gjc02转wgs84 基于postgis

其实各种方法网上都有现成的代码；

实践过的主要是两种

一个是基于nodejs的coordTransfrom

https://github.com/xinkuan-jack/CoordTransfrom

另一个是基于postGIS来实现

源代码参见，也放一份至文末

https://blog.csdn.net/qq_28459505/article/details/91969514

使用postgis的好处是几乎不用编写代码，不仅可以完成坐标转换，也支持线面图形的整体转换，也可应用于服务端

线面图形的转换原理就是图形构成点拆分转换再组装为原来的图形结构；

使用方式

1 安装postgresql+postgis

2 运行文末的函数（数据库专用名词叫存储过程）

3 设置对应表的sird ，本来正常导入的shp为4326的，但在使用过程中，会发现某些数据为0，导致无法运行

select UpdateGeometrySRID('tablename', 'geom', 4326);

然后执行对应的函数即可

4 public为shema名称，xagc为表名称，GCJ2WGS为转换模式，可选值在枚举列表中；导入数据默认就在public中。

SELECT freegis_coordinate_transform('public','xagc','GCJ2WGS' )

-- 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
-- 即 百度 转 谷歌、高德
CREATE OR REPLACE FUNCTION FreeGIS_BD2GCJ(in bd_point geometry(Point,4326),out gcj_point geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLAREx double precision;y double precision;z double precision;theta double precision;x_pi double precision:=3.14159265358979324 * 3000.0 / 180.0;
BEGINx:= ST_X(bd_point) - 0.0065;y:= ST_Y(bd_point) - 0.006;z:=sqrt(power(x,2) + power(y,2)) - 0.00002 *sin(y * x_pi);theta:= atan2(y, x) - 0.000003 * cos(x * x_pi);gcj_point:=ST_SetSRID(ST_MakePoint(z *cos(theta),z *sin(theta)),4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
--即谷歌、高德 转 百度
CREATE OR REPLACE FUNCTION FreeGIS_GCJ2BD(in gcj_point geometry(Point,4326),out bd_point geometry(Point,4326)
) RETURNS geometry As
$BODY$
DECLAREz double precision;theta double precision;x_pi double precision:=3.14159265358979324 * 3000.0 / 180.0;gcj_lon double precision;gcj_lat double precision;
BEGINgcj_lon:=ST_X(gcj_point);gcj_lat:=ST_Y(gcj_point);z:= sqrt(power(gcj_lon,2) + power(gcj_lat,2)) + 0.00002 * sin(gcj_lat * x_pi);theta:= atan2(gcj_lat, gcj_lon) + 0.000003 * cos(gcj_lon * x_pi);bd_point:=ST_SetSRID(ST_MakePoint(z * cos(theta) + 0.0065,z * sin(theta) + 0.006),4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--84转火星
--即真实的gps坐标 转 谷歌，高德
CREATE OR REPLACE FUNCTION FreeGIS_WGS2GCJ(in wgs_point geometry(Point,4326),out gcj_point geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLAREa double precision:= 6378245.0;ee double precision:= 0.00669342162296594323;dLat double precision;dLon double precision;x double precision;y double precision;radLat double precision;magic double precision;SqrtMagic double precision;wgs_lon double precision;wgs_lat double precision;
BEGINwgs_lon:=ST_X(wgs_point);wgs_lat:=ST_Y(wgs_point);--坐标在国外if(wgs_lon < 72.004 or wgs_lon > 137.8347 or wgs_lat < 0.8293 or wgs_lat > 55.8271) thengcj_point:=wgs_point;return;end if;--国内坐标x:=wgs_lon - 105.0;y:=wgs_lat - 35.0;dLat:= -100.0 + 2.0 * x + 3.0 * y + 0.2 * power(y,2) + 0.1 * x * y + 0.2 * sqrt(abs(x))+(20.0 * sin(6.0 * x * pi()) + 20.0 * sin(2.0 * x * pi())) * 2.0 / 3.0+ (20.0 * sin(y * pi()) + 40.0 * sin(y / 3.0 * pi())) * 2.0 / 3.0+ (160.0 * sin(y / 12.0 * pi()) + 320 * sin(y * pi() / 30.0)) * 2.0 / 3.0;dLon:= 300.0 + x + 2.0 * y + 0.1 * power(x,2) + 0.1 * x * y + 0.1 * sqrt(abs(x))+ (20.0 * sin(6.0 * x * pi()) + 20.0 * sin(2.0 * x * pi())) * 2.0 / 3.0+ (20.0 * sin(x * pi()) + 40.0 * sin(x / 3.0 * pi())) * 2.0 / 3.0+ (150.0 * sin(x / 12.0 * pi()) + 300.0 * sin(x / 30.0 * pi())) * 2.0 / 3.0;radLat:=wgs_lat / 180.0 * pi();magic:= sin(radLat);magic:=1 - ee * magic * magic;SqrtMagic:= sqrt(magic);dLon:= (dLon * 180.0) / (a / SqrtMagic * cos(radLat) * pi());dLat:= (dLat * 180.0) / ((a * (1 - ee)) / (magic * SqrtMagic) * pi());gcj_point:=ST_SetSRID(ST_MakePoint(wgs_lon + dLon,wgs_lat + dLat),4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--火星转84
