This part of GB/T 20258 specifies the content structure and element description of the 1:25000, 1:50000, 1:100000 basic geographic information element data dictionary. GB/T 20258.3-2006 Basic Geographic Information Element Data Dictionary Part 3: 1:25 000 1:50 000 1:100 000 Basic Geographic Information Element Data Dictionary GB/T20258.3-2006 Standard download decompression password: www.bzxz.net
This part of GB/T 20258 specifies the content structure and element description of the 1:25000, 1:50000, 1:100000 basic geographic information element data dictionary.

ICS07.040
National Standard of the People's Republic of China
GB/T20258.3—2006
Data dictionary for fundamental geographic information features
Part 3: 1: 250001: 50000
1: 100000Data dictionary for fundamental geographic information features-Part 3: data dictionary for fundamental geographic informationfeaturesf1:250001:500001:100000scale2006-12-05Release
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
2007-05-01Implementation
Normative references
Terms and definitions
Data dictionary structure and content
Feature name
Feature description
Feature classification code
Feature attribute table
Geometric representation
Geometric representation example
Cartographic representation example
Related elements
4.10 Relationships
5 Feature data dictionary description
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Appendix A (Normative Appendix) 1:250001:500001:100000 Basic geographic information element data dictionary Element classification code index
Chinese index:
GB/T20258 "Basic geographic information element data dictionary" is divided into 4 parts: Part 1: 1:5001:10001:2000 Basic geographic information element data dictionary; Part 2: 1:50001:10000 Basic geographic information element data dictionary; GB/T20258.3—2006
Part 3: 1:250001:500001:100000 Basic geographic information element data dictionary; Part 4: 1:2500001:5000001:1000000 Basic geographic information element data dictionary. This part is Part 3 of GB/T 20258. This part is formulated based on the current needs of my country for the collection, database construction, mapping and application of basic geographic information data at 1:25000, 1:50000 and 1:100000.
Appendix A of this part is a normative appendix.
This part is proposed and managed by the State Administration of Surveying, Mapping and Geoinformation. The drafting unit of this part is the Surveying and Mapping Standardization Institute of the State Administration of Surveying, Mapping and Geoinformation. The main drafters of this standard are Duan Yihong, Lv Yuxia, Li Jianli, Yuan Wei, Xiao Xuenian, Zhang Kun and Ma Xiaoping. Scope
Basic geographic information element data dictionary
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GB/T20258.3—2006
Part 3: 1:250001:500001:100000Basic geographic information element data dictionary
This part of GB/T20258 specifies the content structure and element description of the 1:25000, 1:50000, 1:100000 basic geographic information element data dictionary.
This part is applicable to the production, database construction, update and maintenance of basic geographic information data at the scale of 1:25000, 1:50000, 1:100000. The analysis, application and mapping output of basic geographic information data at the scale of 1:25000, 1:50000, 1:100000 can be referred to for implementation. 2 Normative references
The clauses in the following documents become clauses of this part through reference in this part of GB/T 20258. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this part.
GB/T13923—2006 Classification and codes of basic geographic information elements GB/T20257.3—2006 National basic scale map diagram Part 3: 1:250001:500001:100000 Topographic map diagram
3 Terms and definitions
The following terms and definitions apply to this part of GB/T 20258. 3.1
Entity
A phenomenon in the real world. It cannot be further subdivided into the same type of phenomenon. 3.2
Feature
Abstract of a real-world phenomenon.
Note: A feature can appear as a type (e.g., a lake) or as an instance (e.g., Dongting Lake). 3.3
Feature attribute
Qualitative and quantitative characteristics of a feature. [ISO19101]Note 1: A feature attribute may appear as a type or as an instance. When there is only one meaning, either the feature attribute type or the feature attribute instance is used.
Note 2: A feature attribute shall have a name, a data type, and a value domain associated with it. A feature attribute of a feature instance shall have an attribute value obtained from the value domain.
Attribute valueattributevalue
Assigns a specific value to an attribute.
GB/T20258.3—2006
Pointpoint
Zero-dimensional geometric primitive.
Lineline
One-dimensional geometric primitive.
Surface polygon
Two-dimensional geometric element.
