TELEMAC-MASCARET Forum: Export velocity vector to open in GIS (1/1)

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TOPIC: Export velocity vector to open in GIS

Export velocity vector to open in GIS 9 years 5 months ago #17069

Hello,

I've been trying to export velocity vector either from Fudaa POST or Blue Kenue but I can't find a way to be able to open it with Mapinfo or Q-GIS.
If I export the nodes from Fudaa, I'm loosing the direction information (only exporting nodes with velocity) and from blue Kenue I'm exporting it in t3v which I can't read.
I guess I can find a way to map my vectors directly in the GIS software from the data in the .t3v, but I'd like to know if there is not an easiest way to do it? For example to export in .shp? If not is there a way to convert .t3v in another format?

Thank you in advance.

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Export velocity vector to open in GIS 9 years 5 months ago #17070

Serrer
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This is because GIS systems like MapInfo don't understand vector data.
Also *.shp files can only store scalar data.
(quantities having magnitude and direction.)

The t3v file is ASCII so you can decode it easily with a program or a script.
Also you can save the t3v as a Tecplot UV file
See "File->Save Copy As"

Using the calculator you can extract the magnitude and/or direction as separate scalar quantities.

Martin

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The following user(s) said Thank You: RSU

Export velocity vector to open in GIS 9 years 5 months ago #17071

smullan

When you have your vector data in an ASCII format that can be imported into a GIS like ArcMap, you can follow a workflow like this to manipulate and map it:

blogs.esri.com/esri/arcgis/2013/07/17/di...rom-u-and-v-vectors/

ArcMap can deal with geographic time-series in NetCDF format. See this video tutorial: video.arcgis.com/watch/2107/visualizing-netcdf-data-in-arcmap

Unfortunately, I don't know how to rearrange/reformat Blue Kenue (or ASCII) outputs into a NetCDF format readable by ArcMap (or another GIS).

-Sean

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Export velocity vector to open in GIS 9 years 5 months ago #17074

RSU	Thank you both for your answers. Sean, I unfortunately don't have access to ArcMap so I won't be able to use your tips. I'll try with a script to read the Tecplot file. Thanks again Rafael
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Export velocity vector to open in GIS 9 years 5 months ago #17081

Serrer OFFLINE Moderator Posts: 720 Thank you received: 304	Hi Rafael, If you're going to create a script to read the Tecplot file you might just as well read the t3v file. Other than the header, there is no difference. They both consist of 2 sections. The first contains the node data as in x,y,u,v the second contains the element connectivity as in node1,node2,node3 Martin
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Export velocity vector to open in GIS 9 years 5 months ago #17083

Serrer OFFLINE Moderator Posts: 720 Thank you received: 304	Hi again Rafael, Another alternative is to use Uwe Merkels Selafin plugin for QGIS. See www.uwe-merkel.com/wordpress/?p=1219 I should have thought of this sooner... Martin
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