--即  谷歌，高德 转 真实gps坐标
CREATE OR REPLACE FUNCTION FreeGIS_GCJ2WGS(in gcj_point geometry(Point,4326),out wgs_point geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLARE_gcj_point geometry(Point,4326);gcj_lon double precision;gcj_lat double precision;d_lon double precision;d_lat double precision;
BEGIN_gcj_point:=FreeGIS_WGS2GCJ(gcj_point);gcj_lon:=ST_X(gcj_point);gcj_lat:=ST_Y(gcj_point);d_lon:= ST_X(_gcj_point)-gcj_lon;d_lat:= ST_Y(_gcj_point)-gcj_lat;wgs_point:=ST_SetSRID(ST_MakePoint(gcj_lon - d_lon,gcj_lat - d_lat),4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--百度转WGS
CREATE OR REPLACE FUNCTION FreeGIS_BD2WGS(in bd_point geometry(Point,4326),out wgs_point geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLARE_gcj_point geometry(Point,4326);
BEGIN--百度先转火星_gcj_point:=FreeGIS_BD2GCJ(bd_point);--火星转84wgs_point:=FreeGIS_GCJ2WGS(_gcj_point);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--WGS转百度
CREATE OR REPLACE FUNCTION FreeGIS_WGS2BD(in wgs_point geometry(Point,4326),out bd_point geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLARE_gcj_point geometry(Point,4326);
BEGIN--84转火星_gcj_point:=FreeGIS_WGS2GCJ(wgs_point);--火星转百度bd_point:=FreeGIS_GCJ2BD(_gcj_point);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--百度经纬转百度墨卡托
CREATE OR REPLACE FUNCTION FreeGIS_BDWGS2BDMKT(in bd_point_4326 geometry(Point,4326),out bd_point_3857 geometry(Point,3857)
) RETURNS geometry As $BODY$
DECLARELL2MC double precision[]:=array[[-0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340, 26112667856603880, -35149669176653700, 26595700718403920, -10725012454188240, 1800819912950474, 82.5], [0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5], [0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5], [0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5], [-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5], [-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45]];LLBAND integer[]:=array[75,60,45,30,15,0];i integer;cF double precision[];cC double precision;bd_wgslon double precision;bd_wgslat double precision;bd_mktlon double precision;bd_mktlat double precision;
BEGINbd_wgslon:=ST_X(bd_point_4326);bd_wgslat:=ST_Y(bd_point_4326);while bd_wgslon > 180 loopbd_wgslon:= bd_wgslon-360;end loop;while bd_wgslon<-180 loopbd_wgslon:= bd_wgslon+360;end loop;if bd_wgslat<-74 thenbd_wgslat:=-74;end if;if bd_wgslat>74 thenbd_wgslat:=74;end if;for i in 1..array_length(LLBAND,1) loopif bd_wgslat>=LLBAND[i] thencF = LL2MC[i:i];exit;end if;end loop;IF array_length(cF,1) IS NULL THENfor i in array_length(LLBAND,1)..1 loopif bd_wgslat<=-LLBAND[i] thencF = LL2MC[i:i];exit;end if;end loop;end if;bd_mktlon:= cF[1][1] + cF[1][2] * abs(bd_wgslon);cC:= abs(bd_wgslat) / cF[1][10];bd_mktlat = cF[1][3] + cF[1][4] * cC + cF[1][5] * cC * cC + cF[1][6] * cC * cC * cC + cF[1][7] * cC * cC * cC * cC + cF[1][8] * cC * cC * cC * cC * cC + cF[1][9] * cC * cC * cC * cC * cC * cC;if bd_mktlon<0 thenbd_mktlon:=-bd_mktlon;end if;if bd_mktlat<0 thenbd_mktlat:=-bd_mktlat;end if;bd_point_3857:=ST_SetSRID(ST_MakePoint(bd_mktlon,bd_mktlat),3857);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--百度墨卡托转百度经纬度
