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

For example, this dialog can be used to extract radiometric windows from a radiometric dataset. The start and end positions of the window can be specified as fractional values.

The output window is calculated as the simple sum of the values in the array channel, including the fractional components of the start and end elements within the specified window. If any array values are marked as dummy, the resulting output will also be dummy.

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