Marco Roggero

Politecnico di Torino | polito · DAD - Department of Architecture and Design

In this paper station coordinate time series from three space geodesy techniques that have contributed to the realization of the International Terrestrial Reference Frame 2014 (ITRF2014) are compared. In particular the height component time series extracted from official combined intra-technique solutions submitted for ITRF2014 by DORIS, VLBI and G...

The work describes the analysis conducted on the IGS REPRO1 coordinate time series, in order to detect GNSS permanent stations periodic behavior. Frequency analysis requires cyclostationary time series, while observed coordinates time series are not cyclostationary because of discontinuities of different kind and origin and of long term linear or n...

The accuracy of Global Positioning System (GPS) time series is degraded by the presence of offsets. To assess the effectiveness of methods that detect and remove these offsets, we designed and managed the Detection of Offsets in GPS Experiment. We simulated time series that mimicked realistic GPS data consisting of a velocity component, offsets, wh...

This manuscript focuses on a quality assessment of DJI’s new sensors: the Zenmuse L1 and P1, which are LiDAR and photographic payload sensors, respectively, for UAVs/UASs. In particular, metric and statistical analyses aim to evaluate the data obtained from different 3D survey instruments. Furthermore, we compared these sensors with TLS data derive...

The present work discuss the digitization and georeferencing of the cartographic heritage preserved in the public archives, with special attention to image quality, support deformation analysis and metric content verification. The use of the photogrammetric techniques is suggested, with some applications to the Sabaudian cadastre.

In this work we have compared the Up component time series reprocessed in view of the new ITRF2014. The solutions that we have considered are the combinations of individual submissions of the Operational Analysis Centers (ACs) as official IVS, IGS and IDS products. We have modelled time series as discrete-time Marcov processes, we have detected and...

In laser scanner architectural surveying it is necessary to extract orthogonal projections from the tridimensional model, plans, elevations and cross sections. The paper presents the workflow of architectural drawings production from laser scans, focusing on the orthogonal projection of the point cloud on solid images, in order to avoid the time co...

Orthonormal matrices, Procrustes and quaternion analysis are closed form solutions of the configuration matching problem, common in geodesy as in the datum transformation problem. Literature reports more Procrustes based geodetic applications than Quaternions, which are more used in other application fields, such as aerospace navigation, robotics a...

The paper considers the problem of object segmentation and shape recognition in discrete noisy data. Two different algorithms combine region growing techniques with principal component analysis. The proposed algorithms are applied to a data set from airborne laser scanners.

The aim of time series analysis is to distinguish between stochastic and deterministic signals, which are generated by different sources and mixed in the data time series. Before analyzing long term linear trend and periodic effects, it is necessary to detect and remove time series discontinuities, often undocumented. Discontinuities can occur in t...

This article depicts the development and test of a low cost wireless sensor network intended for use in severe environmental conditions. The test site is a serac located at 4100m above a populated area. It was needed to put in place a monitoring system able to trace displacement continuously and in all weather conditions. To achieve this goal start...

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Nella fotogrammetria a grande e grandissima scala l'acquisizione dei dati primari, immagini metriche e parametri di orientamento, può essere convenientemente effettuata anche con mezzi di basso o medio costo alla portata di piccole aziende. Tale possibilità è dovuta particolarmente all'attuale disponibilità di piattaforme aeree a basso costo, con o...

The International Ellipsoid 1924 was adopted in Madagascar in 1925 for the definition of the Tananarive 1925 datum, while Laborde projection have been used for Madagascar cartography in 1926. Direct and inverse Laborde formulas are reviewed to convert cartographic and geodetic coordinates. The Hotine approximation of the Laborde projection is also...

GNSS have been widely used to monitor crustal deformation with a high precision. In this chapter, the workflow of deformation monitoring by continuous GNSS observations is addressed. First, the permanent GNSS network characteristics and structure are described. Second, the GNSS observation data are processed by the Bernese software and correspondin...

In kinematic observation processing the equivalence between the state space approach (Kalman filtering plus smoothing) and the least squares approach including dynamic has been shown (Albertella et al., 2006). We will specialize the proposed batch solution (least squares including dynamic), considering the case of discrete-time linear systems with...

Positioning services based on GNSS Permanent Networks (PNs) disseminate the reference frame to users; hence the networks must be adjusted by constraining the ITRF coordinates of some permanent stations (PS), with the satellite orbits and clocks constrained to the values published by the International GNSS Service (IGS). Furthermore, the positioning...

SOMMARIO Un servizio di posizionamento basato su una rete di SP GNSS contribuisce a disseminare, sia in tempo reale sia per il post-processamento, un sistema di riferimento agli utenti. A tale scopo, in generale si può affermare che la rete dovrebbe essere inquadrata nel sistema di riferimento globale, materializzato dalla rete IGS; nell'operazione...

SOMMARIO Una rete di stazioni permanenti deve fornire servizi su tre diverse scale temporali: in tempo reale, il giorno successivo ed entro una settimana dall'acquisizione. L'elaborazione di dati in tempo reale prevede un'ottimizzazione tra tempo di latenza e precisione dei risultati; in questo caso il controllo di qualità può essere eseguito esclu...

SOMMARIO Un servizio di posizionamento basato su una rete di SP GNSS contribuisce a disseminare, sia in tempo reale sia per il post-processamento, un sistema di riferimento agli utenti. A tale scopo, in generale si può affermare che la rete dovrebbe essere inquadrata nel sistema di riferimento globale, materializzato dalla rete IGS; nell'operazione...

Kinematic GPS observation processing requires robustness, especially in noisy environments. Ambiguity resolution robustness can be improved with multi base approach and parameters constraining. We consider a discrete-time linear systems with known dynamics, produced by a GPS antenna array mounted on a vehicle. Simulated and real data examples are g...

Has been demonstrated that, alternatively to a Kalman filtering plus Kalman smoothing solu-tion can be used a different approach, called batch solution by the authors (Albertella et al., 2006). This method, with some algebraic expedient, allows obtaining least squares solutions equivalent to Kalman solutions with a comparable computational load. Ha...

The purposes of a positioning service based on a network of permanent stations equipped with GNSS receivers is to provide data and products for land survey, geodetic monitoring and other technical and scientific applications in the covered area. The supply of data and products is often accompained by a consulting service. The design, implementation...

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...

Riassunto > La nota descrive i primi risultati di un Progetto di ricerca italiano sul posizionamento inerziale in fotogrammetria. L'articolo riguarda in particolare la qualità ottenibile nelle misure fotogrammetri-che con fotogrammi orientati direttamente e acquisiti in un contesto produttivo. Anche se la fotogrammetria supportata da GPS/IMU è abba...

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...