3D roof model generation and analysis supporting solar system positioning

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© 2017, Canadian Institute of Geomatics. All rights reserved. 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.

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