Rebuilding multiple mesh surfaces into one mesh surface

Hello everyone,
In order to build the topography of a huge area in rhino I started downloading small chunks of the area one by one and I came up with a kind of a pixelated topography with lots of overlaps amongst them. My question is what is the best practicce to make a unified mesh surface that is the result of sampleing all the pre-existing mesh surfaces

topo temp.3dm (475.4 KB)

I think the quickest way to a single object, mesh or surface, would be to draw a planar surface or mesh below the mesh segments and project the control points upwards.

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thank you so much, do i have to use rhino 8 for this? when I run the project command it does not let me to select the control points of the surface I rebuilt.

What if you select the control points before running the command?

You could also use Drape Surface over the entire shape. It might be quicker, depending on the level of accuracy you need.

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