laser Scanning) of a small Sicilian extraurban context, Borgo Schirò, known for the historical events that led to its construction, following the issuance of the law n. 1 of January 2nd 1940, for the elimination of the latifondium. Given the different nature of the elements to be surveyed (buildings, urban elements, roads) different techniques of metric data acquisition were used for each of them. The integration of all of them, allowed a useful comparison of the final products, offering the possibility of making highly accurate qualitative analysis on the individual structural cases and a high level of detail in the architectural cases focused. The reduced timing and the very small number of operators needed for data acquisition and processing, make the achieved outcomes satisfactory and the integration of survey methods adopted clearly successful.