Standard number: GB/T 20257.4-2017
Standard name: Part 4: 1∶250 000 1∶500 000 1∶1000 000
English name: Cartographic symbols for national fundamental scale maps-Part 4: Specifications for cartographic symbols 1:2500001:500000&1:1000000 topographic maps
Standard format: PDF
Release time: 2017-10-14
Implementation time: 2018-05-01
Standard size: 12M
Introduction to the standard: Scope
This part of GB/T20257 specifies the symbols, annotations and outline decoration of various landforms and geomorphic elements shown on 1:250000, 1:500000 and 1:1000000 topographic maps, as well as the methods and basic requirements for using these symbols
This part is applicable to the surveying and mapping of 1:250000, 1:500000 and 1:1000000 topographic maps. The preparation of geographic base maps or surveying and mapping maps of similar scales can be used as a reference
2 Normative reference documents
The following documents are indispensable for the application of this document. For all dated reference documents, only the dated version applies to this document. For all undated reference documents, the latest version (including all amendments) applies to this document.
GB/T13989 Division and numbering of national basic scale topographic maps
3 General provisions
3.1 Classification of symbols
3.1.1 Scaled symbols: symbols of features whose length and width can be expressed according to scale after the features are reduced in scale. 3.12 Semi-scaled symbols: symbols of features whose length can be expressed according to scale but whose width cannot be expressed according to scale after the features are reduced in scale. In this standard, only the width dimension value is marked next to the symbol
3.13 Non-scaled symbols: symbols of features whose length and width cannot be expressed according to scale after the features are reduced in scale. In this standard, the length and width of the symbols are marked next to the symbols. GB/T20257 "National Basic Scale Map Diagram" is divided into 4 parts:
Part 1: 1:5001:10001:2000 Topographic Map Diagram
Part 2: 1:50001:10000 Topographic Map Diagram;
Part 3: 1:250001:500001:100000 Topographic Map Diagram;
Part 4: 1:250000 1:500000 1:1000000 topographic map formats
This part is Part 4 of GB/T 20257
This part replaces GB/T 202574-2007 “National basic scale map formats Part 4: 1:250000, 1:500000 1:1000000 topographic map formats”. The main changes of this part compared with GB/T20257.4-2007 are as follows
Editorial modifications have been made to the standard in accordance with the requirements of GB/T1.1-2009
21 elements have been added, including culverts; dangerous shore areas; beaches; flare venting; aquaculture farms; greenhouses and sheds; high-speed railways; village roads; subways; maglev railways and light rail lines; elevated roads; wildlife passages; ports; territorial sea baselines and territorial sea base points; pits; windbreak and sand fixation grids; debris flows; artificial steep slopes; bank ridges and earth ridges; economic crop land; and firebreaks.
The names of some symbols have been modified, including positioning basis; swamps, wetlands; ordinary houses; open-pit mining sites, illegal excavation sites; gardens
The brief descriptions of some elements have been revised, including satellite positioning continuous operation sites; dry riverbeds; lakes, ponds; dry lakes; reefs; underwater beaches; swamps, wetlands; embankments; ordinary houses; power plants (stations); open-pit mining sites, illegal excavation sites; pipeline wells (oil and gas wells); liquid and gas storage equipment; satellite ground stations; standard gauge railways; docks; gardens; grasslands. ||tt
||The classification of some elements has been rationalized, such as moving streets from residential areas and facilities to transportation.
"Open reefs" have been changed to "islands and underwater islands" that are not based on scale.
The general provisions have been revised
Some symbol size and color issues in the original standard have been revised.
This part was proposed by the National Administration of Surveying, Mapping and Geoinformation.
This part of GB/T 20257 specifies the symbols, annotations and outline decoration of various landforms and geomorphic elements shown on 1:250 000, 1:500 000 and 1:1 000 000 topographic maps, as well as the methods and basic requirements for using these symbols. This part is applicable to the surveying and mapping of 1:250 000, 1:500 000 and 1:1 000 000 topographic maps. It can be used as a reference for the preparation of geographic base maps or maps of similar scales.

