I have a question about gps vertical accuracy. I am an inspector on major highway projects in California. I work with alot of surveyors as they set grade stakes. Typically the surveyors will use GPS for setting the stakes and hubs in the horizontal position but follow up with a level or total station to set the vertical. They have told me that GPS is not that accurate in the vertical. Is that true, and if so why? Also how precise is the total station in the vertical since it uses trigonometry for angles.
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