Coordinating the Points in 3D in and around the Test Tank

摘要

Underwater laser measurements in a test-tank at Harbor Branch Oceanographic Institute at Florida Atlantic University are verified by terrestrial positioning techniques. In order to do that 2D traversing measurements and 1D differential leveling measurements are taken. After computing 3D coordinates of the control points, the coordinates of detailed points inside the lab are calculated. Deflections of tank walls are determined by utilizing the reflectorless mode of the robotic total station instrument. Around the tank the highest expansions experienced were in the order of a centimeter or two. Next, the coordinates of the viewports are determined and they are corroborated by the measurements taken by scuba divers. Only 0.08 meters difference is found between coordinate computations and scuba divers measurements. Finally it is tested whether the coordinates could be transferred into water.