McIDAS Learning Guide
Version 2006

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Satellite Imagery - Copying and Displaying Images

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 nearly 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 4.37 3.64 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 4.35 3.63 1335 x 1608

   The Latitude and Longitude values listed above are the actual resolution values at the center point of the image.


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 STA=KBOS;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 4.37 3.63 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 7.39 5.15 480 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=MOB 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.

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