It’s as much about testing/showcasing emerging standards as anything. Per The Verge:
If you’ve got an Android device, just open up the Chrome browser and go to goo.gle/sodar to launch the tool, named SODAR. There’s no app required, though it won’t work on iOS or older Android devices. Your phone will use augmented reality to map the space around you, superimposing a two-meter radius circle on the view from your camera.
Sodar – use WebXR to help visualise social distancing guidelines in your environment. Using Sodar on supported mobile devices, create an augmented reality two meter radius ring around you. #hacktohelp https://t.co/Bu78QrEN9f pic.twitter.com/kufatNFDQk— Experiments with Google (@ExpWithGoogle) May 28, 2020