This project forked from freegis/postgis_coordinate_transform
一个在postgis中结合**国情，批量对数据进行加偏到百度坐标，高德谷歌的火星坐标，或者逆向纠偏
License: Apache License 2.0
一个在postgis中结合**国情，批量对数据进行加偏到百度坐标，高德谷歌的火星坐标，或者逆向纠偏
在postgresql-postgis空间数据库中，执行sql文件中语句即可。
select LayerTransform( in inputlayer text,--输入图层名字 in transformtype transform_type--转换类型枚举型。 ) 如在psql中输入: select LayerTransform('road','GCJ2WGS'); 回车执行该语句即可，等待完成。该示例代码是将 road表从火星坐标系转往84坐标系。
inputlayer：输入的表名称，是个要加/纠偏的table名称，table是个空间表。
transformtype：加/纠偏方式，支持以下6种'BD2GCJ', 'GCJ2BD', 'WGS2GCJ','GCJ2WGS','BD2WGS','WGS2BD'，分别代表 百度转谷歌高德，谷歌高德转百度，84转火星，火星转84，百度转84,84转百度。
转换前：底图是osm，非偏移的84墨卡托投影，'road'是火星坐标的墨卡托投影。
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