best way to achieve precise persistent AR

Unity Engine
1

What is currently the best way to achieve precise and persistent AR?
I want to precisely place an AR objects in a very specific outdoor environment that I can map in advance.
I have been looking at Placenote and ARKit’s ARWorldMap as a way to map the environment, embed it in my app and allow a user to “snap” to this environment to acquire the correct position.
This seems more precise than GPS based approaches including the ‘AR + GPS Location package’.

  • Is this correct? Is mapping a place and then allowing the user to snap to this existing map the best approach for precise placement of AR markers in a defined space (such as a park)

  • Is there a maximum / preferred dimension of a map? Can you map a 100m x 100m park in a way that a user can snap to it?

  • Is there a difference between using Placenote or ARKit’s ARWorldmap, or in the first based on the latter?

  • Are there better alternatives / frameworks?

2

arworldmap is the only solution that exists right now, unless you roll your own.

3

There is a plutora of startups that serve a precise persited AR cloud.
Here’s just a few not mentioned allready in this thread:

They all seem to offer and promise more or less the same.

4

@ Thank you for the list. It is very helpful with finding better alternatives.