Denso Corporation

Other

Nippondenso Co., Ltd.

Kousokuya, Inc.

Robert Boschgmbh

Hidetoshi Fujimoto

Hiroshi Takeuchi

Akio Samizu

Takayuki Suzuki

Hironobu Sugimoto

Takamitsu Suzuki

Akimasa Nanba

Nobuyuki Nakano

Takayuki Watanabe

Toru Ito

Toshio Shinjo

Yasuhiro Shimizu

Kenzo Ito

Masahiro Kimura

Toshio Nomura

Osamu Kanematsu

Takayuki Matsunaga

Yasutaka Atarashi

Atsushi Ichimura

Wataru Sugiura

Takashi Ishizaki

Yasuhiro Tooyama

Isao Ogawa

Hidenobu Suzuki

Kaoru Shibata

Kazunori Hanabusa

Takeshi Yamada

Mamoru Kainuma

Fumihiko Matsumura

A map data providing system stores map data including multiple section data in which a reference point indicated by absolute coordinates is set for each of multiple sections, and a map element is represented by relative coordinates to the reference point of the section to which the map element belongs, detects position coordinates of the vehicle based on a navigation signal, employs a difference between absolute coordinates of the map element indicated by the map data and absolute coordinates of the map element identified based on the relative position of the map element and the position coordinates of the vehicle as a deviation amount, calculates a correction amount based on the deviation amount, corrects the position information of the reference point by using the correction amount, and creates corrected map data indicating position coordinates of the map element.

Map data providing system using coordinate transformation and reference points

Map data includes, for each of multiple links used for representing a road in a map, a link record and a speed limit record for a certain link. The link records and the speed limit records of the multiple links for representing a road are collected to form separate data lists of respective attribute types, that is, a link record data list and a speed limit record data list, instead of collecting records by a unit of each link. The map data structured as separate attribute data lists of respective attribute data types for links in the map data, for example, establishes inter-attribute data association between different attribute data types for the certain link based on the arrangement orders of the respective attribute data types in the data list indicative of the same arrangement order of the multiple links.

Method for creating map data and map data utilization apparatus

A map data is disclosed. The map data comprises a link data and a segment data. The link data describes a characteristic of each link in a group of links on a link-by-link basis. The group of links forms a road network. The segment data relates to each segment in a group of segments on a segment-by-segment basis. The segments are defined in units of link string. Each link string is a string of multiple links and corresponds to a main road. Each link string terminates at least at an intersection of the main road. The multiple links are a part of the group of links. The segment data of each segment describes information on a storage destination of the link data corresponding to the link string that forms the each segment.

Map data, storage medium, and electronic apparatus

A vehicle navigation system includes: a route guidance element for searching an optimum route from a current position of a vehicle to a destination according to a normal map data and for guiding the optimum route by displaying the optimum route on a map screen image of a display; a deviation route retrieving element for retrieving a deviation route, which has a possibility that a user may deviate from the optimum route and enter into the deviation route although the vehicle is incapable of driving along the deviation route; and an attention notification element for outputting attention notification information in order to prevent the user from entering into the deviation route when the route guidance element guides the optimum route.

Vehicle navigation system

A map difference data generation apparatus includes: most recent and supplementary map data storage devices storing primary most recent and supplementary map data, respectively; a map update reflection device generating secondly most recent and supplementary map data according to an update of a first link, and generating tertiary most recent and supplementary map data according to an update of a second link; a determination device determining a dependency relationship between the update of the first and second links, in accordance with results of searching a route in the tertiary most recent and supplementary map data between first and second nodes, which are both ends of the second link; and a map difference data generation device generating map difference data, which defines a combination of the update of the first and second links, when the update of the first and second links have the dependency relationship.

Map difference data generation apparatus and map difference data generation method

In map data having link information, each of the links has reference information regarding a start point node of the link, a next link in a series of links, and an upper link. Further, links are memorized in a form of link list, and the position of the link in the link list is not changed in the course of adding/deleting a link, thereby enabling a direct reference to each of the links in the link list by the position of the link. The link information organized in the above-described manner enables the ease of the update of the map data as well as the speed-up of the calculation of, for example, a navigation route.

Apparatus, program, and method for map data update

A control circuit detects a current position of a subject vehicle on a map. Before executing a driving assistance application, the control circuit computes a map reliability degree by using a positioning accuracy coefficient, a time-based change coefficient, and an information accuracy coefficient. The positioning accuracy coefficient indicates a positioning accuracy of map data with respect to a target spot. The time-based change coefficient indicates a time-based change of the map data from the latest investigation for the target spot. The information accuracy coefficient indicates an accordance ratio of the map data relative to actual data with respect to multiple information items related to the target spot. The map data can be used for executing the driving assistance application when the product of (i) a required accuracy designated to the application and (ii) the computed map reliability degree is equal to or more than a predetermined value.

Driving assistance system

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.

Map data updating method

Branch-point image data has coordinates added thereto according to the distance from a branch point such as an intersection. When the vehicle is within a predetermined distance from a branch point on a suggested route, the coordinates of the present position of the vehicle and the coordinates added to the branch-point image data are compared to locate the present position on the image data, and a present-position mark is displayed superimposed on the branch-point image data. The displayed present-position mark moves according to the distance between the vehicle and the branch point.

Navigation system and storage medium

There is provided a map data access method and device capable of reading out from a recording medium the map data requested by a navigation system and providing them to the system whether C language, etc. or JAVA (trademark), etc. is employed to constitute a processing program on the navigation system side. In the recording medium, the map data and a reading method of the data are recorded in pairs in a map data section and a method section, respectively. When a navigation function section requests the map data, a data access section reads out desired data in a method (program) read out from the method section according to a requested application programming interface (API). The data read out are supplied as a byte array object to the navigation function section.

Map data access method for navigation and navigation system

When a vehicle is within a predetermined distance from an intersection during the execution of navigation operations, a navigation system displays an enlarged guide map of the same intersection. The guide map shows direction labels that are set for roads that are connected to a road to be approached by the vehicle. The direction labels are set for the connecting roads by tracking the connecting roads and by determining appropriate direction labels following a predetermined procedure. For example, names of tollgates, names of stations, names of special facilities, names of administrative units, names of highways or the like may be set as direction labels.

Vehicle navigation system and method for setting direction labels for

Route costs are computed using the Dijkstra algorithm based on link information and connection information and a destination route is set based on a connection of links which has the least route cost. The route cost is set to sub-nodes of each connection link. Therefore, optimal routes can be set even though traffic regulations such as no right turns or the like exist on certain nodes.

Navigation system having optimal destination route setting capability

In a map display system, map-forming data necessary for display of a display area and character data representing display areas are stored in a map data memory. A display area commander reads map-forming data indicating a specified display area out of the map data memory, and produces a display area instruction. A display character commander selects character data for a given point of the specified display area designated by the display area designation commander, and produces a display character instruction. On the basis of the display area instruction from the display area commander and the display character instruction from the display character commander, a map of the specified display area and characters in the specified display area are displayed on a display.

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Makinohara, Japan

Hidetoshi Fujimoto