Fractional Window

Use the Database Tools > Array Channels > Fractional Window menu option (VAWINDOW2 GX), to extract a fractional window of an array channel to a new channel.

Fractional Window dialog options

Array channel to window	The array channel to window Script Parameter: VAWINDOW2.VA
Output channel	The name of an existing or new output channel Script Parameter: VAWINDOW2.VV
Start point (from 0.0)	The start edge of the required window frame. This can be any fractional value between 0.0 (the start of the array channel) and the width of the array channel less 1.0. Script Parameter: VAWINDOW2.START
End point (up to VA width)	The end of the required window frame. This value must be greater than the start point and less than the array width. Script Parameter: VAWINDOW2.END

Application Notes

Window a Single Channel is used to extract fractional windows of information from array channels. For example, this dialog option can be used to extract radiometric windows from 256 channel radiometric windows. The start and end of the window can be defined as fractional values.

The output window is the simple sum of values in the array channel and the fractional components of the start and end elements of the specified window. If any array values are dummy, the result will be dummy.

If the output channel does not exist, it will be created using the data type of the input array channel.