CN106503204A - The shared MapGIS dot-form map symbol methods of OMS - Google Patents

Abstract

The invention discloses a method for OMS sharing MapGIS point map symbols, including: (1) MapGIS point map symbol data extraction: exporting MapGIS point map symbols into XML format files, and reading symbol information for this type of XML file and traversal; (2) MapGIS point map symbol attribute information to OMS map symbol mapping: analyze the attribute information of MapGIS point map symbols from the extracted information, and share the attribute information with OMS point map symbols; (3) MapGIS point map symbol shape information to OMS map symbol mapping: From the information extracted from MapGIS point map symbols, identify the shape category of MapGIS point map symbols, and map different shape information into point map symbols of OMS map symbols. This method can greatly improve the reusability efficiency of point map symbols in heterogeneous platforms.

Description

OMS Shares MapGIS Point Map Symbol Method

technical field

The invention relates to the field of geographic information sharing and visual expression, in particular to a method for sharing MapGIS point map symbols to an open map symbol model (OMS).

Background technique

Map symbol sharing is an important research field in the visual expression and sharing of geographic information. The map symbol sharing technology mainly solves the problem of "symbol information islands" caused by platform differences. In actual production, the map symbols of different platforms are stored independently and have no intersection with each other. When sharing data, it is difficult to realize the synchronous sharing of map symbol information, resulting in a large amount of symbol data redundancy, which brings about a large number of repeated map symbols. workload.

The rise and development of my country's GIS technology is inseparable from the diversified evolution of the traditional GIS platform. At present, commercial GIS platforms active in the GIS field mainly include ArcGIS, Super Map, MapGIS, Geo Star, etc. These platforms are widely used in land, planning, agriculture and forestry, environmental protection, surveying and mapping and other fields, and gradually evolved into a pattern in which GIS platforms monopolize the industry market, which can be called "difficult to break technical barriers between GIS industries". The occurrence of this phenomenon seriously hinders the information transmission among various industries, and also greatly limits the space for the integration of GIS platforms and industries. GIS scholars have launched a lot of technical research and academic exploration, and the concept of data sharing and open source GIS came into being. Data sharing is specifically aimed at the spatial data organization form of heterogeneous GIS platforms, and proposes mutual data exchange methods. These geospatial data sharing technologies and methods are becoming more mature and robust. However, in the process of expressing geographic information, it is difficult to share synchronously with geospatial data because of platform differences.

In the field of mining and geological applications, the MapGIS platform is often used as the GIS platform for spatial data expression and storage. The map symbols in the MapGIS platform include three types of map symbols: point, line, and plane. Point map symbols can be divided into vector point map symbols , font point map symbols and raster point map symbols, among which point map symbols have the most complex structure and are difficult to share with MapGIS spatial data synchronously. Faced with this problem, the traditional solution is to use the form of a symbol comparison table to build a set of point-shaped map symbol comparison tables on the shared target platform to establish index correspondence. On the one hand, this solution needs to spend a lot of time to create the point map symbol library of the target platform; on the other hand, for the update and change of map symbols, it also needs to be updated, which brings a large symbol editing workload. The name is "AutoCAD block and path-based point map symbol exchange method" (application number 201019026028.1, publication number 101783023B), and the name is "TrueType symbol and path-based point map symbol exchange method" (application number 201019026034.7, publication number 101799933B), the patent titled "Exchanging Method for Point Map Symbols by Primitive Method and Point Map Symbol Based on Path" (Application No. 201019026026.2, Publication No. 101751683B), discloses AutoCAD blocks, TrueType symbols and point map symbols by primitive method Map symbols and path-based point map symbol exchange methods, but none of them involve the Open Map Symbol (OMS) shared MapGIS point map symbol method.

In order to solve the above problems, a map symbol sharing method is needed. By using this method, the point map symbols under the MapGIS platform can be used in the ArcGIS platform, so that the OMS can share the MapGIS point map symbols and improve the efficiency of the use of map symbols.

Contents of the invention

The invention aims to improve the defects existing in the sharing of existing map symbols, and solve the problem of sharing point map symbols in heterogeneous platforms. Introduce the open map symbol model (Open Map Symbol symbol model, OMS symbol model for short), propose OMS map symbol sharing MapGIS point map symbol primitive method, provide MapGIS point symbol primitive to OMS point map symbol model mapping scheme, realize OMS symbols share MapGIS point map symbols.