CREATE OR REPLACE FUNCTION FreeGIS_BDMKT2BDWGS(in bd_point_3857 geometry(Point,3857),out bd_point_4326 geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLAREMCBAND double precision[]:= array[12890594.86,8362377.87,5591021,3481989.83,1678043.12,0];MC2LL double precision[]:= array [[1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2], [-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86], [-3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37], [-1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06], [3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4], [2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5]];i integer;cF double precision[];cC double precision;bd_wgslon double precision;bd_wgslat double precision;BEGINbd_wgslon = abs(ST_X(bd_point_3857));bd_wgslat = abs(ST_Y(bd_point_3857));for i in 1..array_length(MCBAND,1) loopif bd_wgslat>=MCBAND[i] thencF = MC2LL[i:i];exit;end if;end loop;bd_wgslon = cF[1][1] + cF[1][2] * abs(bd_wgslon);cC = abs(bd_wgslat) / cF[1][10];bd_wgslat = cF[1][3] + cF[1][4] * cC + cF[1][5] * cC * cC + cF[1][6] * cC * cC * cC + cF[1][7] * cC * cC * cC * cC + cF[1][8] * cC * cC * cC * cC * cC + cF[1][9] * cC * cC * cC * cC * cC * cC;if bd_wgslon<0 thenbd_wgslon:=-bd_wgslon;end if;if bd_wgslat<0 thenbd_wgslat:=-bd_wgslat;end if;bd_point_4326:=ST_SetSRID(ST_MakePoint(bd_wgslon,bd_wgslat),4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--WGS转百度墨卡托
CREATE OR REPLACE FUNCTION FreeGIS_WGS2BDMKT(in wgs_point geometry(Point,4326),out bd_point_3857 geometry(Point,3857)
) RETURNS geometry As $BODY$
DECLAREbd_point_4326 geometry(Point,4326);BEGIN--wgs转百度bd_point_4326:=FreeGIS_WGS2BD(wgs_point);bd_point_3857:=FreeGIS_BDWGS2BDMKT(bd_point_4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--百度墨卡托转WGS
CREATE OR REPLACE FUNCTION FreeGIS_BDMKT2WGS(in bd_point_3857 geometry(Point,3857),out wgs_point geometry(Point,4326)
) RETURNS geometry As $BODY$
DECLAREbd_point_4326 geometry(Point,4326);BEGIN--百度墨卡托转百度经纬bd_point_4326:=FreeGIS_BDMKT2BDWGS(bd_point_3857);--百度经纬转 wgs经纬wgs_point:=FreeGIS_BD2WGS(bd_point_4326);return;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;drop TYPE if exists FreeGIS_coordinate_transform_type cascade;
CREATE TYPE FreeGIS_coordinate_transform_type AS ENUM ('BD2GCJ', 'GCJ2BD', 'WGS2GCJ','GCJ2WGS','BD2WGS','WGS2BD',
'BDWGS2BDMKT','BDMKT2BDWGS','WGS2BDMKT','BDMKT2WGS');--对表批量进行坐标转换
CREATE OR REPLACE FUNCTION FreeGIS_Coordinate_Transform(in schema_name text,--转换表的schema名称in table_name text,--转换表名字in transform_type FreeGIS_coordinate_transform_type--转换类型枚举型。
) RETURNS text As
$BODY$
DECLAREserver_version int;
beginserver_version:=current_setting('server_version_num')::int;--11以上版本if(server_version>=110000) thenreturn _FreeGIS_Coordinate_Transform_1(schema_name,table_name,transform_type);--低于11的版本else return _FreeGIS_Coordinate_Transform_2(schema_name,table_name,transform_type);end if;END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--对表批量进行坐标转换
