Some standard content:
CH/T 4015--2001
This standard mainly specifies the basic principles for establishing a topographic map symbol library. Since the symbol libraries in existing geographic information system software and computer mapping software are quite different, this standard does not specify the content related to the interface. There are many types of thematic map symbols in different forms, and this standard only makes principle provisions for this. This standard shall be implemented from April 1, 2001. This standard is proposed and managed by the State Administration of Surveying, Mapping and Geoinformation. The drafting unit of this standard: Surveying and Mapping Standardization Institute of the State Administration of Surveying, Mapping and Geoinformation. The main drafters of this standard: Xue Ming, Zhang Kun, Xiao Xuenian. 579
1 Scope
Standard of the Surveying and Mapping Industry of the People's Republic of China
General rules for building
cartographic symbols base
CH/T 4015--2001
This standard specifies the basic principles for building various types of topographic map symbol bases, and is applicable to the design, establishment, maintenance, updating and management of topographic map symbol bases. Thematic map symbol bases may also be implemented as a reference. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T13923--1992 Classification and code of basic land information GB/T15660-1995 1:5000, 1:10000, 1:25000, 1:50000, 1:100000 Classification and code of topographic map elements
GB14804--1993 1:500, 1:1000, 1:2000 Classification and code of topographic map elements GB2312-1980 Basic set of Chinese character encoding character set for information exchange GB/T16680-1996 Software Document Management Guide 3 General Principles
The establishment of a map symbol library must follow the principles of completeness, extensibility, universality, flexibility, accuracy and ease of use. (1) A map symbol library should be a dedicated software system with complete structure and functions, or a component of other geographic information systems and computer mapping systems. It should be able to provide the creation, organization, retrieval, management and application of various map symbols, as well as the addition, deletion and modification of symbols.
(2) The map symbol library should be able to manage and produce all current topographic map symbols of various scales, and can also support various thematic map symbols as needed.
(3) The map symbol library should have the ability to expand, update and adjust according to different conditions and diagram changes. (4) When designing and establishing the map symbol library, various detailed documents should be compiled and retained at the same time for use in system maintenance and updating. The content and writing format of the document shall be implemented in accordance with GB/T16680-1996. (5) The map symbol library should have a common data format and interface. (6) The symbols managed and produced by the map symbol library must be highly flexible. The parameter variables such as color, size, rotation, plane position, etc. of the symbol should be external variables.
(7) The design and production of map symbols must meet the accuracy requirements of the map, should have a clear extension, and the enlargement, reduction and rotation of the symbol should not cause deformation.
(8) The map symbol library shall provide users with convenient tools and a good user interface. Approved by the State Administration of Surveying, Mapping and Geoinformation on March 5, 2001
Implemented on April 1, 2001
4 Classification of map symbols
CH/T 4015 --2001
The classification of map symbols shall generally be based on the geometric characteristics of the symbols, the implementation methods or operation methods, and the functions of the software platform supported by the map symbol library.
4.1 Point symbols
4.1.1 Point symbols are used to describe independent features. A point symbol includes multiple primitives and parameters. It can also be used to describe various primitives that appear in complex linear symbols and surface symbols.
4.1.2 The definition format of point symbols is as follows: *Symbol category code
Position point coordinates; Parameter 1. Parameter 2.
(Definition body)*
Wherein, * is the start identifier and the end identifier; The symbol category is D;
The definition body can have multiple lines, and its basic format is: Element name 1, parameter 1. Parameter 2, ·…
Element name 2, parameter 1, parameter 2, …·
4.1.3The element name and its coding are implemented according to Table 1. Table 1
Element name
Element name
Horizontal parallel line
Multi-segment broken line
Note: The above are basic elements. You can add them as needed. 4.2 Linear symbols
Polygon
Triangle
4.2.1 Linear symbols are used to describe linear features, including simple linear symbols and linear symbols composed of several graphic elements. 4.2.2 Definition format of linear symbols:
（1）*Symbol category; coding
Line type. Parameter 1, parameter 2··..
Among them, the symbol category is L1, which is used to draw simple linear symbols. Only the real length, imaginary length, line width, line length and other linear symbols are specified; the line type name and line model are implemented according to Table 2;
Line type name
Line model
（2）*Symbol category; coding
Parameter 1, parameter 2,.
《Definition Body》*
Among them, the symbol category is L2, which is used to draw combined linear symbols; the definition body can have multiple lines, and each line can be repeated as needed. Its basic format is:
Graphic element name 1, parameter 1, parameter 2..·
Dash-dot line
Dash-dot line
Graphic element name 2, parameter 1, parameter 2,
CH/T 4015--2001
4.2.3 The graphic elements of linear symbols are made and numbered according to the basic graphic elements in Table 1. It should include all graphic elements that can form complex linear symbols, and its graphic element coding shall be implemented in accordance with 5.2 of this standard. 4.3 Surface symbols
4.3.1 Surface symbols are used as the filling mode of surface features. 4.3.2 The definition format of the area symbol:
*Symbol category; code;
Boundary line model; parameter 1, parameter 2..·《Definition body》*
Wherein, the symbol category is H:
Boundary line model is implemented in accordance with Table 2;
The definition body can have multiple lines, and the definition format is: fill element 1, parameter 1, parameter 2, ...·.fill element 2, parameter 1. parameter 2,·
4.3.3 The fill element in the area symbol is a line or point symbol, and the fill element code is implemented in accordance with 5.1, and the line code is the line model in Table 2.
