When it comes to flood simulation, knowing the direction of flow is very important. However, HEC-RAS’s RasMapper only give the absolute value of velocity. It can only show the arrow on its board (as shown in Figure) but the arrow can not be saved to a file(e.g., tif). How can I extract the flow direction? For example, saving the velocity on x-direction and y-direction respectively.
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extract the flow direction
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