Alberto Cina

• Polytechnic University of Turin

Caves are one of the most important and well-known geological features in the world, an environmental and cultural heritage, as well as an important economic resource for many countries. Their scientific and aesthetic value is often threatened by tourism, which unfortunately exposes them to a series of risks of degradation and, sometimes, irreparab...

Performing two independent surveys in 2016 and 2017 over a flat sample plot (6700 m 2), we compare snow-depth measurements from Unmanned-Aerial-System (UAS) photogrammetry and from a new high-resolution laser-scanning device (MultiStation) with manual probing, the standard technique used by operational services around the world. While previous comp...

Global Navigation Satellite Systems (GNSS) technology has been a consistent alternative to monitor and detect structural deformation using geodetic receivers. The role of low cost GNSS receivers have been explored in recent years and this study proposes the use of two such receivers as master and rover respectively to detect fast deformations. Sing...

Photogrammetric surveys using Unmanned Aerial Systems (UAS) may represent an alternative to existing methods for measuring the distribution of snow, but additional efforts are still needed to establish this technique as a low-cost, yet precise tool. Importantly, existing works have mainly used sparse evaluation datasets that limit the insight into...

Virtual RINEX (VR) is a common product for Global Navigation Satellite System (GNSS) post-processing applications, useful if the distance between the rover and master is greater than 30 km. Many studies have been conducted in order to analyse the content of this kind of data, but few have proved the positioning performances obtainable in particular...

The purpose of this work is to propose a new redefinition of cadastral boundaries using GNSS equipment and cadastral maps. These maps are the 'original' maps of the Italian Land Cadastre, the first cartographic support built directly from measures carried out by technicians during implantation of the Italian land cadastre. They are called 'original...

The differential positioning has got a great development in recent years, thanks to the appearence of GNSS CORSs (Continuous Operating Reference Stations) networks. One of the main goals of these networks is to give the possibility to the users to extend the differential positioning (whether in real time or post-processing) up to 25-50 km, allowing...

Italy is deeply afflicted by geo-hydrological risk, where a predominant part of its area is under risk.Recently, advanced research and sensors have played an important role in realizing automatic systems for landslide monitoring and to alerting. The cost of these systems, considering all parts, limits their use and the cost of each sensor influence...

The Unmanned Aerial Vehicle (UAV) technology has been recently used to develop a pattern measurement system for low-frequency arrays in their real installation conditions. This paper presents the most important results that have been obtained on the Italian Medicina Array Demonstrator (MAD).

Over the last twenty years, positioning with low cost GNSS sensors has become widespread worldwide at both commercial and academic level. The Geomatics Research Group of DIATI at the Politecnico di Torino has carried out several experiments in order to evaluate the precision achievable when using mass-market GNSS receivers with a network of permane...

The territory of Italy is seriously afflicted by hydrological risk, with 82% of its area affected by this phenomenon. In recent years, technologies and advanced research have played an important role in realizing complex automatic systems devoted to landslide monitoring and to alerting the population. Sometimes, the cost of these systems (communic...

This letter presents a radiation pattern verification system for low-frequency antennas in their operative conditions, e.g., on the ground, next to other elements, etc. It is a far-field setup using a properly equipped micro unmanned aerial vehicle (UAV) as a test source. The micro UAV can perform an autonomous flight. Its absolute position is meas...

Among the various technologies, sparse Aperture Array for Low frequency (AA-Low) are the system operating between 50-450MHz, that will be installed for the first receiving portion of SKA. This paper presents the Italian experiences and results concerning that field as part of the AADCC (Aperture Array Design Construction Consortium) with particular...

Negli ultimi anni la pratica professionale in ambito architettonico-edilizio richiede competenze sempre più specifiche e, spesso, tempistiche estremamente ridotte, in una continua ricerca di strategie procedurali fondate su piattaforme integrate e condivise, adatte a gestire la relazione rilievo-progetto. Un caso studio sul tema proposto si riferis...

In recent years, GPS chipset technologies have been changed completely in order to allow for positioning under extreme conditions, such as in indoor environments. The necessity of always having a positioning capability is rising, but what accuracy level can be reached? Some specific tests have been carried out to estimate the limits for indoor posi...

Road cadastre mapping is a topic of current interest in Italy because each Region has to prepare one. The main problem is to obtain an accurate low cost product but in a brief operational time. Nowadays, many tools exist to solve this problem: one of these is the mobile mapping. Different integrated systems (GNSS, IMU, video camera) are available t...

