Turning a height map like you have directly into a pretty one in Wilbur is unlikely to be particularly successful. The images below show the raw height field in Wilbur's 3D preview and what happens with the basic noise/basin fill/incise flow/precipiton erosion filters. The raw height map has some feature that don't process well, including high first contour and flat-topped mountain ranges. The process described above gives much better results with more complex contour boundaries.

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