Very close nadiral images: a proposal for quick digging survey

Tipo di pubblicazione: Articolo su rivista
Tipologia MIUR: Contributo su Rivista > Articolo in rivista
Titolo: Very close nadiral images: a proposal for quick digging survey
Autori: Rinaudo F.; Chiabrando F.;Spano' A.;Costamagna E.
Autori di ateneo:
Tipo di referee: Tipo non specificato
Editore: ISPRS Council
Volume: XXXVIII/5
Intervallo pagine: pp. 155-160
Numero di pagine: 6
ISSN: 1682-1750
Abstract: The main goal of our activity has been the testing of a system for quick and non invasive images acquisition and their suitable processings aimed to obtain 2Do 3D models for archaeological diggings documentation. This purpose has implied the analysis and the selection of a simple and efficient data processing system for the generation of metric products such as digital elevation models and orthophotos, featured by an high level of detail regarding the excavated areas. The acquiring system has to be quick to meet the excavation requirements and the processing system has to be featured by good quality in terms of accuracy and information richness to ensure suitable final products. The objective of acquiring very close nadiral images is made up by a mobile framework easily assembled directly on site. The production of orthophotos was carried out starting from the generation and comparison of three different DEMs, originated from different source data and defined by dissimilar accuracy; the evaluation of DEMs is aimed to single out which kind of them, sufficiently meet archaeological excavation requirements, or better, which level of automation fulfil the overall quality reached by more time-spending and traditional methods. The first DEM (a) has been obtained by a traditional method, i.e. a non-gridded DTM, acquired by topographical method directly on site (by a total station), which has been integrated by breaklines and scattered points measured by stereo-plotting. The second DEM (b) has been derived from a DTM automatically obtained by a robotic total station scanning, whereas the last, DEM (c), was produced by image matching solely. The evaluation of the accuracy of the three different DEMs and related ortho projections let us testing some different kinds of elevation models generation and their suitability for antropic nature objects: the Inverse Distance Weighting algorithm processed with dense break-lines; mesh generation, based on Delauney triangulation, from dense DTM, and the epipolar geometry solution applied to correct nadiral and well textured images. Two commercial software we used are Z-Map (by italian Menci Software) and Photomodeler Scanner (by canadian Eos Systems). The last goal was to test the results in relation with the archaeological diggings context and documentation purposes
Data: 2010
Status: Pubblicato
Lingua della pubblicazione: Inglese
Parole chiave: close-range survey, dem, ortho-images
Dipartimenti (originale): DINSE - Scienze e Tecniche per i Processi di Insediamento
DITAG - Ingegneria del Territorio, dell'Ambiente e delle Geotecnologie
DICAS - Dipartimento Casa Città
Dipartimenti: DAD - Dipartimento di Architettura e Design
URL correlate:
Area disciplinare: Area 08 - Ingegneria civile e Architettura > TOPOGRAFIA E CARTOGRAFIA
Data di deposito: 06 Lug 2010 15:13
Data ultima modifica (IRIS): 29 Ago 2016 01:59:46
Data inserimento (PORTO): 31 Ago 2016 04:31
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