使用PG處理地圖數據偏移問題

• 問題背景
• • 1.創建數據庫，并新增posgis擴展
  • 2.運行如下sql語句，新增工具函數FreeGIS_Coordinate_Transform
  • 3.使用PostGIS Shapefile Import/Export Manager數據工具導入shp數據源到PG中
  • 4.進行數據轉換

問題背景

進行數據可視化，客戶給的數據是火星偏移經緯度數據，和地圖底圖（wgs84）坐標系不同，因此疊加上去有偏移，因此尋找工具對數據源進行糾偏，找到一個PG工具函數可以進行糾偏，地址：https://github.com/FreeGIS/Postgis_Coordinate_Transform/blob/master/FreeGIS_Coordinate_Transform.sql

1.創建數據庫，并新增posgis擴展

2.運行如下sql語句，新增工具函數FreeGIS_Coordinate_Transform

-- 百度坐標系 (BD-09) 與 火星坐標系 (GCJ-02)的轉換 -- 即 百度 轉 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;--火星坐標系 (GCJ-02) 與百度坐標系 (BD-09) 的轉換 --即谷歌、高德 轉 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轉火星 --即真實的gps坐標 轉 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);--坐標在國外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;--國內坐標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;--火星轉84 --即 谷歌，高德 轉 真實gps坐標 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;--百度轉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--百度先轉火星_gcj_point:=FreeGIS_BD2GCJ(bd_point);--火星轉84wgs_point:=FreeGIS_GCJ2WGS(_gcj_point);return; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE STRICT;--WGS轉百度 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轉火星_gcj_point:=FreeGIS_WGS2GCJ(wgs_point);--火星轉百度bd_point:=FreeGIS_GCJ2BD(_gcj_point);return; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE STRICT;--百度經緯轉百度墨卡托 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;--百度墨卡托轉百度經緯度 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轉百度墨卡托 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轉百度bd_point_4326:=FreeGIS_WGS2BD(wgs_point);bd_point_3857:=FreeGIS_BDWGS2BDMKT(bd_point_4326);return; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE STRICT;--百度墨卡托轉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--百度墨卡托轉百度經緯bd_point_4326:=FreeGIS_BDMKT2BDWGS(bd_point_3857);--百度經緯轉 wgs經緯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');--對表批量進行坐標轉換 CREATE OR REPLACE FUNCTION FreeGIS_Coordinate_Transform(in schema_name text,--轉換表的schema名稱in table_name text,--轉換表名字in transform_type FreeGIS_coordinate_transform_type--轉換類型枚舉型。 ) 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;--對表批量進行坐標轉換 CREATE OR REPLACE FUNCTION _FreeGIS_Coordinate_Transform_1(in schema_name text,--轉換表的schema名稱in table_name text,--轉換表名字in transform_type FreeGIS_coordinate_transform_type--轉換類型枚舉型。 ) RETURNS text As $BODY$ DECLARErec record;geom_name text;geom_type text;transform_function_name text;_source_srid int;_target_srid int; BEGIN--檢查表是否存在select * from pg_tables where schemaname=schema_name and tablename=table_name into rec;if(rec is null) thenraise notice '坐標轉換表不存在，可能scheam或tablename輸入錯誤！';return 'failed';end if;--檢查轉換表是否為空間關系表select * from geometry_columns where f_table_name=table_name and f_table_schema=schema_name into rec;if(rec is null) thenraise notice '當前轉換只支持帶geometry類型的空間關系表！';return 'failed';end if;--檢查圖形維度，當前只支持二維。if(rec.coord_dimension!=2) thenraise notice '當前轉換只支持二維圖形坐標！';return 'failed';end if;--檢查圖形坐標系，當前只支持4326坐標系（除將百度墨卡托轉百度經緯度除外）if(transform_type!='BDMKT2BDWGS' and transform_type!='BDMKT2WGS') thenif(rec.srid!=4326) thenraise notice '當前轉換只支持數據源為WGS84(EPSG:4326)坐標系！';raise notice '其他坐標系建議先自行轉換到4326坐標系，然后使用該腳本進行批量坐標糾正！';return 'failed';end if;else--百度墨卡托轉其他坐標系，轉換方式為BD_MKT2WGS，數據源坐標系應當為3857if(rec.srid!=3857) thenraise notice '百度墨卡托轉其他坐標系，數據源坐標系必須為(EPSG:3857)坐標系！';return 'failed';end if;end if;geom_type:=rec.type;geom_name:=rec.f_geometry_column;--檢查圖形類型，僅僅支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六種明確類型。--類似geometry或者collection類型，由于指定不明確，不太好進行規律轉化。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 '當前轉換只支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六種基本圖形類型！';return 'failed';end if;--轉換函數名稱拼接transform_function_name:='FreeGIS_'||transform_type;--圖形拆分成點，點圖形 進行坐標 偏移轉換。