CN109933588B - Method and system for converting dwg data into gdb data - Google Patents
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Abstract
The invention discloses a method and a system for converting dwg data into gdb data, which belong to the technical field of vector space data format conversion. The system for converting dwg data into gdb data comprises a data preprocessing module, a data analysis module, a data conversion module and a data output module, wherein the data preprocessing module is used for clearing irregular input data in a dwg format; the data analysis module is used for establishing a comparison relation model; the data conversion module is used for converting dwg graphic elements into corresponding gdb element types. The invention realizes high-precision conversion from dwg data to gdb data, avoids common conversion errors and reduces a large number of subsequent manual processing.
Description
Technical Field
The invention relates to the technical field of vector space data format conversion, in particular to a method and a system for converting dwg data into gdb data.
Background
For various reasons, related space industries such as homeland, surveying and mapping, environment and the like previously have a large amount of dwg data generated by using CAD software, and the establishment of the data consumes a large amount of manpower and material resources. However, with the continuous development of the geographic information system GIS, the outstanding advantages of the geographic information system GIS are increasingly obvious, and the application of the GIS needs a large amount of spatial data related to geographic distribution as a basis. The existing AutoCAD digital topographic map is used as a GIS database to establish a digital form basic data source, so that a great deal of funds are saved, and space data acquisition work is reduced. This requires designing a method of converting AutoCAD format data (dwg format) into GIS format data (gdb format).
The dwg data structure is quite different from the gdb data structure, and the data cannot be completely and directly converted. The function of converting dwg files provided by ArcGIS is generally utilized at present, but the method is limited by the limitation of dwg files on structural description and the difference of two system substructures, the method cannot perform good conversion, various errors and data loss exist in the conversion, normal use is difficult to meet, and subsequent manual auxiliary processing is also available. The main problems with the various solutions existing are: the conversion algorithm is wrong and cannot be used; the pattern type cannot be correctly corresponding; the conversion process loses data; the data topological relation cannot be established; the same class of elements cannot be realized on the same layer, etc.
Disclosure of Invention
The technical task of the invention is to provide a method and a system for converting dwg data into gdb data, which can solve the problems of data conversion type errors, information loss, no attribute value and low efficiency in the process of converting dwg data into gdb data.
The technical scheme adopted for solving the technical problems is as follows:
a method for converting dwg data into gdb data includes establishing a control relation model between different data types by analyzing logic models and physical implementation of dwg data and gdb data, converting dwg primitives into gdb element types based on a control relation model design algorithm, and finally outputting data as a gdb standard file. The method establishes the content of dwg data as gdb data, realizes high-precision conversion of dwg data and gdb data, and avoids conversion errors and subsequent manual processing.
Specifically, the conversion process by the method is as follows:
the irregular input data in the dwg format is cleaned up through data preprocessing;
analyzing the underlying structure of dwg data and gdb data, and establishing a comparison relation model by combining spatial data knowledge;
according to the structural comparison relation of dwg data and gdb data, the dwg graphic element is converted into a corresponding gdb element type;
and finally outputting the converted data to a standard gdb file.
Preferably, the data preprocessing is completed by unifying the coordinates into the same structural data which are irrelevant and complex in the same element classification and cleaning dwg. The processing process prevents the problems of data redundancy, attribute information loss, coordinate system conversion and the like in the subsequent conversion process.
Preferably, the established comparison relation model describes the graph corresponding relation and attribute corresponding relation of dwg data and gdb data.
Specifically, the basic rules of the comparison relation model are as follows: the dwg block primitives correspond to the gdb point elements, the dwg line primitives of different types correspond to the gdb line elements, if the dwg line primitives are closed, the dwg line primitives are converted into gdb polygon elements, the dwg circle primitives correspond to the gdb circle elements, and the dwg arc primitives correspond to the gdb arc segment elements; dwg extended attribute data corresponds to the gdb attribute table.
