JP3267736B2 - Management method of spanning element in geographic information processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geographic information processing system, and more particularly, to a plurality of drawings managed in a geographic information processing system constructed in the form of a distributed database system. (Straddling element) It relates to a technique useful for managing.

In recent years, with the improvement of workstation performance, a system configuration (distributed database system) in which a plurality of workstations are interconnected via a LAN (local area network) and a database is distributed and used for each workstation has been realized. Accordingly, there is a need to apply a geographic information processing system to such a distributed database system to perform efficient system operation and management.

Generally, in a geographic information processing system, information for each drawing (name of elements included in each drawing, coordinate information, etc.)
Are closed in each drawing. Therefore, when such a geographic information processing system is applied to the distributed database system as described above, the “straddling element” as described above does not match between databases held in the respective workstations (that is, the database does not match).
May occur, which may lead to various inconveniences (data destruction, complicated database management). Therefore, when the geographic information processing system is applied to a distributed database system, it is demanded that such inconvenience does not occur.

[0004]

2. Description of the Related Art As shown in FIG. 3, for example, if an element (a "line segment" in the illustrated example) exists between two adjacent drawings A and B, that is, adjacent elements A and B are adjacent to each other. Consider the case where a “straddling element” exists for drawings A and B. In a conventionally known typical geographic information processing system, regarding a straddling element, a part included in the drawing A side is referred to as an element L1, and a part included in the drawing B side is referred to as an element L2. Of the element L2 on the drawing B side, the element number, the coordinates of the start point P3, and the coordinates of the end point P2 are managed together with the information on the element name, the element number, the coordinates of the start point P1 and the coordinates of the end point P2. Was. Similarly, as the information of the drawing B, the element name, the element number of the element L2, the coordinates of the start point P3 and the coordinates of the end point P2, the element name of the element L1 on the drawing A side, the element number, the coordinates of the start point P1, Information on the coordinates of the end point P2 is managed. That is,
The information of the adjacent drawings A and B overlapped each other with respect to the “straddling element”.

[0005]

In the conventional method described above, each drawing shares information with other drawings (that is,
Because of the overlap, the following problems arise when applied to the above-described distributed database system. For example, as shown in FIG. 7 as an example, when a mismatch occurs between one workstation (terminal 1) and another workstation (terminal 2) with respect to a line segment that is a “straddling element”, , The drawing A of the terminal 1 and the drawing on the right (Drawing B
) Has a line segment (indicated by a solid line), but if there is no line segment (indicated by a broken line) in the drawing B of the terminal 2 and the drawing on the left thereof (corresponding to the drawing A), each terminal 1 , 2 drawing information in LA
N causes inconvenience when transferring to another workstation (terminal 3).

That is, as shown in FIG. 7A, when the drawing information is transferred from the terminal 1 to the terminal 3 first (in the case of the transfer order →), the “straddling element” is stored in the database of the terminal 3. Is left (indicated by a solid line). In this case, the drawing A has affected the drawing B. On the other hand, as shown in FIG. 7B, when the drawing information is transferred to the terminal 3 first from the terminal 2 (in the case of the transfer order →), the line segment disappears (indicated by a broken line). . In this case, the drawing B has affected the drawing A. In other words, the contents of the database on the transfer side (terminal 3) will be changed (that is, data will be destroyed) depending on the transfer order of the drawing information from each of the terminals 1 and 2.

As described above, in the conventional method in which each drawing shares information with other drawings, when applied to a distributed database system, data is destroyed due to inconsistency of the database of each workstation. However, there is a problem that this is extremely likely to occur. Further, when data destruction occurs, an operation or the like for restoring the data to correct data is required, which has a disadvantage that the management of the database in each workstation is complicated.

An object of the present invention is to provide a geographic information processing system constructed in the form of a distributed database system in order to prevent data destruction due to inconsistency in the database of each workstation, in view of the problems in the prior art. Another object of the present invention is to facilitate database management.

[0009]

In order to solve the above-mentioned problems, according to the present invention, with respect to a straddling element, only information closed in each drawing including the element (that is, specific information which does not overlap with information in other drawings). ) To manage the straddling element based on the specific information.

