System for transmitting figure data within a retrievable range a

Details System for transmitting figure data within a retrievable range a System for transmitting figure data within a retrievable range a

1996-05-06

1998-08-11

Feild, Joseph H.

Data processing: database and file management or data structures

Database design

Data structure types

345331, 707511, G06T 100, G09B 2900

Patent

active

057942587

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a system for transmitting data representing a map such as a detailed map on which public properties or facilities are indicated.


BACKGROUND ART

In a conventional mapping system, the geographical data and the facility data concerning public properties or facilities such as gas, electricity, waterworks and communications are stored in the large-sized mainframe computer of a parent station in order to maintain and retrieve the data. On the other hand, a personal computer (i.e., a computer of a child station) such as a small portable computer is used in a branch office or in an emergency car. A CD-ROM serving as an external memory medium, which contains the map data stored in the parent station is produced, for example, once a year. By reading the CD-ROM, the map data can be retrieved and displayed at a child station as well.
Incidentally, each time a gas facility and so forth is changed by a construction work, the facility data corresponding to the change is updated at a parent station. However, the facility data and so forth at a child station is not updated. This raises a problem that non-updated facility data must be used at a child station.
The present invention is made in view of the above problem and accordingly the object of this invention is to provide a system for transmitting data representing a figure, which enables to use updated data even at a child station.


DISCLOSURE OF INVENTION

The invention disclosed is a figure data transmitting system having a parent station and a child station, the parent station having data base and means for updating a figure data with a date and/or time of update, the figure data in the data base of the parent station being written into an external memory device, the external memory being sent from the parent station to the child station, the system comprising means provided at the child station for specifying a retrieval range at the child station and for transmitting the retrieval range and a date and/or time of update from the child station to the parent station; judging means provided at the parent station for receiving the retrieval range and the date and/or time transmitted from the child station, for comparing the date and/or time of update transmitted from the child station with a date and/or time of update at the parent station and for judging whether there exits a figure data updated after the date and/or time of update at the child station within the retrieval range or not; transmitting means provided at the parent station for transmitting an updated figure data to the child station when there exists the figure data updated after the date and/or time of update at the child station within the retrieval range; displaying means provided at a child station for displaying the updated figure data transmitted from the parent station.
In the above invention, the child station specifies a retrieval range and sends the retrieval range and a date and/or time of update to the parent station. The parent station receives the retrieval range and the date and/or time transmitted from the child station, compares the date and/or time of update transmitted from the child station with a date and/or time of update at the parent station, judges whether there exits a figure data updated after the date and/or time of update at the child station within the retrieval range or not, and transmits an updated figure data to the child station when there exists the figure data updated after the date and/or time of update at the child station within the retrieval range. The child station displays the updated figure data transmitted from the parent station. Therefore, the updated figure data may be used at a child station.
Another invention is a figure data transmitting system, wherein the parent station stores an update range data indicating a range of the updated figure, wherein the parent station receives the retrieval range and the date and/or time transmitted from the child station, compares the retrieval range with the update range data,

REFERENCES:
patent: 4675676 (1987-06-01), Takanabe et al.
patent: 5043919 (1991-08-01), Callaway et al.
patent: 5214757 (1993-05-01), Mauney et al.
patent: 5416902 (1995-05-01), Sato et al.
patent: 5471205 (1995-11-01), Izawa
patent: 5491780 (1996-02-01), Fyles et al.
patent: 5519769 (1996-05-01), Weinberger et al.
"Creation and Use of a Personal-Computer-Based Mobile Mapping System", 1992, Yoishi Ishikawa, 17 pages.

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