The technical scheme adopted in the present invention is:

OMS shares the MapGIS point map symbol method, which includes MapGIS point map symbol data extraction, mapping of MapGIS point map symbol attribute information to OMS map symbols, and mapping of MapGIS point map symbol shape information to OMS map symbols.

The MapGIS point map symbol data extraction includes the following steps:

Step 11, exporting the MapGIS point map symbol library: In the MapGIS symbol browser, select the point map symbol library to be shared, and save the MapGIS point map symbol library to the local computer in XML format;

Step 12, XML format MapGIS point map symbol data information extraction: traverse each map symbol node in the point map symbol library to obtain MapGIS point map symbol data information;

The mapping of the MapGIS point map symbol attribute to the OMS map symbol includes the following steps:

Step 21, MapGIS point map symbol basic information mapping: for the XML symbol library header file information obtained in step 12, extract the point map symbol library name and the number of point map symbols; traverse the points of the XML symbol library header file Shape symbol node, extract the header file information of each symbol, including symbol category, data length, number of primitives, symbol center point, symbol code and symbol name; for the obtained symbol library header file, create an empty space based on the OMS map symbol structure symbol library object; for the traversal process of each point map symbol node in the XML symbol library header file, create an OMS point map symbol, and set the symbol category, path number, symbol code and symbol of the current OMS point map symbol attribute information of the name;

Step 22, MapGIS point map symbol enclosing mapping: for the graph element shape information in the point map symbol information in the obtained XML symbol library header file, calculate the maximum and minimum values of coordinates X and Y of all graph element points, Thus, the largest circumscribing rectangle of the point map symbol is constructed, and the circumscribing rectangle information is used as a bounding box to map to the point map symbol in the bounding box of the OMS point map symbol;

Step 23, MapGIS point map symbol unit mapping: perform unit conversion for the shape coordinate information of the MapGIS point map symbol;

The mapping of the MapGIS point map symbol shape information to the OMS map symbol refers to: for each point map symbol traversal in the read XML symbol library header file, obtain the symbol item node of the ith point map symbol in the traversal, The node is the geometric information of the point map symbol, and the spatial information in the node is mapped to the path of the OMS point map symbol, which specifically includes the following steps:

Step 31, Interpretation of point map symbol category: For map symbols of different types in the MapGIS point map symbol data information obtained in step 12, filter out point type map symbols, and determine the point map symbol category. The category is divided into: vector For point symbols, grid point symbols and TrueType font symbols, perform the following step 32, step 33 or step 34 according to the category of point map symbols;

Step 32, mapping the vector point symbol to the OMS point map symbol: map each graphic element of the vector point symbol to an OMS vector path layer, and add all the mapped vector path layers to the OMS point map symbol ;

Step 33, mapping the grid point symbol to the OMS point map symbol: mapping the grid point symbol data to an OMS texture path layer, and adding the texture path layer to the OMS point map symbol;

Step 34, mapping the TrueType font point map symbol to the OMS point map symbol: mapping the TrueType font symbol to the OMS font path layer, and adding it to the OMS point map symbol;

Step 35, storing OMS point map symbols: storing the converted point map symbols in the OMS point map symbol library.

The OMS shared MapGIS point map symbol method of the present invention aims at the map symbol characteristics of the heterogeneous GIS platform, introduces the OMS open map symbol model, proposes the OMS shared MapGIS point map symbol method, and provides MapGIS symbol library point map symbol information extraction, MapGIS The point map symbol attribute information mapping method and the MapGIS point map symbol shape information mapping method provide a new technical solution for the sharing of MapGIS map point primitives to the OMS open map symbol model, and verify the openness of the OMS map symbol model. It helps to reduce the problem of missing information in the sharing process of point map symbols, and greatly improves the reusability efficiency of point map symbols in heterogeneous platforms.