CREATE OR REPLACE FUNCTION _FreeGIS_Coordinate_Transform_1(in schema_name text,--转换表的schema名称in table_name text,--转换表名字in transform_type FreeGIS_coordinate_transform_type--转换类型枚举型。
) RETURNS text As
$BODY$
DECLARErec record;geom_name text;geom_type text;transform_function_name text;_source_srid int;_target_srid int;
BEGIN--检查表是否存在select * from pg_tables where schemaname=schema_name and tablename=table_name into rec;if(rec is null) thenraise notice '坐标转换表不存在，可能scheam或tablename输入错误！';return 'failed';end if;--检查转换表是否为空间关系表select * from geometry_columns where f_table_name=table_name and f_table_schema=schema_name into rec;if(rec is null) thenraise notice '当前转换只支持带geometry类型的空间关系表！';return 'failed';end if;--检查图形维度，当前只支持二维。if(rec.coord_dimension!=2) thenraise notice '当前转换只支持二维图形坐标！';return 'failed';end if;--检查图形坐标系，当前只支持4326坐标系（除将百度墨卡托转百度经纬度除外）if(transform_type!='BDMKT2BDWGS' and transform_type!='BDMKT2WGS') thenif(rec.srid!=4326) thenraise notice '当前转换只支持数据源为WGS84(EPSG:4326)坐标系！';raise notice '其他坐标系建议先自行转换到4326坐标系，然后使用该脚本进行批量坐标纠正！';return 'failed';end if;else--百度墨卡托转其他坐标系，转换方式为BD_MKT2WGS，数据源坐标系应当为3857if(rec.srid!=3857) thenraise notice '百度墨卡托转其他坐标系，数据源坐标系必须为(EPSG:3857)坐标系！';return 'failed';end if;end if;geom_type:=rec.type;geom_name:=rec.f_geometry_column;--检查图形类型，仅仅支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六种明确类型。--类似geometry或者collection类型，由于指定不明确，不太好进行规律转化。if(geom_type!='POINT' and geom_type!='MULTIPOINT' and geom_type!='LINESTRING' and geom_type!='MULTILINESTRING' AND geom_type!='POLYGON' and geom_type!='MULTIPOLYGON') thenraise notice '当前转换只支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六种基本图形类型！';return 'failed';end if;--转换函数名称拼接transform_function_name:='FreeGIS_'||transform_type;--图形拆分成点，点图形 进行坐标 偏移转换。--转换表新建转换结果字段，对原图形字段拆分，创建临时表存储拆分结果if(transform_type='BDWGS2BDMKT' or transform_type='WGS2BDMKT') then_source_srid:=4326;_target_srid:=3857;elsif(transform_type='BDMKT2BDWGS' or transform_type='BDMKT2WGS') then_source_srid:=3857;_target_srid:=4326;else_source_srid:=4326;_target_srid:=4326;end if;execute format('alter table %I.%I drop column if exists transform_geom',schema_name,table_name);execute format('alter table %I.%I add column transform_geom geometry(%s,%s)',schema_name,table_name,geom_type,_target_srid);execute format('create temp table _split_result(rec_ctid tid,geom_path integer[],source_geom geometry(Point,%s),target_geom geometry(Point,%s)) on commit drop',_source_srid,_target_srid);raise notice '正在将图形拆分成点...';--图形字段非空，将其拆分成点，存入临时表execute format('insert into _split_result(rec_ctid,geom_path,source_geom) SELECT ctid,(pt).path,(pt).geom FROM (SELECT ctid, ST_DumpPoints(%I) AS pt FROM %I.%I where ST_IsEmpty(%I)=false) as dump_points',geom_name,schema_name,table_name,geom_name);raise notice '图形拆分成点完成！';--临时表建立索引raise notice '对拆分成点后的数据集建索引...';create index _split_result_ctid_idx on _split_result using btree(rec_ctid);raise notice '对拆分成点后的数据集建索引完成！';--批量转换，从souce源转到target记录raise notice '对拆分点进行偏移计算...';execute format('update _split_result set target_geom=%s(source_geom)',transform_function_name);raise notice '对拆分点进行偏移计算完成！';raise notice '偏移计算结果拼装原图形...';--转换完成后，拼装还原更改原表case geom_typewhen 'POINT' thenexecute format('update %I.