Preferably, the conversion of dwg primitives into corresponding gdb element types includes dwg block primitive conversion, line primitive conversion, circle primitive conversion and arc primitive conversion;
the dwg block primitives are converted into gdb data, the gdb block primitives are firstly converted into point primitives, and then the primitive expansion information is copied to an attribute table of the point elements;
converting the line drawing element to obtain the coordinates of a component point set of dwg line, reconnecting the points into a line in an algorithm, and copying the extending information of the line drawing element to an attribute table of the element; if the line element is closed (i.e. the last point coordinate is equal to the first point), sequentially reading the point set coordinates to connect into a line, and finally converting into a polygonal element, wherein the attribute conversion is to copy the element expansion information to an attribute table of the element;
round primitive conversion, namely, obtaining the radius and the center point of a primitive circle, generating a circle in a spatial database gdb according to the information, and copying primitive expansion information to an attribute table of an element by attribute conversion;
arc primitive conversion, namely, obtaining the radius, the center point, the starting point and the ending point of the primitive arc segment, generating the arc segment in the gdb according to the information, and copying the primitive expansion information to an attribute table of the element.
Specifically, the conversion mode of converting dwg block primitives into gdb elements is specifically as follows:
when dwg block primitives are converted into gdb data, converting the dwg block primitives into point primitives, and acquiring the point primitive attributes from the point primitives;
1) Firstly, traversing dwg files to read dwg block primitives;
2) Sequentially generating a gdb point element according to the coordinate information (X, Y value and the like) of the block primitive;
3) Copying the graphic element expansion information to an attribute table of the point element;
thus, the newly generated gdb point element is the point element to which the original dwg block primitive should correspond.
Preferably, the output data is stored in a gdb file with a standard structure, and the structure is predefined and comprises included layers, layer names, layer types and the like; according to the set standard structure, firstly, creating a whole space structure library, then gradually creating a new layer graph structure, and then building a complete layer attribute structure.
When the conversion process is completed, the content of the comparison relation model is referred to and output to the corresponding structure in the gdb standard file, and the whole conversion process is completed.
The invention also discloses a system for converting dwg data into gdb data, which comprises a data preprocessing module, a data analysis module, a data conversion module and a data output module,
the data preprocessing module is used for clearing irregular input data in dwg format, namely unifying coordinates into the same kind, classifying the same elements and clearing irrelevant complex structural data in dwg;
the data analysis module is used for analyzing the underlying structure of dwg data and gdb data, establishing a comparison relation model by combining spatial data knowledge, realizing one-to-one correspondence between dwg graphic primitives and gdb elements, and describing graph correspondence and attribute correspondence of the dwg data and the gdb data by the comparison relation model, wherein the basic rules are as follows:
the dwg block primitives correspond to the gdb point elements, the dwg line primitives of different types correspond to the gdb line elements, if the dwg line primitives are closed, the dwg line primitives are converted into gdb polygon elements, the dwg circle primitives correspond to the gdb circle elements, and the dwg arc primitives correspond to the gdb arc segment elements; dwg extended attribute data corresponds to the gdb attribute table;
the data conversion module is used for reading dwg coordinate values and attribute values according to the structure comparison relation of dwg data and gdb data, calling an ArcGIS interface according to the read information to generate a gdb element structure and a numerical value, and realizing that dwg graphic primitives are converted into corresponding gdb element types;
the data output module is used for outputting the converted data to a standard gdb file, and the structure of the data output module is predefined and comprises a layer, a layer name, a layer type and the like; according to the set standard structure, firstly, creating a whole space structure library, then gradually creating a new layer graph structure, and then building a complete layer attribute structure.
When the conversion process is completed, the content of the comparison relation model is referred to and output to the corresponding structure in the gdb standard file, and the whole conversion process is completed.
Specifically, the data conversion module realizes that dwg primitives are converted into corresponding gdb element types, including dwg block primitive conversion, line primitive conversion, circle primitive conversion and arc primitive conversion, wherein
Converting dwg block primitives into gdb data, converting the dwg block primitives into point primitives, acquiring the point primitives from the point primitives, and copying the primitive expansion information to an attribute table of the point elements;
converting the line drawing element to obtain the coordinates of a component point set of dwg line, reconnecting the points into a line in an algorithm, and copying the extending information of the line drawing element to an attribute table of the element; if the line element is closed (i.e. the last point coordinate is equal to the first point), sequentially reading the point set coordinates to connect into a line, and finally converting into a polygonal element, wherein the attribute conversion is to copy the element expansion information to an attribute table of the element;
round primitive conversion, namely, obtaining the radius and the center point of a primitive circle, generating a circle in a spatial database gdb according to the information, and copying primitive expansion information to an attribute table of an element by attribute conversion;
arc primitive conversion, namely, obtaining the radius, the center point, the starting point and the ending point of the primitive arc segment, generating the arc segment in the gdb according to the information, and copying the primitive expansion information to an attribute table of the element.
