KR20100117986A - Method for measuring the location similarity of spatial object on digital maps and map matching using the same - Google Patents

Abstract

PURPOSE: A method for measuring the location similarity of a spatial object on digital maps, and a map matching method using the same are provided to match identical objects on different kinds of digital maps by using the location similarity which specifies the relationship of peripheral objects of the spatial object. CONSTITUTION: A reference object is selected on a reference digital map, and a coordinate value of a spatial object is obtained(100). A buffer distanced from the coordinate value at a certain interval is generated in the reference digital map, and the spatial object included in a certain range is extracted. The buffers identical to each other based on the identical coordinate value are generated on a comparison target digital map, and the spatial object included in a certain range is extracted(200). The landmarks which are the plural spatial objects having the identical information are selected primarily as a corresponding object by comparing the intrinsic information of the spatial object extracted from two digital maps(300).

Description

{Method for Measuring the Location Similarity of Spatial Object on Digital Maps and Map Matching using the same}

The present invention relates to a method for measuring the position similarity of a spatial object on a digital map and a map matching method using the same. More specifically, to establish a new standard and method for measuring the position similarity of a spatial object on a digital map, different numerical map By establishing procedures and criteria when performing target object matching using positional similarity comparison in the matching of the two or more, preprocessing operations such as the same coordinate system conversion or the format unification, which are required in the prior art, are not required. The present invention relates to a method of measuring a position similarity of a spatial object on a digital map and a map matching method using the same.

In general, digital maps are the core data that make up the Geographic Information System and Location Based Service, where digital maps refer to the locations, topography, geographical features and geographical names of the surface, underground, underwater and space. Various geospatial information such as the digital representation of a certain scale by using a computer system.

Such digital maps are widely used in geographic information-related tasks throughout the society, and the demand for various digital data is increasing rapidly. As the interest of digital maps expands, users' needs are increased and satisfied users are satisfied. The production of digital maps is expected.

In addition, since many digital maps that have been constructed do not contain the information required by the user because they are produced for different purposes and periods, new production of new digital maps has increased rapidly in different institutions to satisfy user needs.

Conventionally, for the creation of user-oriented digital maps, a map containing new information that is more useful is created by matching between digital maps containing different levels of information, which is the process of recognizing and linking the same spatial object in each map. In the prior art, the same object was recognized using geometric information such as superposition analysis. In other words, if the coordinates of the two maps are the same and output on the same computer screen, the objects in the same position in the real world are completely overlapped or have high overlapping degree. Match using object shape similarity.

However, two different map formats differ in geometric information for the corresponding object. For example, if the organization of the digital map is different, it will have a different shape depending on how accurate the spatial object of the real world is represented.If the timing is different, the shape or form of the spatial object may be updated over time. If you have different information and many spatial objects of the same shape exist in the same location, such as an apartment complex, it is difficult to accurately match the same object object unless you perform sophisticated distortion correction in adjusting the coordinate system.

Therefore, the conventional technology has a problem in that when the coordinates, shapes, and shape information of the spatial objects are different, the same spatial objects are not recognized in the two maps, and a manual work is required, thus requiring a lot of time and cost for map matching.

The present invention has been devised to solve the above problems, and an object of the present invention is a position similarity diagram characterized by a relationship with surrounding objects of an arbitrary spatial object, not geometric information, as a criterion for matching different numerical maps. Is to graph and provide a way to measure it.

Another object of the present invention is to provide a map matching method using a position similarity measuring method, which enables the same object matching of two different digital map types by using a position similarity characterizing a relation of surrounding objects of an arbitrary spatial object. There is.

In order to achieve the above object, the present invention comprises the steps of (a) extracting the landmark by measuring the semantic similarity of the attribute information for the spatial object in the search range of the two different digital map; (b) measuring the position similarity between the reference object and the candidate object group by using the landmark.

In addition, the step (a), (c) selecting a reference object to be matched in the reference numerical map and then selecting a reference object in the reference numerical map for obtaining coordinate values of the corresponding spatial object; (d) Create a buffer of a certain distance from the reference numerical map based on the coordinate values obtained in step (c) to extract the spatial objects included in the range, and the same coordinate values in the comparison target numerical map as well. Extracting the spatial objects included in the range by creating the same buffer around the same; and (e) lands having a plurality of spatial objects having the same information by comparing the attribute information of the spatial objects extracted from the two numerical maps, respectively. Characterized in that it comprises a landmark extraction step of first selecting the mark as the corresponding object,

