Search results for "cartografia"
showing 10 items of 325 documents
On the Accuracy of Cadastral Marks: Statistical Analyses to Assess the Congruence among GNSS-Based Positioning and Official Maps
2022
Cadastral marks constitute a dense source of information for topographical surveys required to update cadastral maps. Historically, in Italy, cadastral marks have been the cartographic network for the implementation of mapping updates. Different sources of cadastral marks can be used by cadastral surveyors. In recent years, the cadastre is moving toward a digital world, and with the advancement of surveying technology, GNSS CORS technology has emerged in the positioning of cadastral marks. An analysis of congruence among cadastral marks using GNSS CORS and official maps is missing. Thus, this work aims to analyze the positional accuracy of some cadastral marks, located in Palermo, Italy, wi…
The effects of cors network geometry and differential nrtk corrections on gnss solutions
2021
The widespread availability of Continuosly Operating Reference Station (CORS) all over the world, allows to improve more scientific and technical studies on the use of satellite positioning techniques. The aim of this paper is to understand the effects of a GNSS CORS network geometry and differential corrections on the solutions. The analysis is carried out using ten different network configurations, with different inter-distances between the stations within GNSMART Geo++ software. The coordinates of one control point placed on the top of the Department of Engineering (University of Palermo, Italy) have been used to perform several static positioning mode test within fourthy hours. Differen…
OPEN GEONET: WebGIS Open Source of a GNSS Permanent Network
2010
In Sicily, from 2005 to 2007, a research group at Dipartimento di Rappresentazione (DIRAP), University of Palermo, Italy, has realized a Global Navigation Satellite System (GNSS) Network Real Time Kinematic (NRTK), project inside the “National Interest Research Program” PRIN2005 entitled ”Reti di stazioni permanenti per impieghi di controllo ed emergenza” founded by Minister of Instruction, University and Scientific Research (MIUR). With the rapid development of Internet and Web, Web Geographical Information System became an important aspect of GIS study. WebGIS software allow the most efficient and low-cost way in dissemination and sharing of geographic information for public and specific …
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…
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…