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Ground Control Points (GCP) and Quality Control Points (QCP) are essential in photogrammetry to give metric value to our model, and this is true for a terrestrial camera as well as for an RTK or non-RTK drone. In this video I show how GCP and QCP intervene in 3D reconstructions, how to position them and how many to position. I refer you to the article I wrote on my website for further information. https://www.professione3d.it/2020/02/... Do not hesitate to contact me for any need. ing. Giancarlo Ciaccia [email protected] www.professione3d.it Professione3d Facebook: / ing.giancarlo.ciaccia Professione3D (@professione3d) TikTok: / professione3d Giancarlo Ciaccia LinkedIn: / giancarlo-ciaccia-612b62189 Telegram: Contact @professione3d: https://t.me/professione3d Credits: Video by Kindel Media from Pexels: https://www.pexels.com/it-it/video/te... Video by Jean Pablo Silva from Pexels: https://www.pexels.com/it-it/video/ma... Video by Mikael Blomkvist from Pexels: https://www.pexels.com/it-it/video/pe... Video by Tima Miroshnichenko from Pexels: https://www.pexels.com/it-it/video/uo...