Some standard content:
ICS07.040
National Standard of the People's Republic of China
GB/T18315—2001
Series and basic requirements of digital topographic maps
Series and basic requirements of digital topographic maps2001-03-05Promulgated
Implementation on 2001-09-01
State Administration of Quality and Technical Supervision
GB/T18315--2001
Cited standards
3 Definition
4 Classification
Product marking
Basic requirements
GB/T18315-2001
The rapid development of geographic information industry has promoted the faster entry of digital surveying and mapping products into many production and life fields. To meet the needs of production and application of digital topographic maps, this standard is based on the national basic scale topographic map series and specifies the classification, naming, content and basic requirements of digital topographic maps. This standard is part of the digital topographic map product standard. This standard is proposed by the State Administration of Surveying, Mapping and Geoinformation.
This standard is under the jurisdiction of 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: Cheng Yanhui, Deng Guoqing, Duan Yihong, Xiao Lebin. 1 Scope
National Standard of the People's Republic of China
Series and basic requirements of digital topographic maps
Series and basic requirements of digital topographic maps This standard specifies the classification, product marking, composition content and basic requirements of digital topographic maps. GB/T18315--2001
This standard applies to digital topographic maps of 1:500, 1:1000, 1:2000 and corresponding to national basic scale topographic maps. 2 Reference 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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T7929—1995 11500, 1:1000, 112000 Topographic map format GB/T13923 1992 Classification and code of basic land information data GB/T13989—1992 National basic scale topographic map division and numbering GB14804—1993 1:500, 1:1000, 1:2000 Classification and code of topographic map elements GB/T17798—1999 Geospatial data exchange format CH/T1005-2000 Naming rules for basic geographic information digital product data files 3 Definition
Digital topographic map: According to the requirements of topographic map representation, the topographic map elements are processed by computer, and the digital product containing metadata and data bodies is organized and stored in the form of vector or raster data and can be output in graphical form. 4 Classification
4.1 Digital topographic map series
Digital topographic map series are divided into main scale series based on scale range, mainly 1:500, 1:2000, 1:10000, 1,50000, 1:250000, 1:1000000. Other scale digital topographic maps can be derived from main scale digital topographic maps or directly adopt adjacent scales.
4.2 Code
Digital topographic maps are classified according to data form. They are divided into two types of products: vector digital topographic maps and raster digital topographic maps, with codes DV and DR respectively.
4.3 Confidentiality
Digital topographic maps should include confidentiality requirements, and the classification of confidentiality shall be implemented in accordance with relevant national confidentiality regulations. 5 Product marking
Product marking is stipulated as follows: Product name + Classification code + 10 + Frame number + Standard number Example: The product marking of the vector digital topographic map with frame number J50C001001 using this standard is:
Approved by the State Administration of Quality and Technical Supervision on March 5, 2001 Implemented on September 1, 2001
GB/T18315—2001
Digital topographic map DVJ50C001001GB/T18315—20016 Composition
Digital topographic map consists of frame products and auxiliary files. Each frame product consists of metadata, data body, finishing data and other related files. Auxiliary files may include "Instructions for Use", etc., but auxiliary files are not a necessary part of digital topographic map products. Metadata is a separate file used to record information on data sources, data quality, data structure, positioning reference system, product ownership, etc.; data bodies are used to record the geometric position, attributes, topological relationships, etc. of the key elements of topographic maps. The User Manual is used to help, explain and guide users in using digital topographic map products. It may include layering regulations, element coding, attribute lists, special agreements, help files, copyrights, user rights, etc. 7 Basic requirements
7.1 Positioning reference system
7.1.1 Plane coordinate system
The plane coordinate system adopts a plane rectangular coordinate system with the "1980 Xi'an coordinate system" as the geodetic datum, Gauss-Kruger projection or orthogonal conformal conic projection. In special cases, an independent coordinate system may be used for 1:500~1*2000. 7.1.2 Projection method
1:1000000 digital topographic map adopts orthogonal conformal conic projection. The digital topographic map of 125000～1:500000 adopts Gauss-Kruger projection, divided into 6° zones. The digital topographic map of 1:5000～1:10000 adopts Gauss-Kruger projection, divided into 3° zones. The digital topographic map of 1:500~1:2000 adopts Gauss-Kruger projection, divided into 3 zones. You can also choose any longitude as the Gauss-Kruger projection of the central meridian.
