about vint

[dongdong]

hello everybody:
   i have some troubles with function 'vint'. Can you
help me? Thank you in advance!
  1. which is the right function express,
vint(expr,psexpr,top) or vint(psexpr,expr,top) ? In
the web,it says vint(psexpr,expr,top) but in the GrADS
document(v1.5.1.12),it is vint(expr,psexpr,top)
  2. psexpr is surface pressure or sea surface
pressure?
  if it's surface pressure, do i have to change sea
surface pressure to surface pressure (based on surface
height)? is there another way ? (because i only have
sea surface level pressure at hand,and don't have
surface height datasets)

  Thank you very much,and Best Regards!!!







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