How to iterate the heightmap between Houdini and UE4

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Hi,


I created a terrain through Houdini and imported the hda file into UE4.
It works well but if I want to get roads information which is including height/width from UE4. I have to re-export the heightmap from UE4 into Houdini and re-create a terrain and rematch the height.

So how to iterate the heightmap between Houdini and UE4 if I want to get some roads info or any changes in terrain's height?

Thanks in advance.
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