7. Coding rule & function of SPMODEL 


variable
xy_data	: grid data
w_data		: spectral data

transformation function
w_xy(xy_data)	: spectral transformation
xy_w(w_data)		: inverce transformation

operator function
xy_GradLon_w(w_data)	: gradient (longitude)
xy_GradLat_w(w_data)	: gradient (latitude)
w_Div_xy_xy(xy_data, xy_data)	: divergence
w_Jacobian_w_w(w_data, w_data)	: Jacobian
w_Lapla_w(w_data)			: Laplacian