%I t1 set transform_geom=t2.target_geom from _split_result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'MULTIPOINT' thenexecute format('with _result as (select rec_ctid,ST_Multi(ST_Union(target_geom)) as geom from _split_result group by rec_ctid) update %I.%I t1 set transform_geom=t2.geom from _result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'LINESTRING' thenexecute format('with _result as (select rec_ctid,ST_MakeLine(target_geom) as geom from _split_result group by rec_ctid) update %I.%I t1 set transform_geom=t2.geom from _result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'MULTILINESTRING' thenexecute format('with _result as (select t.rec_ctid,ST_Multi(ST_Union(t.geom)) as geom from (select rec_ctid,geom_path[1],ST_MakeLine(target_geom) as geom from  _split_result group by rec_ctid,geom_path[1]) t group by t.rec_ctid) update %I.%I t1 set transform_geom=t2.geom from _result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'POLYGON' thenexecute format('with _result as (                    with _polygon_result as (select rec_ctid,geom_path[1] as _path,ST_MakeLine(target_geom) as geom from _split_result group by rec_ctid,_path)select t1.rec_ctid,case when t2.geom is null then ST_MakePolygon(t1.geom) else ST_MakePolygon(t1.geom,t2.geom) end as geom from (select rec_ctid,geom  from _polygon_result t where t._path=1) t1 left join (select rec_ctid,array_agg(geom) as geom  from _polygon_result t where t._path!=1 group by rec_ctid) t2 on t1.rec_ctid=t2.rec_ctid) update %I.%I t1 set transform_geom=t2.geom from _result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'MULTIPOLYGON' thenexecute format('with _result as (with _Multi_Polygon_result as (with _polygon_result as (select rec_ctid,geom_path[1] as _path1,geom_path[2] as _path2,ST_MakeLine(target_geom) as geom from _split_result group by rec_ctid,_path1, _path2)select t1.rec_ctid,t1._path1,case when t2.geom is null then ST_MakePolygon(t1.geom) else ST_MakePolygon(t1.geom,t2.geom) end as geom from (select rec_ctid,_path1,geom  from _polygon_result t where t._path2=1) t1 left join (select rec_ctid,_path1,array_agg(geom) as geom  from _polygon_result t where t._path2!=1 group by rec_ctid,_path1) t2 on t1.rec_ctid=t2.rec_ctid) select t.rec_ctid,ST_Multi(ST_Union(geom)) as geom from _Multi_Polygon_result t group by t.rec_ctid) update %I.%I t1 set transform_geom=t2.geom from _result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);elseraise notice '不是当前支持的图形类型！';return 'failed';end case;    raise notice '偏移计算结果拼装原图形完成！'; return 'success';
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;--对表批量进行坐标转换
CREATE OR REPLACE FUNCTION _FreeGIS_Coordinate_Transform_2(in schema_name text,--转换表的schema名称in table_name text,--转换表名字in transform_type FreeGIS_coordinate_transform_type--转换类型枚举型。
) RETURNS text As
$BODY$
DECLARErec record;geom_name text;geom_type text;transform_function_name text;_source_srid int;_target_srid int;beforerec record;_init boolean;_line geometry;_multiline geometry;