The system converts the graph and simultaneously completes the process of converting dwg extended attribute information into gdb attribute table data.
Compared with the prior art, the method and the system for converting dwg data into gdb data have the following beneficial effects:
the method or the system can effectively solve the problems that the existing conversion method needs to rely on a plurality of tools, a large amount of information is lost, the types of the converted data are wrong, the efficiency is low and the like when the conversion method is converted from dwg to gdb, and the high-precision conversion is ensured by designing the conversion method according to the characteristics of two data formats of dwg and gdb; by the method or the system, users are free from complex operations of AutoCAD and ArcGIS; the correct correspondence of different dwg primitive types to gdb elements is ensured; based on the bottom layer read data, a large number of conversion failures are avoided, and the conversion efficiency is high; the graph conversion can be completed, and the attribute data conversion can be completed at the same time.
The invention is accurately realized based on the structures of two data, thereby avoiding manual processing conversion errors; therefore, the method can fully utilize the existing dwg file, can reduce a large amount of space data acquisition work in GIS data construction, and can save a large amount of funds and manpower and material resources.
Detailed Description
The invention will be further illustrated with reference to specific examples.
A method for converting dwg data into gdb data includes establishing a control relation model between different data types by analyzing logic models and physical implementation of dwg data and gdb data, converting dwg primitives into gdb element types based on a control relation model design algorithm, and finally outputting data as a gdb standard file. The method establishes the content of dwg data as gdb data, realizes high-precision conversion of dwg data and gdb data, and avoids conversion errors and subsequent manual processing.
Specifically, the conversion process by the method comprises the following steps: the irregular input data in the dwg format is cleaned up through data preprocessing; analyzing the underlying structure of dwg data and gdb data, and establishing a comparison relation model by combining spatial data knowledge; according to the structural comparison relation of dwg data and gdb data, the dwg graphic elements of four categories are converted into corresponding gdb element types; and finally outputting the converted data to a standard gdb file.
1. Data preprocessing
The data preprocessing is completed by unifying the coordinates into the same structural data which are independent and complex in dwg and classified by the same elements. The processing process prevents the problems of data redundancy, attribute information loss, coordinate system conversion and the like in the subsequent conversion process.
2. Data analysis
The data analysis is to analyze the substructure of dwg data and gdb data and establish a comparison relation model by combining spatial data knowledge; the established comparison relation model describes the graph corresponding relation and attribute corresponding relation of dwg data and gdb data.
The basic rules of the control relationship model are: the dwg block primitives correspond to the gdb point elements, the dwg line primitives of different types correspond to the gdb line elements, if the dwg line primitives are closed, the dwg line primitives are converted into gdb polygon elements, the dwg circle primitives correspond to the gdb circle elements, and the dwg arc primitives correspond to the gdb arc segment elements; dwg extended attribute data corresponds to the gdb attribute table.
3. Data conversion
The dwg primitive is converted into the corresponding gdb element type which comprises four categories of dwg block primitive conversion, line primitive conversion, circle primitive conversion and arc primitive conversion.
1. dwg block primitive conversion
When dwg block primitives are converted into gdb data, the dwg block primitives are converted into point primitives, and the point primitive attributes are acquired from the point primitives.
(1) Firstly, traversing dwg files to read dwg block primitives;
(2) Sequentially generating a gdb point element according to the coordinate information (X, Y value and the like) of the block primitive;
(3) Copying the graphic element expansion information to an attribute table of the point element;
the new gdb point element is the point element to which the original dwg block primitive should correspond.
2. Line primitive conversion
The line primitive conversion is to obtain the coordinates of the component point set of dwg line, and the points are connected into line in algorithm, and the attribute conversion is to copy the primitive expansion information to the attribute table of the element.
If the line element is closed (i.e. the last point coordinate is identical to the first point), the coordinates of the sequentially read point sets are connected into a line, and finally converted into a polygonal element, and the attribute conversion is to copy the element expansion information to an attribute table of the element.
3. Round primitive conversion
The radius and the center point of the primitive circle are obtained, the circle is generated in the spatial database gdb according to the information, and the attribute conversion is to copy the primitive expansion information to the attribute table of the element.
4. Arc primitive conversion
Obtaining radius, center point, starting point and ending point of the arc segment of the primitive, generating the arc segment in gdb according to the information, and copying the primitive expansion information to the attribute table of the element by attribute conversion.
