JP3312959B2 - Leader automatic creation method - Google Patents

Abstract

PURPOSE:To provide a facility control drawing where plural leader lines set concentratedly and explanatory information to be entered for the lines do not get complicated. CONSTITUTION:When a leader line such as a gas pipe 14 is automatically prepared, at first rectangular areas 11 to 13 for leader line where at least part of the boundary line segment 15 such as the road boundary of the road where this gas pipe, etc., is installed are defined as reference sides 11' to 13' are successively set so that the areas may not be overlapped with a margin polygon area 10 expect roads. Next, the already inputted start points A to A'' of each leader line are corresponded to the reference sides which are the nearest to each start point, for instance, and each reference side is divided based on this corresponded number. The intermediate points B to B'' and the start points A to A'' obtained by this division are combined in a form that the line segments with each other between the both points do not cross. Every area 11 to 13 for leader line, terminating points C to C'' are set at the prescribed direction from the intermediate points B to B''. Explanatory information guide parts BC, B' C', B'' C'' are made to be parallel lines, for instance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic lead line creation method, and more particularly to a road record indicating the position of a road, a facility record indicating the position of various facilities such as gas pipes, water pipes, cables, and the like. A leader record indicating the start point of the leader line is stored in at least the file device, and a lead line based on the leader record is created in the facility map specified by the road record and the facility record by running the application program. To a computer mapping system as described above.

[0002] Generally, by running an application program, a drawing (hereinafter referred to as a facility management chart) showing various facilities such as a water pipe, a power pipe, and a gas pipe installed on the road based on various input data is provided. Is created and updated, and the drawing lines for each of the graphic elements (line segments, arcs, etc.) representing these facilities are set, and the description information, such as the type and diameter of the gas pipe, is written in characters and Filling out using numbers and symbols is performed.

[0003] The facility data and the leader line data at this time are individually input on a common road drawing (road ledger map, etc.) by each public enterprise which is the manager of each facility. A road management system is constructed by converting these input data into a database.

Here, the facility data is input in a form that matches the occupation status of the facility at the site, while the lead line data is input in any form by the facility manager, ie, The information is entered without actively considering the mutual positional relationship with the leaders of other facilities occupying the same road section.

For this reason, in a region where a large number of leader lines are concentrated in the facility control chart, the leader lines and the explanatory information described therein are often complicated and difficult to see.
There is a demand for reliably providing a facility control chart in which each of the leader line and the explanation information is filled without being complicated, and the leader line automatic creation system of the present invention responds to this.

[0006]

2. Description of the Related Art FIG. 13 is an explanatory view showing an outline of hardware when a general computer is used to create and update a facility management chart by using a computer, 41 is a host computer, 42 is a road record and the like. Is a large-capacity disk external storage device, 43 is a storage area 44 of an application program for creating / updating a facility management diagram and a leader line,
A disk external storage device having a work area 45; 46, an input unit for inputting a drawing number of a mesh described later; 47, a digitizer for inputting road data, facility data, and leader data; A display unit for confirming the input state of the plotter and the contents of the created drawing, etc., and 49 indicates a plotter for outputting the created drawing and the like.

[0007] The output of the facility management chart is, for example, as shown in FIG. 14. At this time, the database of the disk external storage device 41 includes: a gas pipe 52, a water pipe 53, a sewage pipe 54, and a power pipe 55. Records that individually indicate the location and description information (such as pipe type and inner diameter) ・ Road records that indicate the locations of road boundaries 51 and 56 ・ Leader records are included (see FIGS. 15 and 16) ).

Further, since the area for constructing the database of such a facility control chart covers a wide area, this area is usually divided into a number of rectangular meshes (unit areas) and this is divided into a single sheet. , For example, scale 1 /
If 500 road ledger maps are used, east-west 500m, north-south 35
A mesh consisting of an area of 0 m is shown in a drawing having a size of 100 cm × 70 cm.

