Hitachi, Ltd.

Kazuo Tsutsui

Keiro Muro

Mikio Yoda

Kazuaki Iwamura

Manabu Fukushima

Yasuei Nomoto

Nobuhiro Ishimaru

A drawing management device for managing the drawing of an entire facility, such as a water supply facility, as digital information. This device includes a unit for storing drawings with priorities obtained by separating the entire facility drawing into sub-facility drawings located at plural levels, a selective display designating unit for displaying a desired sub-facility drawing obtained by selecting the number of levels considering the priority from the storing unit, and a display unit for displaying the desired sub-facility drawing in response to the signal from the selective display designating unit. By suitably selecting a desired level considering the priority, only a necessary and sufficient facility drawing can be displayed swiftly.

Drawing management device having ability to retrieve and display a desired amount of data within a desired display time

A figure management system in which plural kinds of figures concerning the same part to be managed are modified. The figure management system includes a figure DB for storing data of figures including topological figures, an attribute DB for storing object attribute data, input and output devices, and a computer for managing figure and object attribute data. An ID code common to features indicating the same object is assigned. On input of a new figure, feature-attribute matching is performed between a feature having no ID code on the new figure and existent object attribute data. If any inconsistency is found the feature is indicated as a discrepant feature or a renewed feature.

Figure management system and figure modifying method by using figure management system

The present invention offers a feature data management method which provides data indicating created time and destroyed time of geographic object for feature data, thereby increasing the speed and facilitating a search in time direction. By this method, for example, if the building C is built at time Ts and destroyed at time Te, created time Ts and destroyed time Te of geographic object C are registered in the feature data, whereby it can be managed by a database that the geographic object C existed only between times Ts and Te.

Method of managing feature data

Drawing management device having ability to retrieve and display a

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Hitachiota, Japan

Kazuo Tsutsui