7.1.3 Elevation datum and depth datum
The elevation datum adopts the "1985 National Elevation Datum". In special cases, 1:500～1:2000 can adopt an independent elevation system. The depth datum generally adopts the theoretical lowest tide surface.
7.2 Framing and numbering
The framing and numbering of the digital topographic map of 1:5000～1:1000000 shall be implemented in accordance with GB/T13989. The framing and numbering of 1:500~1:2000 digital topographic maps shall be in accordance with GB/T7929. 7.3 Features
7.3.1 Loss-of-scale digital topographic maps
7.3.1.1 Classification and coding
If digital topographic map elements need to be classified and coded, the following methods can be used: a) Classification and coding of 1:500~1:2000 digital topographic map elements shall be in accordance with GB14804; b) Classification and coding of 1:5000~1:1000000 digital topographic map elements shall be in accordance with GB/T13923. 7.3.1.2 Layering
For digital topographic maps, if elements are stored and managed in layers, the following layering principles should be followed: a) The element classification standards specified in 7.3.1.1 should be used as a reference and coordinated with them; b) Elements of the same category can be further divided into layers as needed; c) In special cases, different categories can be combined into one layer; d) In special cases, some elements from different categories can be combined into one layer; e) The layer of annotation depends on user needs and software functions; f) Elements other than the inner outline used for gallery decoration should be divided into layers. All line drawings, annotation texts, instructions, legends, etc. and rectangular coordinate lines, longitude and latitude lines, etc. within the inner gallery lines should be layered independently; g) The geometric characteristics of the elements and the management of topological relationships should be taken into account; h) The layer names should be named in Chinese characters. In actual applications, layer name codes should be used. Layer name codes can be expressed in pinyin or full English names or abbreviations and Arabic numerals can be used in addition.
GB/T18315—2001
i) The layering scheme should be described in the "Instructions for Use" and metadata files. 7.3.2 Raster digital topographic map
7.3.2.1 Resolution
If output is required, the output resolution is 250~300dpi. The scanning resolution is 500~600dpi. 7.3.2.2 Graphics and color quality
Graphics should be clear without blurring or virtual breaks. If it is a map, the color must be uniform and the color value should be correct. 7.4 Symbol representation
The symbols in the symbol library used for digital topographic maps shall be implemented in accordance with the regulations of the topographic map format of the corresponding scale. In special cases, the alternative symbols used must be explained in the "Instructions for Use". 7.5 Accuracy requirements
7.5.1 Position accuracy
7.5.1.1 Planar position accuracy
The mean error of the on-map position of a feature point to the nearest field control point shall not be greater than that specified in Table 1. In areas with special difficulties, the mean error of the on-map position of a feature point to the nearest field control point shall be relaxed by 0.5 times according to the terrain category. Table 1
Topographic map scale
1:500~1:2000
1:5000~1:100000
1125000~1*1000000 (compilation and mapping method)
7.5.1.2 Elevation accuracy
Flat land, hilly land
Mountainous land, high mountainous land
The original map used for compilation and mapping should meet the accuracy requirements mm
The elevation error of the elevation annotation point and contour line to the nearest field control point shall not be greater than that specified in Table 2. In special difficult areas, the elevation error can be relaxed by 0.5 times according to the terrain type.
1:2000
1:5000
1:10000
Annotation point
Contour line
Annotation point
Contour line
Annotation point
Contour line
Annotation point
Contour line
Annotation point
Contour line
Chump
Alpine land
1+25000
1+50000
1 :100000
Annotation point
Contour line
Annotation point
Contour line
Annotation point
Contour line
1:100000~1:1000000
7.5.1.3 Maximum error
GB/T18315—2001
Table 2 (end)
Hillary land
The original map used for compilation and drawing should meet the accuracy requirements. This standard stipulates that twice the mean error is the maximum error. 7.5.2 Edge connection accuracy
7.5.2.1 In terms of geometric figures, the edge features of adjacent map sheets should be logically guaranteed to be seamless.
7.5.2.2 If the required attributes are to be recorded, the attributes of the adjacent map sheets should be consistent. 7.5.2.3 If the topological relationship between the elements is to be established, the topological relationship of the adjacent map sheets should be consistent.
