JViews Maps offers a mechanism that lets you load into memory only the data that you want to display in a manager view. This mechanism, known as load-on-demand, is extremely valuable, especially when very large maps are concerned. Let us consider a database storing maps of the whole world with a scale of 1/25,000. If these maps were scanned with a resolution of 300 DPI, the required storage space would be as follows:

Given the volume of this data, it is crucial to have a load-on-demand mechanism that will load and display only the portion of a map of direct interest.

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