A Joint Surveying and Mapping Graphic Element Data Conversion Method and System Based on Skeleton Line Transformation

Abstract

The present invention relates to a method and system for converting joint surveying and mapping primitive data based on skeleton line transformation. The method is based on the EPS platform. By defining the middle wall line, outer half wall line, and balcony edge line in the household division of building projects surveyed and mapped for real estate as skeleton lines, and then, based on the skeleton lines, through predefined transformation rules, the automatic transformation of real estate surveying and mapping primitive data into surveying and mapping primitives for planning condition verification is realized, reducing the workload of manual processing of spatial data and reducing the error rate. At the same time of the automatic transformation of primitives, the automatic mapping of the common attributes of related primitives is realized. The operator does not need to redefine the common attributes of the primitives, but only needs to supplement the newly added thematic attribute information after conversion, simplifying the operation process of the operator, reducing the operation complexity, and improving the operation efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of surveying and mapping geographic information technology, and particularly relates to a method and system for converting combined surveying and mapping graphic element data based on skeleton line transformation. Background Art

[0002] Regarding the Notice on Carrying out Pilot Reforms of the Project Construction Project Approval System, the document requires the implementation of combined on-site inspections, combined surveying and mapping, combined drawing review, combined acceptance, etc. For the surveying work involved in acceptance, the principle of "one-time commission, unified surveying and mapping, and result sharing" is implemented. The so-called combined surveying and mapping refers to the implementation of "one-time commission, combined surveying and mapping, and result sharing" for the planning condition verification surveying, civil air defense surveying, and real estate surveying involved in the completion acceptance stage of engineering construction projects such as housing construction and urban infrastructure in Guangdong Province (except for special projects and major projects in the fields of transportation, water conservancy, and energy).

[0003] The applicant has found that: Although the above document requires that combined surveying and mapping should generally measure the same subject only once, due to different business approval requirements of government functional departments, the surveying contents of the three types of business surveying, namely planning condition verification surveying, civil air defense surveying, and real estate surveying, the execution standards and specifications of the three types of business surveying are not completely unified, resulting in inconsistent graphic element drawing rules for calculating areas, and the defined attribute contents and result templates are also completely different. Therefore, the contents of one-time surveying cannot be directly used for the data production of the three types of business. For example, although the area calculation basis standards for real estate surveying and civil air defense surveying are the same, and the graphic elements for calculating areas can be shared, the defined attribute contents are different; the area calculation rules for planning condition verification surveying implement local standards, which are completely different from the area calculation standards for real estate surveying and civil air defense surveying, and the graphic element drawing rules and defined attribute contents are also different from those of real estate surveying and civil air defense surveying. At present, the country is promoting the reform of the construction project approval system. In addition to optimizing the approval process, it is also necessary to compress more than half of the approval time; if the original operation technical route and method are still used, first, it is very difficult to shorten the surveying and mapping operation time while ensuring the result quality; second, the graphic element data between the three types of surveying and mapping services needs to be processed with a precision of up to centimeter level, and all attribute information needs to be redefined. Manual processing will consume a large amount of time for operators and is prone to spatial topology errors and attribute definition omissions. Therefore, there is an urgent need to propose a new technical route and processing method to improve the above situation. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method and system for converting combined surveying and mapping graphic element data based on skeleton line transformation, which can realize automatic transformation of graphic element data.

[0005] To solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] In a first aspect, the present invention provides a joint surveying and mapping primitive data conversion method based on skeleton line transformation. Based on the EPS platform, the middle wall line, outer half wall line, and balcony edge line in the household division of a building project in real estate surveying and mapping are defined as skeleton lines, and then, based on these skeleton lines, the automatic transformation of real estate surveying and mapping primitive data is achieved through predefined transformation rules.

[0007] Further, the joint surveying and mapping primitive data conversion method based on skeleton line transformation specifically includes:

[0008] S1. Define skeleton lines: By analyzing the drawing rules of the primitive of three business types, the middle wall line, outer half wall line, and balcony edge line in the household division of a building project in real estate surveying and mapping are defined as skeleton lines;

[0009] S2. Primitive transformation and attribute conversion: Based on the skeleton lines defined in S1, the real estate surveying and mapping primitives are transformed into the primitives for calculating the area of the planned condition verification measurement through the set transformation rules. Then, after the primitive transformation is successful, the common attribute fields of real estate surveying and mapping and the planned condition verification measurement are compared and converted through the established attribute comparison relationship.

