[gradsusr] wrfout projection in grads

[LI Qi]

Dear grads community,


I don't really understand how the wrfout projection works in grads.
Below is a descriptor file from ARWpost as an example.
The model domain is using lambert conformal projection with grid spacing of 30 km.
title  OUTPUT FROM WRF V3.7 MODEL
pdef  231 171 lcc  35.178  110.000  116.000   86.000  60.00000  30.00000  110.00000  30000.000  30000.000
xdef  783 linear   57.03648   0.13513513
ydef  392 linear    7.01026   0.13513513
zdef   19 levels  



My question is:
[1] Do "xdef" and "ydef" mean the data have been interpolated with resolution of 0.13513513 deg? But the original resolution is approximately 0.27 deg.
[2] How are the xsize of 783 and ysize of 392 derived?
[3] If I would like to remap observations onto the wrf model output to facilitate comparisons, should I remap the obs onto the original 0.27deg-resolution grid, or the interpolated 0.135deg-res grid? Is the latter feasible? 


Your reply would be much appreciated!


Best,
Qi
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