Baidu Coordinate System (BD09)
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Introduction
Baidu Coordinate System (BD09), also known as Baidu Coordinate System, is a coordinate system developed by Baidu to meet the special needs of geographic information systems in mainland China. It is encrypted based on the WGS84 coordinate system (World Geodetic System 1984) to ensure accurate geographic positioning services within mainland China.
Data Format Overview
Baidu Coordinate System (BD09) is a coordinate system obtained by Baidu based on the GCJ-02 coordinate system and is mainly used for positioning and navigation on Baidu maps. The data formats of the BD09 coordinate system mainly include the following two types:
- BD09 longitude and latitude projection
- **Coordinate value format: **longitude and latitude format
- **Unit: **degree
- Features: Based on the GCJ-02 longitude and latitude, Baidu’s own biasing algorithm is applied again to improve the security and accuracy of map data.
- BD09 Web Mercator Projection
- Coordinate value format: Web Mercator format
- Unit: meter
- Features: Based on the GCJ-02 Web Mercator, Baidu’s own biasing processing is performed again.
Pros
1. Improve positioning accuracy: The BD09 coordinate system can more accurately match China’s topographic features, especially in densely populated urban areas, and its positioning accuracy has been significantly improved.
2. Protect user privacy: Due to the use of encryption algorithm, the BD09 coordinate system performs outstandingly in protecting user privacy and can effectively prevent location data from being illegally obtained and used.
3. Response to localized needs: The original intention of the design of the BD09 coordinate system is to provide more accurate geographic positioning services in mainland China, which is mainly due to its deep understanding and response to localized needs.
Cons
1. Poor cross-platform compatibility: Due to encryption processing, the data between the BD09 coordinate system and other coordinate systems cannot be directly and perfectly connected, which leads to the inconvenience of cross-platform data exchange.
2. High technical threshold: Although the encryption algorithm enhances security, it also increases the complexity of data processing. For developers, this means higher technical thresholds and cost investment.
Application Scenario
The BD09 coordinate system is mainly used in Baidu Maps to provide users with accurate navigation, positioning and geographic information query functions. In many fields such as intelligent transportation, urban planning, and disaster warning, the BD09 coordinate system provides strong technical support for smart city construction and geographic information services by combining it with advanced technologies such as big data analysis and cloud computing. For example, in the intelligent transportation system, the BD09 coordinate system can realize real-time positioning and path planning of vehicles, improve road traffic efficiency, and reduce traffic accidents.
Example
- BD09 longitude and latitude.
- Import BD09 projection.