4. Outputting data to gdb standard file
The output data is stored in a gdb file with a standard structure, and the structure is predefined and comprises layers, layer names, layer types and the like. According to the set standard structure, firstly, creating a whole space structure library, then gradually creating a new layer graph structure, and then building a complete layer attribute structure.
When the conversion process of the previous step is finished, the content of the comparison relation model is referred to and output to the corresponding structure in the gdb standard file, and the whole conversion process is finished.
As another embodiment of the invention, a system for converting dwg data into gdb data comprises a data preprocessing module, a data analysis module, a data conversion module and a data output module.
The data preprocessing module is used for clearing irregular input data in dwg format, namely unifying coordinates into the same kind, classifying the same elements and clearing irrelevant complex structural data in dwg.
The data analysis module is used for analyzing the underlying structure of dwg data and gdb data, establishing a comparison relation model by combining spatial data knowledge, realizing one-to-one correspondence between dwg graphic primitives and gdb elements, and describing graph correspondence and attribute correspondence of the dwg data and the gdb data by the comparison relation model, wherein the basic rules are as follows:
the dwg block primitives correspond to the gdb point elements, the dwg line primitives of different types correspond to the gdb line elements, if the dwg line primitives are closed, the dwg line primitives are converted into gdb polygon elements, the dwg circle primitives correspond to the gdb circle elements, and the dwg arc primitives correspond to the gdb arc segment elements; dwg extended attribute data corresponds to the gdb attribute table.
The data conversion module is used for reading dwg coordinate values and attribute values according to the structure comparison relation of dwg data and gdb data, calling an ArcGIS interface according to the read information to generate a gdb element structure and a numerical value, and realizing that dwg graphic primitives are converted into corresponding gdb element types;
including dwg block primitive translation, line primitive translation, circle primitive translation, and arc primitive translation, wherein
Converting dwg block primitives into gdb data, converting the dwg block primitives into point primitives, acquiring the point primitives from the point primitives, and copying the primitive expansion information to an attribute table of the point elements;
converting the line drawing element to obtain the coordinates of a component point set of dwg line, reconnecting the points into a line in an algorithm, and copying the extending information of the line drawing element to an attribute table of the element; if the line element is closed (i.e. the last point coordinate is equal to the first point), sequentially reading the point set coordinates to connect into a line, and finally converting into a polygonal element, wherein the attribute conversion is to copy the element expansion information to an attribute table of the element;
round primitive conversion, namely, obtaining the radius and the center point of a primitive circle, generating a circle in a spatial database gdb according to the information, and copying primitive expansion information to an attribute table of an element by attribute conversion;
arc primitive conversion, namely, radius, center point, starting point and ending point of primitive arc segments are obtained, arc segments are generated in gdb according to the information, and primitive expansion information is copied to an attribute table of elements in attribute conversion;
the data output module is used for outputting the converted data to a standard gdb file, and the structure of the data output module is predefined and comprises a layer, a layer name, a layer type and the like; according to the set standard structure, firstly, creating a whole space structure library, then gradually creating a new layer graph structure, and then building a complete layer attribute structure.
When the conversion process is completed, the content of the comparison relation model is referred to and output to the corresponding structure in the gdb standard file, and the whole conversion process is completed.
The system converts the graph and simultaneously completes the process of converting dwg extended attribute information into gdb attribute table data.
The present invention can be easily implemented by those skilled in the art through the above specific embodiments. It should be understood that the invention is not limited to the particular embodiments described above. Based on the disclosed embodiments, a person skilled in the art may combine different technical features at will, so as to implement different technical solutions.