BEGIN--检查表是否存在select * from pg_tables where schemaname=schema_name and tablename=table_name into rec;if(rec is null) thenraise notice '坐标转换表不存在，可能scheam或tablename输入错误！';return 'failed';end if;--检查转换表是否为空间关系表select * from geometry_columns where f_table_name=table_name and f_table_schema=schema_name into rec;if(rec is null) thenraise notice '当前转换只支持带geometry类型的空间关系表！';return 'failed';end if;--检查图形维度，当前只支持二维。if(rec.coord_dimension!=2) thenraise notice '当前转换只支持二维图形坐标！';return 'failed';end if;--检查图形坐标系，当前只支持4326坐标系（除将百度墨卡托转百度经纬度除外）if(transform_type!='BDMKT2BDWGS' and transform_type!='BDMKT2WGS') thenif(rec.srid!=4326) thenraise notice '当前转换只支持数据源为WGS84(EPSG:4326)坐标系！';raise notice '其他坐标系建议先自行转换到4326坐标系，然后使用该脚本进行批量坐标纠正！';return 'failed';end if;else--百度墨卡托转其他坐标系，转换方式为BD_MKT2WGS，数据源坐标系应当为3857if(rec.srid!=3857) thenraise notice '百度墨卡托转其他坐标系，数据源坐标系必须为(EPSG:3857)坐标系！';return 'failed';end if;end if;geom_type:=rec.type;geom_name:=rec.f_geometry_column;--检查图形类型，仅仅支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六种明确类型。--类似geometry或者collection类型，由于指定不明确，不太好进行规律转化。if(geom_type!='POINT' and geom_type!='MULTIPOINT' and geom_type!='LINESTRING' and geom_type!='MULTILINESTRING' AND geom_type!='POLYGON' and geom_type!='MULTIPOLYGON') thenraise notice '当前转换只支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六种基本图形类型！';return 'failed';end if;--转换函数名称拼接transform_function_name:='FreeGIS_'||transform_type;--图形拆分成点，点图形 进行坐标 偏移转换。--转换表新建转换结果字段，对原图形字段拆分，创建临时表存储拆分结果if(transform_type='BDWGS2BDMKT' or transform_type='WGS2BDMKT') then_source_srid:=4326;_target_srid:=3857;elsif(transform_type='BDMKT2BDWGS' or transform_type='BDMKT2WGS') then_source_srid:=3857;_target_srid:=4326;else_source_srid:=4326;_target_srid:=4326;end if;execute format('alter table %I.%I drop column if exists transform_geom',schema_name,table_name);execute format('alter table %I.%I add column transform_geom geometry(%s,%s)',schema_name,table_name,geom_type,_target_srid);execute format('create temp table _split_result(rec_ctid tid,geom_path integer[],source_geom geometry(Point,%s),target_geom geometry(Point,%s)) on commit drop',_source_srid,_target_srid);raise notice '正在将图形拆分成点...';--图形字段非空，将其拆分成点，存入临时表execute format('insert into _split_result(rec_ctid,geom_path,source_geom) SELECT ctid,(pt).path,(pt).geom FROM (SELECT ctid, ST_DumpPoints(%I) AS pt FROM %I.%I where ST_IsEmpty(%I)=false) as dump_points',geom_name,schema_name,table_name,geom_name);raise notice '图形拆分成点完成！';--临时表建立索引raise notice '对拆分成点后的数据集建索引...';create index _split_result_ctid_idx on _split_result using btree(rec_ctid);raise notice '对拆分成点后的数据集建索引完成！';--批量转换，从souce源转到target记录raise notice '对拆分点进行偏移计算...';execute format('update _split_result set target_geom=%s(source_geom)',transform_function_name);raise notice '对拆分点进行偏移计算完成！';raise notice '偏移计算结果拼装原图形...';--转换完成后，拼装还原更改原表case geom_typewhen 'POINT' thenexecute format('update %I.%I t1 set transform_geom=t2.target_geom from _split_result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'MULTIPOINT' thenexecute format('with _result as (select rec_ctid,ST_Multi(ST_Union(target_geom)) as geom from _split_result group by rec_ctid) update %I.%I t1 set transform_geom=t2.geom from _result t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'LINESTRING' then_init:=true;for rec in select * from _split_result order by rec_ctid,geom_path loopif(_init=true) thenbeforerec:=rec;_init:=false;continue;end if;if(beforerec.rec_ctid!=rec.rec_ctid) thenexecute format('update %I.