百度地图坐标解密方法精度分析  

Accuracy Analysis of Baidu Map's Coordinates Decryption Methods

作　　者：杨丁亮[1] 刘志平[1] 仲崇武[2] YANG Dingliang;LIU Zhiping;ZHONG Chongwu(School of Environment Science and Spatial Informaties,China University of Mining and Technology,Xuzhou 221116,China;Nantun Coal Mine,Yanzhou Coal Mining Company Limited,Zoueheng 273515,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]兖州煤业股份有限公司南屯煤矿,山东邹城273515

出　　处：《测绘通报》2018年第7期43-47,共5页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(41730109;41504032);国家重点研发计划(2016YFC0803103;2016YFB0502102);精密工程与工业测量国家测绘局重点实验室开放基金(PF2017-12)

摘　　要：介绍了3种百度坐标解密的方法——等量偏移法、格网法和BP神经网络,并改进了等量偏移法,得到了二阶差分公式。选取乌鲁木齐、拉萨、兰州、北京、上海和三沙6座城市,在各城市中心点建立0.1°方格的研究区域,对比了上述解密方法得到的WGS-84预测值与参考值的经纬度差离散图和点位误差分布频率表。结果表明,等量偏移二阶差分法的坐标解密精度在10 m左右,等量偏移一阶差分法在20 m左右,BP神经网络在50 m左右,格网法在100 m左右。同时,利用百度地图提供的距离和面积量算工具对等量偏移一阶差分和二阶差分方法进行了应用验证。This paper introduces three Baidu decryption methods including equivalent offset coordinate method,grid method and BP neural network. In addition,the general difference formula is obtained based on equivalent offset method. The cities of Urumqi,Lhasa,Lanzhou,Beijing,Shanghai and Sansha are selected to build the 0. 1 degree square research area with each city center. The predicted WGS-84 coordinates translated by those methods are compared with the references to analysis the difference of the latitude and longitude and the positional error distribution.And the experimental results show that the coordinate decryption accuracy are about 10 m,20 m,50 m,and 100 m respectively. Simultaneously,it also researches the differences of calculating distance and area by Baidu online tools and the first-order and two-order equivalent offset difference method respectively.

关 键 词：百度地图坐标 等量偏移通用公式 BP神经网络 格网法 精度评价 

分 类 号：P208[天文地球—地图制图学与地理信息工程]