Description of drawings

Fig. 1 is the OMS shared MapGIS point map symbol structural representation of the present invention;

Fig. 2 is the MapGIS dot map symbol attribute and the shape structure schematic diagram of the present invention;

Fig. 3 is a schematic structural representation of the OMS dotted map symbol structure of the present invention;

Fig. 4 is that the MapGIS vector symbol mapping of the present invention is the schematic diagram of the OMS path point shape map symbol layer;

Fig. 5 is that the MapGIS font graphic element of the present invention is mapped to the OMS font dotted map symbol layer schematic diagram;

Fig. 6 is a schematic diagram of the mapping of MapGIS raster primitives into OMS raster point map symbol layers according to the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, OMS shares the MapGIS point map symbol method, which includes three parts: MapGIS point map symbol data extraction, MapGIS point map symbol attribute data mapping, and MapGIS point map symbol shape data mapping to OMS. MapGIS point-like map symbol data extraction refers to the MapGIS point-like map symbol that the present invention designs is exported as XML format file, and at the method for this class XML file symbol information reading and traversal; MapGIS point-like map symbol attribute data mapping refers to from The method of analyzing the attribute information of MapGIS point map symbols from the extracted information, and sharing the attribute information with OMS point map symbols; the mapping of MapGIS point map symbol shape data to OMS refers to the information extracted from MapGIS point map symbols In , the shape category of MapGIS point map symbols is identified, and different shape information is mapped to point map symbols of OMS map symbols. Each implementation step is described below for reference.

This example uses Windows 7 as the operating system environment, MapGIS K9 secondary development version as the experimental platform, Microsoft Visual studio2010 as the development environment, C++, XML as the development language, OMS symbol previewer as the result verification platform, and MapGIS point map symbol library The XML format is output as a .xml format file, and the output file of the OMS map symbol library is stored as a .LS format symbol library file.

(1) Data extraction of MapGIS point map symbol library includes the following steps:

Step 1MapGIS point map symbol library export;

Step 2 XML format MapGIS point map symbol information extraction.

The specific implementation steps are as follows:

Step 1 MapGIS point map symbol library export refers to the map editor of MapGIS K9 version, open the map symbol library manager, select the point map symbol library to be shared, and click the "export the whole library to XML format" button, in the pop-up In the Save dialog box, select the export XML file path and save it.

Step 2 XML format MapGIS point map symbol data information extraction, pointing to the XML format MapGIS point map symbol file, read the XML format point map symbol library information, including identifying and reading the XML root of the MapGIS point map symbol library Node information and sub-node information, where the XML root node describes the software version and file path of the MapGIS point map symbol; sub-node information is divided into three categories: symbol library header information, symbol library subcategory information, and symbol information in the symbol library , where the header information of the symbol library includes the symbol library identification, the name of the symbol library, the number of subcategories of the symbol library, and the number of symbols contained, the subcategory information of the symbol library includes the subcategory code and the name of the subcategory, and the specific symbol information in the symbol library Including symbol header information and symbol primitive information, where symbol header information includes symbol type, symbol classification code, data length, number of sub-picture elements, symbol origin, symbol code, name, deletion mark and color information, symbol primitive The information includes the number of sub-primitives, outline information of primitives, data length, attribute information of filling and shape information of primitives.

(2) MapGIS point map symbol attribute data mapping includes the following steps:

Step 1MapGIS point map symbol basic information mapping;

Step 2MapGIS dotted map symbols surround and map;

Step 3MapGIS point map symbol unit mapping.

The specific implementation steps are as follows:

Step 1MapGIS point map symbol basic information mapping, according to the point map symbol library attribute information in XML format, construct a symbol library class, store symbol library name, symbol subclass, symbol number information, and map symbol library attributes to OMS point shape The symbol library name and symbol category of the map symbol library; according to the MapGIS point map symbol attributes, build a symbol class, store the symbol name, symbol code, subclass, symbol primitive, symbol color, outline, fill information, and build it The symbol class is mapped to the name, code, and category attribute of the OMS point map symbol, and the storage structure is as shown in Figure 2;

Step 2MapGIS point map symbol enclosing mapping, according to the shape information of the primitive in the point map symbol information in XML, calculate the maximum and minimum values of X and Y of all primitive points, and thus construct a point map symbol The largest circumscribing rectangle, the circumscribing rectangle information is used as a bounding box, and mapped to the bounding box of the OMS point map symbol.

