[ncl-talk] error in plot from data set of different number of grid points
tms_l
littithomas at gmail.com
Wed Dec 17 17:17:16 MST 2014
Hi,
I am plotting ud,vd & psl_clim using the following plot function .
*plot=gsn_csm_vector_scalar_map(wks,ud,vd,psl_clim,res)*
Variable: *ud*
Type: float
Total Size: 110592 bytes
27648 values
Number of Dimensions: 2
Dimensions and sizes: [144] x [192]
Coordinates:
Number Of Attributes: 1
_FillValue : -1.073742e+09
Variable: *vd*
Type: float
Total Size: 110592 bytes
27648 values
Number of Dimensions: 2
Dimensions and sizes: [144] x [192]
Coordinates:
Number Of Attributes: 1
_FillValue : -1.073742e+09
Variable: *psl_clim*
Type: float
Total Size: 111360 bytes
27840 values
Number of Dimensions: 2
Dimensions and sizes: [145] x [192]
Coordinates:
Number Of Attributes: 3
long_name : MSLP(hPa)& wind-850hPa (a)
_FillValue : 9.96921e+36
Thanks in advance,
Thomas
On Thu, Dec 18, 2014 at 6:26 AM, Mary Haley <haley at ucar.edu> wrote:
>
> Hi Thomas,
>
> In order to plot data over a map, either as vectors or contours, you have
> to provide latitude and longitude locations for your data.
>
> If you have a rectilinear grid, where the lat / lon are attached directly
> to the data as 1-dimensional coordinate variables, then the plotting
> routines will use these automatically.
>
> If you have 2-dimensional lat / lon coordinate points, then you either
> need to attach these to your data as special "lat2d" / "lon2d" attributes,
> or set the sfYArray / sfXArray resources.
>
> From your description, it sounds like you have a rectilinear grid, but
> your data variable may not be constructed properly. The error message is
> saying that it can't determine if you have valid lat / lon coordinate
> variables, which can happen if your "units" attribute is not one of the
> recognized values, like "degrees_north" or "degrees_east", and/or the
> coordinate variables somehow got stripped off your data variable. This can
> happen if you do a calculation on your data and put it in a new array,
> causing the metadata to be stripped off.
>
> Please do a "printVarSummary" on the data variables you are trying to
> plot, and send it back to ncl-talk so we can see what it looks like.
>
> Thanks,
>
> --Mary
>
>
> On Tue, Dec 16, 2014 at 8:23 PM, tms_l <littithomas at gmail.com> wrote:
>
>> Dear ncl users
>>
>> I would like to plot u & v components of wind along with mean sea level
>> pressure data.The wind data (time,level,lat_1,lon_1) is 4 dimensional and
>> mean sea level pressure data (time,lat,lon) 3 dimensional.
>>
>> Also the number of grids points are arranged differently in each data
>> sets.
>>
>> For wind data latitude , lat_1 = 144 points
>> longitude , lon_1 =192 points
>>
>> For mean sea level pressure latitude , lat =145
>> longitude, lon =192
>>
>> I am getting the error message as follows and the mean sea level pressure
>> data seems to plotted reversely..Is there any function to deal with data
>> sets of different grid points or how can solve this issue? Any help will be
>> appreciated.
>>
>>
>> error message :::::::
>> (0) check_for_y_lat_coord: Warning: Data either does not contain a
>> valid latitude coordinate array or doesn't contain one at all.
>> (0) A valid latitude coordinate array should have a 'units' attribute
>> equal to one of the following values:
>> (0) 'degrees_north' 'degrees-north' 'degree_north' 'degrees
>> north' 'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg
>> north'
>> (0) check_for_lon_coord: Warning: Data either does not contain a
>> valid longitude coordinate array or doesn't contain one at all.
>> (0) A valid longitude coordinate array should have a 'units'
>> attribute equal to one of the following values:
>> (0) 'degrees_east' 'degrees-east' 'degree_east' 'degrees east'
>> 'degrees_E' 'Degrees_east' 'degree_E' 'degreeE' 'degreesE' 'deg east'
>> (0) check_for_y_lat_coord: Warning: Data either does not contain a
>> valid latitude coordinate array or doesn't contain one at all.
>> (0) A valid latitude coordinate array should have a 'units' attribute
>> equal to one of the following values:
>> (0) 'degrees_north' 'degrees-north' 'degree_north' 'degrees
>> north' 'degrees_N' 'Degrees_north' 'degree_N' 'degreeN' 'degreesN' 'deg
>> north'
>> (0) check_for_lon_coord: Warning: Data either does not contain a
>> valid longitude coordinate array or doesn't contain one at all.
>> (0) A valid longitude coordinate array should have a 'units'
>> attribute equal to one of the following values:
>> (0) 'degrees_east' 'degrees-east' 'degree_east' 'degrees east'
>> 'degrees_E' 'Degrees_east' 'degree_E' 'degreeE' 'degreesE' 'deg east'
>>
>>
>>
>> Regards
>>
>> Thomas
>>
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