Editing Temporal Data in Relative Mode

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