--轉換表新建轉換結果字段，對原圖形字段拆分，創建臨時表存儲拆分結果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 '正在將圖形拆分成點...';--圖形字段非空，將其拆分成點，存入臨時表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 '圖形拆分成點完成！';--臨時表建立索引raise notice '對拆分成點后的數據集建索引...';create index _split_result_ctid_idx on _split_result using btree(rec_ctid);raise notice '對拆分成點后的數據集建索引完成！';--批量轉換，從souce源轉到target記錄raise notice '對拆分點進行偏移計算...';execute format('update _split_result set target_geom=%s(source_geom)',transform_function_name);raise notice '對拆分點進行偏移計算完成！';raise notice '偏移計算結果拼裝原圖形...';--轉換完成后，拼裝還原更改原表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 '不是當前支持的圖形類型！';return 'failed';end case; raise notice '偏移計算結果拼裝原圖形完成！'; return 'success'; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE STRICT;--對表批量進行坐標轉換 CREATE OR REPLACE FUNCTION _FreeGIS_Coordinate_Transform_2(in schema_name text,--轉換表的schema名稱in table_name text,--轉換表名字in transform_type FreeGIS_coordinate_transform_type--轉換類型枚舉型。 ) 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--檢查表是否存在select * from pg_tables where schemaname=schema_name and tablename=table_name into rec;if(rec is null) thenraise notice '坐標轉換表不存在，可能scheam或tablename輸入錯誤！';return 'failed';end if;--檢查轉換表是否為空間關系表select * from geometry_columns where f_table_name=table_name and f_table_schema=schema_name into rec;if(rec is null) thenraise notice '當前轉換只支持帶geometry類型的空間關系表！';return 'failed';end if;--檢查圖形維度，當前只支持二維。if(rec.coord_dimension!=2) thenraise notice '當前轉換只支持二維圖形坐標！';return 'failed';end if;--檢查圖形坐標系，當前只支持4326坐標系（除將百度墨卡托轉百度經緯度除外）if(transform_type!='BDMKT2BDWGS' and transform_type!='BDMKT2WGS') thenif(rec.srid!=4326) thenraise notice '當前轉換只支持數據源為WGS84(EPSG:4326)坐標系！';raise notice '其他坐標系建議先自行轉換到4326坐標系，然后使用該腳本進行批量坐標糾正！';return 'failed';end if;else--百度墨卡托轉其他坐標系，轉換方式為BD_MKT2WGS，數據源坐標系應當為3857if(rec.srid!=3857) thenraise notice '百度墨卡托轉其他坐標系，數據源坐標系必須為(EPSG:3857)坐標系！';return 'failed';end if;end if;geom_type:=rec.type;geom_name:=rec.f_geometry_column;--檢查圖形類型，僅僅支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六種明確類型。--類似geometry或者collection類型，由于指定不明確，不太好進行規律轉化。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 '當前轉換只支持Point,LineString,Polygon,MultiPoint,MultiLineString,MultiPolygon六種基本圖形類型！';return 'failed';end if;--轉換函數名稱拼接transform_function_name:='FreeGIS_'||transform_type;--圖形拆分成點，點圖形 進行坐標 偏移轉換。--轉換表新建轉換結果字段，對原圖形字段拆分，創建臨時表存儲拆分結果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 '正在將圖形拆分成點...';--圖形字段非空，將其拆分成點，存入臨時表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 '圖形拆分成點完成！';--臨時表建立索引raise notice '對拆分成點后的數據集建索引...';create index _split_result_ctid_idx on _split_result using btree(rec_ctid);raise notice '對拆分成點后的數據集建索引完成！';--批量轉換，從souce源轉到target記錄raise notice '對拆分點進行偏移計算...';execute format('update _split_result set target_geom=%s(source_geom)',transform_function_name);raise notice '對拆分點進行偏移計算完成！';raise notice '偏移計算結果拼裝原圖形...';--轉換完成后，拼裝還原更改原表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;--之前與之后的記錄，同屬一個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 記錄數 或者 圖形序號 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;--之前與之后的記錄，同屬一個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;--對臨時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為true代表外環，false是內環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 記錄數 或者 圖形序號 不一致if(beforerec.rec_ctid!=rec.rec_ctid or beforerec.geom_path[1]!=rec.geom_path[1]) then--=1是外環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;--之前與之后的記錄，同屬一個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是外環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;--對臨時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為true代表外環，false是內環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 記錄數 或者 圖形序號 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是外環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;--之前與之后的記錄，同屬一個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是外環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;--寫入臨時 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;--對臨時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 '不是當前支持的圖形類型！';return 'failed';end case; raise notice '偏移計算結果拼裝原圖形完成！'; return 'success'; END; $BODY$ LANGUAGE 'plpgsql' VOLATILE STRICT;

3.使用PostGIS Shapefile Import/Export Manager數據工具導入shp數據源到PG中

切記SRID需要手動填入4326坐標系編號

4.進行數據轉換

如下是火星轉WGS84

select FreeGIS_Coordinate_Transform('public','表名稱','GCJ2WGS');

總結

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