淤地坝淤积面有一定的纵比降，尾部存在显著的“翘尾巴”现象。
The depositing surface of soil-retaining DAMS has certain vertical gradient, the tail exists obvious phenomenon of "raising tails".
扫描仪误差包括像素间距误差、像素间距横纵比误差及扫描起点误差等。
Scanner errors include pixel interval error, horizontal-to-vertical proportion error and starting position error.
并且由于海平面高度相对稳定在较高位置，河流纵比降较小，流速也较小。
The sea level stops in a high position for a long time, so both drop of water and current velocity are small.
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