Therefore, according to the present invention, as shown in the principle diagram of FIG. 1, a system in which a plurality of drawings are divided and elements included in each drawing are processed as geographic information is constructed in the form of a distributed database system. In the geographic information processing system, each workstation WSi of the system is provided.
Control means 1 for retrieving an element physically straddling an adjacent drawing in the plurality of drawings and logically controlling the processing as one element, ie, a straddling element;
And information on an element name for logically unique identification in the system and an element number for unique physical identification in the system for each drawing for all the elements included in each of the drawings. Element information including coordinate information specifying the position of each element and link information indicating whether the end point of each element is included in the drawing or on the boundary of the drawing. Storage means 2 stored in advance
The control means retrieves the element information of the first element from the storage means with respect to a first element specified among the elements included in the first drawing arbitrarily selected, and Decoding the link information of the element information to identify a second drawing adjacent to the first drawing, wherein the second drawing includes a second element having the same element name as the first element Or not, and determining whether or not the first and second elements constitute the straddling element based on the determination result. Is provided.

[0011]

In the storage means 2, each element of each drawing is managed so as to have specific connection information which is not shared with (ie does not overlap with) elements of other drawings as element information. Then, the control unit 1 searches for and manages the “straddling element” based on the specific connection information.

Therefore, in the present system (distributed database system), even if the drawing information is transferred from a different terminal to another terminal when there is a mismatch between the databases of the workstations (terminals). Each drawing does not affect other drawings. As a result, it is possible to solve the inconvenience (destruction of data, complicated management of the database) as seen in the conventional form.

The details of other structural features and operations of the present invention will be described with reference to the accompanying drawings and embodiments described below.

[0014]

FIG. 2 schematically shows a system configuration to which a straddling element management system in a geographic information processing system according to the present invention is applied. In the figure, reference numeral 10 denotes a processing control unit, which manages straddling elements according to the present invention, that is, a function of searching for elements that physically straddle adjacent drawings and controlling processing for logically treating them as one element. have. The specific processing contents will be described later. Reference numeral 11 denotes a drawing management unit having a drawing management file (not shown). The drawing management unit 11 stores in advance the drawing names (for example, “A” in FIG. 3, Information “B”) and coordinate information indicating where each drawing is located in the whole are stored.

Reference numeral 12 denotes an element management unit provided with an element management file (not shown).
Element information is stored for each element in all the elements included in each element. This element information is, for example, a line segment (element L
Speaking of (1, L2), information of an element name (the same element name "L" in both drawings A and B) for unique logical identification in the system and unique physical identification in the system (For example, element number “1” for drawing A, element number “2” for drawing B),
Coordinates specifying the position of each element (element L for drawing A)
Coordinates of the end points P1 and P2 of FIG.
Of the end points P2 and P3) and the end point P1 of each element.
... P3 are included in the drawings A and B or on the boundaries of the drawings.

This connection information is, as shown in FIG.
According to the position of the end point (start point or end point) of the element of interest in the drawing, the nine states (1) to (5) can be distinguished. That is, indicates that the endpoint of the element is included in the drawing (not on the boundary),
Indicates that the end points of the elements are on the boundaries of the drawing.

Returning to FIG. 2, reference numeral 13 denotes an input unit for giving an operator's instruction input through a keyboard or the like to the processing control unit 10, and 14 receives the control of the processing control unit 10 to visually display drawing information to the operator. 1 shows a display unit such as a CRT display. Note that the contents of the drawing management unit 11 (drawing management file) and the contents of the element management unit 12 (element management file) are fetched into the display unit 14 via the processing control unit 10 as appropriate, and are visually displayed. It has become.

Next, the straddling element retrieval processing by the system of FIG. 2 will be described with reference to FIGS. The flowchart shown in FIG. 5 is included in the displayed drawing A (the drawing B is not displayed yet) with respect to the line segment (element name L) extending between the drawing A and the drawing B as shown in FIG. After indicating the part (element L1) to be displayed, the drawing B is displayed, and the part (element L1)
The processing up to the search of 2) is shown.

First, in step 30, the operator instructs the input unit 13 on the display unit 14 to indicate the element L1 (line segment: element name L) on the drawing A side. Then, in step 31, the input unit 13 notifies the processing control unit 10 of the element number “1” of the element L1. Next step 32
, The processing control unit 10 requests the element information of the element number “1” to the element management unit 12. Then, in step 33, the element management unit 12 returns the element information of the element number “1” to the processing control unit 10. In the next step 34, the processing control unit 10 decodes the connection information of the received element information, and determines the end point of the element L1 on the drawing A side (FIG.
, P2) is located on the right boundary line of the drawing (in FIG. 4), and the drawing management unit 11 is inquired of the drawing name on the right based on the recognition. Then, in step 35, the drawing management unit 11 returns the drawing (drawing name B) on the right side of the drawing A to the processing control unit 10. In the next step 36, the processing control unit 10 requests the display unit 14 to display the drawing B. Then, in step 37, the display unit 14 displays the requested drawing B, and notifies the processing control unit 10 that the display has been completed.

