Unable to merge Grid and Tin Surfaces

[Anonymous]

I have two surfaces I am trying to merge:

-a large Grid surface created from a DEM (A clipped raster created in GIS from USGS ArcGrid data), and

-a smaller TIN surface from flown LIDAR (that I would like to paste over the DEM)

It appears that the two types of surface data (TIN and GRID) are incompatible. Why is this? My impression is that a grid surface is simply a more organized TIN surface, and I have assumed (incorrectly, perhaps) that a surface is a surface and they should speak the same language.

In short, I am having difficulty figuring out how best to bring these two types of surfaces together. Any help is appreciated. Thanks!

[MMcCall402]

Perhaps extract the border of the tin and use it as an internal boundary for the grid surface.

Or, make a new empty surface and paste in the grid surface and then the tin surface.

[rkmcswain]

Have you seen this?