RT Journal Article T1 A PBeL for training non-experts in mobile-based photogrammetry and accurate 3-D recording of small-size/non-complex objects A1 Ortiz Sanz, Juan A1 Gil Docampo, María de la Luz A1 Rego Sanmartín, María Teresa A1 Arza García, Marcos A1 Tucci, G. K1 Photogrammetry K1 Precision K1 Measurements K1 Accuracy K1 Smartphone K1 E-learning AB The high level of automation, user-friendliness and cost-effectiveness of photogrammetry have contributed significantly to its popularisation among amateur users in recent years. Paradoxically, this situation poses challenges when relying on the accuracy of the derived 3-D products requiring control procedures to be implemented. In this context, we present a case study of the D3Mobile project: a fully online competition for participants worldwide funded by the International Society of Photogrammetry and Remote Sensing (ISPRS). The aim is for participants to obtain reality-based 3-D models using their own mobile phones and to critically examine the metric accuracy that hides behind the beguiling realism of photogrammetry. The relative precision of the former participants’ models reached values around 1:2,000, proportionally to the object size. These results provide an idea of the current level of development of photogrammetry and the potential it offers for any kind of user after proper capacity building and training PB Elsevier YR 2021 FD 2021 LK http://hdl.handle.net/10347/27523 UL http://hdl.handle.net/10347/27523 LA eng NO Measurement 178 (2021) 109338 DS Minerva RD 24 abr 2026