Stephen V. Estopinal, PLS, PE, is the Surveying Division Manager at SJB Group, a land surveying, civil engineering, real estate services, and program management service company in Baton Rouge, Louisiana. He has been in the practice of land surveying for more than forty years. Author of A Guide to Understanding Land Surveys, Third Edition (Wiley) and columnist for Professional Surveyor Magazine, he is a frequent lecturer on surveying matters and regularly serves as an expert witness. Wendy Lathrop PLS, CFM, President of Cadastral Consulting, LLC, is a professional land surveyor, planner, and Certified Floodplain Manager, involved since 1974 in projects ranging from construction to boundary to environmental land use disputes. She has been presenting seminars for her colleagues across the country since 1986 and is a contributing editor for The American Surveyor magazine. She is a past president of the National Society of Professional Surveyors.