Same as in land surveying or any other discipline that requires state licensure. Some surveyors do have civil engineering or geomatics/geodesy degrees, but you certainly don't have to obtain one to practice surveying (state law varies). What's important is that you have field experience under the direct supervision of a PLS and can pass a very rigorous licensure exam that includes demonstrating a deep knowledge of property/boundary law, trigonometry, and calculus. There's no question about your competence if you can pass a PLS exam.