Claims (4)
1. A method for converting dwg data into gdb data is characterized in that the method establishes a comparison relation model between different data types by analyzing a logic model and physical realization of the dwg data and the gdb data, converts dwg primitives into gdb element types based on a comparison relation model design algorithm, and finally outputs data as gdb standard files;
the conversion process by the method is as follows:
the irregular input data in the dwg format is cleaned up through data preprocessing;
analyzing the underlying structure of dwg data and gdb data, and establishing a comparison relation model by combining spatial data knowledge;
according to the structural comparison relation of dwg data and gdb data, the dwg graphic element is converted into a corresponding gdb element type;
finally, outputting the converted data to a standard gdb file;
the data preprocessing refers to unifying coordinates into the same structural data which are independent and complex in dwg and classified by the same elements;
the established comparison relation model describes the graph corresponding relation and attribute corresponding relation of dwg data and gdb data;
the basic rules of the control relationship model are: the dwg block primitives correspond to the gdb point elements, the dwg line primitives of different types correspond to the gdb line elements, if the dwg line primitives are closed, the dwg line primitives are converted into gdb polygon elements, the dwg circle primitives correspond to the gdb circle elements, and the dwg arc primitives correspond to the gdb arc segment elements; dwg extended attribute data corresponds to the gdb attribute table;
the dwg primitive is converted into the corresponding gdb element type which comprises dwg block primitive conversion, line primitive conversion, circle primitive conversion and arc primitive conversion;
the block primitive is converted into gdb data, firstly converted into point primitives, and then the primitive expansion information is copied to an attribute table of the point elements;
converting the line drawing element to obtain the coordinates of a component point set of dwg line, reconnecting the points into a line in an algorithm, and copying the extending information of the line drawing element to an attribute table of the element; if the line drawing element is closed, sequentially reading coordinates of the point sets to form lines, and finally converting the lines into polygonal elements, and copying the extending information of the line drawing element to an attribute table of the elements;
round primitive conversion, namely obtaining the radius and the center point of a primitive circle, generating a circle in gdb according to the information, and copying primitive expansion information to an attribute table of an element;
and converting the arc primitive to obtain the radius, the center point, the starting point and the ending point of the arc segment of the primitive, generating the arc segment in the gdb according to the information, and copying the primitive expansion information to the attribute table of the element.
2. The method for converting dwg data into gdb data according to claim 1, wherein the conversion mode of dwg block primitives into gdb elements is specifically as follows:
1) Firstly, traversing dwg files to read dwg block primitives;
2) Sequentially generating a gdb point element according to the coordinate information of the block primitive;
3) Copying the graphic element expansion information to an attribute table of the point element;
thus, the newly generated gdb point element is the point element to which the original dwg block primitive should correspond.
3. The method for converting dwg data to gdb data according to claim 1, wherein the output data is stored in a gdb file having a standard structure, the structure comprising a layer, a layer name, and a layer type; according to the set standard structure, firstly, creating a whole space structure library, then gradually creating a new layer graph structure, and then building a complete layer attribute structure.
4. A system for converting dwg data into gdb data is characterized by comprising a data preprocessing module, a data analysis module, a data conversion module and a data output module,
the data preprocessing module is used for clearing irregular input data in dwg format;
the data analysis module is used for analyzing the substructures of dwg data and gdb data, and establishing a comparison relation model by combining spatial data knowledge to realize one-to-one correspondence between dwg graphic primitives and gdb elements;
the data conversion module is used for reading dwg coordinate values and attribute values according to the structure comparison relation of dwg data and gdb data, generating a gdb element structure and a numerical value, and realizing conversion of dwg primitives into corresponding gdb element types;
the data output module is used for outputting the converted data to a standard gdb file;
the data preprocessing refers to unifying coordinates into the same structural data which are independent and complex in dwg and classified by the same elements;
the established comparison relation model describes the graph corresponding relation and attribute corresponding relation of dwg data and gdb data; the basic rules of the control relationship model are: the dwg block primitives correspond to the gdb point elements, the dwg line primitives of different types correspond to the gdb line elements, if the dwg line primitives are closed, the dwg line primitives are converted into gdb polygon elements, the dwg circle primitives correspond to the gdb circle elements, and the dwg arc primitives correspond to the gdb arc segment elements; dwg extended attribute data corresponds to the gdb attribute table;
the data conversion module is used for converting dwg graphic elements into corresponding gdb element types, wherein the dwg graphic element types comprise dwg block graphic element conversion, line graphic element conversion, circle graphic element conversion and arc graphic element conversion:
the block primitive is converted into gdb data, firstly converted into point primitives, and then the primitive expansion information is copied to an attribute table of the point elements;
converting the line drawing element to obtain the coordinates of a component point set of dwg line, reconnecting the points into a line in an algorithm, and copying the extending information of the line drawing element to an attribute table of the element; if the line drawing element is closed, sequentially reading coordinates of the point sets to form lines, and finally converting the lines into polygonal elements, and copying the extending information of the line drawing element to an attribute table of the elements;
round primitive conversion, namely obtaining the radius and the center point of a primitive circle, generating a circle in gdb according to the information, and copying primitive expansion information to an attribute table of an element;
and converting the arc primitive to obtain the radius, the center point, the starting point and the ending point of the arc segment of the primitive, generating the arc segment in the gdb according to the information, and copying the primitive expansion information to the attribute table of the element.
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