Here, the database of the disk external storage device 42 is constructed in such a manner that the drawing number of each mesh is used as a search key, and the format of the facility record, road record, and leader line record constituting the database is shown in FIG.
As shown in FIG. 15 and FIG. 16, it is composed of header sections 61 to 63 and coordinate data sections 64 to 66.

[0010] In addition to the record number, the header sections 61 to 63 include, for example, for a gas pipe, explanatory information including pressure, pipe material, pipe diameter, and length of the pipe represented by this record. For the leader line, the rotation angle θ of the explanation information, the size of the character / symbol to be described (hereinafter simply referred to as “character”), and the number of description steps are included.

Further, coordinate data representing the positions of characteristic points (connection points) of the respective graphic elements and data representing the number of the coordinate data are input to the coordinate data units 64-66. .
The characteristic point of a graphic element is, for example, an end point (connection point) of each line segment in the case of a graphic element expressed by a line segment sequence, and a positive integer value is used for the coordinate data. I have.

[0012] Then, "-1,
"0" indicates that the graphic element has ended at the preceding feature point, and the numerical value in each coordinate data is not a dimension on the drawing but a local value.

The lead wire 67 is connected to the lead-out section 68 between AB and B.
And the description information guide section 69 between the C and C. The setting of the coordinate data section 66 in the leader line record is performed on the facility control chart pasted on the digitizer 27 on the three points A and B with respect to the line segment 70 to be extracted. , C and inputting respective coordinate data.

A method for associating the leader line record with the facility record of the line segment including the point A, ie, the line including the point A is as follows. The record number of the leader line record is the same as the record number of the facility record. Are linked to each other in advance. ・ In the leader line creation processing, the facility record having the line segment closest to the point A is determined using the facility record group in the work area 45 and the coordinate data of the point A. A method such as finding is used.

Next, the outline of the leader line creation processing is as shown in FIG. Note that the former link method is used for the association. That is, 'designate the drawing number of the mesh to be created. Using the drawing number as a key, the facility record group, road record group, and leader record group of the mesh are taken out from the external storage device 42 and developed in the work area 45. 'Take out the coordinate data sections 64 to 65 of all developed facility records and road records, attach them to the standard line type code, and transfer them to the plotter 49. 'Coordinate data part of all expanded leader records
Take out 66 and attach them to the standard line type code and transfer them to plotter 49. 'For each leader record, a facility record having the same record number as that of the leader record is searched, and the description information (such as the type and inner diameter of the pipe) of the header part 61 is taken out. Plotter 49 with θ
(See FIG. 17). By such a procedure, the plotter 49 has acquired various data necessary for creating a leader line.

Since various characters used when outputting explanatory information on the plotter 49 are processed in the form of vector data, the rotation of the character by θ alone can be performed by a simple operation. .

[0017]

As described above, in the conventional automatic leader line creation method, when setting the leader lines of a plurality of facilities (lines indicating gas pipes, electric power pipes, and the like), the neighboring leader lines are not connected to each other. No consideration is given to the spacing between the lines and the degree of overlap, so in areas where the leader lines are concentrated, the leader lines and the characters written on them are intricate with each other, making it difficult to see the leader lines on the display screen and output drawings. There was a problem.

Therefore, in the present invention, each of the leaders to be arranged is set in a well-balanced manner in the leader control area set in the margin area other than the road in the facility control map, so that each leader is set in a well-balanced manner. An object of the present invention is to provide a simplified display of a leader line by eliminating complication between lines and explanatory information entered therein.

[0019]

SUMMARY OF THE INVENTION The present invention relates to a facility management chart for representing a location such as a road boundary and a location of a facility such as a gas pipe and a water pipe installed therein. After determining the margin polygon area composed of the boundary line segments, a leader line region having at least a part of the boundary line segment as a reference side is set inside the polygon polygon region so that each of the regions does not overlap. The reference side is divided based on the number of leader lines created in the leader line area, and an explanation information guide section from each division point (intermediate point) to the end point is set in a predetermined mutual relation, for example, Are set in a parallel state.