ICS07.040
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National Standard of the People's Republic of China
GB/T20257.4—2017
Replaces GB/T20257.4—2007
National basic scale map diagrams
Part 4: 1:2500001:500000
1:1000000Topographic map diagrams
Cartographic symbols for national fundamental scale maps-Part4:Specifications for cartographic symbols1:2500001:500000&1:1000000topographicmaps2017-10-14Release
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of China
2018-05-01Implementation
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1Scope
Normative references
General provisions
Classification of symbols
Symbol size
Symbol positioning
Symbol configuration
Symbol usage and requirements
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Topographic map division and outline decoration
Topographic map color
Symbols and annotations||tt ||Positioning foundation
Residential areas and facilities
Pipeline:
Vegetation and soil quality
Appendix A (Normative Appendix)
Appendix B (Normative Appendix)
Appendix C (Normative Appendix)
Explanation and annotation table
Sample drawing example
Gallery decoration style
GB/T20257.4—2017
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GB/T20257 "National Basic Scale Map Diagram" is divided into 4 parts: Part 1: 1:5001:10001:2000 Topographic Map Diagram: Part 2: 15000110000 Topographic Map Diagram: Part 3: 1:250001:500001:100000 Topographic Map Diagram: Part 4: 1:2500001:5000001:1000000 Topographic Map Diagram. This part is Part 4 of GB/T20257. GB/T20257.4—2017
This part replaces GB/T20257.4—2007 National Basic Scale Map Diagram Part 4: 1:250000.1:5000001:1000000 Topographic Map Diagram". Compared with GB/T20257.4—2007, the main changes in this part are as follows: The standard has been edited in accordance with the requirements of GB/T1.1-2009. 21 elements have been added, including culverts: dangerous shore areas: beaches; flare torches; aquaculture farms: greenhouses and sheds: high-speed railways: village roads: subways: maglev rails and light rail lines: elevated roads: wildlife passages: ports: territorial sea baselines and territorial sea base points: pits: windbreak and sand fixation grids: debris flows: artificial steep slopes; bank ridges and soil pads: economic crop land: firebreaks. The names of some symbols have been modified, including positioning basic swamps, wetlands: ordinary houses: open-pit mining sites, random excavation sites: gardens.
The brief descriptions of some elements have been revised, including satellite positioning continuous operation sites: dry riverbeds: lakes, ponds: dry lakes: reefs: underwater beaches: swamps, wetlands: embankments: ordinary houses: power plants (stations): open-pit mining sites, random excavation sites: pipeline wells (oil and gas wells): liquid and gas storage equipment: satellite ground stations: standard gauge railways; docks: gardens: grasslands. The classification of some elements has been rationalized, such as moving streets from residential areas and facilities to transportation categories, and changing "open reefs" to "islands and underwater islands" that are not based on scale. The general provisions have been revised.
Some symbol size and color issues in the original standard have been modified. This part was proposed by the National Administration of Surveying, Mapping and Geoinformation. This part is under the jurisdiction of the National Technical Committee for Geographic Information Standardization (SAC/TC230). The drafting unit of this part: Surveying and Mapping Standardization Institute of the National Administration of Surveying, Mapping and Geoinformation. The main drafters of this part are Yuan Wei, Zhang Kun, Xie Xiuping, Chen Jun and Duan Luying. The previous versions of the standards replaced by this part are: - GBCHIV—302—1985. GB15944—1993; CH/T4011—1999;
—GB14512—1993:
—GB/T20257.4—2007.
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1Scope
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National basic scale map format
1:500000
Part 4: 1:250000
1:1000000 topographic map format
GB/T20257.4—2017
This part of GB/T20257 specifies the symbols, annotations and outline decoration of various landforms and geomorphic elements shown on 1:250000, 1500000 and 1:1000000 topographic maps, as well as the methods and basic requirements for using these symbols. This part is applicable to the surveying and mapping of 1:250000, 1:500000 and 1:1000000 topographic maps. The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T13989 National Basic Scale Topographic Map Division and Numbering 3 General Provisions
Classification of Symbols
3.1.1 Scaled Symbols: Symbols of features whose length and width can be expressed according to scale after the features are reduced in scale. 3.1.2 Semi-scaled Symbols: Symbols of features whose length can be expressed according to scale but whose width cannot be expressed according to scale after the features are reduced in scale. In this standard, only the width dimension value is marked next to the symbol. 3.1.3 Non-scaled Symbols: Symbols of features whose length and width cannot be expressed according to scale after the features are reduced in scale. In this standard, the length and width dimension values ​​of the symbol are marked next to the symbol.
3.2 Symbol sizeWww.bzxZ.net
3.2.1 The size value marked with a number next to the symbol is in millimeters (mm). 3.2.2 If only one size value is marked next to the symbol, it means the diameter of a circle or a circumscribed circle, the side length of an equilateral triangle or a square. If two size values ​​are listed side by side, the first number indicates the height of the main part of the symbol, and the second number indicates the width of the main part of the symbol. For the number at one end of a linear symbol, a single line refers to its thickness, and two parallel lines refer to the width of the line (streets refer to the width of the blank part). If the size value needs to be specially marked on the symbol, it will be indicated with a dotted line.
