海底地形测量（bottom topographic survey）是按一定程序和方法，将海水覆盖下的海底地形及其变化记录在载体上的测绘工作。此系陆地地形测量在海洋区域的延伸，内容包括：水深测量、海上定位测量、海洋底质探测和海底地形图绘制等。
它是一种高测量效率、高测量精度、高分辨率的海底地形测量设备，特别适合大面积的扫海测量作业。
It fits especially for mapping of large area of seafloor because of its high efficiency, high accuracy and fine terrain resolution.
多波束测深仪是一种高效率、高精度、高分辨率的海底地形测量设备，特别适合大面积的扫海测量作业。
Multi-beam swath bathymeter is a seafloor mapping equipment with high efficiency, high accuracy and excellent resolution, especially fitted for wide sweep mapping.
水深(或海底地形)的数据往往是在船只上使用声纳测量海底采集的。
Bathymetric (or sea floor terrain) data is often collected from boats using sonar to take measurements of the sea floor. The lines reflect the path of the boat as it gathers the data.
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