A guy came up to my house a little while ago, he said he was here to measure the power poles on my property. Being curious I watched him measure one. He tied a pole about 5' long to the pole and got an electronic instrument on a tripod and went 20 0r 30 feet from the pole and did something with the instrument and then loaded up his stuff and went on his way. I suppose this is the modern way to measure the height of something but I wondered if he knew how to do it without that device. I would have done it the old fashioned way, take a pole of a known length, stand it up next to the power pole, measure it's shadow then measure the shadow of the power pole and do a little math. I'm sure it would be cheaper.