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3D roof model generation and analysis supporting solar system positioning

Publication: GEOMATICA
19 December 2017

Abstract

Given the growing needs of renewable energy in urban areas, identifying suitable installation locations for solar systems is increasingly important. Existing energetic cadastres often have a limited level of detail in the analysed geometry, which needs to be rapidly updated following any changes to the buildings. The required 3D data can be generated by photogrammetry techniques and Structure-from-Motion (SfM) software. In this paper, the method was tested employing Digital Mapping Camera images (virtual images), on a case study in northwest Italy. The results are analysed for assessing the reliability of the DSM produced by SfM methods, to be employed in solar radiation analyses. The problem of this kind of automatic 3D modelling can be the excessive detail sometimes required in reconstructing the geometry of the roofs and the possible noise. The results are managed and analysed through Geographical Information System (GIS) tools. For the whole workflow, proprietary and free open source software (OSS) are used. The problems and limitations are investigated in order to evaluate and confirm the reliability and cost effectiveness of the described methods.

Résumé

En raison des besoins croissants d’énergie renouvelable dans les secteurs urbains, le recensement d’endroits convenables pour installer des systèmes solaires est de plus en plus important. Les cadastres énergétiques ont souvent un niveau de détail limité dans la géométrie analysée qui doit être rapidement mise à jour à la suite de tout changement apporté aux édifices. Les données tridimensionnelles requises peuvent être générées par les techniques de photogrammétrie et le logiciel Structure-from-Motion (SfM). Dans le présent article, la méthode a été vérifiée en utilisant les images d’une caméra de cartographie numérique (images virtuelles) lors d’une étude de cas dans le nord-ouest de l’Italie. Les résultats sont analysés pour évaluer la fiabilité du modèle numérique de surface (MNS) produit par les méthodes SfM et devant être utilisé dans les analyses du rayonnement solaire. Le problème dans ce genre de modélisation tridimensionnelle automatique peut être la très grande quantité de détails parfois requis dans la reconstruction de la géométrie des toits et le bruit possible. Les résultats sont gérés et analysés au moyen d’outils SIG (système d’information géographique). Pour l’ensemble du flux de production, on utilise des logiciels propriétaires et des logiciels libres et ouverts (LLO). Les problèmes et les limites font l’objet d’une étude afin d’évaluer et de confirmer la fiabilité et le rapport coût-efficacité des méthodes décrites.

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Information & Authors

Information

Published In

cover image GEOMATICA
GEOMATICA
Volume 71Number 3September 2017
Pages: 137 - 153

History

Version of record online: 19 December 2017

Authors

Affiliations

Filiberto Chiabrando
Politecnico di Torino - DAD, Torino
Chiara Danna
Politecnico di Torino - DIATI, Torino
Andrea Lingua
Politecnico di Torino - DIATI, Torino
Francesca Noardo
Politecnico di Torino - DIATI, Torino
Anna Osello
Politecnico di Torino - DISEG, Torino

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