Parameter optimization for creating reliable photogrammetric models in emergency scenarios
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ORIGINAL PAPER
Parameter optimization for creating reliable photogrammetric models in emergency scenarios S. Gagliolo 1
&
R. Fagandini 2 & D. Passoni 1 & B. Federici 1 & I. Ferrando 1 & D. Pagliari 2 & L. Pinto 2 & D. Sguerso 1
Received: 15 January 2018 / Accepted: 11 May 2018 # Società Italiana di Fotogrammetria e Topografia (SIFET) 2018
Abstract An optimized planning and realization of the survey, coupled with well thought-out processing, allows obtaining good quality results, while guaranteeing a reasonable use of resources and time. It represents a benefit for both operators and end-users. The former can save time and acquire smaller datasets to process, while the latter can invest their resources better. These goals are even more important in case of an emergency, because the circumstances can quickly change, causing risk to both people and goods. The paper examines the possibility of using unmanned aerial systems (UAS) photogrammetry for 3D modeling in such scenario, focusing on finding a compromise between the final accuracy and the requested processing time. An experimental test has been conducted over the Castle of Casalbagliano, a damaged structure located near Alessandria (Piedmont, Italy), simulating a post-emergency scenario. Several processing strategies have been tested to define a workflow useful in this kind of situations. The quality of the different processing has been evaluated in terms of both residuals of the bundle block adjustment and quality of the generated dense point cloud, compared with a reference terrestrial laser scanner acquisition. Finally, the possibility of publishing the obtained 3D models on the web has been exploited too. Keywords UAS . Photogrammetry . Emergency . Survey strategy . Cultural heritage . Safety . Optimization
Introduction In case of a catastrophic event damaging an area, several aspects must be taken into account. The first and main goal is to save human lives, by taking urgent actions to help people move away from danger. The second important task is the preservation of goods. The present research has been developed with a focus on the latter aspect, paying particular attention to the preservation of cultural and artistic heritage, especially buildings.
The interest of researchers on cultural heritage has widespread in the last decades, focusing on different aspects: from pure historical image documentation (Yastikli 2007; Yilmaz et al. 2007), mapping (Remondino 2011), and digital reconstruction of destroyed objects (Grün et al. 2004) to the creation of web catalogs and virtual museum tours (Wojciechowski et al. 2004; Bruno et al. 2010). 3D models of cultural heritage could help in securing, planning, and performing the restoration of damaged buildings. They are commonly produced by terrestrial laser scanner
* S. Gagliolo [email protected]
D. Pagliari [email protected] L. Pinto [email protected]
R. Fagandini [email protected]
D. Sguerso [email protected]
D. Passoni [email protected] B. Federici bian
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