4 Data dictionary structure and content
4.1 Structure
The data dictionary structure adopts a table format, and the content described includes feature name, feature description, feature classification code, feature attribute table, geometric representation, geometric representation example and cartographic representation example, related features and relationships. 4.2 Feature name
Formal name of the feature. The feature name in this section is consistent with GB/T13923-2006. 4.3 Feature description
Description of the feature form, function or characteristics, etc., used to distinguish or define the feature. 4.4 Feature classification code
The feature classification code adopts GB/T13923-2006. 4.5 Feature attribute table
Lists the relevant attribute items of the feature, and describes them from the aspects of attribute name, attribute description, data type and field requirements, attribute value range or example, constraints/conditions, and remarks. Note: The attribute items listed in the attribute table are not complete, and users can expand them as needed. 4.5.1 Attribute name
The name of the feature attribute item.
4.5.2 Attribute description
Explanation of the attribute meaning. All measurements must indicate the unit. 4.5.3 Data type and field requirements
Specify the data type and field width of the attribute item. The data types are divided into character type, integer type, long integer type, floating point type, date type, etc. Note: The field byte width of character type and integer data is described by a natural number: the field width of floating point data is represented by a decimal, where the integer part represents the number of digits of the integer part of the floating point number, and the decimal part represents the number of digits of the decimal part of the floating point number. For example, 15.2 means that the integer part of the floating point number is 15 digits and the decimal part is 2 digits. 4.5.4 Attribute value range or example
The attribute value range is the range of possible values ​​of the attribute item. If the values ​​of an attribute item can be listed in full by simple enumeration, list all its values ​​and separate them with "/"; if they cannot be listed in full by simple enumeration, list typical examples and put the example values ​​in "". 4.5.5 Constraints/Conditions
Specify that the attribute item is a mandatory attribute or a conditional optional attribute of the feature. When the attribute item is a mandatory attribute of the feature, it is represented by the letter "M"; when it is a conditional optional attribute, it is represented by the letter "C". 4.5.6 Remarks
Content that needs to be specially explained.
4.6 Geometric Representation
Describe the geometric features, graphic codes, representation methods and associated attributes of the request. 4.6.1 Geometric Features
Features are divided into four types according to their geometric features: point features, line features, surface features and composite features. KANIKAca-
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Point elements are used to represent geographical elements without area or length, or elements represented by points at a certain map scale. Line elements are used to represent geographical elements with a certain length but no area, or elements represented by lines at a certain map scale. Area elements are used to represent geographical elements with a certain length and area, or elements represented by surfaces at a certain map scale. Composite elements are composed of point elements, line elements, surface elements and auxiliary cartographic elements. Auxiliary cartographic elements refer to auxiliary points, lines and surfaces added to ensure the correctness of map symbolization. Elements can have one or more geometric representations according to their geographical scale, such as: rivers can be represented by line elements or surface elements according to specific circumstances.
4.6.2 Graphic Codes
The numbers 1, 2, 3 and 4 are used as the graphic codes for point elements, line elements, surface elements and auxiliary cartographic elements respectively. Users can also determine them according to actual needs.
4.6.3 Representation method
4.6.3.1 Representation method of point elements
There are three forms of representation of point elements: marked points, positioning points, and directed points. Marked points refer to the representation form of point elements without corresponding entities, such as elevation points, relative height points, special elevation points, water depth points, etc. Positioning points refer to the representation form of point elements with corresponding entities, such as lighthouses and bacon. Directed points refer to the representation form of point elements with directionality, such as springs and milestones. The "direction" attribute item should be defined in the attribute table. 4.6.3.2, Representation method of line elements
There are three forms of representation of line elements: line, centerline, and directed line. Line refers to the representation form of line elements without corresponding entities, such as contour lines, land class boundaries, and boundary lines. Centerline refers to the representation form of line elements with corresponding entities, such as subways, mechanized farming roads, cable bridges, tunnels, etc. Directed lines refer to the expression of line elements with directionality, which are lines that require collection in a certain direction, such as single-line rivers, field ridges/road cuts/ditch cuts/embankments, boundaries of natural and cultural protection areas, etc. 4.6.3.3 Methods of representing surface elements
Surface elements can be represented in two forms, contour surface and range surface. Contour surface is used to represent surface elements with clear boundaries, such as a single house represented according to scale. Range surface is used to represent surface elements without clear boundaries, such as a group of oil tanks. 4.6.3.4 Methods of representing composite elements
Combined by points, lines, surfaces or points, lines and surfaces of auxiliary mapping. 4.6.4 Attributes
Attributes that elements need to be associated with.
