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First start Metview; at ECMWF, the command to use is metview (see Metview at ECMWF for details of Metview versions). You should see the main Metview desktop popping up.

You will create some icons yourself, but some are supplied for youNext get a copy of the icons needed for the tutorial. If you are at ECMWF then you can copy the these icons from the command line like with this

command:

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cp -R /home/graphics/cgx/tutorials/flextra_tutorial ~/metview 

Otherwise, please download the following file:

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titleDownload

wms_tutorial.tar

and save it in your $HOME/metview directory. You should see it appear on your main Metview desktop, from where you can right-click on it, then choose execute to extract the files.

You should now see a flextra_tutorial folder which contains the solutions and also some additional icons required by these exercises. You will work in the wms_tutorial folder so open it up. You should see the following contents:

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Please note that because the WMS client requires internet access you might need to configure your network proxy settings in Metview. This can be done by selecting ‘Preferences’ from the File menu in the toolbar of the Metview Desktop.

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Please be aware that this tutorial is strongly dependent on the availability of the selected WMS services and that of the network itself. Therefore it cannot be guaranteed that the exercises will work for you. Should you experience any WMS service related problems throughout the tutorial, you can still try out the icons provided in the ‘examples’ folder to see how the WMS client is working in Metview.

WMS basics

Preparations

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  1. Type the following command in a terminal window:

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download the following file:

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titleDownload

wms_tutorial.tar

and save it in your $HOME/metview directory. You should see it appear on your main Metview desktop, from where you can right-click on it, then choose execute to extract the files.

Last find the newly created  flextra_tutorial folder in the Metview desktop and open it

  1. Start Metview 4 with the following command:

metview4_new -slog &
The optional -slog switch will enable Metview to print detailed logging information to the standard output.
In your main Metview folder now you should find a 'flextra_tutorial' folder with the following contents (double-click to open).
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You should see the following contents:


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Introduction

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What is FLEXTRA?


FLEXTRA is an atmospheric trajectory model used by a growing large user community. It can be driven by meteorological input data from a variety of global and regional models including ECMWF analyses and forecasts.
FLEXTRA can compute both forward and background trajectories using various trajectory types such as: three-dimensional, model level, mixing layer, isobaric and isentropic trajectories. Trajectory computations can be carried out in the three different modes. These are as follows:

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FLEXTRA is a free software system released under the GNU General Public License V3.0. The joint homepage of FLEXTRA and FLEXPART (a Lagrangian particle dispersion model) is hosted by the Norwegian Institute for Air Research (NILU) and available at the following address:
http://transport.nilu.no/flexpart
This website contains a link to the latest available FLEXTRA documentation:
http://zardoz.nilu.no/~andreas/flextra/flextra3.html

Warning

Please note that FLEXTRA is not an ECMWF development. FLEXTRA is not distributed with Metview, but it has to be downloaded from the web site specified above and installed separately. It is installed at ECMWF though.

About the Metview interface

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We will further customise the plot by changing the axis value ranges and adding axis labels and grid-lines to it. To change these properties we need a Cartesian View icon (it can be found in the Visual Definitions icon drawer).
This time you do not need to create a new icon since there is one called 'xy_view' already prepared for you. Edit his icon to see how the view is constructed (please note that the axis properties are defined via the embedded Horizontal Axis and Vertical Axis icons). Then simply drag it into the Display Window and see how you plot has been changed.

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- Backward Trajectories

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