Step 3 MapGIS point map symbol unit mapping, according to the shape coordinate information of the MapGIS point map symbol, perform corresponding unit conversion. In the MapGIS map symbol editor, the map symbol unit is millimeter, and in the converted XML file, the map symbol unit is ten-thousandth of a millimeter. When performing unit conversion, according to the different unit conversion requirements of OMS, establish one by one Mapping conversion mode to realize conversion methods for millimeters, centimeters, decimeters, pounds, etc.;

(3) MapGIS point map symbol shape data mapping includes the following steps:

Step 1 Interpretation of point map symbol categories: used to filter out point map symbols from the MapGIS symbol library, for point map symbols, identify point map symbol categories from the symbol category nodes in the header file and process them separately;

Step 2 Mapping vector point symbols to OMS point map symbols: used to map each graphic element of vector point symbols to OMS vector route layers, and add all mapped vector route layers to OMS point map symbols middle;

Step 3: mapping the grid point symbol to the OMS point map symbol;

Step 4 Mapping of TrueType font point map symbols to OMS point map symbols;

Step 5 OMS point map symbol storage.

The specific implementation steps are as follows:

Step 1 Analysis of point map symbol class header file: For the current MapGIS point map symbol library, traverse the specific Symbol node, read and traverse the Symbol Head child node under the Symbol node, obtain the value of the symbol category node, and judge whether the node value is If the node value is 257, the point symbol is a vector point symbol; if the node value is 258, the point symbol is a grid point symbol; if the node value is 260, the point symbol is a TrueType font symbol type; if the node value is other enumeration value, it indicates that the symbol is not a point map symbol, and no point symbol shape information mapping is performed;

Step 2 Mapping vector point symbols to OMS point map symbols: for MapGIS vector point map symbols, traverse and read the Symbol Item primitives under the symbol node, and determine the primitive category of each submap of the vector point symbol, mainly including lines (curve), filled area, solid circle, hollow circle, and arc, respectively, for each type of submap primitive category, establish a mapping model between the primitive and the vector path layer. The specific mapping method is as follows:

(1) Line (curve) sub-graphic entity mapping method

MapGIS line (curve) primitives are stored under the Line node as a sequence of discrete point coordinates, and the primitive information includes stroke color and stroke width. For the trajectory of the line (curve) primitive, traverse all the coordinate pairs of the primitive to determine whether it is the starting point of the polyline: if yes, then in OMS, Path->MoveTo to the first node of the MapGIS polyline primitive, if not: take Path->LineTo Method, drawing is connected to the previous point until traversing to the last coordinate point to construct an OMS path; the stroke color and pen width of the line (curve) sub-entity are directly mapped to the OMS simple stroke style; the line (curve) sub-entity There is no filling content, so filling mapping is performed for this type of primitive;

(2) Mapping method of sub-graphic elements in filled area

The filling boundary path of the MapGIS filling area primitive is stored under the Polygon node as a closed discrete point coordinate sequence. The starting point and the ending point of the coordinate sequence are the same coordinate point, forming a closed interval. Aiming at the map element boundary of the filled area in MapGIS, traverse the coordinate sequence, call the Path->MoveTo and Path->LineTo methods of Path in OMS to construct the path, and call the Path->Close method when traversing to the end point to realize the closure of the filled area; outline strokes of the filled area The information obtains the stroke line width and color through OuterPen and OuterColor, and directly maps it to the OMS simple stroke style; the fill color of the filled area obtains the fill color through the InterColor node, and converts it to the OMS simple fill style;

(3) Solid circle sub-graphic element mapping method

The solid circle sub-entity is composed of a perfect circle shape outline and internal filling, and the position of the solid circle is determined by the center of the circle and the point on the circumference that passes through the diameter in the vertical direction. For the solid circle sub-graphic element, read the coordinate information of the Center and S_DOT nodes, and call the Path->AddCircle method of the OMS path to create a vector path; the outline stroke color and line width information of the solid circle are mapped to the OMS simple stroke style; the fill color of the solid circle is constructed OMS simple filling style construction;

(4) Hollow circle sub-graphic element mapping method

The hollow circle sub-entity only contains the shape of a perfect circle (without filling), and the position of the hollow circle is determined by the center of the circle and the point on the circumference that passes through the diameter in the vertical direction. Map the hollow circle sub-entity to the OMS vector path layer, obtain the center and radius information, and call the Path->AddCircle method to create a vector path; the line width and color information of the hollow circle sub-entity path are mapped to the simple stroke style of OMS;