FIG. 1 is a diagram showing the basic configuration of the present invention. In the figure, reference numeral 1 denotes a part of a facility management chart, which is a start point A-intermediate point B-end point C, and a start point A'-intermediate point B'-end point, which are lead lines from facilities such as gas pipes and water pipes. C ′, starting point A ″ −intermediate point B ″ −end point C ″ are shown. Reference numeral 2 denotes a file device, which is a road indicating the position of a boundary line 15 such as a road boundary or a gutter. A record, a facility record indicating the position of the facility 14 installed on the road, and a leader record indicating the start point, intermediate point, and end point of the leader are stored in mesh units, respectively. A facility map of a target mesh is output based on various data taken out from the file device 2, and a process of creating a predetermined leader line is performed therein. Yes, early in the leader creation process In the stage, each starting point A of each leader line,
A ′, A ″,... And one of the reference sides 11 ′, 12 ′, 13 ′,. .

The reference sides 11 ', 12', 13 '...
The rectangular areas 11, 12, 13,... For leader lines set in the margin polygon area 10 determined by a plurality of continuous boundary line segments 15.
And on the boundary 15.

Next, the processing procedure for creating a leader line in the application program 3 is as follows. That is, the margin polygon area 10 is determined based on the road record group of the processing target mesh, and the lead-out rectangular areas 11, 12, and 13 including at least a part of the boundary line and having a height of a predetermined length L. .. Are set for each blank polygon area 10 so that the leader line rectangular areas do not overlap with each other. At this time, each of the lead-out rectangular regions 11, 12, 13,...
Are specified in the work area. The reference side vector data specifying the reference sides 11 ', 12', 13 ',. By using the reference side vector data and the leader line record group of the processing target mesh, the reference sides 11 ', 12', and 13 'are provided for each of the start points A, A', A ",.
.. Are selected at a short distance from the starting point, and the combination of both is stored in the reference side correspondence table 4. Referring to the reference side correspondence table 4, each reference side 11 ',
The number of start points assigned to 12 ', 13',... Is determined, and this number of intermediate points (divided points) is set at predetermined intervals on each reference side. In accordance with the arrangement order of the intermediate points on each reference side (for example, clockwise of the closed loop forming the leader line rectangular area), for each intermediate point (for example, B and B '), the reference side (for example, 1
1 ′), the angles (for example, θ ₁ , θ ₂ ) between the lines from the starting points (for example, A and A ′) to the intermediate point and the reference side are obtained in order, and the obtained angles are, for example, the maximum. (For example, the start point A for the intermediate point B) is selected. Any angle direction from each intermediate point B, B ', B "...
For example, the positions separated by a predetermined distance in the perpendicular direction are set as the end points C, C ′, C ″,... Corresponding to the respective intermediate points. Are automatically set.

Here, the value of L in the step is the maximum value k 'of the length of each of the explanatory information guides (BC), (B'-C'), (B "-C"). For “L ≧ k ′”
It is set in advance so that

Also, the lead-out rectangular areas 11, 12, 13,...
Is merely an example showing an area for creating a leader description information guide unit, and an area other than a rectangle may be set according to the shape of the margin polygon area 10.

When the reference side is selected in the step, for example, the shortest distance from the starting point to each reference side is determined to check the absolute value and the magnitude relation. However, the reference side having the minimum value is necessarily determined. No need to choose,
Any one of the reference sides whose absolute value falls within a predetermined range may be selected. In addition, it is desirable that the reference side, from which the line segment from the starting point passes through the blank polygon area, is not selected.

The setting of the intervals in the steps is arbitrary, such as, for example, equal division or non-uniform division in consideration of the difference in the number of steps of characters described in the explanation information guide section of each leader line corresponding to the reference side. Is used. Furthermore, as described later, when a part of a character (description information) overlaps with the adjacent leader line and a part of the character (description information) overlaps, a part of the starting point is removed from the target of the leader line creation process. Alternatively, a sufficient lead line interval may be obtained by setting an intermediate point only for the remaining predetermined number of start points.

