masking out in gsn_csm_pres_hgt_vector

Hi,
I am using "gsn_csm_pres_hgt_vector" to plot the press vs latitude
cross-section of the Era Interim data.
Since the ERA Interim data are in fixed pressure level, how do I interpolate
them to bring the terrains into the picture? or how could I mask the data
that are below surface in case of mountains when I am plotting?
Looking forward for your kind help.
Thanking you.
Regards,
Prabhakar

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Received on Wed Sep 22 12:24:13 2010