The step (b) comprises the steps of: (f) generating a Voronoi diagram that includes a unique landmark in each map with a plurality of landmarks selected in the step (a); (g) Selecting a Voronoi polygon containing the landmark of the Voronoi polygon on which the reference object of the reference digital map is located is selected from the numerical map to be compared, and matching the candidate candidate by analyzing the overlap between the selected Voronoi polygon and the numerical map to be compared. Is limited to some spatial objects included in the selected Voronoi polygon from all spatial objects included in the buffer region of the comparison numerical map; (h) constructing a reference triangle network between the reference object and a plurality of landmarks in adjacent positions on the reference numerical map; (i) forming a candidate triangle network as many as the number of candidate objects by connecting to the same landmark selected in the reference triangle network and the candidate object in step (g), and (j) a reference composed of a plurality of individual triangles Computing the respective triangular area and the circumferential length of the triangular network and the candidate triangular network respectively, and measuring the position similarity of the triangular network using the area ratio and the circumferential ratio.

As described above, the present inventors measure the position similarity of the spatial objects on the digital map and map matching method using the same, establish a new standard and method for measuring the position similarity of the spatial objects on the digital map, By establishing procedures and criteria when performing target object matching using the comparison of position similarity, it is possible to reduce the time and cost of the work by eliminating the need for preprocessing operations such as transforming the same coordinate system or format unification, which were required in the prior art. There is.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention configured as described above are as follows.

1 is a diagram showing a spatial relationship between two different spatial objects in a graph, Figure 2 is a configuration diagram showing a method of measuring the position similarity of a spatial object on a digital map according to the present invention and a map matching method using the same, Figure 3 Is a flowchart illustrating a method for measuring position similarity of a spatial object on a digital map according to the present invention and a map matching method using the same, FIG. 4A is an exemplary diagram for selecting a landmark using a Voronoi diagram, and FIG. 4B is a Voronoi diagram. 4C is an exemplary diagram illustrating a spatial relationship between a reference object and surrounding landmarks in a triangular network, and FIG. 5 is an exemplary diagram of a reference triangular network and a candidate triangular network. FIG. 6 is a flowchart illustrating a method of measuring position similarity of two spatial objects, and FIG. 7 is a sequence of determining corresponding matching objects in two different numerical maps. It is also.

FIG. 1 is a diagram showing information about a spatial relationship of a general spatial object with a peripheral object, that is, a phase relationship, distance, and direction for a common peripheral object. The spatial relationship expressed by the graph is different. In the present invention, the spatial relationship is measured as a position similarity and a map matching method using the same is proposed.

As shown in FIG. 2, the method proposed by the present invention measures the semantic similarity of attribute information for a spatial object within a search range of two different digital maps, and extracts the landmark (100) and the landmark. Measuring the position similarity between the reference object and the candidate object group using the step 200, and matching the spatial object having the highest position similarity through the comparison of the calculated position similarity (300).

2 will be described in detail as follows.

As shown in FIG. 3, the step 100 of measuring semantic similarity of attribute information of FIG. 2 includes selecting a reference object in a reference numerical map (S110); Spatial object extraction (S120); Including the landmark extraction (S130) step, and measuring the position similarity of FIG. 2 (200) includes: generating a Voronoi diagram (S210); Identifying a matching candidate group (S220); A reference triangle network S230 and a candidate triangle network configuration S240; A similarity measure (S250) of the triangular network is included, and the object matching step 300 by comparing the position similarity of FIG. 2 includes an object matching (S310) having the highest position similarity.

In the step of selecting a reference object in the reference numerical map (S110), the reference object to be matched is selected in the reference numerical map 10, and then coordinate values of the corresponding spatial object are acquired. Here, the reference object in the reference numerical map is selected as an object that is difficult to identify in the comparison target numerical map.

Next, in the step of extracting the spatial object (S120), a buffer of a predetermined distance is generated from the reference numerical map 10 based on the coordinate values obtained in the step S110 to extract a spatial object included in a range, Similarly, the comparison target digital map 20 generates the same buffer around the same coordinate value and extracts the spatial object included in the range.

Next, in the landmark extraction step (S130), a plurality of spatial objects having the same information are first selected as corresponding objects through comparison of attribute information of spatial objects extracted from two digital maps, respectively, and these are called landmarks. For example, in the case of building objects, objects with the same building name on both maps are selected as landmarks.

In the generating a Voronoi diagram (S210), a Voronoi diagram is generated from each map with a plurality of landmarks selected in the step S130. Here, the polygons constituting the Voronoi diagram are each generated by including unique landmarks, and serve to distinguish a certain area on the map, and the method of generating the Voronoi diagram is a conventional method, and thus detailed description thereof is omitted. In this step, the Voronoi polygon containing the reference object of the matching selected from the reference numerical map can be identified, and the landmark that has the greatest influence on any spatial object can be obtained through the adjacent polygon.

