Re: how to calculate the zonal mean, while the coordinates of the data are two dimension

You will have to interpolate to a rectiliner grid.
You must use ESMF regridding. See Example 13 at
    http://www.ncl.ucar.edu/Applications/ESMF.shtml
Good Luck

On 12/5/12 11:44 AM, tingting@ucar.edu wrote:
> Hi all,
> I have one question on how to calculate the zonal mean of data, of which
> the coordinates are all two dimension.
> The data I used are Sea Ice Concentrations (SIC) form NASA Goddard and
> NSIDC based on NASA Team algorithm, which are provided in the polar
> stereographic projection at a grid cell size of 25 x 25 km.
> Description of SIC data (part of coordinates ) , as follows:
> .............
> double latitude ( ygrid, xgrid )
> standard_name : latitude
> long_name : latitude
> units : degrees_north
> valid_range : ( 0, 90 )
> _FillValue : -999
>
> double longitude ( ygrid, xgrid )
> standard_name : longitude
> long_name : longitude
> units : degrees_east
> valid_range : ( -180, 180 )
> _FillValue : -999
>
> character projection ( ncl_scalar )
> grid_boundary_top_projected_y : 5850000
> grid_boundary_bottom_projected_y : -5350000
> grid_boundary_right_projected_x : 3750000
> grid_boundary_left_projected_x : -3850000
> parent_grid_cell_row_subset_start : 0
> parent_grid_cell_row_subset_end : 448
> parent_grid_cell_column_subset_start : 0
> parent_grid_cell_column_subset_end : 304
> .........
> Thanks for the help in advance.
> Tingting
>
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Received on Wed Dec 5 18:58:04 2012