7.5.3 Other precisions
Digital topographic map products should also meet the requirements of data source accuracy, attribute accuracy, logical consistency, and integrity of products of corresponding scales. 7.6 Basic contour intervals and elevation annotation point density 7.6.1 Basic contour intervals (except 1:1000000 digital topographic maps) are divided according to terrain categories and implemented in accordance with Table 3. Generally, only one basic contour interval is used in a map.
Map scale
1:1000
1:2000
115000
1+10:000
1:25000
11100000
11250000
1:500000
20(10)
Hillary land
Mountainous land
1:1000000The contour interval of the digital topographic map is: from 0 to 2000m in height, the contour interval is 200m, and a 50m contour line is added; above 2000m in height, the contour interval is 250m.
When the terrain is very flat or the map requires it, the basic contour interval can be selected from the values in brackets, and its elevation accuracy is determined by proportional conversion. GB/T18315—2001
7.6.2 The density of elevation annotation points is 8 to 20 per 100 cm2 on the map. 7.7 Storage
Digital topographic map products use tile products as storage units and use storage media that can be read and written by computers. 7.8 Packaging mark
The packaging mark of digital topographic map products includes the name, tile product mark, publishing unit, publication date, copyright ownership, publication number, trademark and other contents.
7.9 Distribution format
The distribution of digital topographic map products should include metadata and data body. The metadata record format shall be implemented in accordance with relevant national standards, and the data body record format shall be implemented in accordance with GB/T17798.
The naming of metadata files and data body files shall be implemented in accordance with CH/T1005. TYTKON
GB/T18315-2001
People's Republic of China
National Standard
Digital Topographic Map Series and Basic Requirements
GB/T18315—2001
Published by China Standards Press
No. 16, Sanlihebei Street, Fuxingmenwai, Beijing
Ministry Code: 100045
Tel: 6852394668517548
China Standards Press Qin Printed by Huangdao Printing Factory, issued by Beijing Xinhua Bookstore
Sold by Xinhua Bookstores everywhere
Format 880×12301/16 Printing sheet 3/4 Word count 14,000 words First edition in May 2001 First printing in May 2001 Print run 1-3000
Book number: 155066·1-17686
Website: bzcbs.com
Copyright reserved
Infringements must be investigated
Report phone number: (010>685335339 Distribution format
The distribution of digital topographic map products should include metadata and data body. The metadata record format shall be implemented in accordance with relevant national standards, and the data body record format shall be implemented in accordance with GB/T17798.
The naming of metadata files and data body files shall be implemented in accordance with CH/T1005. TYTKON
GB/T18315-2001
People's Republic of China
National Standard
Digital Topographic Map Series and Basic Requirements
GB/T18315—2001
Published by China Standards Press
No. 16, Sanlihebei Street, Fuxingmenwai, Beijing
Ministry Code: 100045
Tel: 6852394668517548
China Standards Press Qin Printed by Huangdao Printing Factory, issued by Beijing Xinhua Bookstore
Sold by Xinhua Bookstores everywhere
Format 880×12301/16 Printing sheet 3/4 Word count 14,000 words First edition in May 2001 First printing in May 2001 Print run 1-3000
Book number: 155066·1-17686
Website: bzcbs.com
Copyright reserved
Infringements must be investigated
Report phone number: (010>685335339 Distribution format
The distribution of digital topographic map products should include metadata and data body. The metadata record format shall be implemented in accordance with relevant national standards, and the data body record format shall be implemented in accordance with GB/T17798.
The naming of metadata files and data body files shall be implemented in accordance with CH/T1005. TYTKON
GB/T18315-2001
People's Republic of China
National Standard
Digital Topographic Map Series and Basic Requirements
GB/T18315—2001bzxZ.net
Published by China Standards Press
No. 16, Sanlihebei Street, Fuxingmenwai, Beijing
Ministry Code: 100045
Tel: 6852394668517548
China Standards Press Qin Printed by Huangdao Printing Factory, issued by Beijing Xinhua Bookstore
Sold by Xinhua Bookstores everywhere
Format 880×12301/16 Printing sheet 3/4 Word count 14,000 words First edition in May 2001 First printing in May 2001 Print run 1-3000
Book number: 155066·1-17686
Website: bzcbs.com
Copyright reserved
Infringements must be investigated
Report phone number: (010>68533533
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