(5) Arc sub-graphic element mapping method

The arc sub-entity is a part of the circumference of the hollow circle (excluding filling), and the position of the arc primitive is determined by the center of the circle, the starting point on the circumference, and the end point on the circumference. For the arc sub-primitive mapping model, obtain the coordinate information of the Center and S_DOT nodes, and construct the path by calling the Path->AddArc method of OMS; the color and line width information of the arc sub-prime path is obtained by the OuterPen and OuterColor nodes, and mapped Simple stroke style for OMS;

Step 3 Mapping the grid point symbol to the OMS point map symbol: for the MapGIS grid point symbol, read the path of the raster image under the RasterData node, read the Bitmap to the memory, and call the TexturePointSymbolLayer of OMS by creating a texture path layer ->SetTexturePath method realizes the mapping of the grid point symbol to the texture path layer of OMS;

Step 4 Mapping of TrueType font point map symbols to OMS point map symbols: For TrueType font symbols of MapGIS, read the TTF code (usually hexadecimal code) and font name of the font, and call FontPointSymbol- >SetFontFamily, FontPointSymbol->SetCode method to set the font name and character code, and complete the mapping from TrueType font point map symbols to OMS font symbols.

Step 5 OMS point map symbol storage: According to the MapGIS point map symbol mapping result completed in the above steps, obtain the constructed OMS point map symbol, read the OMS map symbol library, call SymbolLibrary->AddLineSymbol and Save method to save the conversion result to under the specified path.

Claims (1)

1. OMS shares the MapGIS point map symbol method, which is characterized in that the method includes MapGIS point map symbol data extraction, MapGIS point map symbol attribute information to OMS map symbol mapping, MapGIS point map symbol shape information to OMS map symbol Map three parts; The MapGIS point map symbol data extraction includes the following steps: Step 11, exporting the MapGIS point map symbol library: In the MapGIS symbol browser, select the point map symbol library to be shared, and save the MapGIS point map symbol library to the local computer in XML format; Step 12, XML format MapGIS point map symbol data information extraction: traverse each map symbol node in the point map symbol library to obtain MapGIS point map symbol data information; The mapping of the MapGIS point map symbol attribute to the OMS map symbol includes the following steps: Step 21, MapGIS point map symbol basic information mapping: for the XML symbol library header file information obtained in step 12, extract the point map symbol library name and the number of point map symbols; traverse the points of the XML symbol library header file Shape symbol node, extract the header file information of each symbol, including symbol category, data length, number of primitives, symbol center point, symbol code and symbol name; for the obtained symbol library header file, create an empty space based on the OMS map symbol structure symbol library object; for the traversal process of each point map symbol node in the XML symbol library header file, create an OMS point map symbol, and set the symbol category, path number, symbol code and symbol of the current OMS point map symbol attribute information of the name; Step 22, MapGIS point map symbol enclosing mapping: for the graph element shape information in the point map symbol information in the obtained XML symbol library header file, calculate the maximum and minimum values of coordinates X and Y of all graph element points, Thus, the largest circumscribing rectangle of the point map symbol is constructed, and the circumscribing rectangle information is used as a bounding box to map to the point map symbol in the bounding box of the OMS point map symbol; Step 23, MapGIS point map symbol unit mapping: perform unit conversion for the shape coordinate information of the MapGIS point map symbol; The mapping of the MapGIS point map symbol shape information to the OMS map symbol refers to: for each point map symbol traversal in the read XML symbol library header file, obtain the symbol item node of the ith point map symbol in the traversal, The node is the geometric information of the point map symbol, and the spatial information in the node is mapped to the path of the OMS point map symbol, which specifically includes the following steps: Step 31, Interpretation of point map symbol category: For map symbols of different types in the MapGIS point map symbol data information obtained in step 12, filter out point type map symbols, and determine the point map symbol category. The category is divided into: vector For point symbols, grid point symbols and TrueType font symbols, perform the following step 32, step 33 or step 34 according to the category of point map symbols; Step 32, mapping the vector point symbol to the OMS point map symbol: map each graphic element of the vector point symbol to an OMS vector path layer, and add all the mapped vector path layers to the OMS point map symbol ; Step 33, mapping the grid point symbol to the OMS point map symbol: mapping the grid point symbol data to an OMS texture path layer, and adding the texture path layer to the OMS point map symbol; Step 34, mapping the TrueType font point map symbol to the OMS point map symbol: mapping the TrueType font symbol to the OMS font path layer, and adding it to the OMS point map symbol; Step 35, storing OMS point map symbols: storing the converted point map symbols in the OMS point map symbol library.