[0010] Further, the transformation rules in S2 include:

[0011] The transformation rules for the outer half wall and the inner space primitive, which are used to transform the outer half wall line and the inner space primitive of the real estate into the inner unit primitive surface of the planned condition verification measurement;

[0012] And the transformation rules for the balcony primitive, which are used to transform the skeleton line of the balcony in real estate surveying and mapping into the balcony primitive of the planned condition verification measurement.

[0013] Further, the transformation rules for the outer half wall and the inner space primitive specifically include:

[0014] S2-11. Directly offset the outer half wall line of the real estate inward according to the set offset value to obtain the outer half wall line of the planned condition verification measurement;

[0015] S2-12. Use the outer half wall line of the planned condition verification measurement obtained in S2-11 and the inner unit primitive of the real estate measurement to form the outer half wall surface, generating the entire floor outer half wall surface;

[0016] S2-13. Find the line segments that overlap with the edge lines of the entire floor outer half wall surface generated in S2-12 in each household's inner unit primitive of the real estate measurement, and use the spatial position analysis method to obtain the nearest distance line segments from the start and end points of each overlapping line segment to the outer half wall line. Then, divide the outer half wall surface through these nearest distance line segments, and merge the divided outer half wall surface with the surface formed by the corresponding inner unit primitive to obtain the inner unit primitive surface of the planned condition verification measurement.

[0017] Further, the balcony primitive transformation rules specifically include:

[0018] S2-21. Retract and expand the skeleton line of the real estate surveying and mapping balcony according to a set value to form a new balcony boundary line;

[0019] S2-22. Break the obtained new balcony boundary line into line segments at the nodes, and then extract the line segments that fall inside the skeleton line and the line segments between the inner wall line and the middle wall line of the external wall from the broken balcony boundary line;

[0020] S2-23. Extend and recombine the extracted line segments to form a surface, and obtain the transformed balcony primitive for the verification measurement of planning conditions.

[0021] In a second aspect, the present invention also provides a joint surveying and mapping primitive data conversion system based on skeleton line transformation, including:

[0022] A skeleton line definition unit for defining the middle wall line, outer half wall line, and balcony edge line in the household division of a building project drawn by real estate surveying and mapping as skeleton lines by analyzing the drawing rules of three business type primitives;

[0023] A primitive transformation unit for transforming the real estate surveying and mapping primitives into the primitives for calculating the area of the verification measurement of planning conditions through transformation rules based on the skeleton line;

[0024] An attribute conversion unit for converting the common attribute fields of real estate surveying and mapping and the verification measurement of planning conditions by means of a formulated attribute mapping relationship for the primitives after successful transformation.

[0025] Further, the primitive transformation unit includes:

[0026] An outer half wall and inner space primitive transformation rule sub-unit for transforming the outer half wall line and inner space primitives of real estate into the inner space primitive surface for the verification measurement of planning conditions;

[0027] And a balcony primitive transformation rule sub-unit for transforming the skeleton line of the real estate surveying and mapping balcony into the balcony primitive for the verification measurement of planning conditions.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] By adopting the above technical solutions, the present invention can realize the automatic transformation of primitive data, reduce the error rate of manual processing of spatial data. At the same time, through the direct transformation of primitives of specified business types, there is no need to redefine the key attributes of the primitives, which simplifies the operation process of operators. It can also realize the automatic conversion of relevant primitive attributes after the automatic change of primitives. Operators only need to supplement the newly added thematic attribute data after conversion, which reduces the operation complexity and improves the operation efficiency. Description of the Drawings

[0030] Figure 1 is a schematic flow chart of the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0031] Figure 2 is a schematic flow chart of the transformation rules for external half-walls and internal space primitives in the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0032] Figure 3 is a schematic flow chart of the transformation rules for balcony primitives in the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0033] Figure 4 is a schematic diagram of real estate surveying and mapping primitives in an embodiment of the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0034] Figure 5 is a schematic diagram of the verification measurement primitives of planning conditions in an embodiment of the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0035] Figures 6 - 10 is a schematic diagram of the transformation of external half-walls and internal space primitives in an embodiment of the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0036] Figures 11 - 13 is a schematic diagram of the transformation of balcony and external half-wall primitives in an embodiment of the method for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention;

[0037] Figure 14 is a schematic structural diagram of the system for converting joint surveying and mapping primitive data based on skeleton line transformation according to the present invention. Detailed implementation manners

