JP2001175849A - Processing method for geographical information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geographical information processing method which eliminates trouble such as the absence of part of information when graphic information processed in plotting operation, etc., on general CAD software is incorporated in general GIS software and easily synchronizes geographical map data of a geographical map, etc., with old GIS data when the geographical map data are updated. SOLUTION: In this geographical information processing method which takes in CAD data with an added attribute layer modifying a graphical layer and displays facilities, etc., on a geographical map, the CAD data are a means for solving a method for generating the attribute layer so that a diagram or polygon crosses or includes objects of the graphic layer, taking in graphics or characters crossed or included by the diagram or polygon on the attribute layer for the graphic layer as the attribute into a database and processing them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing geographic information.

[0002]

2. Description of the Related Art In recent years, when a topographic map and equipment are displayed on the topographic map, a terrain information processing system (Geog) is used.
raphic Information System
The drawing work using the GIS) is mainly used.

[0003] Some existing general-purpose GIS software has a drawing function. However, work efficiency is poor, so that general-purpose CAD software is used for drawing work, and the created figure is converted by a conversion tool. After conversion, general-purpose GI
An attribute is added on the software for S side to associate with the map information.

[0003]

However, since the graphic information in the general-purpose GIS software and the general-purpose CAD software is different, even if converted by the conversion tool, a problem such as a partial loss of information may occur. there were.

FIG. 3 is an explanatory view showing an example of the above-mentioned problem.
The upper part of the figure shows the display state of a display or the like as a result of drawing processing by general-purpose CAD software, and the lower part is converted by a conversion tool and converted to a general-purpose GI.
This shows the display state on the display device as a result of taking in the software for S and performing the drawing processing.

More specifically, an example of a problem may occur in which graphic information subjected to broken-line processing by the general-purpose CAD software on the upper side is displayed as a straight line on the lower side, as shown by. In addition, the character information created by the general-purpose CAD software may be reduced from 80% in the horizontal direction to 100% in the lower side, as shown by a symbol.

[0006] When these inconveniences occur, it is practically impossible to perform the correction on general-purpose CAD software. Therefore, it is necessary to perform another correction operation on the general-purpose GIS software, which complicates the work process. It required extra man-hours.

[0007] Further, map data such as topographic maps are supplied to the market from many vendors.
It is common to create IS data, but on the other hand, since these topographic maps and other map data are updated regularly, any of these locations must be changed, such as added or deleted. It was necessary to determine whether it was an added location.

That is, it is necessary to determine the difference between the old topographic map data, which is the topographic map data of one generation before, and the new topographic map data that has been updated and newly supplied, and synchronize them with the old GIS data.

Therefore, the method of processing geographic information according to the present invention has been made in view of such problems, and the purpose of the method is to deal with graphic information processed by drawing work on general-purpose CAD software. Even if the data is imported into the general-purpose GIS software, there will be no problems such as partial loss of information, and even if the topographic map data such as topographic maps are updated, An object of the present invention is to provide a method for processing geographic information that can be synchronized with GIS data.

[0010]

In order to solve the above problems, a method for processing geographic information according to the present invention comprises:
CAD with attribute layer to modify figure layer
A method of processing geographical information for capturing data and displaying equipment or the like on a topographic map, wherein the CAD data includes the attribute layer so as to intersect or include the object of the graphic layer with a diagram or polygon. Is created, and a graphic or character intersected or included in the graphic layer by the diagram or polygon on the attribute layer is taken as a database as an attribute and processed.

By adopting such a method, even when graphic information processed by a drawing operation or the like on general-purpose CAD software is imported into general-purpose GIS software, a problem such as a partial loss of information is prevented. Since there is no need to perform the correction work on the general-purpose GIS software, the work process is simple and no extra man-hours are required.

