Global Mapper v26.0

how to create monotonic hydro-flattenning

Hi all,

I was asked  to create    a hydro flattening DEM with monotonic   characteristic, with decreasing value for every 10 cm in elevation.  Does anyone know how to do it?   i found the picture below  on  the internet but couldn't  find how and what software exactly they are using. 

Thank you.


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