First, we'll load in some visible imagery from the Bow Echo Case Study that we used in the Gridded Data section of the workshop.

1. If other displays and data are already loaded, select the Edit→Remove All Displays and Data menu item or the icon in the toolbar to clear them out.
2. Open the Data Choosers. Click on the Images node in the chooser tree.
3. We'll load in some visible satellite imagery. In the Server: selector, choose adde.ucar.edu. In the Dataset: selector, choose CCS039. If either of these is not in the list, just type them in. When you have made your selections, click the Connect button.
4. The IDV connects to the specified server and retrieves the types of images available in the dataset. From the Image Type: selector, choose the 1 km GOES-8 Visible type.
5. You can either load in the last "n" images, or you can select by time. For this exercise, we want to select a subset of all available times:
• Click on theAbsolute times radio button.

  When this option is selected, the server is queried for a set of available times for that type and these are listed in the Times: panel.

• Select the 7 images from 1998-06-29 16:15:00Z through 1998-06-29 22:15:00Z.
• Click the Add Source button.
6. Compare three spatial subset options:

   In the Data Subset panel, there are Times, Region, and Advanced tabs.

   • In the Region tab, click on the drop down menu button and by default the Use Default Region option is selected.
   • Click the Create Display button. The images created in the Map View window cover the entire region of the dataset. Zoom in over the super cell in eastern Iowa
   • Remove the display and keep the data by click Trash icon in the legend panel
   • Back in the data subset panel, in the Region tab, click on the drop down menu button and choose the Select A Region option.
   • Draw a bonding box in eastern Iowa with left mouse button and click the Create Display button.
   • In the Map View window, zoom into the region in eastern Iowa covered with the convective cloud.
   • Remove the display and keep the data by click Trash icon in the legend panel, do not change the map view region in the Map View window.
   • Back in the data subset panel, in the Region tab, click on the drop down menu button and choose the Match Display Region option, click the Create Display button.
   • Keep images created in the last spatial subset option.
7. Change the background maps using the Default Background Maps Control. Turn on the North & Central America and the US Interstate Highways maps. Make sure all other maps are off. When you are finished, go back to the View Window.
8. Use the Displays→Locations→US→U.S. Cities menu to overlay some place names. Change the color of the location text to be white using the display control's Edit→Color menu.
9. Start the animation. In this loop, you will see a large super cell thunderstorm develop over Iowa during this period. Stop the animation and show the 20:15Z image.
10. Zoom in over the super cell in eastern Iowa


11. This is visible imagery at 1 kilometer resolution. You can use the Pixel Sampling slider to see what the image would look like at a lower resolution.
    • Move the slider to 5 to see the difference an image at 6 km resolution would look like.
    • Return the slider back to 0 before proceeding to the next exercise.
    • Do not clear this display.

Unidata IDV Workshop for version 6.1u1 > Accessing and Displaying Data > Displaying Satellite and Level III Radar Imagery