Map display device and program for map display

Abstract

Map display system and program for map display to smoothly perform scrolling operation of map display using compressed data without generating any time lag of display. The map display system has a primary storing memory (4) for storing map data and a drawing memory (6) for drawing them and displaying the data of a display region on a display. Further, the system comprises a data decompression processing means (3) for storing the map data reading and decompressing compression map data divided into blocks and stored to a data storage medium (1) in block units to the primary memory (4), a drawing processing means (5) for drawing the map data stored to the primary storing memory (4) to the drawing memory (6), and a display control means (7) for displaying the data of the display region from a drawing region of the drawing memory (6) on the display (8) by determining the display region. When the data of the display region does not exist in the primary storing memory (4), the compression map data are read to be decompressed from the data storage medium (1) with the data decompression processing means (3).

Description

technical field [0001] The present invention relates to a temporary storage memory for storing map data and a drawing memory for drawing map data, displaying data of a display area in the drawing area of ​​the drawing memory on a display, and editing and displaying a map according to selection of editing information A map display device and a program for map display. Background technique [0002] In the navigation device, on the map on the screen, for example, simulate driving on the route from the current position to the destination, and display it sequentially, or track and display the current position according to the actual vehicle driving, or display the set departure point and destination on the map When following a detour, etc., it is necessary to scroll the map on the screen. [0003] For example, when displaying the current location and route on the map and scrolling the map, set a judgment box on the inside of the currently displayed range, and perform scrolling c...

AI Technical Summary

Problems solved by technology

However, in this case, it is necessary to store two storage media for the satellite photo data of the same place, and there is a problem that the cost of the entire device is increased.

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