图像的上部，密西西比三角洲位于正中。浮油似银色的漩涡流向右边。
In the top image, the Mississippi Delta is at image centre, and the oil slick is a silvery swirl to the right.
圆圈中的三角形表示液流方向，如果三角形尖端向外，说明液流向外输出，表示这是油泵。
In circle triangle expression liquid flow direction, if the triangle acme outward, showed the liquid flow outputs outward, expressed this is an oil pump.
基于不规则三角网DEM，提出一种新的单流向地形特征自动提取算法。
Based on TINs DEM, a new single-flow direction algorithm for topographic patterns extraction is proposed.
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