3.2.3 The thickness of the symbol's line, the length of the line segment, and the angle between the intersecting line segments, etc., if not marked, shall be subject to the symbols in this diagram. Generally, the line thickness is 0.1mm, the point diameter is 0.15mm, the line length of the non-main part of the symbol is 0.3mm (such as the short line of the steep slope), and the angle of the non-vertical cross line segment is 45° or 60°3.3 Positioning of symbols
3.3.1 If there is a point in the symbol graphic, the point is the actual center position of the feature. 3.3.2 Symbols such as circles, squares, rectangles, etc., the positioning point is at the center of their geometric figures. 1
GB/T20257.4—2017
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3.3.3 The positioning point of wide-bottom symbols (yurts, etc.) is at the center of their bottom line. 3.3.4 The positioning point of symbols composed of several graphics (berths, weather stations, etc.) is at the center point or intersection of the graphics below. 3.3.5 The positioning point of symbols without a bottom line below (caves, etc.) is the center point of the line connecting the two end points below. 3.3.6 The positioning point of other symbols (bridges, sluice gates, dams, karst funnels, etc.) that are not expressed to scale is at the center of the symbol. 3.3.7 The positioning line of linear symbols (roads, rivers, etc.) is at the center axis of the symbol: when expressed to scale, it is at the center axis of the two side lines. 3.3.8 Except for those that are expressed in true direction as specified in the brief description, all symbols are perpendicular to the southern outline. 3.4. Symbol configuration
Soil and vegetation symbols can be divided into three types according to their arrangement: a) Column type: arranged in certain rows and columns, such as grassland, economic forest, etc.; b) Hash type: not arranged in certain rows and columns, such as shrub forest, bamboo forest, etc.; c) Correspondence type: symbols are represented according to the density or position of the actual situation, such as crescent-shaped sand dunes, etc. When representing symbols, attention should be paid to showing their distribution characteristics.
When symbols are arranged, symbols are generally arranged according to the intervals represented by the diagram. When the area is large, the symbol interval can be enlarged by 1 to 3 times. Under the principle of being able to express clearly, the annotation method can be used for expression. Note: Configuration means that the symbols used are explanatory symbols and do not have positioning significance. Symbols are arranged in a hashed or columnar manner within the distribution range of the objects to indicate the category of surface objects.
3.5 Symbol usage and requirements
3.5.1 In the diagram, except for special markings, solid lines generally represent the intersection of the outer contour of the feature and the ground (except for bridges, dams, sluice gates, and overhead pipelines), dashed lines represent the projection of the underground or overhead parts of the feature on the ground, and dotted lines represent the land category range line and the feature boundary line. 3.5.2 The features represented by scale are divided into the following situations: a) The distribution range of the feature is represented by scale, and the surface color is added within its range, such as rivers, etc., or explanatory symbols or notes are configured, such as economic forests, swamps, etc. The explanatory notes are shown in Appendix A. The buildings within the distribution range of the surface feature are represented by the corresponding symbols, and symbols are configured at moderate positions within its range, such as cemeteries, etc. b) For features with unclear distribution boundaries, the range line is not represented, but explanatory symbols are configured within its range, such as saline-alkali land, etc. c)
For large-area features on the map, such as airports, the diagram does not specify symbols. Corresponding symbols such as houses, roads, and green spaces are used to represent internal features, and proper names are annotated within their scope. 3.5.3 When two features overlap, the part of the lower layer covered by the upper layer is disconnected according to the projection principle, and the upper layer remains intact. 3.5.4 The sizes of various symbols are specified according to the map sheet with medium density content of the topographic map. In order to make the topographic map clear and easy to read, in addition to allowing symbols to be crossed and combined, the interval between each symbol (including the interval between the contour line and the configured non-scale symbol) should generally not be less than 0.3mm. If the density of features in some areas is too large and cannot be accommodated on the map, it is allowed to slightly reduce the size of the symbol (reduction rate not greater than 0.8) or move the secondary feature symbol. When the symbols of linear features represented by double lines are very close, they can be represented by collinearity. When point features overlap with other features such as houses, roads and water systems, the symbols of other features can be interrupted with a spacing of 0.3mm to maintain the integrity of independent symbols. 3.5.5 When the features are dense and the positions of the features on the map conflict, the principle of handling the avoidance relationship is generally: when the natural geographical features conflict with the artificial building features, move the artificial building features; when the main features conflict with the secondary features, move the secondary features; when the independent features conflict with other features, move the other features. 3.5.6 For some buildings and structures on the ground, which are not specified in the diagram and are not convenient to classify, the outline or range of the object can be represented and annotated. The outline of the feature is represented by a 0.1mm solid line, and the distribution range of the feature and the boundary of the land class are represented by the land class boundary symbol.
3.5.7 The digital annotations such as width, depth, and relative height beside the symbol are marked to the whole meter (m). For various numerical descriptions, unless otherwise specified, "greater than" includes the number itself (such as greater than 3m, including 3m), and "less than" does not include the number itself. The meanings of "above" and "below" in the various symbol level descriptions are the same as above. 2
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3.5.8 Examples of symbol representation and coordination are shown in Appendix B. Topographic map framing and outline decoration
Topographic map framing numbering shall be implemented in accordance with GB/T13989. For gallery decoration, see Appendix C.
