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Re: [ferret_users] height to pressure inversion

Hi Halldor,
The ZAXREPLACE functions will do this. The function takes a variable on one Z axis, a function relating the new Z axis to the old one; and it makes the conversion. The documentation contains examples using sigma coordinates, but the process can be used for any two monotonic Z axes.  See ZAXREPLACE in the Users Guide documentation.


halldor bjornsson wrote:
Dear Ferreters,

I am working with NCEP height data

This data has height in terms of pressure, i.e. Z(p).
I want to invert this into pressure as a function of height, i.e. P(z).

I have been looking at the sigma regridding go files, but these are fine to  change the
vertical coordinate from p to z, but do not invert the variable from Z to P, i.e. do not give me the pressure.

Does anyone know how to do a conversion such as this one?


Halldór Björnsson
Deildarstj. Ranns. & Þróun
Veðursvið Veðurstofu Íslands

Halldór Bjornsson
Weatherservice R & D
Icelandic Met. Office


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