%I set transform_geom=$1 where ctid=$2',schema_name,table_name) using _line,beforerec.rec_ctid;--之前与之后的记录，同属一个rec_ctidelseif(rec.geom_path[1]=2) then_line=ST_MakeLine(beforerec.target_geom,rec.target_geom);else_line:=ST_AddPoint(_line,rec.target_geom);end if;end if;beforerec:=rec;end loop;execute format('update %I.%I set transform_geom=$1 where ctid=$2',schema_name,table_name) using _line,beforerec.rec_ctid;when 'MULTILINESTRING' thenexecute format('create temp table temp_linestring(gid serial,rec_ctid tid,line geometry(LineString,%s)) on commit drop',_target_srid);--建立索引create index temp_linestring_ctid_idx on temp_linestring using btree(rec_ctid);_init:=true;for rec in select * from _split_result order by rec_ctid,geom_path loopif(_init=true) thenbeforerec:=rec;_init:=false;continue;end if;--如果 记录数 或者 图形序号 不一致if(beforerec.rec_ctid!=rec.rec_ctid or beforerec.geom_path[1]!=rec.geom_path[1]) thenexecute format('insert into  temp_linestring(rec_ctid,line) values($1,$2)') using beforerec.rec_ctid,_line;--之前与之后的记录，同属一个rec_ctidelseif(rec.geom_path[2]=2) then_line=ST_MakeLine(beforerec.target_geom,rec.target_geom);else_line:=ST_AddPoint(_line,rec.target_geom);end if;end if;beforerec:=rec;end loop;execute format('insert into  temp_linestring(rec_ctid,line) values($1,$2)') using beforerec.rec_ctid,_line;--对临时linestring表聚合成Multilingstringexecute format('update %I.%I t1 set transform_geom=t2.geom from (select rec_ctid,ST_Multi(ST_Union(line)) as geom from  temp_linestring group by rec_ctid) t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'POLYGON' then--isoutlinestring为true代表外环，false是内环execute format('create temp table temp_outerlinestring(rec_ctid tid,line geometry(LineString,%s)) on commit drop',_target_srid);--建立索引create index temp_outerlinestring_ctid_idx on temp_outerlinestring using btree(rec_ctid);execute format('create temp table temp_interiorlinestrings(rec_ctid tid,line geometry(LineString,%s)) on commit drop',_target_srid);--建立索引create index temp_interiorlinestrings_ctid_idx on temp_interiorlinestrings using btree(rec_ctid);_init:=true;for rec in select * from _split_result order by rec_ctid,geom_path loopif(_init=true) thenbeforerec:=rec;_init:=false;continue;end if;--如果 记录数 或者 图形序号 不一致if(beforerec.rec_ctid!=rec.rec_ctid or beforerec.geom_path[1]!=rec.geom_path[1]) then--=1是外环if(beforerec.geom_path[1]=1) thenexecute format('insert into temp_outerlinestring(rec_ctid,line) values($1,$2)') using beforerec.rec_ctid,_line;elseexecute format('insert into temp_interiorlinestrings(rec_ctid,line) values($1,$2)') using beforerec.rec_ctid,_line;end if;--之前与之后的记录，同属一个rec_ctidelseif(rec.geom_path[2]=2) then_line=ST_MakeLine(beforerec.target_geom,rec.target_geom);else_line:=ST_AddPoint(_line,rec.target_geom);end if;end if;beforerec:=rec;end loop;--=1是外环if(beforerec.geom_path[1]=1) thenexecute format('insert into temp_outerlinestring(rec_ctid,line) values($1,$2)') using beforerec.rec_ctid,_line;elseexecute format('insert into temp_interiorlinestrings(rec_ctid,line) values($1,$2)') using beforerec.rec_ctid,_line;end if;--对临时linestring表聚合成Polygonexecute format('update %I.