tinfoil hat timmy
Gold Member
- Joined
- Aug 21, 2014
- Messages
- 20,198
this has been done.Take a big lake in winter, when it's frozen. Put up 3 posts. At zero, 1 km, and 2 km. Use Chip's green laser. Shoot from post 1 to post 3 at the same height, say 1m. Measure the height of the laser at the middle post, should be 92cm. If the lake is larger and the ice is rough, scale up for more accuracy.
Don't break through the ice when you put the posts in.... in case of doubt use camera tripods instead.