64 lines
2.5 KiB
HTML
64 lines
2.5 KiB
HTML
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<html>
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<title>GFESuite Documentation - Editing Temporal Data in Relative Mode</title>
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<body>
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<h1 align=center>Editing Temporal Data in Relative Mode</h1>
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<hr width="100%">
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<ul>
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<li CLASS="4Heading">
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<b>Purpose:</b> Modify scalar grid values in Relative Edit mode</li>
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</ul>
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<div CLASS="Body">The previous temporal editor exercises demonstrated how
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TE Absolute mode works. Every time you make a change to the temporal value,
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that value is assigned to the entire area you selected in the spatial editor.
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TE Relative mode works differently in that the relative change is applied
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to the selected area. For example, if you made a +5 degree change to your
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temperature time-series, 5 degrees is added to every point in the selected
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area. This preserves the relative gradients in the area which is sometimes
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very desirable.</div>
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<div CLASS="Body">Before you begin: Set up your GFE so that the spatial
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and temporal editors are visible. Load T (temperature) via the Weather
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Element->Weather Element Browser... dialog if T is not loaded already.</div>
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<div CLASS="Step-First">From the main menu, check to make sure that GFE->Editing
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Preferences->Temporal Editor Mode: Relative is on.</div>
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<ol>
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<li CLASS="Step">
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Make, or find a temperature grid and display it as an image in the spatial
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editor.</li>
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<li CLASS="Step">
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Use the Select Points tool to define an edit area the size of a few counties.
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Try to select an area where there is a temperature gradient.</li>
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<li CLASS="Step">
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Find the T (temperature) weather element in the temporal editor. Vertically
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stretch the size of the temporal editor pane so that there's plenty of
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room to see the time series display.</li>
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<li CLASS="Step">
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In the temporal scale, located to the left of the time series display,
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click MB2 to zoom in until the minimum and maximum values are about 20
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degrees F apart.</li>
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<li CLASS="Step">
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Find the data point in the time series that represents the grid displayed
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in the spatial editor. This point is identified by the dotted yellow line.</li>
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<li CLASS="Step">
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Adjust this data point about 5 to 10 degrees higher. Note the change in
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the spatial editor display. The 5-10 degree change you applied to the time-series
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point has been applied to all of the points inside the selected area. The
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gradient that was present before the temporal edit should still exist.</li>
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<li CLASS="Step">
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Use the MB1 drag operation in the temporal editor to modify several grids
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with the same operation. Step through these edited grids to verify that
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the data were modified inside the selected area.</li>
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</ol>
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</body>
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</html>
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