McIDAS-X Learning Guide
Version 2020

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Satellite Imagery - Using Briefing Windows

In addition to displaying loops in the Image Window, you can also create briefing windows to view saved loops. Each briefing window can display a frame or loop different from those currently shown in the Image Window or other briefing windows.

In this exercise, you will display a sequence of GOES-16 visible and infrared image with the same geographical coverage. You will then create two briefing frames, so that you can view the images at the same time.

  1. Erase the graphics in frames 1 through 6.

    Type:    ERASE G 1 6

  2. Display the first GOES-16 0.5km Visible image area on frame 1, centering the image on earth coordinates 30° N and 81° W. Use the SF= keyword to automatically display the frame. Note: The data in positions 50 through 52 on the real time server may be night time images for the visible data.

    Type:    IMGDISP G16FD.50 1 LATLON=30 81 BAND=2 MAG=-4 SF=YES

  3. Display the next two GOES-16 visible images on frames 2 and 3, centering the images on coordinates 30° N and 81° W.

    Type:    IMGDISP G16FD.51 2 LATLON=30 81 BAND=2 MAG=-4; IMGDISP G16FD.52 3 LATLON=30 81 BAND=2 MAG=-4

  4. Display the three GOES- 16 infrared images, which begin in position 50, on frames opposite the GOES-16 visible images. The repeat factor (3) loads all three images with one IMGDISP command.

    Type:    IMGDISP G16FD.50 OPP LATLON=30 81 BAND=13 REPEAT=3

    You are using the same coordinates, 30° N and 81° W, to load the images. MAG=-4 used with the visible display will blowdown band 2 to the same domain as the band 13 images. The repeat factor 3 displays three images in sequence, on frames 11, 12, and 13. Note: When using opposite frames on a session other than 20 frames, the opposite frame numbers may vary.

  5. Set the loop, change the dwell rate, and loop the images.

    Type:    LS 1-3
    Type:   DR 5
    Press:   Alt L

    You should see the loop of the GOES-16 visible images on frames 1 through 3.

  6. Toggle to the opposite loop to compare the images. Then stop the loop.

    Press:   Alt O

    You should see the loop of the GOES-16 infrared images on frames 11 through 13.

  7. Create a text file that will be used to create briefing frames.

    Save the file BRIEF.SYNC in your $HOME/mcidas/data directory as a text file.

  8. Create two briefing windows that will have frames 1-3 in one briefing window, and frames 11-13 in the other briefing window.

    Type:    SYNC BRIEF.SYNC

  9. Close the briefing windows by clicking on the upper-left corner menu bar, and selecting CLOSE from the window menu.

  10. Exit McIDAS

    Type:    EXIT

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