Topographic map color
GB/T20257.4—2017
1:250000, 1:500000, 11000000 Topographic maps should use cyan, magenta, yellow and black (CMYK) four colors, and color separation should be carried out according to the specified color values. When printing, special color printing can also be used as needed. 3
GB/T2025 7.4-—2017
4Symbols and annotations
Symbol name
Positioning basis
Triangulation point
Satellite positioning continuous operation
Station
495——elevation
Independent astronomical point
24——elevation
Tropic of Cancer
Surface river
Name of a river
Underground river section with population
Disappearing river section
Seasonal river
Dry riverbed (Dry dripping river)
aBeijing-Hangzhou Grand Canal
b. Other canals
aMain canal
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Symbol style||tt| |1:250000
1:500000
1:1000000
Symbol enlargement
Symbol color value
Surface color C30
Surface color C30
Surface color C30
M40Y100K30
4.1 Positioning basis
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Brief description
GB/T20257.4—-2017
The positioning basis includes mathematical basis and survey control points. The mathematical basis mainly refers to the longitude and latitude of the map gallery line, coordinate grid line, etc., and its representation method is shown in Appendix C. The elevation of the survey control point is annotated to meters. 4.1.1
Use National-level triangulation points and precision traverse points measured by triangulation or precision traverse methods. Class A global navigation satellite system (GNSS) points measured by satellite positioning technology. 4.1.2
4.1.3 Control points whose geographic coordinates and azimuths are directly measured by astronomical observation methods. The northernmost latitude where the sun can shine vertically, that is, 23°27 north latitude. 4.1.4
4.2 Water system
Including rivers, ditches, lakes, reservoirs, oceans, water conservancy elements and ancillary facilities, etc. 4.2.1 Natural rivers with water all year round on the ground. If the width of the river is greater than 0.4mm, it is represented by a double line according to the scale. If it is less than 0.4mm, it is represented by a single line with a gradient of 0.1mm~0.4mm.
4.2.2 The entrance and exit holes on the ground of the river section flowing underground or through the cave. The arc symbol indicates the location of the water inlet and outlet. 4.2.3 Rivers that flow through swamps, sandy areas, etc., without obvious riverbeds or areas where surface water disappears. 4.2.4 Natural rivers with seasonal water.
Seasonal rivers with a width greater than 0.4mm are represented by double dashed lines according to the scale. Rivers with a width less than 0.4mm are represented by single dashed lines with a gradual change of line thickness from 0.1mm to 0.4mm.
Seasonal rivers represented by single lines can have a symbol with a real length that gradually changes from 0.5mm to 2.0mm according to the length of the river, and a blank part that gradually changes from 0.3mm to 0.5mm.
4.2.5 Riverbeds with water for a short period of time after precipitation or snowmelt, or river channels left after river diversion. Dry riverbeds with a width of less than 0.4mm on the map are indicated by a single dotted line with a line thickness of 0.1mm~0.4mm; those with a width greater than 0.4mm are indicated by double lines according to the scale; those with a width greater than 1mm should be indicated by contour lines and corresponding soil symbols. The real length of the dry riverbed symbol represented by a single line can be gradually changed to 0.5mm2.0mm according to the length of the dry riverbed, and the blank part can be gradually changed to 0.3mm~0.5mm. The bank of the dry riverbed can be indicated with gully symbols according to the side erosion of the water. 4.2.6 Artificial waterways excavated across river basins for water diversion and navigation. The Beijing-Hangzhou Grand Canal is indicated by symbol a. Other canals are indicated by symbol b. The South-to-North Water Diversion Project should be named or annotated with the "South-to-North Water Diversion Project".
4.2.7 Artificially constructed waterways for irrigation, water diversion and drainage. Channels with a width greater than 20m are indicated by dry channel symbols. When the channel flow direction is difficult to determine, the flow direction symbol should be indicated. GB/T20257.4—2017
Symbol name
Karez
Water conveyance aqueduct
a. According to scale
b. Not according to scale
Water conveyance tunnel
Lakes and ponds
Reduction——Water quality
a. Fish pond in base pond area
Seasonal lake
a, according to scale
25000——Reservoir capacity (10,000
cubic meters)
Cement——Building materials
67———Elevation of dam crest
103-Length of dam (m)
al. Large
a2. Medium
a3.Small
b. Not to scale
b1. Medium
b2. Small
c. Reservoir in construction
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Symbol style
1:250000
1:500000
0.54.0.15
Most cement
1:1000000
Da reservoir
Symbol enlargement
Symbol color value
M40Y100K30
Surface color C30
Note C100
Surface color C30
M40Y100K30
Surface color:
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