In ImageWorks, the ``Elevation Channel'' selector allows the selection of the channel on which to operate. All operations will be applied to the selected channel. To select a different channel, click on the current channel, then select the new channel from the ones presented. The default channel is the one that is being shown or the previous channel edited.
In OrthoEngine, the user should specify the image channel as the first channel to load, and the DEM channel as the second channel to load. If the file contains only one channel (i.e., the DEM channel), then only the one channel can be loaded.
The ``RE-enhance'' button allows the user to re-enhance the current LUT while viewing the DEM. This is best used in conjunction with zooming in, which enables the user to distinguish elevations easily.
The ``Failed'' and ``Background'' labels identify input fields that allow the user to specify the failed and background values associated with the DEM. Areas where elevation data should exist, but for some reason is missing, are indicated by using the `Failed' value. Areas outside the DEM area where no elevation data is meant to exist are indicated by the `Background' value.
Note: many of the functions in the DEM editing panel will not be accessible unless a failed and background value are entered.
In ImageWorks, The ``Elevation at cursor'' field prints out the elevation at the current cursor position. This is supplied for user convenience. To see a window of values, the ``Numeric Window ...'' option from the ``Edit'' pulldown menu should be used.
In OrthoEngine, the elevation at the current cursor position is displayed at the bottom of the viewing window.