The concept of reference system is changing because the number of regional GNSS networks for real time positioning on the national area is increasing. Nowadays, surveys are carried out, not only into a 'static' reference system, whose coordinates stay unchanged for several years, but also respect to a dynamic reference system realized by GPS perman...

I ricevitori GNSS di solo codice o in singola frequenza sono strumenti di costo limitato e dunque di potenziale grande diffusione nel mondo delle applicazioni professionali. Se utilizzati in presenza di una rete che fornisce correzioni differenziali in tempo reale possono raggiungere precisioni metriche o submetriche in modalità differenziale e con...

Total stations and GPS receiver are normally used separately for terrestrial survey of cultural heritage, and the natural development has been the production of a single instrument where both a GPS and a total station work together. Several problems, such as the different reference systems used by the two techniques, require a geodetic approach to...

Le tecniche di posizionamento RTK di rete sono oggi impiegate nelle campagne di misura GPS in alternativa alle tradizionali tecniche RTK, garantendo risultati più affidabili e di maggior precisione anche a distanze elevate dalle stazioni di riferimento. L'architettura di rete, l'installazione e la gestione sono state studiate da due anni per mezzo...

Precise RTK positioning is usually performable only on short length bases, to limit distance correlated biases, as atmosphere and ephemerides. However, it is possible to recover some residual biases also over long distance using appropriate area models, improving the performances of long base RTK positioning up to 100 km base length. Permanent refe...

In cadastral GIS updating, quickness and economization of surveying are important but contrasting requirement. However high precision is usually not required. This paper present some results, obtained processing single and double frequency observations with ALARIS, a self made software based on dynamic Kalman filter, and with the commercial softwar...

We have studied the chance to estimate atmospheric biases in the GPS observables using non dif- ferential algorithms, known as one way techinques. This work is framed in a most ambicious pro- ject, to estimate these biases on the area enclosed by a reference station network, and to perform rover station positioning by Network RTK. Premessa Nel posi...

The starting point of any GPS application is the satellite positions computation. The present paper deals with the necessary theoretical concepts, starting from the navigation message standard format data (RINEX, RTCM etc.). The purpose of this paper is not to present new procedures: it aims instead to explain many concepts, which are often present...

Mobile mapping vehicles (MMV) are the most used technology to acquire spatial information (images, cloud of points) but it is very expensive (>100M€) and it can be used only by "expert" users. Considering the existing MMV, a low cost (<40k€) solution have been realized, using 3 GNSS receivers, 3 webcams and 1 IMU. All sensors are on a rigid and cal...

To verify both the RTK positioning performances, and the products broadcasted by a Real Time GNSS Network (RTGN), the method usually used is to perform the positioning in different points of the territory covered by the RTGN. Different it is the case in which the efficiency of a continuous kinematic positioning has to be verified, due to the seriou...

Una completa interoperabilità tra reti permanenti regionali GNSS differenti è ottenibile solo se queste sono inquadrate nello stesso sistema di riferimento. Inoltre è opportuno fornire all'utenza coordinate finali nel sistema di riferimento ufficiale nazionale (IGM95). Al fine di valutare quali siano i parametri e le trasformazioni ottimali tra le...

Regione Piemonte, is proceeding to the realization of the GNSS regional permanent stations network for the real time and the post processing positioning services, starting from the consolidated experience of the experimental Politecnico di Torino network. After some years of experimentation Regione Piemonte has decided to acquire its own service st...

The geodetic and real time use of cheap GPS receivers. In this paper we show the results obtained with some single frequency GPS very cheap (300-500 €): the so called "handled GPS". The first results are relative to network whose maximum side is 7 km, statically GPS surveyed . We analyse the errors and the precision (due to the acquisition time) us...

Riassunto I primi studi relativi all'allestimento di un veicolo rilevatore sono stati realizzati negli anni '80 in Canada; da allora, tali veicoli sono stati impiegati in diversi campi e con diverse tipologie di integrazione GNSS/INS. Una caratteristica che accomuna questi dispositivi è l'elevato costo dei sensori adottati, della realizzazione e ma...

Riassunto Gli enti territoriali (regioni, province, …) che hanno per competenza la gestione della rete stradale devono a termini di legge (D.L. n° 285/92, Nuovo Codice della Strada, D.M. 01.06.2001 "Modalità di istituzione ed aggiornamento del Catasto delle Strade") dotarsi di un catasto strade, realizzandone uno ex-novo o aggiornando quello esiste...