Looping GEMPAK Displays

15 Looping GEMPAK Displays

Generating loops of GEMPAK images can be accomplished several ways. For preparing map briefings, it is often convenient to pregenerate the individual frames using the NTRANS meta device driver, and looping the resultant images with NTRANS. Interactive briefings are done operationally using NMAP (the SPF function makes routine displays easy to recall).

For most uses, loops can be accomplished from the GEMPAK user interface and using the XW (X-window) display device. By specifying a series of map times, the individual frames are drawn consecutively when the program is run. After the individual frames are drawn, they may be viewed using the following commands at the GEMPAK prompt:

   ;loop
   ;step
   ;back
   ;reverse
   ;N        N=1(slow) though 5(fast),         default is 3

Click the left mouse buttonin the XW display to stop looping.

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