Help How to know if a cliff is high enough?

[deathplease]

Does anyone know how to tell if a cliff is high enough to ctb on land without knowing the exact height measurements? I'm having trouble finding the highest point of where I will be jumping. It's an escarpment but it goes on forever. The highest is 100m (330ft) but I may have to jump from lower. I unfortunately can't find a building to get to the top of as a back up plan. Thanks pals!

 

[Walilamdzi]

Doesn't seem to be predictable given plenty of people ctb from golden gate, but there are still survivors.

 

[Can'tStandAnymore]

You can measure the height. Even, you don't have to be on top of the building to measure it.
Can you get a laser meter(?)

 

[drakewantstogo]

"From a height of 30m there is a 90% probability of death. The longer the fall, the higher the probability of death will be. If it is over 100m on land, and 200m on water, the probability is near 100%. The fall from the Golden Gate Bridge, for example, is 74 meters, and 98 percent of jumpers die"

From the wiki