As a method of processing the difference between the old topographic map data and the new topographic map data, the old topographic map data is read after defining the similarity between the old topographic map data and the new topographic map data. When an object consisting of the same coordinate points and attributes as the object of the old topographic map data exists in the new topographic map data, it is deleted from both the old topographic map data and the new topographic map data, and the old topographic map data and the new topographic map data are deleted. For each object in the topographic map data, calculate the ratio of the same coordinate point to all the coordinate points. Objects with a similarity ratio in the old topographic map data that are less than the similarity ratio are deleted, and objects that are less than the similarity ratio in the new topographic map data. Is an additional object, objects having a similarity ratio or higher in the old topographic map data are treated as objects before change, and objects having a similarity ratio or higher in the new topographic map data are processed as objects after change.

By using a method for processing the difference between the old topographic map data and the new topographic map data, even if the topographic map data such as a topographic map is updated, the old GIS data and the new GIS data can be easily converted. The synchronization can be performed, and the operation can be performed while confirming the information on a display device such as a display.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for processing geographic information according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of a method of importing graphic information processed by a drawing operation or the like on general-purpose CAD software into GIS software.

Many general-purpose CAD software often employs a DXF file format as a data format. However, in the geographic information processing method of the present invention, data in the DXF format is output in the same manner as when the data was created. , And those attributes are automatically associated with the topographic map data.

The processing method will be specifically described. First, topographic map data (topographic map layer) is displayed on a display device such as a display. Then, on the CAD software, an attribute layer is created so as to intersect or include the topographic map layer object with a line map or polygon, and the definition is made so as to modify the topographic map layer. Drawing is performed by intersecting or including a line map or polygon on the attribute layer with respect to the object to which the attribute of the topographic map layer is added. The attributes required for this drawing are entered in text. The above steps are repeated as necessary to create desired data, and the data is stored as data in the DXF format. Registration processing is performed on the topographic map layer as a database of the geographic information processing method according to the present invention for a figure or character that intersects or is included by looking at a line map or polygon on the attribute layer.

It is to be noted that by using a CAD software script or the like at the time of creating the attribute layer, an improvement in work efficiency can be expected.

Next, a method of processing the difference between the old topographic map data and the new topographic map data will be described with reference to FIG. First, the similarity ratio between the old topographic map data and the new topographic map data which is the topographic map data of one generation before is defined, and the old topographic map data is read. When an object consisting of the same coordinate points and attributes as the object of the old topographic map data exists in the new topographic map data, it is deleted from both the old topographic map data and the new topographic map data, and the old topographic map data and the new topographic map data are deleted. For each object in the topographic map data, calculate the ratio of the same coordinate point to all the coordinate points. Objects with a similarity ratio in the old topographic map data that are less than the similarity ratio are deleted, and objects that are less than the similarity ratio in the new topographic map data. Is an additional object, objects with similarity or higher in the old topographic map data are treated as objects before change, and objects with similarity or higher in new topographic map data are processed as objects after change.

[0020]

As described above, according to the geographic information processing method of the present invention, the following effects can be obtained. General-purpose CAD
Even when the graphic information processed by the drawing work on the software is taken into the general-purpose GIS software, there is no problem such as partial information missing, and the correction work is performed on the general-purpose GIS software. Since there is no need, the work process is simple and no extra man-hours are required. Further, even when the topographic map data such as the topographic map is updated, it is possible to easily synchronize with the old GIS data and to perform the work while confirming it on a display device such as a display.

[0021]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method of importing graphic information processed by a drawing operation or the like on general-purpose CAD software into GIS software in the method for processing geographic information according to the present invention.

FIG. 2 is an explanatory diagram of a method for processing a difference between old topographic map data and new topographic map data.

FIG. 3 is an explanatory diagram showing a conventional failure example.

Claims (1)

[Claims] 1. A method of processing geographic information for acquiring CAD data to which an attribute layer for modifying a graphic layer is added, and displaying equipment and the like on a topographic map, wherein the CAD data is an object of the graphic layer. Create the attribute layer so that it intersects or includes a line diagram or polygon with respect to the figure. A geographic information processing method characterized by taking in and processing.