GB/T 33183-2016Fundamental geographic information—Specifications for 1:50 000 topographic data (English PDF)

1 Scope

This standard specifies the content, composition and requirements of the terrestrial element data of 1. 50000 basic geographic information, including mathematical basis, accuracy and

Current requirements, data stratification and organization, selection of principles and indicators, elements and attribute content, metadata and so on.

This standard is applicable to the production, construction, updating and distribution of terrestrial data of 1. 50000 basic geographic information.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article

Pieces. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 12341-2008 1.250001. 500001.100000 Topographic map Aerial photogrammetry field practice

GB/T 13989 National basic scale topographic map

GB/T 17278 Digital topographic map product basic requirements

3 data description

Basic Geographic Information Terrain feature data is a vector dataset that expresses geographic information elements in terms of points, lines, and faces. The point element is represented as one

Coordinate elements and corresponding attribute values; the line elements are represented as a series of coordinate tuples and corresponding attribute values; the surface elements are represented by the first and the next

A string of coordinate tuples and corresponding attribute values.

1. 50000 terrain factor data is the main component of national basic geographic information, including positioning basis, water system, residential area and

Facilities, transportation, pipelines, realm and politics, landforms, vegetation and soil, toponymic 9 categories, widely used in national economic construction, national defense construction

And social development and so on.

4 data composition

1. 50000 Basic Geographic Information Terrain feature data consists of vector data and metadata.

a) vector data storage 9 categories of geographic information elements of the spatial coordinates, attribute information and the relationship between;

b) Metadata records A description of the vector data.

5 data requirements

Basic Mathematics