A hydrographic survey of lakes and rivers may include determination of which items?

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Hydrographic surveys map water bodies and the immediate aquatic environment, focusing on what lies at the edge of and beneath the water. Including shorelines defines the land–water boundary, which is essential for mapping the limits of the water body. Recording soundings provides depth information, a core part of charting the underwater profile and navigation channels. Describing bottom characteristics reveals the type of seabed or riverbed (mud, sand, rock), which affects vessel performance and dredging decisions. Locating buoys marks navigational aids and hazards, guiding safe passage through the waterway.

Other items listed are not typical hydrographic targets: parcel boundaries are land ownership measurements, parking lot dimensions pertain to site development on land, and building footprints relate to architectural/site plans. These are land surveying tasks and not part of hydrographic surveying for lakes and rivers.