For geophysics it would be very useful to have the IDV recognize a 1D vertical profile representing a standard earth
model varying with depth, seismic velocities say, and use it to compute offsets from 3D grids. To do this now we have
to make a 3D grid that has the same values at all lat,long points and differs only in depth. (That is a workaround for
Rich Signell's problem too). I suppose a standard atmosphere might be useful too.
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