This standard specifies the exchange format of two spatial data, vector and raster. It is applicable to the data exchange of various vector data, image data, grid GIS data, and digital elevation model (DEM). This standard does not include the data exchange format. GB/T 17798-1999 Geospatial Data Exchange Format GB/T17798-1999 Standard download decompression password: www.bzxz.net
This standard specifies the exchange format of two spatial data, vector and raster. It is applicable to the data exchange of various vector data, image data, grid GIS data, and digital elevation model (DEM). This standard does not include the data exchange format.

GB/T 17798--1999
During the preparation of this standard, reference was made to the standards of the United States ANSI X3L1-1995-009X, ISO8211, NATO DIGEST, UK NTF, the United States DLG, DEM, DOQ, DRG, and other standards, as well as the standard materials on data formats of commercial GIS and graphics software that are currently popular in the world. The spatial data conceptual model in Appendix A of the standard basically follows the description of the conceptual model in ANSI X3L1-1995-009X and ISO8211, with a few changes.
Appendix A of this standard is a standard appendix, and Appendix B, Appendix C, Appendix D, and Appendix E are prompt appendices. This standard was proposed by the State Administration of Surveying, Mapping and Geoinformation. bZxz.net
This standard is under the jurisdiction of the State Administration of Surveying, Mapping and Geoinformation.
This standard was drafted by Wuhan University of Surveying and Mapping and the Institute of Surveying and Mapping Standardization of the State Administration of Surveying, Mapping and Geoinformation. The main drafters of this standard are Gong Jianya, Huang Juntao, Wang Wei, Xue Ming, Cheng Yanhui and Wang Zhanhong. 484
National Standard of the People's Republic of China
Geo-spatial data transfer format
Geo-spatial data transfer formatGB/T 17798-1999
This standard specifies the exchange format of two spatial data, namely, vector and raster. It is applicable to the data exchange of various vector data, image data, grid GIS data and digital elevation model (DEM). This standard does not include the exchange format of metadata. 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 the parties using this standard should explore the possibility of using the latest versions of the following standards. GB2312—1980 Basic set of Chinese character coded character set for information exchange 3 Terminology
This standard adopts the following definitions.
3.1 Entity
a) A representation of a collection of data elements in a conceptual model. b) A class of objects with common properties.
3.2 Instance
A geographical element and information describing the characteristics of the geographical element. 3.3 Node
A zero-dimensional topological element.
3.4 ​​Edge
A one-dimensional topological element.
3.5 Face
A two-dimensional topological element.
3.6 Topological relationship A feature relationship that describes the boundary topology and point set topology between two elements. 3.7 Topology
A scientific description of the relationship between connected or adjacent points, lines, surfaces, and volumes. Specifically refers to the properties of an object that remain unchanged under continuous mapping transformations.
3.8 Feature
An abstraction of a real-world phenomenon.
3.9 Raster data
Data represented as a regular spatial array. 3.10 Vector data
Data represented by geometric elements
Approved by the State Administration of Quality and Technical Supervision on August 2, 1999 and implemented on October 1, 2000
3.11 Grid data
GB/T 17798-1999
Data arranged in a regular chessboard pattern in space corresponding to a specific reference system. 4 General provisions
4.1 The basis of the spatial data exchange format specified in this standard is a spatial data model. The definition of its conceptual model and spatial objects is shown in Appendix A (Appendix to the standard).
4.2 This standard uses a mixture of Backus-Naur format (BNF) and text description to accurately describe the structure, relationships and format described. Each production rule has a left term (identifier) ​​and a right term (expression), which are connected by "::" and mean that the left term is generated by the right term or replaced by the right term. 4.3 The meanings of the symbols used for production rules are shown in Table 1. Table 1
is replaced, generated, composed of
or (choose one of the terms before and after the symbol) contains
The terms can be repeated at least m times and at most n times, with m=0 as the default, and n=co The terms are optional, equivalent to (
The terms should be replaced
take the value between the terms before and after the symbol
The terms represent the characters themselves, such as \" represents the character I (7CH) 4.4 Basic components of the file structure and their meanings
a)Carriage return (OAH) (<blank>} Carriage return (OAH)) indicates line break and/or several blank lines.
b) <blank>≥:: 1 Space (20H) "Tab (08H)) <Target identification code> 2 <Integer>
Positive numbers are used as target identification, and zero and negative numbers are used to express the spacing and direction of the lines that make up the surface elements. d) Feature type code>;{<Chinese characters> "English letters" "numbers> "No more than 16 bytes. "Unknown\ is a predefined reserved code. e) <Layer name>: (<Chinese characters> "English letters> <numbers> h No more than 32 bytes. *Unknown" is a predefined reserved layer name. f):=<floating point>
X direction coordinate.
）AYVA floating point V
Y direction coordinate.
h）Z>::=<floating point>
Elevation coordinate, the unit is meter (m).
i)β>=floating point>
Note direction, the unit is degree (°).
j）<integer>
Integer value used to express color.
k)Date>DD>
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