Map data updating method

Abstract

An information center has an all-road updating data and a main-road updating data. The all-road updating data is a difference of all roads extracted from an all-road map data, and the main-road updating map data is a difference of specified roads extracted from the all-road map data. A map display system executes a reverse-updating to return the map data to a previous state not updated with the main-road updated map data, when its map data has already been updated with the main-road updated map data. The map display system then executes updating of the map data with the all-road updated map data.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:

FIG. 1 is a block diagram showing a map display system in a vehicle and an information center according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing a relation between all-road data, main-road data and map updating data;

FIG. 3 is a sequence diagram showing operation processing of the map display system and the information center in the embodiment;

FIG. 4 is a flow diagram showing map updating processing by a control circuit of the map display system;

FIG. 5 is a schematic diagram showing version-up of a map data;

FIG. 6 is an explanatory diagram showing updating of a map data in case of updating a main road in each section;

FIGS. 7A to 7D are explanatory diagrams showing updating of a map data in sequence in case of updating a main road in each section;

FIG. 8 is a schematic diagram showing another version-up of a map data; and

FIG. 9 is a schematic diagram showing a relation between all-road map data, main-road data and map updating data in a related art.

Claims

1. A map data updating method comprising: retrieving from an information center a first-road updating data or a second-road updating data, the first-road updating data being a difference of all roads extracted from an all-road map data covering all roads and the second-road updating data being a difference of specific-type roads extracted from the all-road map data; andupdating a map data of a map display system with retrieved updating data, wherein the updating includes checking whether the map data of the map display system has already been updated with the second-road updating data, when updating the map data by retrieving the first-road updating map data,executing a reverse-updating to return the map data updated with the second-road updating data to a previous map data, which is before being updated with the second-road updating data, when the map data has already been updated with the second-road updating map data, andupdating the map data with the first-road updating data after the reverse-updating.

2. The map data updating method according to claim 1, wherein the map data is updated with the first-road updating map data without the reverse-updating, when the map data has not been updated with the second-road updating data,

3. The map data updating method according to claim 1, wherein the map data is updated with the second-road updating data without the reverse-updating, when the first-road is not updated.

4. The map data updating method according to claim 2, wherein the map data is updated with the second-road updating data without the reverse-updating, when the first-road is not updated.