I have two 3D Raster surfaces which are flood height surfaces for two different flood heights. They each have XYZ coordinates. I now wish to generate a third surface BETWEEN these two surfaces at particular heights related to the Reference Flood Gauge. Can anyone advise what would be a suitable method?
Surface(top) is the flood surface at a level (say) 10.2m on the gauge and surface(bottom) is at (say) 7.68m. The surfaces extend many kilometres upstream and downstream and are (certainly) not parallel to each other (i.e. the height difference at each Raster point is (mostly) different from the next Raster point).
And I want to end up with a “smooth” looking interpolated surface (i.e. there should be no unusual “peaks” relative to the other surrounding points.
I also have a third Raster layer being the DEM for the ground surface.