Aurelio Stoppini

• University of Perugia

This paper presents a comparative analysis of commercial Precise Point Positioning-Real Time Kinematic (PPP-RTK) and Network RTK (NRTK) services for vehicle-borne kinematic positioning in urban and suburban environments in Central Italy. The study aimed to investigate the performance of low-cost GNSS devices by employing the PPP-RTK technique, whic...

In recent years, the possibility of using interoperable global constellations, the growing number of Continuously Operating Reference Stations (CORS) and the technological progress of instrumentation, computing algorithms and GNSS products are significantly marking the evolution of the various satellite survey techniques and the diffusion of mass-m...

The aim of this research is to complete gradually the survey of the monumental complex of the Capitolo of San Lorenzo, still ongoing, with particular attention to the church, the attic, the upper courtyard and the lower one, including the hypogeal rooms of the Capitular Museum, where important and impressive ruins as a portion of Etruscan terracing...

This article presents and analyzes the methodologies and results of the survey of an Etruscan archaeological site (the Necropolis of Palazzone) with tombs dug into the ground on a slope belonging to the Perugia hill, in central Italy. The survey presented particular difficulties, since the underground rooms are numerous, small, and not illuminated,...

The Engineering Department of the University of Perugia and the Architecture Department of the University of Florence have started a research project on the ancient city gates of Perugia, belonging to the Etruscan city, dating between the third and second centuries b.C., and to the subsequent city wall completed in the twelfth century. In this pape...

A large part of the archaeological remains still to be discovered and excavated are not in remote and depopulated areas of the earth but are often beneath urban centres that have buried them with centuries of debris and later constructions. Excavating in these contexts is much more complex than digging in rural or sparsely inhabited areas because o...

The paper reports the results of a research on validation and optimization of automatic and semi-automatic guidance systems for agricultural machinery based on Real-Time positioning services provided by GNSS Networks (NRTK). The research is based on experimental campaigns performed on test areas, located in Umbria (central Italy) on the land of six...

The area of the monumental complex of the Cathedral and the rectories of S. Lorenzo, located on the “acropolis” of Perugia, has been for more than two thousand years the main religious and civil reference site of all populations since the origin of the city of Perugia. The aim of this research was to survey the monumental complex of the Cathedral o...

The work in this paper illustrates an experimental application for geosciences by coupling new and low cost photogrammetric techniques: Gigapixel and Structure-from-Motion (SfM). Gigapixel photography is a digital image composed of billions of pixels (≥1000 megapixels) obtained from a conventional Digital single-lens reflex camera (DSLR), whereas t...

This paper presents the development of a system for realizing interactive exhibitions in the context of a science and technology center. The core functionality of the system is provided by a positioning subsystem comprised of a fixed infrastructure of transmitters and a sensor worn by a user. The operating principle of the positioning system is bas...

La presentazione mostra i risultati di indagini geofisiche (GPR ed ERT) effettuate sulle mura di Amelia. Pubblicazione di riferimento: http://www.sciencedirect.com/science/article/pii/S0926985116300337?via%3Dihub

The Tempio della Consolazione in Todi (16th cent.) has always been one of the most significant symbols of the Umbrian landscape. Since the first times after its completion (1606) the structure has exhibited evidences of instability, due to foundation subsiding and/or seismic activity. Structural and geotechnical countermeasures have been undertaken...

Image processing and classification techniques are widely used for land use definition. They can also provide interesting applications in fluvial geomorphology, for outlining morpho-sedimentary features (bars, channels, banks and floodplain) at various temporal stages, in order to monitor the evolution of river systems. Frequent monitoring is espec...

Image processing and classification techniques are widely used for land use definition. They can also provide interesting applications in fluvial geomorphology, for outlining morpho-sedimentary features (bars, channels, banks and floodplain) at various temporal stages, in order to monitor the evolution of river systems. Frequent monitoring is espec...

We investigate a portion of the ancient (VI and IV century BC) polygonal walls of Amelia, in Central Italy. After the collapse of a walls portion occurred in January 2006, a wide project started in order to monitor their external facade and inspect the characteristics of the internal structure, currently not clearly known. In this specific case, th...

The paper presents the first results of a work aimed to develop automatic procedures, and/or semi-automatic, for the morphological and sedimentary analysis of riverbeds (made through multispectral aerial photographs) and to define the morphological changes (plano-altimetric) of the river, by comparison with previous surveys. The methodology has bee...

This work presents an analysis of the applicability of synthetic aperture radar (SAR) interferometry to landslide monitoring. This analysis was carried out by using different interferometric approaches, different spaceborne SAR data (both in the C-band and in the X-band), and in situ global navigation satellite system (GNSS) measurements. In partic...

