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GB/T 35634-2017Tile data specification of electronic map for public service (English PDF)

公共服务电子地图瓦片数据规范

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 29, 2017

Implementation date

July 1, 2018

Scope

GB/T 35634-2017 is the English-translated version of 公共服务电子地图瓦片数据规范.

GB/T 35634-2017 is the Chinese standard "Tile data specification of electronic map for public service". Its scope clause reads: This standard specifies the basic regulations, classification, organization, content and expression of the public service electronic map tile data.

This standard is applicable to the production of two-dimensional vector and video electronic map tile data for public services provided by government or public organizations. exchange. Its clauses include terms and definitions; basic regulations; rating.

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Document preview — GB/T 35634-2017

National Standard of the People's Republic of China

ICS: 07.040
Classification: A 75

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Terms and Definitions
3 Basic regulations
3.1 Coordinate System
3.2 Specification
3.3 Format
4 Grade
5 Tile Data Organization
5.1 tile data file named
5.2 Data Organization
6 Content
7 Expression
Appendix A (informative annex) Vector map tile data elements and expression
Appendix B (informative annex) Image map tile data elements and expression

1 Scope

This standard specifies the basic regulations, classification, organization, content and expression of the public service electronic map tile data.

This standard is applicable to the production of two-dimensional vector and video electronic map tile data for public services provided by government or public organizations.

exchange.

2 Terms and definitions

The following terms and definitions apply to this document.

2.1 Tile data

According to a certain grid division rule, several picture units formed by dividing a map defining a geographic coverage area are formed.

2.2 Map load

The sum of lines, symbols, and annotated areas within the unit area on the map.

3 Basic regulations

3.1 coordinate system

The coordinate system of the electronic map tile data adopts.2000 National Earth Coordinate System (CGCS2000).

3.2 Specifications

The tile data specification is defined as follows.

a) The tile data blocks start at 180° west longitude, 90° north latitude, and increase east to south.

b) The tile data block size is 256 pixels x 256 pixels.

3.3 Format

The tile data format uses PNG or JPG.

4 rating

Tile data is graded according to the display scale and ground resolution. The display scale calculation method is shown in formula (1) and formula (2).

S=1.

Gr×Sr

0.0254 (1)

In the formula.

S --- display scale;

Gr --- ground resolution in meters per pixel (m/pixel);

Sr --- screen resolution, the value is 96dpi;

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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