Also, by selecting the starting point in the step,
The start point and the intermediate point, which are the end points of the leader line derivation unit, are determined in pairs, and the length of the explanation information guide unit from this intermediate point is also the leader record of the start point and the facility record corresponding to the start point. It is specified based on.

The end points C, C ',
The setting of C ″... May be in any mode such that the explanation information guide sections from the intermediate point to the end point do not intersect and the characters described there are not difficult to see.

[0029]

According to the present invention, the gas pipe of the facility control chart
When automatically creating a lead line such as a water pipe, first, a lead line area that has at least a part of the boundary line such as the road boundary or gutter of the road where this gas pipe etc. is installed as a reference side is the area other than the road. Set sequentially in the margin polygon area, and then associate the starting point of each preset lead line with, for example, the closest reference side from each, and divide each reference side based on the corresponding number. Each of the obtained intermediate points and each of the start points are combined in a one-to-one manner so that the line segments between the two do not intersect.

Then, the end point of the explanation information guide section is set at a position in a predetermined direction from each of the intermediate points assigned to each of the leader line areas, for example, so that the explanation information guide sections become parallel lines. ing.

That is, the reference side of each leader line area set without overlapping with the so-called block other than the road is divided by the number of leader lines in charge thereat, and an intermediate point in the leader line area is obtained. , For each of these intermediate points,
Sequentially, by selecting the optimal one from among the start points in charge of the leader line area and setting the end point in a predetermined direction, the lead lines of the start point-intermediate point-end point do not cross each other, The characters described in each of the explanation information guide sections do not become complicated.

[0032]

An embodiment of the present invention will be described with reference to FIGS. In the following embodiments, for convenience of explanation, it is assumed that an explanation information guide section orthogonal to the reference side is automatically created in a rectangular area for a leader line, and that each format of a road record, a facility record, and a leader line record is used. As for the hardware, the same hardware as the conventional one is used.

FIGS. 2 and 3 are explanatory diagrams showing a procedure for setting a lead line rectangular area. (1) Enter the drawing number of the mesh to be processed from the input unit 46 or the digitizer 47 having a menu input function. To the next step. (See FIG. 4). (2) Using this drawing number as a search key, a road record group of the mesh to be processed is extracted from the external storage device 42 and is developed in the work area 45, and the process proceeds to the next step. (3) Based on this road record group, each of the blocks (margin polygon areas) that are margins other than roads is determined in a vector data format, and the polygon data (polygon data) is developed in the work area 45. Proceed to the next step. (4) It is determined whether or not processing has been completed for all polygon data expanded in the work area 45, that is, for all margin polygon areas.
The process proceeds to the explanation information guide section creation process of step S3. If "NO", the process proceeds to the next step. (5) The entire margin polygon area specified by the polygon data to be processed next is stored as a “basic polygon area”, and the process proceeds to the next step (see FIG. 4). (6) By using the polygon data, the length of each side constituting the basic polygon area is calculated, and the process proceeds to the next step. (7) It is determined whether or not the display rectangular area creation processing for each side has been completed, and if “YES”, the step (4) is performed.
Return to "NO" and proceed to the next step if "NO". (8) Extract the vector data of the longest side among the unprocessed sides, and proceed to the next step. (9) An initial rectangular area 16 having this side as one side and a height of a predetermined length L is set in the basic polygon area, and the process proceeds to the next step (see FIG. 4). The value of L satisfies “L ≧ k ′” with respect to the maximum value k ′ of the length of the explanation information guide section of each leader line created in the blank polygon area, and is given, for example, in the program. Can be (10) An operation for calculating the product (overlapping portion) of the initial rectangular area 16 and the basic polygon area is performed, the overlapping portion is stored as a product polygon area 17, and the process proceeds to the next step (FIG. 4).
reference). (11) The maximum leader rectangular area 18 inscribed in the product polygon area 17 is set (see FIG. 4). (12) It is determined whether or not the value of L is secured as the height of the leader line rectangular area 18. If "YES", the process proceeds to the next step. If "NO", the process proceeds to the next step. Return to step (7) as processing completed. (13) The vector data is stored in the work area 45 as the base side 19 of the base of the leader line rectangular area 18, that is, the part common to the side of the basic polygon area, and the process proceeds to the next step (see FIG. 4). ). (14) Save the part obtained by subtracting the leader line rectangular area 18 from the basic polygon area as a new `` basic polygon area '',
Return to step (7). According to such a procedure, each of the display rectangular areas which do not overlap each other is specified by the vector data.

