Right now the watering geo fence area is only marked by the four bordering posts. It'd be better to visualize the fence borders.
https://github.com/hl3hl3/ARCoreMeasure/blob/master/app/src/main/java/com/hl3hl3/arcoremeasure/ArMeasureActivity.java
Could provide an example way, see drawLine
Or we should just simplify it and somehow allow a radius, or don't geofence at all and allow watering of any tree