In the next step 38, the processing control unit 1
0 inquires of the element management unit 12 whether or not there is an element L2 having the element name L in the elements of the drawing B (that is, determines whether or not there is the element L2 in the drawing B (YES) or not (NO). ). If the determination result is YES, the process proceeds to step 39, where the element management unit 12 returns the element information of the element L2 (element number “2”) in the drawing B to the processing control unit 10. As a result, the processing control unit 10
1 and the element L2 in the drawing B can be treated as one logical element, that is, a “straddling element”. Thereafter, this flow is “end”. On the other hand, step 38
In the case where the judgment result is NO, the element L1
Does not constitute a spanning element between the drawings A and B, the processing control unit 10 recognizes that this flow is "end".

As described above, according to the present embodiment, the element management unit 12 manages each element of each drawing so as to have specific connection information that does not overlap with elements of other drawings. The unit 10 can perform a search process and management of a “straddling element” based on the specific connection information as shown in the flowchart of FIG. Therefore, in the geographic information processing system constructed in the form of the distributed database system as shown in FIG. 6, a state in which inconsistency occurs between the terminal 1 and the terminal 2 regarding the “straddling element”, that is, the straddling element Although the terminal 1 has a line segment (displayed by a solid line) but not the terminal 2 (displayed by a broken line), the information of the drawing A and the information of the drawing B are LA.
N, each terminal 1, 2,
Regardless of the transfer order (→ or →) of the drawing information from, the contents of the database of the terminal 3 on the transfer side can be the same. That is, since the drawing A and the drawing B do not affect each other, it is possible to prevent data destruction caused by inconsistency as seen in the related art.

Further, since there is no data destruction, there is no need for an operation for restoring data as in the conventional type.
This makes it possible to easily manage the database in each terminal (workstation).

[0023]

As described above, according to the present invention, each element of each drawing managed by the geographic information processing system is provided with specific information which does not overlap with elements of other drawings. It is possible to prevent destruction of data due to inconsistencies in the database of each workstation even if the drawing information is transferred between workstations in a distributed database system because the straddling elements are managed based on And the management of each database can be easily performed.

[Brief description of the drawings]

FIG. 1 is a principle diagram of a straddling element management method in a geographic information processing system according to the present invention.

FIG. 2 is a block diagram schematically showing a system configuration to which a straddling element management method according to the present invention is applied.

FIG. 3 is an explanatory diagram of a straddling element.

FIG. 4 is an explanatory diagram of connection information of each element.

FIG. 5 is a flowchart illustrating an example of a straddling element search process by the system of FIG. 2;

FIG. 6 is an explanatory diagram of data destruction prevention based on the processing shown in FIG. 5;

FIG. 7 is an explanatory diagram of occurrence of data destruction in a conventional method.

[Explanation of symbols]

WSi workstation 1 control means (controls processing for retrieving an element physically straddling an adjacent drawing and logically treating it as one element, that is, straddling element) 2 storage means (each element in each drawing) For each case, element information including element name, element number, coordinate information and connection information is stored)

Claims (1)

(57) [Claims] 1. A geographic information processing system constructed in the form of a distributed database system in which a system divided into a plurality of drawings and elements included in each drawing are processed as geographic information is provided. A control unit (1) for searching for an element that physically spans an adjacent drawing in each of the plurality of drawings and logically controlling the element as a single element, that is, a straddling element; For each drawing, information on element names for unique logical identification within the system, information on element numbers for unique physical identification within the system, and The coordinate information specifying the position and the connection information indicating whether the end point of each element is included in the drawing or on the boundary of the drawing are included. Storage means for element information is stored in advance (2)
The control means extracts element information of the first element from the storage means with respect to a first element specified among the elements included in the first drawing arbitrarily selected, and Decoding the link information of the element information to identify a second drawing adjacent to the first drawing, wherein the second drawing includes a second element having the same element name as the first element Or not, and determining whether or not the first and second elements constitute the straddling element based on the determination result. Management method.