FIG. 4 is an explanatory view showing how a leader rectangular area having a predetermined height L is set as a blank polygon area. FIG. 5 is a view showing a leader rectangle having a predetermined height L. FIG. 10 is an explanatory diagram showing a state where an area cannot be set as a blank polygon area, where 10 and 10 ′ are initial blank polygon areas, 16 and 16 ′ are initial rectangular areas, 17 is a product polygon area, and 18 is a drawing polygon area. A line rectangular area, reference numeral 19 indicates a reference side, and reference numeral 20 indicates a maximum rectangular area inscribed in a product polygon area which is the same part as the blank polygon area 10 '.

Here, the vector data representing the reference side 19 of the rectangular area 18 for the leader line set in the product polygon area 17 in FIG. It is stored in the work area 45 as an end point.
The height L 'of the product polygon area in FIG. 5 is "L'<L".
Therefore, a predetermined rectangular area for a leader line is not set therein.

FIG. 6 is an explanatory diagram showing a state in which a leader rectangular area is set in an arbitrary margin polygon area in the order of the length of each side. In the margin polygon area shown in FIG. Is set to the rectangular area for the leader line, and in the margin polygon area of (b), only the three sides of "GH", "H-1" and "KG" are drawn out of the five sides. A line rectangular area is set.

FIGS. 7 and 8 are explanatory views showing the procedure of a leader line creation process performed after the setting of the leader line rectangular area. Here, as necessary, the reference side 19 in FIG.
The intermediate points (division points) 21 to 23, the start points 24 to 26 of the leader lines, and the like will be used as examples.

First, a process of allocating the start point of each leader line to which reference side is performed. The procedure is as follows: (21) A leader line record group and a facility record group of a processing target mesh are set using a drawing number as a search key. It is taken out from the external storage device 42 and developed in the work area 45, and proceeds to the next step. (22) It is determined whether or not the process of storing the correspondence between the start points of all the leader lines and the reference side in the reference side correspondence table has been completed.If “YES”, the process proceeds to step (25), and If so, proceed to the next step. (23) The next leader line record to be processed is extracted, and the process proceeds to the next step. (24) The shortest distance from the start point specified by this leader line record to each reference side is obtained in order, and the reference side having the shortest distance minimum is selected, and the combination of the start point and the reference side is set in the work area 45. In the reference side correspondence table of step 2
Return to 2) (see FIG. 10). It has become.

