Some standard content:
GB/T17278—1998
This standard is formulated for the first time in China. This standard is one of the standards related to digital topographic map products and is the framework of digital topographic map product standards.
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: China Academy of Surveying and Mapping. The main drafters of this standard: Shi Weijun and Su Shanwu. 354
GB/T17278—1998
The development of geographic information system technology has broadened the application field of surveying and mapping information, promoted the development of geographic information industry, and digital surveying and mapping products are rapidly entering the production and life fields. Digital topographic maps are flexible to use, easy to extract information and process data, with various forms and short update cycles. In order to meet the needs of production and application of digital topographic map products in my country, this standard stipulates the classification, naming, composition and other related issues of digital topographic map products from the overall digital topographic map product series. 355
1 Scope
National Standard of the People's Republic of China
Outline for the digital topographic map productsGB/T 17278—1998
This standard applies to the formulation of digital topographic map product standards at all levels of scale and the development and production of products. Other digital map products may refer to it for implementation. The topographic maps described in this standard include topographic maps with a scale of 1:500 to 1*1000000. 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 will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB13989-92 National basic scale topographic map division and numbering GB14804-931:5001:10001:2000 Classification and code of topographic map elements GB/T15660-19951:50001:100001:250001:500001:100000 Classification and code of topographic map elements
GB13923-92 National basic information data According to classification and code GB/T7929-19951:5001:100012000 Topographic map diagram GB5791-93150001:10000 Topographic map diagram GB15944-19951:250000 Topographic map compilation specification and diagram ZBA79001-871:500000 Topographic map compilation specification and diagram 3 Definition
This standard adopts the following definitions.
Digital topographic mapdigital topographic map A topographic map that represents topographic map elements in digital form. 4 Classification and name
4.1 Classification
4.1.1 Classification by scale series
a) 1500
b) 1:1 000
c) 1:2 000
d) 1 : 5 000
e) 1110000
f) 1:25 000
g) 1:50 000
h) 1:100000
Approved by the State Administration of Technical Supervision on March 20, 1998 356
Implementation on December 1, 1998
1) 1 : 250 000
j) 1:500000
k) 1 t 1 000 000
4.1.2 Classification by element content
a) All elements
b) Specified elements
4.1.3 Classification by spatial data representation
a) Vector method
b) Raster method
c) Vector-raster hybrid method
4.1.4 Classification by scope of use
a) Domestic
b) International
4.2 Product name
Digital topographic map products are named as follows: GB/T 17278—1998
“China” + Expression method + “digital topographic map” + (scale) Example:wwW.bzxz.Net
a) China raster digital topographic map (1:1000000)b) China volume digital topographic map (1:250000)5 Composition
Digital topographic map products consist of data body, product manual, and demonstration software (optional). They are circulated in society using a certain storage medium and a certain form of packaging.
5.1 Data body
5.1.1 Basic data
5.1.1.1 The basic data of digital topographic map products include survey control points, settlements, transportation, boundaries, land water systems, marine elements, landforms, soil quality, vegetation, pipelines, fences and other geographic information data. The selection and synthesis of geographical elements of digital topographic map products refer to the corresponding scale topographic map mapping or compilation specifications and diagrams.
5.1.1.2 Data quality elements include data source, location accuracy, attribute accuracy, time accuracy, logical consistency and integrity. 5.1.1.3 The classification and coding of geographic information data of vector digital topographic map products shall comply with relevant national standards. The coding of feature attribute information shall refer to relevant national standards or industry standards. 5.1.2 Data spatial positioning reference system
Use a national unified plane coordinate system and elevation system. Relatively independent plane coordinate systems can be used in local areas. Select map projection according to the corresponding scale topographic map compilation specifications and diagrams, and longitude and latitude can also be used for small and medium scales. 5.1.3 Descriptive data
5.1.3.1 Information such as map number, map name, geographical scope, administrative area, original map scale, etc. The framing and numbering of 1:5000～1:1000000 digital topographic maps shall comply with the national standard GB13989. The framing and numbering of 1:500～1:2000 digital topographic maps shall comply with the framing and numbering methods specified in GB/T7929.
5.1.3.2 Positioning reference system and its parameters, map projection and its parameters, measurement units and other information. 5.1.3.3 Data acquisition methods and other information. Data acquisition methods include field measurement, synaesthesia, photogrammetry, topographic map tracking digitization, scanning digitization, etc.
5.1.3.4 Grid unit size, number of rows and columns, encoding method and other information of raster digital topographic map products. 5.1.3.5 Data accuracy and quality evaluation, data cutoff time, product production time, update time and other information. 357
GB/T17278—1998
5.1.3.6 Product production unit, product maintenance and update unit and other information. 5.1.4 Data format
Digital topographic map products should adopt standard data exchange format. 5.2 Product manual
5.2.1 Product manual should generally include the following contents: overview, data positioning reference system and its parameter description, map projection name and its parameter description, basic data content description, data format description, classification and coding description, product quality description, update method, copyright description, confidentiality requirements and usage scope, etc.
5.2.2 Product manual can be printed in book form, or it can be a computer file or as part of the online help of demonstration software. 5.3 Demonstration software
5.3.1 Digital topographic map products can carry demonstration software, which should have basic query and retrieval functions. 5.3.2 Demonstration software needs to have software instructions. The instructions for demonstration software should include overview, function introduction and operation instructions, etc. 5.4 Storage
5.4.1 Digital topographic map products use CDs as the main storage medium, and can use tapes, disks, etc. 5.4.2 Data can be stored in compression, but information cannot be lost. If the data is compressed and stored, a decompression program should be provided. 5.5 Packaging marking
Includes trademark, product name, geographical scope, production unit, confidentiality requirements and scope of use, production time, edition/publication year, all elements/sub-elements, price, etc.
5.6 Production, maintenance and update
The production, maintenance and update of digital topographic map products shall be carried out in accordance with the relevant provisions of the "Surveying and Mapping Law of the People's Republic of China". 6 Confidentiality
The production, distribution and use of digital topographic map products shall be carried out in accordance with the "Law of the People's Republic of China on Guarding State Secrets and relevant regulations. 358
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