Augmented reality and location determination methods and apparatus are disclosed according to some aspects of the description. In one aspect, a location determination method includes accessing first location information regarding a location of a user interaction device in a physical world, wherein the user interaction device is configured to generate an augmented reality representation with respect to the physical world, using the first location information, identifying a marker which is proximately located with respect to the location of the user interaction device, accessing an image generated by the user interaction device which includes the marker, and processing the image to determine second location information regarding the location of the user interaction device, and wherein the second location information has increased accuracy with respect to the location of the user interaction device in the physical world compared with the first location information.