Next, a process of setting an intermediate point and an end point corresponding to each start point is performed for each reference side. The procedure is as follows: (25) Leader line creation processing for all reference sides, ie, each reference side It is determined whether or not the process of creating a leader line that starts from each of the start points associated with is completed.
In the case of "YES", the process ends, and in the case of "NO", the process proceeds to the next step. (26) The vector data of the next processing target, for example, the reference side 19 is extracted from the work area 45 in which the vector data is stored by the processing shown in FIGS. 2 and 3, and the process proceeds to the next step. (27) Referring to the reference side correspondence table, all leader records (starting points 24-2
The overlay number and record number of 6) are obtained, and the process proceeds to the next step. The overlay number is a facility type number for identifying each facility record group. (28) Intermediate point 21, which is the number of division points equal to the number of start points 24-26,
22 and 23 are set on the reference side 19 at, for example, equal intervals,
Proceed to the next step. (29) It is determined whether or not the corresponding start point selection processing has been completed for all of the intermediate points 21, 22, and 23.If "YES", the process returns to the step (25) .If "NO", the process proceeds to the next step. move on. (30) Only one intermediate point (first the intermediate point 21) is taken out in the vector direction (arrow direction) of the reference side 19, and the process proceeds to the next step. (31) Each of the lines connecting the points that have not yet been associated with the intermediate point among the start points 24-26 and the intermediate points extracted in the previous step (the lines 27-29 at first) and the reference side 19 (Initially θ ₁ to θ ₃ ) are obtained in order, and the process proceeds to the next step. In calculating the angle, the cosine theorem of a triangle specified by three points, the starting point, the intermediate point, and the end point E of the reference side, for which the respective coordinate data is known, is used. (32) The starting point where the angle is the maximum and its intermediate point (the starting point is
And the intermediate point 21), calculate the length k from the intermediate point to the end point, store it in the reference side correspondence table, and proceed to the next step (see FIG. 10). When calculating the length k, data such as the width of one character and the number of characters are obtained by referring to the leader record at the start point and the facility record corresponding to the leader line record. (33) k which is the length of the explanation information guide section 69 from the intermediate point,
The coordinate data of the end point C of the explanation information guide section is obtained using the inclination θ and the like, and the process proceeds to the next step (see FIG. 10). The set angle of the explanation information guide unit 69 with respect to the reference side 19 is given in advance in, for example, a program. (34) The coordinate data of the intermediate point and the end point are returned to the work area 45 as the coordinate data of the second point and the third point in the leader record of the start point, and the process returns to the step (29). It has become.

FIG. 11 is an explanatory diagram showing leader lines automatically created by such a series of procedures and explanatory information described therein, as compared with a conventional leader line drawing (see FIG. 14). It is easy to see.

Next, FIG. 12 is an explanatory diagram showing a state in which a point moved inside by a predetermined length β from the division point of the reference side is used as an intermediate point of the leader line. At this time, by using “L + β” instead of the predetermined length “L” in the step (9), a rectangular area for a leader line having a height of (L + β) is used.
18 'is set and the coordinates of each of the intermediate points G', H 'and I' are calculated using the equations shown.

It is needless to say that the angle between the explanation information guide section 69 and the reference side 19 may be set to an arbitrary value. In this case, the value of "L" or "β" in the step (9) is used. As the value, a value obtained by multiplying the value at 90 degrees by the sine value of an arbitrary angle is used.

In the step (28), when the distance w between the adjacent intermediate points is smaller than a predetermined value, for example, the sum of the height of the character described on the leader line and the constant, Processing is performed such that the number of start points assigned to the reference side is reduced by a predetermined number and the previous magnitude relationship is reversed.

Then, the coordinate data of the intermediate point and the end point calculated in the form corresponding to the start point of each leader line are stored in the external storage device 42 as the coordinate data of the second point and the third point of the leader line record, respectively. In addition, the data is sent to the plotter 49 or the like together with the coordinate data of the starting point specified in advance, and the drawing of the drawing with the leader lines is performed.

[0045]

As described above, according to the present invention, the lead line area is first set so as not to overlap with each polygon area which is a blank part other than the road in the facility map, and then each of the public enterprises is individually input. Each of the specified start points is assigned to a nearby leader line area, and then, for each leader line area, its reference side is divided by the number of assigned start points, and the leader lines intersect based on this division point. Because the starting point and the intermediate point corresponding to each starting point are set so that there is no drawing, it is possible to provide a facility map where the leader lines do not intersect and the explanatory information entered there is not complicated. it can.

[Brief description of the drawings]

FIG. 1 is a basic explanatory diagram of the present invention.

FIG. 2 is an explanatory diagram (part 1) illustrating a procedure for setting a leader line rectangular area according to the present invention;

FIG. 3 is an explanatory view (No. 2) showing the procedure for setting a leader line rectangular area according to the present invention;

FIG. 4 is an explanatory diagram showing how a rectangular area for a leader line having a predetermined height L is set as a margin polygon area according to the present invention.

FIG. 5 is an explanatory diagram illustrating a state where a rectangular area for a leader line having a predetermined height L cannot be set as a blank polygon area according to the present invention.

