This exercise introduces ODB data and some ways that Metview can use it. To save time, we will mostly use pre-prepared icons. Enter the ODB folder to do these exercises. Retrieving the ODB dataThe 'ret_temp' MARS Retrieval icon is already prepared for you to fetch Land TEMP ODB data from MARS from 3 days ago. Edit the icon to see which parameters are set. The most important ones are these: Parameter | Value | Notes |
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Type | MFB | Mondb feedback | Reportype | 16022 | land TEMP | Obsgroup | 17 | Conventional |
Close the icon editor and perform the data retrieval by choosing execute from the icon's context menu. Right-click examine the icon to bring up Metview's ODB Examiner tool. Here you can see the metadata (Columns tab) and the actual data values themselves (Data tab). Close the ODB Examiner. Save a local copy of the ODB data to the current folder by right-clicking Save result on the ret_temp icon; save as 'temp.odb'. A few seconds later an ODB Database icon (Figure 12) with the given name will appear at the bottom of your folder. We will work with this to avoid repeating the retrieval. Using the ODB VisualiserWe will select and visualise the 500 hPa temperature values from our ODB using the 'vis_temp' ODB Visualiser icon. Now edit the vis_temp icon. First, drop your ODB Database icon into the ODB Data field. Next, specify the where statement of the query in the ODB Where parameter as: Code Block |
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varno = 2 and vertco_reference_1=50000 |
Save these settings, then right-click visualise the 'vis_temp' icon to generate the plot. Then drag the the provided Symbol Plotting, Coastlines, |