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] The present invention provides a method for converting joint surveying and mapping primitive data based on skeleton line transformation. Based on the EPS platform, the wall lines, external half-wall lines, and balcony edge lines in the household division of a building project surveyed and mapped for real estate are defined as skeleton lines, and then, based on these skeleton lines, the automatic transformation of real estate surveying and mapping primitive data is realized through pre-defined transformation rules. As Figure 1 shown, the specific steps include:

[0040] Step S1. Define the skeleton lines: By analyzing the drawing rules of the three business type graphics elements, the middle wall lines, outer half-wall lines, and balcony edge lines of the building engineering housing household division in real estate surveying and mapping are defined as the skeleton lines. Specifically: Draw the spatial range of the real estate graphics element data according to the element codes such as the middle wall lines, outer half-wall lines, and balcony edge lines and perform topological surface construction. After the surface construction is completed, select the graphics element definition function of the system, enter the name and related attribute information of the graphics element. After completing the attribute definition of all graphics elements, record the middle wall lines, outer half-wall lines, and balcony edge lines as the skeleton lines for graphics element transformation.

[0041] For example: First, select the "Real Estate Surveying and Mapping" business type in the two-dimensional and three-dimensional integrated real estate cadastral survey information service system that adopts the joint surveying and mapping graphics element data conversion method described in the present invention, and then start to draw the spatial range of the real estate graphics element data according to the element codes such as "middle wall line of household division", "outer half-wall line", and "balcony edge line" and perform topological surface construction. Then, after the surface construction is completed, select the graphics element definition function of the system, enter the name and related attribute information of the graphics element, complete the attribute definition of all graphics elements, and finally the system automatically records the "middle wall line of household division", "outer half-wall line", and "balcony edge line" as the skeleton lines for graphics element transformation.

[0042] Step S2. Graphics element transformation and attribute conversion: Based on the skeleton lines defined in Step S1, transform the real estate surveying and mapping graphics elements into the graphics elements for calculating the measured area of the planning condition verification according to the set transformation rules. Then, after the successful transformation of the graphics elements, the common attribute fields of the real estate surveying and mapping and the planning condition verification measurement will be compared and converted through the established attribute comparison relationship. Specifically: After sorting out the business rules of the existing real estate surveying and mapping and the planning condition verification surveying and mapping, establish the mapping and comparison relationship of the common attribute fields. The common attribute fields for realizing the mapping and comparison include the graphics element name, functional area classification, structure type, ownership nature, unit number, and household number. Then, compare and convert the common attribute fields of the real estate surveying and mapping and the planning condition verification measurement.

[0043] Among them, the transformation rules include the transformation rules for the outer half-wall and the internal space graphics elements and the transformation rules for the balcony graphics elements. The transformation rules for the outer half-wall and the internal space graphics elements are used to transform the outer half-wall line of the real estate into the internal graphics element surface of the planning condition verification measurement, as Figure 2 shown. The specific steps include:

[0044] Step S2-11. Directly offset the outer half-wall line of the real estate inward according to the set offset value to obtain the outer half-wall line of the planning condition verification measurement. The offset value is preferably set to 0.02 m according to the current business rule requirements. Of course, if the business rule changes, other values can be customized again;

[0045] S2-12. Perform the outer half-wall surface construction on the outer half-wall line obtained in S2-11 and the inner unit primitives of the real estate survey, and generate the entire floor's outer half-wall surface;

[0046] S2-13. Search for the line segments where the inner unit primitives of each household in the real estate survey overlap with the boundary line of the entire floor's outer half-wall surface generated in S2-12. Use the spatial position analysis method to obtain the nearest distance line segments from the start and end points of each overlapping line segment to the outer half-wall line. Then, divide the outer half-wall surface through these nearest distance line segments, and merge the divided outer half-wall surface with the surface formed by the corresponding inner unit primitives to obtain the inner unit primitive surface for the verification measurement of planning conditions.

[0047] The balcony primitive transformation rule is used to transform the skeleton line of the balcony in the real estate survey into the balcony primitive for the verification measurement of planning conditions. As Figure 3 shown, the specific steps include:

[0048] S2-21. Shrink and expand the skeleton line of the balcony in the real estate survey according to a set value to form a new balcony boundary line, where the set value is usually set to 0.02m, which is the thickness of the building wall plaster;

[0049] S2-22. Break the obtained new balcony boundary line into line segments at the nodes. Then, extract the line segments that fall inside the skeleton line and the line segments that fall between the inner wall line and the middle wall line of the outer wall from the broken balcony boundary line;

[0050] Step S2-23. Extend and recombine the extracted line segments to form a surface, and obtain the transformed balcony primitive for the verification measurement of planning conditions.

