[gradsusr] Masking out grid boxes for elevation correction

[Roberto Mera]

All,


I'm trying to apply an elevation correction to model data by adjusting the lapse rate based on NARR. Basically, I'm looking to use a rate of 4.5 C/km for mountains, otherwise 6.5. where the adjustment is the rate the times the elevation difference.



The location where I'd like to apply the masks are lon -122.5 -121 lat 43.5 45.2 for the Oregon Cascades and lat 46  49 for Washington Cascades and lon -121 -117.9, lat 35.5 - 40.5 for the Sierra.



I'm placing the two grids on a common 25km grid and taking the difference between elevation.



I appreciate the help.

Robert


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