imported>Spohr Susanne at 09:24, 5 July 2018

2018-07-05T09:24:58Z

← Older revision		Revision as of 09:24, 5 July 2018
Line 1:		Line 1:
			__NOAUTOLINKS__
			__NOAUTOLINKTARGET__
	[[de:NCPLOT: DataSet definieren]]		[[de:NCPLOT: DataSet definieren]]

imported>Spohr Susanne: Created page with 'de:NCPLOT: DataSet definieren This page should help to find the right start, step and stride values. The parameters have to be specified in a ''Dataset'' block of the [[NCPL…'

2013-03-26T13:08:15Z

Created page with 'de:NCPLOT: DataSet definieren This page should help to find the right start, step and stride values. The parameters have to be specified in a ''Dataset'' block of the [[NCPL…'

New page

[[de:NCPLOT: DataSet definieren]]

This page should help to find the right start, step and stride values.
The parameters have to be specified in a ''Dataset'' block of the [[NCPLOT]] control file.

==Preliminary remark==
The command
<nowiki>
ncdump -h <filename>.nc
</nowiki>
shows the header of a CF-NetCDF file in ''CDL''-syntax.
The name of the offered variables and their dimensions can be found in this metadata.

1.) Dimensions of the variables
<nowiki>
dimensions:
nMesh2_node = 19508 ;
nMesh2_edge = 37784 ;
nMesh2_face = 18274 ;
nMesh2_time = 1 ;
two = 2 ;
nMaxMesh2_face_nodes = 4 ;
nMesh2_data_time = UNLIMITED ; // (4177 currently)
nMesh2_layer_2d = 1 ;
nMesh2_layer_3d = 50 ;
</nowiki>
Hint: The dimensions are at the beginning of the file.
 

2.) List of variables
<nowiki>
float Mesh2_face_Wasserstand_2d(nMesh2_data_time, nMesh2_face) ;
Mesh2_face_Wasserstand_2d:long_name = "Wasserstand [ face ]" ;
Mesh2_face_Wasserstand_2d:units = "m" ;
...

float Mesh2_face_Salzgehalt_3d(nMesh2_data_time, nMesh2_layer_3d, nMesh2_face) ;
Mesh2_face_Salzgehalt_3d:long_name = "Salzgehalt [ face ]" ;
Mesh2_face_Salzgehalt_2d:units = "1e-3" ;
</nowiki>
 

Hint:
# The DUMP file is in CDL syntax.
# The order of the dimensions specified in Fortran is the inverted order as in the DUMP file.
# The Fortran syntax is used for the steering data.
 

Example: Water level
<nowiki>
CDL : Mesh2_face_Wasserstand_2d(nMesh2_data_time, nMesh2_face)
Fortran : Mesh2_face_Wasserstand_2d(nMesh2_face, nMesh2_data_time)
</nowiki>
 

Example: Salinity
<nowiki>
CDL : Mesh2_face_Salzgehalt_3d(nMesh2_data_time, nMesh2_layer_3d, nMesh2_face)
Fortran : Mesh2_face_Salzgehalt_3d(nMesh2_face, nMesh2_layer_3d, nMesh2_data_time)
</nowiki>
 

==Example: Dataset 1==
The water level should be displayed. 
It should begin with the 1234th result time. 
Overall one picture should be generated. 
The water level should be displayed for each result.
<nowiki>
File = <fileName>.nc NETCDF
Variable = Mesh2_face_Wasserstand_2d
Start = 1 1234
Step = 18274 1
Stride = 1 1
</nowiki>
Conclusion: 
It is produced only one picture of the water level for the 1234-th output-date.
 

==Example: Dataset 2==
The water level should be displayed. 
It should begin with the 100th result time. 
The representations for 50 time points should be generated. 
Every sixth time point should be displayed.
<nowiki>
File = <fileName>.nc NETCDF
Variable = Mesh2_face_Wasserstand_2d
Start = 1 100
Step = 18274 50
Stride = 1 6
</nowiki>
Conclusion: 
50 images are produced.
 

==Example: Dataset 3==
The 3D-salinity should be displayed. 
It should begin with 5th layer and the 100th result time. 
The representations for 9 layers and 50 time points should be generated. 
Every fifth layer and every 6th time point should be displayed.
<nowiki>
File = <fileName>.nc NETCDF
Variable = Mesh2_face_Salzgehalt_3d
Start = 1 5 100
Step = 18274 9 50
Stride = 1 5 6
</nowiki>
Conclusion: 
50 x 9 = 450 images are produced. 
From the fifth till the 45th layer each 5th layer is displayed at each of the selected 50 time points.
 

==Summary==

# Use NCDUMP.
# Determine the dimensions.
# Determine the names of the variables and their dimensions.
# Invert the CDL order of dimensions.
# Determine start(:) (for location dimension = 1).
# Determine step(:) (for location dimension = max. number of locations).
# Determine stride(:) (for location dimension = 1).
 

----
back to [[NCPLOT.DAT]]

NCPLOT: Define DataSet - Revision history

imported>Spohr Susanne at 09:24, 5 July 2018

imported>Spohr Susanne: Created page with 'de:NCPLOT: DataSet definieren This page should help to find the right start, step and stride values. The parameters have to be specified in a ''Dataset'' block of the [[NCPL…'