When loading a high resolution satellite imagery with the Adaptive Resolution turned on, the IDV calculates the resolution of the view window, sets the magnification factors dynamically, and loads a sufficient amount of the data to generate an image at the correct resolution. With the Match Display Region option turned on, a rubber band box (RBB) interface allows the user to zoom in/out or change the projection, forcing the IDV to recalculate the magnification factors and get higher/lower resolution data. This feature improves the IDV memory usage and performance significantly.

The Adaptive Resolution is a property in the User Preference. It can also be set in the Projections drop down menu of main view window. If a display has been created without the Adaptive Resolution turned on, it can be changed by selecting the option under View→Match Display Region drop down menu in the same display control.

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. In the Server: selector, choose adde.ucar.edu. In the Dataset: selector, choose GINIEAST, click the Connect button.
4. From the Image Type: selector, choose the GINI 1 km VIS East CONUS type.
5. You can either load in the last "n" images, or you can select by time. For this exercise, we want to select 5 most recent of the relative times.
6. Click the Add Source button.
7. Match display region:
   • In the Map View window, zoom into the region of interested.
   • In the Data Subset panel, click on the Region tab and click on the drop down menu button and choose the Match Display Region option.
   • Click the Create Display button.
8. Use the View→Match Display Region menu in the same display control to check and make sure the Match Display Region option has been selected. If a different menu item under the Region tab is selected, this property can be changed in this drop down menu.
9. In the Map View window, use the combination of Shift and left mouse button to create rubber band box RBB.
10. Zoom in and out and draw RBB to different areas, and check the data sampling factor that is shown in the side legend.

Unidata IDV Workshop for version 5.7 > Accessing and Displaying Data > Displaying Satellite and Level III Radar Imagery