Search results for " Topografia"
showing 10 items of 398 documents
Analysis of technical criticalities for GIS modelling an Urban noise map
2017
This paper analyzes criticalities and strengthens of a procedure used to model the acoustic map of the vehicular traffic of an urban agglomeration. The research is based on a pilot project for the acoustic mapping of a portion of the city of Palermo (Italy). Simulations indicate that the acoustic climate was in line with expectations and with typical of large Italian cities. The most remarkable result was obtained by an increase in the number of reflections (from two to five), while the influence of the height of the building (from 9 to 18 meters) was negligible – on the order of a few points per thousand. Regarding the analysis conducted with the ‘Gden Method’, acoustic values do not diver…
Utilizzo di strumenti free e open source per la fruizione di modelli 3D di siti archeologici basati sul formato PDF
2013
NRTK, PPP or Static, That Is the Question. Testing Different Positioning Solutions for GNSS Survey
2021
Worldwide, the determination of the coordinates from a Global Navigation Satellite System (GNSS) survey (in Network Real Time Kinematic, Precise Point Positioning, or static mode) has been analysed in several scientific and technical applications. Many of those have been carried out to compare Precise Point Positioning (PPP), Network Real Time Kinematic (NRTK), and static modes’ solutions, usually, using the latter as the true or the most plausible solution. This approach is not always possible as the static mode solution depends on several parameters (baseline length, acquisition time, ionospheric, and tropospheric models, etc.) that must be considered to evaluate the accuracy of the metho…
Rilievo di un parco urbano con integrazione delle tecniche GNSS, NRTK, Laser Scanner e MMS
2013
Questo articolo riassume l'esperienza dei ricercatori del Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali (DICAM) dell'Università di Palermo nell'ambito del rilievo di un parco urbano e la sperimentazione di strumenti, tecniche e metodi innovativi. Da piu di vent'anni il Parco d'Orleans, adiacente il campus Universitario di Palermo, rappresenta un laboratorio all'interno del quale effettuare sperimentazioni di alto livello scientifico. Recentemente, una parte di questo parco è stato intitolato alla memoria di Ninni Cassarà, vice questore della Polizia di Stato e collaboratore di Giovanni Falcone. Esso si estende lungo la parte della campagna palermitana che va dal…
ORIGIN AND DEVELOPMENT OF PASTORALISM IN THE MEDITERRANEAN AREA: THE CASE OF VALLONE INFERNO, SCILLATO (PALERMO), SICILY
2014
Un’esperienza di rilevamento architettonico con tecniche integrate
2004
Lo studio esposto riguarda la sperimentazione sulle tecniche per il rilevamento e la rappresentazione di manufatti architettonici caratterizzati dalla presenza di una ricca decorazione scultorea. In particolare, è stata condotta una applicazione sulla parete di ingresso dell’Oratorio del SS. Rosario presso la chiesa di Santa Cita, nel centro storico di Palermo. Nel corso dello studio sono stati messi a confronto ed integrati i dati provenienti dal rilevamento diretto, topografico, fotogrammetrico, e da acquisizioni eseguite con laser a scansione. This paper is addressed to test suitable techniques for surveying and restitution of architectural surfaces decorated with free-form masses (i.e. …
3D mosaics survey: analysis of photogrammetric/computer vision approach in a metrological context
2016
The goal of the paper is evaluate photogrammetric/computer vision approach in a metrological context for 3D mosaics survey. The aim of the mosaics survey is the production of a full-scale representation (scale 1:1) useful for the documentation and for the restoration processes. In order to evaluate the optimal photogrammetric/computer vision workflow in this work three different surveys have been done for three mosaics with different size and location. Two of these are stored at Regional Archaeological Museum “Antonino Salinas” in Palermo (Italy) and the other one is stored at Regional Archaeological Museum “Baglio Anselmi” in Marsala (Italy). The research has allowed to show the potentiali…
Post-processing of Pixel and Object-Based Land Cover Classifications of Very High Spatial Resolution Images
2020
The state of the art is plenty of classification methods. Pixel-based methods include the most traditional ones. Although these achieved high accuracy when classifying remote sensing images, some limits emerged with the advent of very high-resolution images that enhanced the spectral heterogeneity within a class. Therefore, in the last decade, new classification methods capable of overcoming these limits have undergone considerable development. Within this research, we compared the performances of an Object-based and a Pixel-Based classification method, the Random Forests (RF) and the Object-Based Image Analysis (OBIA), respectively. Their ability to quantify the extension and the perimeter…
Protocols for UAS-based observation
2023
In Chapter 1 the terms and the characteristics of an unmanned spatial data collection system were defined along with the fields of application, advantages, and disadvantages of different solutions and sensors. This chapter will present an overview of existing protocols and broad guidelines on environmental unmanned aerial system (UAS)-based monitoring, including study design with the general and possible use of the platform and sensor/camera settings, comprising quality assurance (QA) with all necessary steps (i.e., georeferencing, radiometric calibration for optical and thermal sensors, programming the flight mission, and data processing) to fulfill a complete survey mission for a given en…
RFI: a case study of the University of Palermo
2010
The work shows the results of testing conducted from last years with the GNNS CORS of University of Palermo, in term of radio frequency interference, by a team composed of researchers of Dipartimento di Rappresentazione (DIRAP), Faculty of Engineering of Palermo and to the Laboratory of Physics of the Agenzia Regionale per la Protezione dell’Ambiente (ARPA) of the Sicilian Region. The CORS is first installed inside a scientific network with 9 permanent station located in western Sicily with distance between 22 and 80 kilometres and carry out for real time positioning experience. The main goal of the work is to verify the radio frequency interference which has been subjected CORS in last yea…