The kinematic survey with GNSS measurements has known a good diffusion in Italy especially after the new Italian laws about road cadastre. The Laboratory of surveying of Perugia University has deepened the aspect of the road axis survey with GNSS measurements. The analysis has started from a kinematic survey with GNSS measurements at a sampling rat...

The paper describes the results of a series of tests carried out with different sensor platforms (geodetic GNSS with or without RTCM corrections, low cost GNSS, integrated GNSS/INS) in a real urban environment with a relevant presence of satellite obstructions (tall buildings, trees, ...) causing frequent and prolonged GNSS outages. The different s...

A wide area of the Assisi town, in Umbria (central Italy), is interested since its first edification (1950–1960) by an extensive landslide. The rate of motion is very slow (around 1cm/year), but the deformations accumulated for almost 60years have produced considerable damage to many private and public buildings, including the civic hospital and an...

The paper describes the most recent experiences of the DICA Laboratory of Geomatics on integrated positioning systems based on low cost sensors. The study is finalised to an application for the real time monitoring and managing of a fleet of buses for public and scholastic transport service. The hardware and software components selected for the imp...

Here we report the results of the analysis of a GPS velocity field in the Umbria–Marche Apennines (central Italy) obtained from the integration of diverse geodetic networks. The velocity field obtained shows a high degree of consistency both spatially and in terms of comparison with independent information, despite the limited time span of some GPS...

Network based real time kinematic (NRTK) positioning reduces or eliminates the communication, integrity and affordability problems associated with semi automated guidance of bulldozers, excavators and other equipment at centimeter level accuracy. The new procedure addresses adequate height control, a crucial factor for machine control users. This e...

The DICA (Department of Civil and Environmental Engineering) of Perugia University currently operates two local GNSS permanent stations networks in central Italy. These networks supply various types of positioning services, which are currently being used mostly by surveyors and mapping agencies. This kind of networks also have a strong potential fo...

The ancient city of Amelia (Umbria, central Italy) is surrounded by monumental walls built by Italic civilization between VI and I V century BC. The walls of Amelia have an exceptional historical and architectonic interest d ue to their particular construction made of very large limestone blocks cut in polygonal shape, assembled with no cement. Rec...

This article illustrates the methods used to construct and compute two new geodetic networks set up in recent years by the Region of Umbria in collaboration with the University of Perugia. The first of the two networks is a «passive» type network, which consists of some hundreds of planimetric and altimetric vertexes evenly distributed throughout t...

The surface movements of a landslide involving an urban area of the Assisi town, in central Italy, have been measured since 1995 using the GPS technique. This paper presents some design aspects of the GPS network, and a statistical analysis of three annual survey campaigns.

In the present paper, the problems connected with the archiviation of geodetic data (such as coordinates, heights, benchmark construction details, images, ...) are examined, referring to the relational database archiving model. A special attention is given to the connection of the geodetic database to a GIS support. Some general characteristics and...

Working with GPS, a large amount of data is often produced. In complex works, like the control networks, where many stations are involved, measurements are repeated more and more in time, and post-processing is performed with different softwares and/or options, in order to optimize the solutions; it is therefore very important to carefully archive...

The problem of the effect of surplus measurements on the precision of network vertices is considered in a research programme for the optimisation of GPS networks. Some networks were carefully observed and those with the highest possible redundancy are analysed. The problem is then approached by simulating these networks and comparing simulations wi...

The TYRGEONET (TYRrhenian GEOdetic NETwork) project was set up in 1990 by a group of institutions from different countries to monitor crustal deformations in the Central Mediterranean area by using geodetic spatial techniques. Because the Central Mediterranean area is interested by a strong geodinamical activity, mainly related to the broad scale c...

The report analyses the post-processing of GPS measurements. The necessary procedures are briefly resumed and then applied, step by step, to a real surveying case. Reference is made to the use of GPS in static mode, that is the most common mode in geodetical-topographic applications of the system; however, many of the considerations remain valid al...

This paper examines the problem, basic using GPS system, of direct and inverse transformation from geographic coordinates and ellipsoidal height to Cartesian coordinates related to a system with origin in the center of the ellipsoid. From the expressions of the above problem is derived a program for portable calculators, here the inverse (from Cart...

This work presents the results of a GPS measurement campaign on levelling bench- marks part of the Italian National precise levelling network. The interested area has an extension of some tenths of kilometers around the GPS permanent station of Perugia (central Italy). A comparison has been made between the geoid undulations derived from GPS-LEV an...

Riassunto In questo lavoro vengono presentate una serie di applicazioni delle reti regionali e locali di stazioni permanenti GPS/GNSS, da problematiche a carattere generale e scientifico come la georeferenzia-zione e l'inquadramento nei vari datum ad altre più specifiche come l'aggiornamento catastale o il catasto stradale. A scopo di esemplificazi...