An embodiment thereof is illustrated in FIG. 4A. FIG. 4A is an exemplary view illustrating a landmark selection that most influences an arbitrary spatial object using a Voronoi diagram. As shown, a Voronoi polygon in which a reference object is located is diagonally formed. In the drawing, a plurality of landmarks included by the polygon and the adjacent polygon are connected to the reference object by a solid line.

Next, in the step of identifying the matching candidate group (S220), the landmarks of the Voronoi polygons in which the reference object is located are identified, and the Voronoi polygons including the corresponding landmarks are selected from the comparison target numerical map. Through the overlapping analysis between the selected Voronoi polygon and the comparison target digital map, the matching candidate object is limited to some spatial objects included in the selected Voronoi polygon among all the spatial objects included in the buffer region of the comparison target digital map.

An embodiment thereof is illustrated in FIG. 4B, which illustrates an example of defining matching candidate objects in a comparison target numerical map using a Voronoi polygon. As illustrated, a borough including a corresponding landmark in the comparison target numerical map is illustrated. The noise polygon is shown as an oblique line, and the overlapping analysis shows that the selected spatial object is a point as a matching candidate. For reference, the spatial object not shown as a point in the Voronoi polygon shown by the diagonal line is a landmark, and the landmark is excluded from the matching candidate object.

Next, in the step of constructing the reference triangle network (S230), the reference triangle network is constructed between the reference object and a plurality of landmarks located at the position surrounding the reference numerical map.

An embodiment thereof is illustrated in FIG. 4C. FIG. 4C is an exemplary diagram in which a spatial relationship between a reference object and surrounding landmarks is represented by a triangular network on a reference numerical map. As shown in the drawing, the reference object is connected to a plurality of landmarks. The triangular net was constructed.

Subsequently, in the candidate triangular network configuration (S240), the candidate triangular network forms a triangular network by connecting the same landmark selected when the reference triangular network is configured and the candidate object shown as a dot in FIG. 4B. If there are a plurality of candidate objects, as many candidate triangle networks as the number of candidate objects are generated.

Subsequently, the reference triangular network is composed of a plurality of individual triangles, and the candidate group triangular network is also composed of a plurality of individual triangles. In this case, in the step of measuring similarity of the triangular network (S250), the corresponding individual triangles of the two triangular networks are respectively. Calculate the area ratio and the peripheral ratio by calculating the area and the peripheral length. This is related to the position similarity proposed in the present invention.

An embodiment thereof is illustrated in FIG. 5. FIG. 5 is an exemplary diagram of a reference triangle network for an object of a reference digital map representing a spatial relationship of an object and a candidate triangle network for a candidate object of a comparison target digital map. .

6 is a flowchart illustrating a method of measuring position similarity of two spatial objects. This is a process of comparing the reference triangular network and one candidate triangular network, and repeats the comparison process with the reference triangular network for all the configured plurality of candidate triangular networks.

First, the number of landmarks located at positions surrounding the reference object in the reference numerical map is determined (S251). This is because the individual triangles of the triangle network are configured by the number n of landmarks, and all the individual triangles constituting the triangle network are compared.

Next, an area ratio (area of the i-th candidate triangle / area of the i-th reference triangle) is calculated for the corresponding individual triangles of the reference triangle network and the candidate triangle network (S252).

Subsequently, the square of two levis (circumference of the i th candidate triangle / circumference of the i th reference triangle) is calculated for the corresponding individual triangles of the reference triangle network and the candidate triangle network (S253).

Next, if the similarities of the two individual triangles are high, the values of the square of the area ratio and the perimeter ratio are the same. Accordingly, the calculated difference (| area ratio-squared ratio | circuit ratio |) is calculated and stored in the position similarity diagram of the individual triangle (S254).

Finally, the position similarity is calculated and accumulated for all the individual triangles constituting the triangular network (S255).

In the object matching step having the highest position similarity (S310), the calculated position similarity is compared to determine a candidate object having the highest position similarity as a matching pair with the reference object.

As shown in the flowchart of determining corresponding matching objects in two different numerical maps using the position similarity diagram of FIG. 7, when the position similarity is high, the calculated position similarity value is 0 or smaller than the similarity of other candidate objects. Have Therefore, the candidate object having the minimum value among the calculated values of the position similarity of the candidate triangular network is identified and determined as the final matching pair.

First, the position similarity of the first candidate object is set to a minimum value (S311).