4.7 Geometric Representation Examples
Give examples of the geometric relationship between this element or this element and other related elements, where "" represents a marked point or a positioning point, " represents a directed point; "
4.8 Cartographic Representation Examples
" represents a directed line; this element is represented in red, and related elements are represented in black. Give examples of cartographic representation of this element or this element and other related elements. Cartographic representation is based on GB/T20257.3-2006. 4.9 Related Elements
Give possible topological related elements of this element. 3
GB/T20258.3—2006
Note: Due to the complexity of the real world and the limitations of the data model in expressing the real world, the listed related elements may not be all of them. Related elements. Users can supplement related elements and their relationships according to specific circumstances. 4.10 Relationship
Describe the topological spatial relationship between this element and related elements. Topological spatial relationship types include: connection, overlap, containment, separation, and intersection. This section only describes the connection, overlap, and containment relationships that require data processing.
4.10.1 Connection
When this element and the related element intersect only at the boundary, it is called a connection relationship. Connection relationships include:
a) points are at the endpoints of the line, and points are on the edge of the surface; b) lines and lines have a common node, one or two endpoints of the line are on the edge of the surface, the line is on the edge of the surface, etc.; c) surfaces and surfaces have a common node or a common edge. Various examples of connection relationships are shown in Table 1.
Related elements||tt| |4.10.2 Overlap
No connection relationship
When this element partially overlaps with the related element, it is called an overlapping relationship. Overlapping relationships include:
a) lines partially overlap;
b) surfaces partially overlap.
Various examples of overlapping relationships are shown in Table 2.
4.10.3 Containment
No overlapping relationship
No overlapping relationship
No overlapping relationship
Related elements
No overlapping relationship
No overlapping relationship
When this element completely contains or is contained in the related element, it is called a containment relationship. Containment relationships include:
a) a point is on a line but not the endpoint of the line, and the point is inside a surface; b)
One line is part of another line. points, a line is inside a surface; a surface is completely inside another surface or is part of another surface. Various examples of inclusion relations are shown in Table 3.
Related elements
No inclusion relation
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No weight relation
No overlapping relation
GB/T20258.3—2006
4.10.4 Examples
Table 4 gives examples of various relations.
Start and end point of route and highwaywwW.bzxz.Net
Toll station and toll highway
Boundary stakes and administrative areas
Water depth points and lakes
Description of element data dictionary
Detailed description of each element data dictionary is shown in Appendix A. Relationship
Rivers, roads and boundaries
Highways and ramps
Roads and bridges
Rivers and reservoirs
Bath contours and waters
Administrative regions at the same level
Historic sites, ruins and vegetation
National administrative regions include
Administrative regions at all levels,
Dry beaches and sea areas
1:25000
Feature name Geodetic origin
Appendix A
(Normative appendix)
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1:100000 Basic geographic information element data dictionary 1:50000
Feature description The national horizontal control network, that is, the starting point of the 1980 Xi'an coordinate system. Feature classification code
110101
Attribute table
Attribute name
Geometric representation
Geometric features
Attribute description
Feature classification code and seventh
Graphic code
Geometric representation example
Related features
Data type
Field requirements|| tt||Long integer 10
Representation method
Anchor point
Attribute value range or example
1101011
Cartographic representation example
Constraint/
GB/T20258.3—2006
Feature name
Feature description
Triangulation point
Plane control point determined by triangulation method. Feature classification code 110102
Attribute table
Attribute name
Coordinate system
Geometric latitude
Geometric longitude
Elevation datum
Geometric representation
Geometric features
Attribute description
Feature classification code and seventh
Graphic code
Name of triangulation point
Level of triangulation point
Coordinate system of triangulation point
Geometric latitude of triangulation point (°)
Geodetic longitude of triangulation point (°)
Height of triangulation point (m)
Height datum of triangulation point
Graphic code
Geometric representation example
Related elements
Data type
Field requirements
Long integer type 10
Character type 60
Character type 10
Character type 30
Floating point type 4.8
Floating point type 4.8
Floating point type 4.2
Character type30
Representation method
Positioning point
Attribute value range or example
1101021
First class/Second class/Third class/
Fourth class/5\/10\
Constraint/
Code, point name, grade, coordinate system, geodetic latitude, geodetic longitude, elevation, elevation datum Cartographic representation example
Element name Level origin
Element description The starting point of the national elevation control network, that is, the 1985 national elevation datum. Feature classification code 110201
Attribute table
Attribute name
Tide gauge station
Geometric representation
Geometric features
Attribute description
Feature classification code and seventh
Graphic code
Elevation of level origin (m)
Name of tide gauge station
Graphic code
Geometric representation example
Related features
Data class Type
Field requirements
Long integer 10
Floating point 4.4
Character 60
Representation method
Location point
Attribute value range or example
1102011
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Constraints/
Code, elevation, tide station
Cartographic representation example
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