Adjusting high res DEM to match regional DEM?

tim53tim53 Global Mapper UserPosts: 68Trusted User
I have Mars rover orthomosaics and DEMs that I want to merge with orbiter-derived orthomosaics and DEMs.  Is there a way to define a terrain grid with the same boundary as the [irregular] rover-based DEM so that I can subtract the difference between the rover and orbiter based dems and "lower" the rover based DEMs so that it is at the exact elevation of the orbiter DEM at the edges?
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