Search results for " gps"
showing 10 items of 60 documents
Radiometric and geometric evaluation of the capabilities of the new airborne digital photogrammetric sensors
2008
In this paper the theoretic and practical points of view about the applications of the modern digital airborne sensors in the photogrammetry and remote sensing fields are described. The first part of the paper describes the theoretic matter, the second one shows the first results regarding the carried out elaborations on an image of Palermo acquired by digital airborne sensor LH System ADS40. Besides the research has examined most of sides regarding the trilinear sensor and it has highlighted the capabilities and limitations respect to the traditional analogical system and the matricial CCD sensor.
Confronto tra un sistema laser e due sistemi GPS per il trapianto meccanizzato di barbatelle
2001
The transplanters of grafted vines at present on the market are equipped with laser transmitters and receivers, which ensure the parallelism among the vineyard rows. These high cost instruments cause some operational problems: not operational return way of the machine, the need for more than one surveyed point when the soil shape is irregularar, the need of two operators, besides the machine driver, etc. The aim of this work is to assess the accuracy of GPS systems in order to use them in place of the laser systems. The distances among the grafted vines and the distances among the vineyard rows were measured using two positioning systems (a differentially corrected GPS system - DGPS) and a …
Structural architecture and active deformation pattern in the northern sector of the Aeolian-Tindari-Letojanni fault system (SE Tyrrhenian Sea-NE Sic…
2017
Framed in the current geodynamics of the central Mediterranean, the Aeolian-Tindari-Letojanni fault system is part of a wider NW-SE oriented right-lateral wrench zone which accommodates diverging motion between regional-scale blocks located at the southern edge of the Calabrian Arc. In order to investigate the structural architecture and the active deformation pattern of the northern sector of this tectonic feature, structural observations on-land, high and very-high resolution seismic reflection data, swath bathymetry data and seismological and geodetic data were merged from the Lipari-Vulcano volcanic complex (central sector of the Aeolian Islands) to the Peloritani Mountains across the G…
From land to sea: multi-scale and multi-resolution analysis of active deformation and seismogenic sources around the coasts of Southern Italy
2016
During the last decade, we have blended our individual skills to form a research group devoted to investigating active crustal deformation in areas adjacent to the coast of Southern Italy, with the aim to bridge the gap between the onshore and offshore realms. Our research is based on a multi-scale and multi-resolution approach that includes high-resolution seismics, coastal morpho-tectonics and structural geology, complemented by seismicity, Global Positioning System and InSAR. Need and opportunities of such an endeavor arise from the basic observation that, although most population centers lie close to the coastal areas, very little is known about active structures at the sea. However, hi…
Realizzazione di una rete di monitoraggio geodetico della frana di Scopello (Sicilia nord-occidentale)
2006
L’area di Scopello (Sicilia Nord-Occidentale) è da tempo oggetto di studi che, sulla base di osservazioni e rilievi geomorfologici, hanno consentito sia di riconoscere la presenza di frane superficiali e di fenomeni di deformazione gravitativa profonda di versante (DGPV), sia di ipotizzare cause e tipologie dei movimenti in atto, giungendo alla definizione di un primo modello interpretativo. I movimenti franosi si sviluppano lungo i settori costieri dell’area di Scopello, dove è a giorno un piano di sovrascorrimento del Miocene superiore, che vede la sovrapposizione di unità rigide, costituite da successioni carbonatiche meso-cenozoiche, su unità duttili, costituite, al tetto, da argille-ma…
Mobile Mapping System: case study of the Messina-Palermo motorway layout
2009
This paper presents the first results of the MMS (Mobile Mapping System) survey on the geometry of the A20 italian motorway Messina-Palermo. The layout parameters are the essential data for an effective management of a single or a road network. In particular these parameters are essential for applying the Design Consistency methodology to proposed or existing road infrastructures; through this methodology the road manager can make sure that the road characteristics are adjusted to the driving behaviour of motorists by analysing the relationship between horizontal and vertical alignment and the design and operating speed. Both the difficult finding of the road design schemes, particularly in…
COMPARISON BETWEEN VEHICLE SPEED PROFILES ACQUIRED BY DIFFERENTIAL GPS AND UAV
2014
Traffic microscopic simulation models are able to represent traffic conditions and their evolution over time. They take into account the geometrical aspects of transport infrastructures, driver behavior and, step by step, the vehicles’ movements on the road network. The most widespread applications of these models are referred to accident management, route guidance problems (possibility of evaluating control strategies in real time), adaptive control of traffic-light and ramp metering (management and control of the ramps and flow). To accomplish this goal observational data of vehicles’ kinematic characteristics have to be acquired. These elements are not always easily available. In scienti…
Rilevamento e modellazione 3D del teatro antico di Palazzolo Acreide. Problematiche nell’elaborazione e gestione dei dati laser-scanning.
2011
Lo studio descrive le operazioni di rilevamento con tecniche topografiche, laser-scanning e fotogrammetriche, condotte a fini conoscitivi e divulgativi sul teatro antico del sito archeologico di Palazzolo Acreide (SR). Il risultato del rilievo è consistito nella realizzazione di un modello 3D foto realistico del teatro, georiferito nel sistema cartografico UTM-ED50 con l’impiego di tecniche GPS. Come ben noto, le procedure per la realizzazione di modelli di beni culturali ad alta risoluzione, contenenti dati metrici e qualitativi sullo stato di conservazione dei beni stessi, richiedono tuttavia operazioni di editing, alle volte assai onerose dal punto di vista computazionale ed operativo. I…
Time series analysis in the UNIPA NRTK GNSS network
2010
Today GNSS coordinate time series analysis was evaluated to determine accurate position. The aims of this project is a preliminary combination of raw data to obtain the initial accurate parameter estimates of the stations in order to compute error bounds for all parameters of the model. Case of study is UNIPA NRTK GNSS: this network is located in Italy, central western of Sicily and is composed of nine permanent stations. The coordinates of the reference stations were established in IGS05 (epoch 2005.0) and ETRF89 (epoch 1989.0) system. Recently, two reference stations have been included and calculated in the Italian GPS dynamic permanent network so-called Rete Dinamica Nazionale (RDN). All…
GPS/INS Systems for compilation of digital large-scale orthophotos
2004
The paper describes the first results of a study, supported by an Italian research project “Integrated Inertial Positioning Systems in Aerial Photogrammetry” on the potential use of these techniques for production of digital large scale orthophotos. The study has been done with aerial photographs collected from two different flights executed in Sicily: the former, relating to the city of Palermo, at average scale of 1:9300; the latter, over the city of Catania, at average scale of 1:2000. For both flights the orthorectification was carried out by direct georeferencing methods and by traditional photogrammetric techniques, using ground control points surveyed by means GPS techniques and aeri…