What is the science and art of representation of water features on maps?

• A. Bathymetry
• B. Hydrography
• C. Photogrammetry
• D. Hypsography

Answer: (B)

Representing water features on maps is hydrography. This field covers the science and craft of mapping water bodies—coastlines, rivers, lakes—and the depth information that helps convey how those features relate to navigation and planning. Bathymetry is the measurement of how deep the water is beneath the surface, which is part of the data used in hydrography but not the entire practice of depicting water features. Photogrammetry involves deriving measurements from photographs and can support mapping in general, but it isn’t specifically about portraying water bodies. Hypsography deals with elevations and land relief rather than water surfaces. So hydrography best fits the description.