[0051] The following further illustrates Step 2 through an embodiment, specifically as follows:

[0052] 1. Drawing rules for the three business primitives in the joint surveying and mapping

[0053] (1) Real estate survey: Outer half-wall (including plaster layer), balcony, inner space. The outer half-wall primitive is the range formed by the middle wall line of the outer wall to the outer half-wall line (including 0.02m thick outer wall plaster). The balcony primitive is the range formed by the intersection boundary line of the outer balcony line and the outer wall (including plaster thickness). The inner space primitive is the range formed by the middle wall line of the outer wall and the middle wall line of the household division. As Figure 4 .

[0054] (2) Primitives for the verification measurement of planning conditions: Balcony, inner space (including outer wall, but not including plaster layer). The balcony primitive is the range formed by the intersection boundary line of the outer balcony line and the outer half-wall line (excluding plaster thickness). The inner space primitive is the range formed by the outer half-wall line (excluding plaster thickness) and the middle wall line of the household division. As Figure 5 .

[0055] 2. Transformation of outer half wall and inner space elements:

[0056] Step 1: Directly shift the outer half wall line of the real estate inward by 0.02m to obtain the outer half wall line for planning condition verification measurement; Figure 6 and Figure 7 ,in Figure 7 yes Figure 6 Enlarged view of part A in the middle.

[0057] Step 2: Use the outer half wall line and the real estate measurement unit (household middle wall line) to construct the outer half wall surface and generate the outer half wall surface of the whole layer, such as Figure 8 .

[0058] Step 3: Determine the line segments where the internal elements of each unit in the real estate measurement overlap with the outer half wall edge line, such as Figure 9 Then, for each overlapping line segment, the closest distance line segment to the outer half wall line is obtained, and the outer half wall surface is divided by the closest distance line segment. The divided outer half wall surface is merged with the surface constructed by the corresponding internal element to obtain the planning condition verification measurement internal element surface, such as Figure 10 .

[0059] 3. Balcony and outer half wall element transformation:

[0060] Step 1: The exterior wall line can be directly offset by the plaster thickness (0.02M) according to the exterior wall code.

[0061] Step 2: Expand the balcony line inward and outward by 2 centimeters respectively, and then blast it apart. Figure 11 .

[0062] Step 3: Keep the line inside the balcony and the line between the outer wall line and the center line of the wall after offset, such as Figure 12 .

[0063] Step 4: Extend and trim the retained line to obtain the converted balcony range line, such as Figure 13 .

[0064] Through the joint surveying and mapping metadata conversion method based on skeleton line transformation described in the present invention, on the one hand, it is possible to realize automatic conversion of image metadata, reducing the error rate of manual processing of spatial data; on the other hand, by directly converting the image elements of the specified business type, there is no need to redefine the key attributes of the image elements, thus simplifying the operation process of the operators; thirdly, after the image elements are automatically changed, the automatic conversion of related image element attributes is realized, and the operators only need to supplement the newly added thematic attribute data after the conversion, thus reducing the complexity of the operation and improving the operation efficiency.

[0065] like Figure 14As shown in the figure, the present invention also provides a joint mapping primitive data conversion system based on skeleton line transformation, which includes a skeleton line definition unit 100, a primitive transformation unit 200, and an attribute conversion unit 300. Among them, the skeleton line definition unit 100 is used to define the middle wall line, outer half wall line, and balcony edge line in the household division of building engineering houses drawn in real estate surveying and mapping as skeleton lines by analyzing the drawing rules of three business type primitives; the primitive transformation unit 200 is used to transform the real estate surveying and mapping primitives into the primitives for calculating the area of the planned condition verification measurement based on the skeleton line and through transformation rules. Specifically, the primitive transformation unit 200 includes an outer half wall and inner space primitive transformation rule subunit 201 and a balcony primitive transformation rule subunit 202. The outer half wall and inner space primitive transformation rule subunit 201 is used to transform the outer half wall line of the real estate into the inner primitive surface of the planned condition verification measurement, and the balcony primitive transformation rule subunit 202 is used to transform the skeleton line of the balcony in real estate surveying and mapping into the balcony primitive of the planned condition verification measurement; the attribute conversion unit 300 is used to perform comparison and conversion of the common attribute fields of real estate surveying and mapping and planned condition verification measurement for the primitives after successful transformation through the established attribute comparison relationship.

