(Q29043632)

English

BD09

Baidu's Coordinate system based on GCJ02. Include two different variants, BD-09ll and BD-09mc, where BD-09ll is a coordinate system based on degree for end users while BD-09mc is a meter-based system based on Mercator projection for Baidu SDK users.

BD-09
BD-09mc
BD-09ll

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geodetic reference system

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imported from Wikimedia project

English Wikipedia

spatial reference system

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software obfuscation

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restrictions on geographic data in China

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0 references

1 reference

https://developer.baidu.com/map/changeposition.htm

publisher

Baidu Maps

1 reference

reference URL

https://developer.baidu.com/map/changeposition.htm

defining formula

\phi _{b}=r\times \cos(t)+0.0065;\theta _{b}=r\times \sin(t)+0.0060

measurement scale

degree

1 reference

reference URL

https://archive.fo/20170328042729/https://github.com/caijun/geoChina/blob/5c6284b/R/cst.R

t={\rm {atan2}}(\phi _{g},\theta _{g})+0.000003\times \cos(3000\theta _{g})

measurement scale

radian

0 references

r={\sqrt {{\rm {degrees}}(\phi _{g})^{2}+{\rm {degrees}}(\theta _{g})^{2}}}+0.00002\times \cos(3000\phi _{g})

measurement scale

radian

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official website

https://developer.baidu.com/map/changeposition.htm

language of work or name

Chinese

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maintained by WikiProject

WikiProject Mathematics

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(Q29043632)

BD09

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