Back in 2016 I was inspired by Pokemon GO to go for geo-location as a means of mapping the game world onto the real world. This idea was not new to me as it was part of my master thesis work back in 2012.
At the time I instead wanted to go for physical RFID tags and AR markers, thinking GPS to be too rough and inaccurate at the time. Then I reconsidered and found the project MapzenGo by brnkhy. This was really fun to play around in, but the project was halted due to the developer being hired by a company providing this type of service commercially, MapBox.
Recently I have played around a bit with the free license of this, more polished tool. We’ll see when I find the time to really pick up this project…