We require that spot elevations be noted on staking such as this as it helps us verify that the stakes are in the correct locations. For example, if we arrive at the stake for the 12th tee, we can match the noted spot elevation with what we see on the topographical map. If there is a great discrepancy we will ask the surveyor to come back out and verify the location. Occasionally there will be a deviation of a few feet due to vegetation, erosion or plain old bad mapping. But, for the most part, I am always impressed with the accuracy of today's surveying.