32 research outputs found
Un confronto operativo fra restituzione analitica e digitale per la fotogrammetria architettonica
No full textCONFRONTO OPERATIVO TRA RESTITUZIONE ANALITICA E DIGITALE PER LA FOTOGRAMMETRIA ARCHITETTONICA
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Experiences in Photogrammetric and Laser Scanner surveing of Architectural Heritage
No full textThe integration of different methodologies and simplification of procuderes is surely one of the most important current themes in survey techniques for reaserching cultural heritage, especially for architectural heritage. The tradiniotal methods for the metric survey of an architectural building (including micro geodesy and the stereophotogrammetrics survey) are currently being consolidated
Le ortofoto digitali ad alta risoluzione: nuove frontiere nelle analisi ambientali e territoriali
No full textLa costruzione di una base di conoscenza territoriale a scala regionale, omogenea per contenuti, tolleranze geometriche ed epoca delle acquisizioni appare oggi possibile solo con l’uso dei sensori digitali ad alta risoluzione su piattaforma aerea o satellitare.
Le tecniche di produzione di ortofoto digitali, sia a colori che in bianco-nero, hanno conosciuto una buona diffusione ed una media rapidità esecutiva essendo basate tipicamente sul processo ibrido analogico-digitale che a partire da riprese aeree su pellicola conduce alla ortoproiezione digitale attraverso l’acquisizione digitale dei fotogrammi.
La Regione Puglia, prima in Italia, ha acquisito la copertura ortofotografica a scala regionale eseguita con processo totalmente digitale e completata in pochi mesi. Lo strato informativo disponibile, strutturato in sezioni di ortofoto digitali a colori alla scala nominale 1:10.000, possiede una risoluzione a terra molto elevata (0,5 x 0,5 m) maggiore di tutti i prodotti ortoproiettati fino ad oggi disponibili in pari scala.
Vengono esaminate le caratteristiche produttive dell’intero processo digitale, le prestazioni geometriche e radiometriche delle immagini e le problematiche connesse all’uso ed all’archiviazione di basi di dati raster di grandi dimensioni ed al loro impiego cartografico in ambiente GIS.The building of a base of land knowledge at regional scale, homogeneous in its contents, in its geometric resolution and time of acquisition, appears possible nowadays only with the use of high resolution airborne or satellite digital sensor.
The production of digital orthophotos, both in colour and in black & white, have known a good diffusion and a medium executive speed being typically based on the hybrid analogical-digital process which starting from aerial shooting on film arrives at the digital orthoprojection through the acquisition of the single photo frames.
The Puglia District (in south of Italy), first in Italy, acquired the global covering executed with a totally digital process and completed in a few months. The available layer of information, has a very high ground resolution (0,5 x 0,5 m) higher than all the satellite images available today on the same scale.
The entire digital process are examinated, in particular the geometrical and radiometric performance of the images and the problems related to the use of raster data base of very high size and their integration in GIS procedures
Confronto fra algoritmi di identificazione di punti omologhi in immagini digitali multiple
No full textUsing Photogrammetry and Laser Scanning in Surveyng Monumental Heritage: le Grotte di Castellana
No full textUsing the most recent survey techniques of an Architectural or Monumental Heritage, this study investigates problems on three-dimensional modelling in order to develop and to promote vision metrology.
Treatment of different survey techniques aims at defining, in a systematic way, their own distinct procedures and, meanwhile, investigating numerous uses for various fields of application.
It is plain that the achievable accuracy, with specific characteristics of every single technique, determines a considerable variety of attainable products that vary from navigable three-dimensional models for tourist and popular aims to 3D Informative System for Architectural Heritage conservation and restoration.
As a first approximation, it is intuitively remarked that Laser Scanning and Metric Cameras Photogrammetric survey products will be addressed to precious Monumental Heritage, in which accurate control operations of spatial information, with perfect metric object knowledge for conservation and restoration, it is necessary. All this is true both for Architectonic manufactures and other artistic and historical works that would be studied and preserved.
Recent instruments with minor accuracy achievable (digital cameras, etc.) can certainly be utilized for three-dimensional models, also with 3D Modelling and Virtual Reality techniques, in order to permit public knowledge and fruition of monuments. In this case we want investigate in such situations, and with what accuracy they already are a valid alternative in the field of Monument metric description.
In this study we analyse a monumental site, “Le Grotte di Castellana” situated in Castellana (Bari), in the Apulia region.
It has been realized a survey campaign with Laser Scan Mensi GS 100, Photogrammetric instrumentation: Nikon D100 reflex digital camera with 6 Mpixel CCD calibrated in our laboratory.
We have investigate different methods of camera calibration with commercial softwares (StereoView, Photomodeler, etc) and we have product orthophotos using Digital Surface by Photogrammetric correlation.
The survey process had permitted three-dimensional coordinates identification of scattered points. These describe an opportunely treated geometry of surveyed object and consent three-dimensional model realization of its exterior surface.
Such spatial informative system model can aid image analysis operations, supporting future Restoration and Conservation projecting decisions
