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🗺️ 经纬度坐标系转换(WGS84/GCJ-02/BD-09)Coordinate Converter (WGS84 / GCJ-02 / BD-09)

在 GPS 使用的 WGS84、高德/腾讯/谷歌中国使用的 GCJ-02(火星坐标)和百度地图使用的 BD-09 之间批量转换经纬度,解决坐标放到地图上偏移几百米的问题。Batch-convert latitude/longitude between WGS84 (GPS), GCJ-02 (used by Amap, Tencent and Google Maps in China) and BD-09 (Baidu Maps), fixing the few-hundred-metre offset when plotting points on Chinese maps.

使用说明与常见问题How-to & FAQ

「经纬度坐标系转换(WGS84/GCJ-02/BD-09)」是什么?What is the Coordinate Converter (WGS84 / GCJ-02 / BD-09) tool?

在 GPS 使用的 WGS84、高德/腾讯/谷歌中国使用的 GCJ-02(火星坐标)和百度地图使用的 BD-09 之间批量转换经纬度,解决坐标放到地图上偏移几百米的问题。Batch-convert latitude/longitude between WGS84 (GPS), GCJ-02 (used by Amap, Tencent and Google Maps in China) and BD-09 (Baidu Maps), fixing the few-hundred-metre offset when plotting points on Chinese maps.

如何使用「经纬度坐标系转换(WGS84/GCJ-02/BD-09)」?How do I use the Coordinate Converter (WGS84 / GCJ-02 / BD-09)?

每行输入一个坐标,格式为「经度,纬度」(可在选项中改为「纬度,经度」),选择原坐标系和目标坐标系即可批量转换。中国境外的坐标没有加密偏移,会原样输出。Enter one coordinate per line as "longitude,latitude" (or switch to latitude,longitude), choose the source and target systems, and every line is converted. Points outside China have no offset and are returned unchanged.

为什么 GPS 坐标放到高德或百度地图上会偏?Why do GPS points land in the wrong place on Chinese maps?

中国大陆的公开地图必须使用国家测绘局加密的 GCJ-02 坐标,它在 WGS84 的基础上加入了非线性偏移(通常 100–700 米);百度在 GCJ-02 之上又做了一次 BD-09 加密。坐标系不一致时就会出现偏移,用本工具转换后即可对齐。Public maps in mainland China must use the GCJ-02 system, which adds a non-linear offset (typically 100–700 m) to WGS84; Baidu adds a further BD-09 transform on top. Mixing systems causes the offset — convert first and the points line up.

GCJ-02 转回 WGS84 精确吗?Is GCJ-02 → WGS84 exact?

官方没有公开反算公式,本工具用迭代法反推,误差在 1 厘米以内(约 1e-7 度),足够日常使用。There is no official inverse; this tool inverts it iteratively to within about 1 cm (≈1e-7°), which is plenty for everyday use.

哪些地图用哪种坐标?Which maps use which system?

WGS84:GPS 设备、手机原始定位、OpenStreetMap、谷歌地图(中国境外)。GCJ-02:高德、腾讯、谷歌中国、苹果地图(中国)。BD-09:百度地图。WGS84: GPS devices, raw phone location, OpenStreetMap, Google Maps outside China. GCJ-02: Amap, Tencent, Google Maps China, Apple Maps in China. BD-09: Baidu Maps.

「经纬度坐标系转换(WGS84/GCJ-02/BD-09)」免费吗?数据会上传吗?Is the Coordinate Converter (WGS84 / GCJ-02 / BD-09) free? Is my data uploaded?

「经纬度坐标系转换(WGS84/GCJ-02/BD-09)」完全免费,无需注册或安装,手机和电脑都能用;所有处理都在你的浏览器本地完成,输入的内容和文件不会上传到服务器。The Coordinate Converter (WGS84 / GCJ-02 / BD-09) is completely free with no sign-up or install and works on phones and desktops; everything runs locally in your browser and nothing you enter is uploaded.

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