Next, the position similarity of the second candidate object is called up (S312).

Next, the value stored in the minimum value is compared with the called position similarity (S313).

Next, if the called position similarity is smaller than the stored value, the minimum value is changed to the called value and the number of candidate objects stored as the minimum value is stored (S314).

Finally, the above process is repeated as many as the number of candidate groups (S315).

Since each of the steps of the present invention can be specifically implemented by means of computer technology in order that the information processing by software on a computer can be concretely realized using hardware, this means that those skilled in the art to which the present invention pertains. Although it can be derived directly by the above, in the above has shown and described a specific preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment, it is common knowledge in the art to which the present invention belongs Persons having the present invention may be variously changed without departing from the technical gist of the present invention.

1 is a diagram illustrating a spatial relationship between two different spatial objects.

2 is a block diagram showing a method of measuring the position similarity of a spatial object on a digital map according to the present invention and a map matching method using the same.

3 is a flowchart illustrating a method of measuring a position similarity of a spatial object on a digital map and a map matching method using the same according to the present invention.

4A is an illustration of landmark selection using a Voronoi diagram.

4B is an exemplary diagram for defining matching candidate objects using a Voronoi diagram.

4C is an exemplary diagram in which a spatial relationship between a reference object and a landmark around it is expressed by a triangular net;

5 is an exemplary diagram of a reference triangle network and a candidate triangle network.

6 is a flowchart illustrating a method of measuring position similarity of two spatial objects.

7 is a flowchart for determining a corresponding matching object in two different numerical maps.

Claims (5)

(a) extracting a landmark by measuring semantic similarity of attribute information for a spatial object within a search range of two different digital maps; and (b) measuring the position similarity between the reference object and the candidate object group using the landmark. The method of claim 1, Step (a) is, (c) selecting a reference object to be matched from the reference numerical map and selecting the reference object in the reference numerical map to obtain coordinate values of the corresponding spatial object; (d) Create a buffer of a certain distance from the reference numerical map based on the coordinate values obtained in step (c) to extract the spatial objects included in the range, and the same coordinate values in the comparison target numerical map as well. Extracting the spatial object included in the range by creating the same buffer around (e) a landmark extraction step of first selecting a plurality of landmarks that have the same information as corresponding objects by comparing attribute information of the spatial objects extracted from the two numerical maps as corresponding objects; How to measure the position similarity of spatial objects on the map. The method of claim 1, Step (b) is, (f) generating a Voronoi diagram each having a unique landmark in each map with a plurality of landmarks selected in step (a); (g) Selecting a Voronoi polygon containing the landmark of the Voronoi polygon on which the reference object of the reference digital map is located is selected from the numerical map to be compared, and matching the candidate candidate by analyzing the overlap between the selected Voronoi polygon and the numerical map to be compared. Is limited to some spatial objects included in the selected Voronoi polygon from all spatial objects included in the buffer region of the comparison numerical map; (h) constructing a reference triangle network between the reference object and a plurality of landmarks in adjacent positions on the reference numerical map; (i) forming a candidate triangle network as many as the number of candidate objects by connecting the same landmark selected in the reference triangle network and the candidate object in step (g); and (j) after calculating the respective triangular area and the perimeter length of each of the reference triangular network and the candidate triangular network consisting of a plurality of individual triangles, and measuring the position similarity of the triangular network using the area ratio and the perimeter ratio; Method for measuring the position similarity of the spatial object on the digital map, characterized in that. The method of claim 3, wherein Step (j) is, (k) identifying the number of landmarks in the position surrounding the reference object on the reference numerical map, the number of individual triangles constituting the triangle network to compare the reference triangle with one candidate triangle network; (l) calculating an area ratio (the area of the i th candidate triangle / the area of the i th reference triangle) for the corresponding individual triangles of the reference triangle network and one candidate triangle network; (m) calculating a square of the ratio (the circumference of the i th candidate triangle / the circumference of the i th reference triangle) for the reference triangle and the corresponding individual triangles of one candidate triangle network; (n) calculating the difference between the values calculated in steps (l) and (m) (| square of area-to-circle ratio |) and storing them in the position similarity of individual triangles; (o) calculating and accumulating and storing the position similarity by repeating steps (l) to (n) for all the triangles constituting the reference triangle network and one candidate triangle network; and (p) repeating the steps (l) to (o) for a plurality of candidate triangular networks. The method of claim 1, (q) matching the candidate object having the highest position similarity with the reference object by comparing the measured position similarity further comprising a map matching method using the position similarity measurement of the spatial object on the digital map .

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