%I t1 set transform_geom=case when t2.interiorlinestrings is null then ST_MakePolygon(t2.outerlinestring) else ST_MakePolygon(t2.outerlinestring,t2.interiorlinestrings) end from (select t1.rec_ctid,t1.line as outerlinestring,t2.interiorlinestrings from temp_outerlinestring t1 left join (select rec_ctid,array_agg(line) as interiorlinestrings from temp_interiorlinestrings group by rec_ctid) t2 on t1.rec_ctid=t2.rec_ctid) t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);when 'MULTIPOLYGON' then--isoutlinestring为true代表外环，false是内环execute format('create temp table temp_outerlinestring(rec_ctid tid,polygon_idx int,line geometry(LineString,%s)) on commit drop',_target_srid);--建立索引create index temp_outerlinestring_ctid_idx on temp_outerlinestring using btree(rec_ctid);execute format('create temp table temp_interiorlinestrings(rec_ctid tid,polygon_idx int,line geometry(LineString,%s)) on commit drop',_target_srid);--建立索引create index temp_interiorlinestrings_ctid_idx on temp_interiorlinestrings using btree(rec_ctid);execute format('create temp table temp_polygons(rec_ctid tid,polygon geometry(MultiPOLYGON,%s)) on commit drop',_target_srid);--建立索引create index temp_polygons_ctid_idx on temp_polygons using btree(rec_ctid);_init:=true;for rec in select * from _split_result order by rec_ctid,geom_path loopif(_init=true) thenbeforerec:=rec;_init:=false;continue;end if;--如果 记录数 或者 图形序号 不一致if(beforerec.rec_ctid!=rec.rec_ctid or beforerec.geom_path[1]!=rec.geom_path[1] or beforerec.geom_path[2]!=rec.geom_path[2]) then--=1是外环if(beforerec.geom_path[2]=1) thenexecute format('insert into temp_outerlinestring(rec_ctid,polygon_idx,line) values($1,$2,$3)') using beforerec.rec_ctid,beforerec.geom_path[2],_line;elseexecute format('insert into temp_interiorlinestrings(rec_ctid,polygon_idx,line) values($1,$2,$3)') using beforerec.rec_ctid,beforerec.geom_path[2],_line;end if;--之前与之后的记录，同属一个rec_ctidelseif(rec.geom_path[3]=2) then_line=ST_MakeLine(beforerec.target_geom,rec.target_geom);else_line:=ST_AddPoint(_line,rec.target_geom);end if;end if;beforerec:=rec;end loop;--=1是外环if(beforerec.geom_path[2]=1) thenexecute format('insert into temp_outerlinestring(rec_ctid,polygon_idx,line) values($1,$2,$3)') using beforerec.rec_ctid,beforerec.geom_path[2],_line;elseexecute format('insert into temp_interiorlinestrings(rec_ctid,polygon_idx,line) values($1,$2,$3)') using beforerec.rec_ctid,beforerec.geom_path[2],_line;end if;--写入临时 polygon表insert into  temp_polygons(rec_ctid,polygon) select t1.rec_ctid,ST_Multi(ST_Union(t1.geom)) from (select t.rec_ctid,case when t.interiorlinestrings is null then ST_MakePolygon(t.outerlinestring) else ST_MakePolygon(t.outerlinestring,t.interiorlinestrings) end as geom from (select t1.rec_ctid,t1.line as outerlinestring,t2.interiorlinestrings from temp_outerlinestring t1 left join (select rec_ctid,array_agg(line) as interiorlinestrings from temp_interiorlinestrings group by rec_ctid) t2 on t1.rec_ctid=t2.rec_ctid) t) t1 group by t1.rec_ctid;--对临时linestring表聚合成MultiPolygonexecute format('update %I.%I t1 set transform_geom=t2.polygon from temp_polygons t2 where t1.ctid=t2.rec_ctid',schema_name,table_name);elseraise notice '不是当前支持的图形类型！';return 'failed';end case;   raise notice '偏移计算结果拼装原图形完成！'; return 'success';
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE STRICT;

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