[0066] The joint mapping primitive data conversion system based on skeleton line transformation described in the present invention is a system based on the above-mentioned joint mapping primitive data conversion method based on skeleton line transformation, and has the same technical effects as the method, which will not be repeated here.

[0067] The above-mentioned implementation manners are only the preferred implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the protection scope required by the present invention.

Claims

1. A joint mapping primitive data conversion method based on skeleton line transformation, characterized in that, This method is based on the EPS platform. By defining the middle wall lines, outer half-wall lines, and balcony edge lines in the household sub-division of building engineering houses drawn by real estate surveying and mapping as skeleton lines, and then, based on the said skeleton lines, through predefined transformation rules, automatic transformation of the metadata of real estate surveying and mapping graphic elements into the graphic elements for verifying planning conditions surveying and mapping is realized; The said transformation rules include: The transformation rules for outer half-walls and in-suite space graphic elements, which are used to transform the outer half-wall lines and in-suite space graphic elements of real estate into the in-suite graphic element surfaces for verifying planning conditions measurement; And the transformation rules for balcony graphic elements, which are used to transform the skeleton lines of balconies in real estate surveying and mapping into the balcony graphic elements for verifying planning conditions measurement; The specific transformation rules for outer half-walls and in-suite space graphic elements include: Directly offset the outer half-wall lines of real estate inward according to the set offset value to obtain the outer half-wall lines for verifying planning conditions measurement; Through the outer half-wall lines for verifying planning conditions measurement and the in-suite graphic elements measured in real estate, construct outer half-wall surfaces to generate the whole-floor outer half-wall surfaces; Search for the line segments where the in-suite graphic elements of each household measured in real estate overlap with the edges of the whole-floor outer half-wall surfaces, and use the spatial position analysis method to obtain the nearest distance line segments from the start and end points of each overlapping line segment to the outer half-wall lines for verifying planning conditions measurement. Then, divide the outer half-wall surfaces through these nearest distance line segments, and then merge the divided outer half-wall surfaces with the surfaces constructed by the corresponding in-suite graphic elements to obtain the in-suite graphic element surfaces for verifying planning conditions measurement.

2. The method according to claim 1, wherein Specifically include: S1. Define skeleton lines: By analyzing the drawing rules of graphic elements of three business types, define the middle wall lines, outer half-wall lines, and balcony edge lines in the household sub-division of building engineering houses drawn by real estate surveying and mapping as skeleton lines; S2. Graphic element transformation and attribute conversion: Based on the skeleton lines defined in S1, transform the real estate surveying and mapping graphic elements into the graphic elements for calculating the area of verifying planning conditions measurement through the set transformation rules. Then, after the successful transformation of the graphic elements, the common attribute fields of real estate surveying and mapping and verifying planning conditions measurement will be compared and converted through the established attribute comparison relationship.

3. The method according to claim 1, wherein The specific transformation rules for balcony graphic elements include: Shrink and expand the skeleton lines of balconies in real estate surveying and mapping according to the set values to form new balcony range lines; Break the obtained new balcony range lines into line segments at the nodes, and then extract the line segments that fall inside the skeleton lines and the line segments between the inner wall lines and the middle wall lines on the outer wall from the broken balcony range lines; Extend and recombine the extracted line segments to construct surfaces to obtain the transformed balcony graphic elements for verifying planning conditions measurement.

4. A system for the method of converting joint mapping primitive data based on skeleton line transformation according to any one of claims 1-3, characterized in that, Include: The skeleton line definition unit, which is used to define the middle wall lines, outer half-wall lines, and balcony edge lines in the household sub-division of building engineering houses drawn by real estate surveying and mapping as skeleton lines by analyzing the drawing rules of graphic elements of three business types; The graphic element transformation unit, which is used to transform the real estate surveying and mapping graphic elements into the graphic elements for calculating the area of verifying planning conditions measurement through transformation rules based on the skeleton lines; The attribute conversion unit, which is used to compare and convert the common attribute fields of real estate surveying and mapping and verifying planning conditions measurement for the graphic elements after successful transformation through the established attribute mapping relationship; The said graphic element transformation unit includes: The outer half-wall and in-suite space primitive transformation rule subunit is used to transform the outer half-wall line and in-suite space primitive of the real estate into the in-suite primitive surface for the verification measurement of planning conditions. And the balcony primitive transformation rule subunit is used to transform the framework line of the balcony in real estate surveying and mapping into the balcony primitive for the verification measurement of planning conditions.

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