FIG. 6 is an explanatory diagram showing a state in which a rectangular area for a leader line is set in an arbitrary polygon area according to the order of the length of each side according to the present invention.

FIG. 7 is an explanatory diagram (No. 1) illustrating a procedure of a leader line creation process according to the present invention.

FIG. 8 is an explanatory view (No. 2) illustrating a procedure of a leader line creation process according to the present invention.

FIG. 9 is an explanatory diagram showing correspondence between a starting point and an intermediate point according to the present invention;

FIG. 10 is an explanatory diagram showing a reference side correspondence table and the like according to the present invention.

FIG. 11 is an explanatory diagram illustrating an output example of a leader line portion according to the present invention.

FIG. 12 is an explanatory diagram illustrating a state in which a point moved inside by a predetermined length β from a division point on a reference side is used as an intermediate point according to the present invention;

FIG. 13 is an explanatory diagram showing an outline of hardware when a general computer is used to create and update a facility management chart using a computer.

FIG. 14 is an explanatory diagram showing a conventional output example of a facility management chart.

FIG. 15 is an explanatory diagram showing a format of a general facility record.

FIG. 16 is an explanatory diagram showing a general format of a road record and a leader record.

FIG. 17 is a flowchart showing an outline of a conventional leader line creation process.

FIG. 18 is an explanatory diagram showing a general positional relationship between a leader line and explanatory information entered therein.

[Explanation of symbols]

 In FIG. 1, 1 ... a part of the facility management chart 2 ... external storage device 3 ... application program 4 ... reference side correspondence table

Continuation of the front page (56) References JP-A-6-282593 (JP, A) JP-A-5-61927 (JP, A) JP-A-4-88560 (JP, A) Higashiaki Sakura, map information database system , Information Processing, Japan, Information Processing Society of Japan, May 15, 1992, Vol. 33 / No. 5, 486-496 Kazumi Tanaka, Map Information System: Personal Computer, Popularized on EWS, Nikkei CG, Japan, Nikkei BP, October 31, 1989, October 1989, 139-150 (58) Fields investigated (Int. Cl. ⁷ , DB name) G06F 17/50 JICST file (JOIS)

Claims (5)

(57) [Claims] 1. A file device comprising at least a road record indicating a position of a road, a facility record indicating a position of various facilities such as a gas pipe, a water pipe and a cable, and a leader record indicating a starting point of a leader for these various facilities. In the computer mapping system stored in the road and the facility map specified by the facility record by the running of the application program to create a leader line based on the leader line record, the application program, Based on the road record, a blank polygon area composed of continuous boundary lines is determined, and a leader line area including at least a part of the boundary line and having a height of a predetermined length in a direction perpendicular to the boundary polygon area is respectively determined. Are formed in the margin polygon area so that they do not overlap By using reference line vector data indicating a reference side which is a common part between the boundary line segment and the side of the leader line area, and the leader line record, a reference side closer to each of the start points is obtained. Each combination of the two is stored in the reference side correspondence table, and all the starting points assigned to the reference side to be processed are obtained with reference to the reference side correspondence table. For a predetermined number of the starting points, A method for automatically creating a leader line, wherein an intermediate point and an end point for specifying each leader line are set in the leader line area having the reference side so that the leader lines do not cross each other. 2. The leader line automatic creation method according to claim 1, wherein the leader line area is formed in order from the longest side of the margin polygon area. 3. When the intermediate point and the end point are set, the reference side is divided in a form corresponding to the predetermined number by using the predetermined number of the start points and the reference side vector data, and based on the division point. 3. The leader line automatic creation method according to claim 1, wherein each of the intermediate points is determined by the following method. 4. When deciding each of the intermediate points, for each of the division points, a line connecting the start point and the division point for which the corresponding intermediate point has not yet been identified, 4. The automatic leader line creation method according to claim 3, wherein an angle with respect to the reference side is calculated, and the magnitude relation of the angle is used. 5. A leader line automatic creation method according to claim 1, wherein a rectangular area is used as the leader line area.