4.4 Other symbols
4.4.1 Other symbols include symbols used to draw multi-point positioning (the symbol structure is fixed, but the symbol size is variable and depends on the position of the positioning point); semi-scale symbols; special thematic map symbols, etc. 4.4.2 Definition format of other types of symbols:
*symbol type; code
《definition body》
Wherein, the symbol type is Y.
4.4.3 Other types of symbols are generally drawn by special programs, and their definition bodies are determined by themselves. 5 Coding of map symbols
5.1 The map symbol library should be organized according to the code, and when in use, the corresponding schematic symbols or symbol drawing methods are mainly found based on the code. 5.2 Coding of topographic map symbols
5.2.1 In principle, the coding of topographic map symbols should be consistent with the classification code of topographic map elements of the corresponding scale. The coding principle is: Area
Scale identification code
Topographic map element classification code
Among them, the identifier of 1:500, 1:1000, 1:2000 scale topographic map is A, and the topographic map element classification code is implemented according to GB14804-93;
The identifier of 1:5000, 1:10000 scale topographic map is B, and the topographic map element classification code is implemented according to GB/T15660-1995; The identifier of topographic map with a scale above 1:10000 is C, and the topographic map element classification code is implemented according to GB/T13923. 5.2.2 If the topographic map symbol does not have the corresponding scale topographic map element code, the symbol code should be added to the empty code position of the corresponding topographic map element classification code.
5.3 Element coding
5.3.1 The element used to describe linear symbols and surface symbols should be compiled uniformly and should not be repeated. The coding principle is: G××. G is the graphic element identifier, followed by a two-digit sequential digital code. 5.3.2 The codes used to describe the point symbols in various graphic elements appearing in the surface symbol should be consistent with the corresponding point symbols. 582
6 Parameters
CH/T 4015—2001
The parameters of map symbols and graphic elements can be selected and set according to the needs. The length unit of the parameter value is millimeter, and the angle unit is degree. The default ratio of symbols and graphic elements is 1.6.1 Parameters of map symbols
6.1.1 Diagram number
Diagram number should adopt the standard number of the corresponding diagram. 6.1.2 Symbol name
Symbol name is expressed in Chinese characters.
6.1.3 Line type control
Straight line/curve/arbitrary.
6.1.4 Line symbol unit length
Refers to the length of the symbol unit repeatedly configured when forming a linear symbol graphic. When a linear symbol is repeatedly configured in a symbol unit, the symbol unit length needs to be gradually lengthened, and the ratio of the starting unit length to the ending unit length is the multiple of the symbol length. 6.1.5 Repeated configuration
Repeated configuration/non-repeated configuration (referring to individual linear symbols that are configured with only one symbol throughout the entire process). 6.1.6 Representation of graphic elements at each node of the positioning line No graphic elements need to be represented at each node of the positioning line/Individual linear symbols require graphic elements to be positioned at nodes, or when the real part of the dotted line passes through a node, then graphic elements need to be represented at the node. www.bzxz.net
6.1.7 Rotation of point symbols
a) Non-rotatable: one positioning point.
b) Rotatable: one positioning point + one orientation point or one positioning point + one rotation angle
6.1.8 Scaling of point symbols
The same point symbol is enlarged or reduced according to different scales. 6.1.9 Spacing between parallel lines of linear symbols
6.1.10 The orientation of the anchor point/line of a linear symbol indicates the relationship between the drawn linear symbol and the anchor point/line. 6.1.11 Insertion of linear symbol primitives
a) Insert primitives according to a certain rule between a continuous line; b) Connect primitives/do not connect primitives;
c) Insert primitives only at the midpoint/insert primitives at both the two end points/insert primitives at both the midpoint and the two end points; d) Rotate with the direction of the connection when inserting primitives/do not rotate: e) Distance from the insertion point when inserting symbols; f) Color number of the middle line.
6.1.12 The row and column spacing of the filled primitives in the planar symbol refers to the center distance of each row and column.
6.1.13 The inclination angle of the filled halo line of the planar symbol refers to the angle between the direction of the filled halo line and the X-axis (counterclockwise is positive). 6.1.14 Spacing of lines for filling halo of planar symbol 6.1.15 Arrangement of graphic elements for filling planar symbol Halo or rectangular grid/diamond grid/irregular (hashed)/plain dyeing (filled). 583
6.2 Parameters of graphic elements
6.2.1 Deformable
CH/T 4015-2001
a) Non-deformable: refers to the graphic element that cannot be cut or deformed during configuration, but can be rotated around its positioning point. b) Deformable: refers to the graphic element that can be bent, deformed, stretched, or cut flush with the positioning line during configuration. 6.2.2 Coordinates of the positioning point of the graphic element
6.2.3 Positioning method of the graphic element relative to the endpoint The position of the graphic element is positioned relative to the left endpoint/positioned relative to the right endpoint. 6.2.4 Line width
6.2.5 Thickening factor
The instrument is used for linear symbols and refers to the degree to which the line gradually thickens. That is, the ratio of the final line thickness to the initial line thickness. 6.2.6 Fill color/line color
6.2.7 Fill mode
Refers only to the filling of closed figures in the primitive. It is divided into: filled/unfilled/horizontal halo/vertical halo/right oblique halo/horizontal and vertical orthogonal halo/oblique orthogonal halo.
6.2.8 Extensibility
The primitive stretches between the two positioning points as the symbol is enlarged/the length of the primitive remains unchanged. 6.2.9 Repeated configuration status
The primitive can/cannot appear repeatedly in the symbol drawing. 6.2.10 Relative position variability
The primitive can be changed relative to the positioning point when drawing/cannot be changed. 584
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