[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[IDV #NRK-557916]: How to display triangular finite elements mesh stored in Netcdf File?

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [IDV #NRK-557916]: How to display triangular finite elements mesh stored in Netcdf File?
  • Date: Thu, 19 Feb 2009 15:33:11 -0700
Matteo-
 
> I write you illustrating my problem and hoping you can help me in order
> to solve it.
> 
> The problem is the following (apparently, very simple):
> 
> <<< I need to display a map of a TRIANGULAR FINITE ELEMENT MESH stored
> in Netcdf file. Can be possible using your software to visualize it?
> >>>

We do not support these types of grids yet.  We have been waiting for
a standard to be agreed to on the structure to use.  If you are interested
in creating a standard, you could join the CF Conventions forum on this
topic:

https://cf-pcmdi.llnl.gov/trac/wiki/UnstructuredGrids

The only software I know that might handle this is Visit from LLNL:

https://wci.llnl.gov/codes/visit/

but I'm not sure if it does.

Sorry I can't be of more help at this time.

Don Murray

> I try to explain clearly what I have done to build up the TRIANGULAR
> FINITE ELEMENT MESH Netcdf file.
> 
> I have built a netcdf file (see below) with a unstructured grid
> (triangular mesh) following some example (FVCOM, QUODDY, etc.). The
> files' structure is more or less the same. Apparently, at the end of my
> work I have set up a normal Tin file (file of a triangular mesh) in
> Netcdf format.
> 
> At this point, I have tried to use NcBrowse and Panolopy softwares to
> visualize the mesh but it has been impossible. Let's take note that, at
> the contrary, the same programs worked normally with a regular grid
> representing the same variables.
> 
> Can you say me if your software is able to do visualize a TRIANGULAR
> FINITE ELEMENT MESH as mine? Or, can you give me the exact structure
> that I have to follow to create a TRIANGULAR FINITE ELEMENT MESH Netcdf
> file workable with your program (general standard).
> 
> If the answer to my question is positive I could be really interested
> to buy YOUR SOFTWARE.
> 
> At your disposal for any further question and clarification.
> 
> Thanks very much
> Matteo Previdi
> 
> CREA Srl
> Corso Milano 9 Verona
> emai:address@hidden
> 
> NetCDF file "MESH zirino3_7Dyn.nc"
> 
> --------------------------------------------------------------------------------
> 
> netcdf file:/C:/ModMef/MefOut/zirino3/MESH zirino3_7Dyn.nc {
> dimensions:
> Asse_X = 14429;
> Asse_Y = 14429;
> Asse_Z = 14429;
> Node = 14429;
> Cells = 25319;
> nNbd = 3722;
> Nbi = 4;
> Connections = 3;
> Time = UNLIMITED;   // (2 currently)   // (has coord.var)
> variables:
> float Asse_X(Node=14429);
> :standard_name = "Asse_X";
> :units = "degrees_east";
> :mesh = "Mesh";
> :actual_range = 12.131293f, 12.580233f; // float
> float Asse_Y(Node=14429);
> :standard_name = "Asse_Y";
> :units = "degrees_north";
> :mesh = "Mesh";
> :actual_range = 45.110603f, 45.496544f; // float
> float Asse_Z(Node=14429);
> :standard_name = "Asse_Z";
> :units = "[m]";
> :mesh = "Mesh";
> :actual_range = -1.0f, 34.57f; // float
> int Mesh(Connections=3, Cells=25319);
> :X_nodal_coordinate = "Asse_X";
> :Y_nodal_coordinate = "Asse_Y";
> :Z_nodal_coordinate = "Asse_Z";
> :standard_name = "cell_connectivity_indices";
> :spatial_dimension = "3";
> :topological_dimension = "2";
> :cell_type = "NC_TRI";
> :units = "index_start_1";
> int nNbd(nNbd=3722, Nbi=4);
> :long_name = "Boundary_Segment_Node_List";
> :units = "index_start_1";
> float REL(Time=2, Node=14429);
> :units = "[m]";
> :X_nodal_coordinate = "Asse_X";
> :Y_nodal_coordinate = "Asse_Y";
> :grid = "Mesh";
> :grid_location = "Edges";
> :positive = "Down";
> :long_name = "Bathymetry";
> :actual_range = -34.57f, 1.117f; // float
> float H(Time=2, Node=14429);
> :units = "[m]";
> :X_nodal_coordinate = "Asse_X";
> :Y_nodal_coordinate = "Asse_Y";
> :grid = "Mesh";
> :grid_location = "Edges";
> :actual_range = -0.47f, 1.009f; // float
> float 0001(Time=2, Node=14429);
> :units = "[u.i./m2]";
> :X_nodal_coordinate = "Asse_X";
> :Y_nodal_coordinate = "Asse_Y";
> :grid = "Mesh";
> :grid_location = "Edges";
> :actual_range = -0.47f, 1141.3494f; // float
> float U(Time=2, Node=14429);
> :units = "[m/s]";
> :X_nodal_coordinate = "Asse_X";
> :Y_nodal_coordinate = "Asse_Y";
> :grid = "Mesh";
> :grid_location = "Edges";
> :long_name = "Northward Water Velocity";
> :actual_range = -1.314f, 341.87106f; // float
> float V(Time=2, Node=14429);
> :units = "[m/s]";
> :X_nodal_coordinate = "Asse_X";
> :Y_nodal_coordinate = "Asse_Y";
> :grid = "Mesh";
> :grid_location = "Edges";
> :long_name = "Eastward Water Velocity";
> :actual_range = -1.4745f, 1.8604f; // float
> double Time(Time=2);
> :standard_name = "Time";
> :units = "hours since 1-1-1 00:00:00.0";
> :actual_range = 1.756944E7f, 1.7569442E7f; // float
> :Data_Simulazione = "2005-04-23 00:00:00.00 +00:00";
> :delta_t = "0000-00-00 01:00:00.00 +00:00";
> :n_time_step = "         2";
> :_CoordinateAxisType = "Time";
> 
> :Conventions = "COARDS";
> :Lib_ver = 10101; // int
> :Description = "NetCdf";
> :Model = "Sml by CREA Srl";
> :History = "Converted from c:\ModMef\MefOut\zirino3\zirino3_7.smh to ";
> :Creation_Time = "11  2 2009  H 16.19.19.019 (system local time)";
> }
> 


Ticket Details
===================
Ticket ID: NRK-557916
Department: Support IDV
Priority: Normal
Status: Open