The survey system can make measurement of the depth of the mud scum and can automatically plot a navigable water depth chart with the acquired data of water depth.

该系统可以进行浮泥层水深测量并将水深数据经整理后自动绘制成适航水深图。

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Meanwhile, a national survey is helping to plot dragonflies and damselflies on the map.

BBC: Rare dragonfly visitor at reserve