In this exercise, you will copy and display areas with the IMGCOPY and IMGDISP commands.

1. Show frame 4, copy the first GOES-7 4km Vis image to position 1 in your MYDATA/TEST-IMAGES (AKA TI) dataset, and display the image on frame 4. The SIZE=ALL keyword copies the entire image to the destination dataset.

   Type: SF 4

   Type: IMGCOPY GV4.1 TI.1 SIZE=ALL;IMGDISP TI.1 4

2. List the two image directories

   Type: IMGLIST GV4.1 FORM=BAND;IMGLIST TI.1 FORM=BAND

   Notice that the images now contain the same information and the image resolutions are the same.

   
   Image file directory listing for:GV4
    Pos Satellite/         Date       Time      Center      Res (km)   Image_Size  
        sensor                                 Lat  Lon    Lat   Lon               
    --- -------------  ------------  --------  ---- ----  ----- ----- ------------ 
      1  GOES-7        13 MAR 93072  17:01:00    26   87                           
       Band: 1   0.65 um Daytime cloud detection            4.0   4.0  1335 x 1608 
   
   Image file directory listing for:TI                                             
    Pos Satellite/         Date       Time      Center      Res (km)   Image_Size  
        sensor                                 Lat  Lon    Lat   Lon               
    --- -------------  ------------  --------  ---- ----  ----- ----- ------------ 
      1  GOES-7        13 MAR 93072  17:01:00    26   87                           
       Band: 1   0.65 um Daytime cloud detection            4.0   4.0  1335 x 1608 
   

3. Show frame 5, copy the first GOES-7 4km IR image to the second position in your TI dataset, and display the image on frame 5 centered on Boston.

   Type: SF 5

   Type: IMGCOPY GI4.1 TI.2 STATION=BOS;IMGDISP TI.2 5

4. List the two image directories.

   Type: IMGLIST GI4.1 FORM=BAND;IMGLIST TI.2 FORM=BAND

   In GI4.1, the image size is 1335 X 1608. Notice that the image size for TI.2 is 480 X 640 on image TI.2. If the SIZE=ALL keyword is not specified, a 480 by 640 image sector is copied to the new area (the size of the image frame).

   
   Image file directory listing for:GI4
    Pos Satellite/         Date       Time      Center      Res (km)   Image_Size  
        sensor                                 Lat  Lon    Lat   Lon               
    --- -------------  ------------  --------  ---- ----  ----- ----- ------------ 
      1  GOES-7 IR     13 MAR 93072  17:01:00    26   87                           
       Band: 8  11.2 um Night cloud detection, sfc temp     4.0   4.0  1335 x 1608 
   
   Image file directory listing for:TI                                             
    Pos Satellite/         Date       Time      Center      Res (km)   Image_Size  
        sensor                                 Lat  Lon    Lat   Lon               
    --- -------------  ------------  --------  ---- ----  ----- ----- ------------ 
      2  GOES-7 IR     13 MAR 93072  17:01:00    42   71                           
       Band: 8  11.2 um Night cloud detection, sfc temp     4.0   4.0   480 x  640 
    
   

5. Show frame 6, copy the latest GOES-7 4km Visible image to TI.3 centered on Mobile, Alabama, and increase the resolution by a factor of 2. Display it on frame 6.

   Type: SF 6;IMGCOPY GV4 TI.3 STATION=KMOB MAG=2;IMGDISP TI.3 6

   The image is displayed on frame 6 with a resolution of 2 km.

6. List the two images to compare image resolutions. Note that the lat and lon resolution values are different between the images.

   Type: IMGLIST GV4 FORM=BAND;IMGLIST TI.3 FORM=BAND

   The original image (BLIZZARD/G7-VIS-4K.3) had a resolution of 4 km and the new area (TI.3) has a resolution of 2 km. This is a blow up.

7. Display a loop of Meteosat images from 17 to 18 UTC on frames 4 through 6 and use the REFRESH keyword to plot a high resolution map on each of the images.

   Type: IMGDISP BLIZZARD/M3-IR TIME=17 18 ALL=4 6 REFRESH='MAP VH GRA=(GRA) IMA=(IMA)'

   Notice that the numbers placed into the MAP command's GRA and IMA keywords take the place of (GRA) and (IMA) and now match the image frame numbers of the loop.