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+---
+aliases: gcj-02, bd09, bd09ll, bd09mc, bd-09ll, bd-09mc
+display_name: GCJ-02
+short_description: GCJ-02 and BD-09 are map obfuscation algorithms used in China.
+topic: gcj02
+wikipedia_url: https://en.wikipedia.org/wiki/Restrictions_on_geographic_data_in_China#GCJ-02
+---
+GCJ-02 and BD-09 are map obfuscation algorithms used in China; obfuscation is mandatory for all domestic online maps.