Algothms used in WebODM for orthomosaic creation

I am wondering which algorithms for orthomosaicing are used in webODM. From which open libraries the algorithms are imported for easy use? The thing I am wondering is: how does GPS information helps with mosaicing. Is this data there just to estimate rough image position - so the estimation of which image is successive to another is possible? I am guessing that alignment is executed with algorithm that is based only on descriptor search (alghoritm such as SIFT). With that I mean that the information of GPS is actually not that necessary. Please correct me that I will better understand the working principle of alignment.

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The OpenDroneMap: The Missing Guide gets into this a good amount.

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Also, bear in mind that this particular aspect of OpenDroneMap is evolving quite literally as we speak:

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thank you for your answer. I will thing about buying the book. Also this will reward good work of creators.

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I really like it. I just bought it myself, this week.

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