Indiana Society of Professional Land Surveyors Indiana Society of Professional Land Surveyors The Indiana Society of Professional Land Surveyors connects surveyors across Indiana and provides education for the industry. Online CEU Hours Available Visit the ISPLS Video Library for Continuing Education Opportunities Indiana Society of Professional Land Surveyors Established in 1954 ISPLS is a notforprofit organization that seeks the growth and development of the Surveying Profession. Our primary mission is to provide our membership a professional identity professional guidelines and direction educational services and to promote the interests of the profession. The philosophy of ISPLS is to encourage all who are in the surveying profession to value professional ethics in thought and deed to maintain competency in performance of duties to ensure trustworthiness to provide quality in work and to constantly protect the public interest.