A digital map display zooming method for continuously enlarging and reducing a displayed portion of a digital map as map information in digital form within a display screen is provided which comprises the steps of displaying the displayed portion of the digital map at the display screen, displaying a...http://www.google.com.mx/patents/US6411274?utm_source=gb-gplus-sharePatent US6411274 - Digital map display zooming method, digital map display zooming device, and storage medium for storing digital map display zooming program
