通过百度拾取的经纬度坐标在导入geojson.io中出现偏离的情况：
如百度拾取的经纬度转的geojson
{"type":"FeatureCollection", "features": [ {"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[121.650726,29.743914],[121.650583,29.743538],[121.658488,29.740151],[121.666537,29.740528],[121.672429,29.745169],[121.676598,29.749308],[121.678754,29.752443],[121.677173,29.760094],[121.670274,29.762477],[121.659781,29.763606],[121.651445,29.759843],[121.649577,29.756708],[121.642246,29.752443],[121.650726,29.743914]]]},"properties":{}} ]}
百度坐标系显示图片
国家坐标系
转换工具的使用
GIS数据转换器，有一定免费额度的收费软件。
转化后的geojson(WGS-84)标准
{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[121.64009894107699,29.74063281544937,0.0],[121.63995571330972,29.740259751361002,0.0],[121.64788516455246,29.736711006496435,0.0],[121.65595488041897,29.736928107690535,0.0],[121.66185504151488,29.741469578885745,0.0],[121.66602482060898,29.745552664008386,0.0],[121.66817869658394,29.748664123306622,0.0],[121.66659021681468,29.756328387344563,0.0],[121.65968199940538,29.758804961293155,0.0],[121.64916350225919,29.7601314909043,0.0],[121.64080713031355,29.756542097160384,0.0],[121.63893698654098,29.753445241311759,0.0],[121.63159177825486,29.749311164348107,0.0],[121.64009894107699,29.74063281544937,0.0]]]},"properties":{}}]}
LOCKDATAV DONE！
