Abstract
This study employs Structure from Motion (SfM) to survey a historic building façade. Professional photogrammetric software (Agisoft PhotoScan and Pix4D) is compared with low-cost photogrammetric software (Autodesk Remake) to analyse the accuracy of these solutions and compare their possibilities and ease of use through a complete methodological process. Here, 3D modelling was tested on the façade of San Martín Pinario. The performance, operational usefulness, visual and geometric quality and accuracy are analysed. The results show that cloud computing software offers 3D models with visual quality and an accuracy similar to those obtained with desktop software, with a minimum error in the tree cases of 0.5 cm and maximum in PhotoScan of 3.5 cm and with a similar mean error in all cases around 1.6 cm. Cost savings and ease of use make photogrammetric cloud computing a great measurement tool for professionals who are not specialists in photogrammetry.
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