Information system, terminal device, and information center device
First Claim
1. An information system including a terminal device and an information center device,the terminal device comprising:
- a terminal storage unit capable of storing block maps, which are divided on a block-by-block basis, together with their generation information; and
a terminal control unit for transmitting information on a departure place, a destination, and generation information of block maps stored in the terminal storage unit to the information center device and for storing block maps and generation information transmitted from the information center device in the terminal storage unit,the information center device comprising;
a center storage unit for storing block maps divided on a block-by-block basis, their generation information, and information on intergenerational road updating; and
a center control unit for computing a guided route based on the departure place and the destination transmitted from the terminal device,the center control unit for determining whether or not a latest block map not in the terminal device, of block maps containing the guided route, is present in the center storage unit, based on the generation information transmitted from the terminal device and information stored in the center storage unit, whereinwhen the latest block map is determined to be present, the center control unit transmits the latest block map and its generation information to the terminal device and further determines whether or not a newly opened road connected to the computed guided route is contained in the latest block map, based on the generation information transmitted from the terminal device and information stored in the center storage unit, andwhen the newly opened road is determined to be preent, the center control unit transmits not only the latest block map containing the guided route but also a block map containing the newly opened road to the terminal device.
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Accused Products
Abstract
An information center device computes a guided route. It selects a newly opened road connecting to the guided route and traces the newly opened road from the connection point to a point at which the newly opened road intersects another road. Then, it determines block maps containing the traced newly opened road as those to be transmitted to the automobile navigation system. Therefore, the automobile navigation system can utilize block maps containing the newly opened road connected to the guided route as well as block maps associated with the guided route. As a result, the user can get information on where the newly opened road leads and connects, and easily deviate from the guided route and select a route going through the newly opened road at his/her own will.
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Citations
7 Claims
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1. An information system including a terminal device and an information center device,
the terminal device comprising: -
a terminal storage unit capable of storing block maps, which are divided on a block-by-block basis, together with their generation information; and a terminal control unit for transmitting information on a departure place, a destination, and generation information of block maps stored in the terminal storage unit to the information center device and for storing block maps and generation information transmitted from the information center device in the terminal storage unit, the information center device comprising; a center storage unit for storing block maps divided on a block-by-block basis, their generation information, and information on intergenerational road updating; and a center control unit for computing a guided route based on the departure place and the destination transmitted from the terminal device, the center control unit for determining whether or not a latest block map not in the terminal device, of block maps containing the guided route, is present in the center storage unit, based on the generation information transmitted from the terminal device and information stored in the center storage unit, wherein when the latest block map is determined to be present, the center control unit transmits the latest block map and its generation information to the terminal device and further determines whether or not a newly opened road connected to the computed guided route is contained in the latest block map, based on the generation information transmitted from the terminal device and information stored in the center storage unit, and when the newly opened road is determined to be preent, the center control unit transmits not only the latest block map containing the guided route but also a block map containing the newly opened road to the terminal device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification