等深线海底地形图
contoured bathymetric chart
分层设色海底地形图
layered bathymetric chart
海底地形测量
bathymetric surveying
submarine topography survey
bottom topographic survey
hydrographic surveying
bathymetric survey
Bathymetry
海底地形测量系统
bottom topography survey system
海底地形特征
submarine topographic characteristics
topographical characteristics
水底地形测量
measurement of submarine topographic
不同地形部位
different topographic position