We're celebrating our ocean throughout the month of June. You can follow along on Twitter, Facebook, and Instagram. Look for #30daysofocean. This week, we're focusing on hydrography. Hydrography is the science that measures and describes the physical features of the navigable portion of the Earth's surface and adjoining coastal areas. Hydrographic surveyors study these bodies of water to see what the "floor" looks like. NOAA conducts hydrographic surveys to measure the depth and bottom configuration of water bodies. This information is vital to navigating the ocean and our nation's waterways.