SDE 空間表操做

1. 建立空間表（包含st_geometry屬性字段）

CREATE TABLE sensitive_areas (area_id integer, name varchar(128), 
area_size float, type varchar(10), zone sde.st_geometry);

 

2. 建立空間參考

   （1）查詢空間參考表，是否存在

select * from SDE.ST_SPATIAL_REFERENCES

   （2）建立空間參考   --這裏是GCS_WGS_1984座標系，注意 srid 不能和已有的座標系重複

insert into SDE.ST_SPATIAL_REFERENCES (SR_NAME, SRID, X_OFFSET, Y_OFFSET, XYUNITS, Z_OFFSET, Z_SCALE, M_OFFSET, M_SCALE, MIN_X, MAX_X, MIN_Y, MAX_Y, MIN_Z, MAX_Z, MIN_M, MAX_M, CS_ID, CS_NAME, CS_TYPE, ORGANIZATION, ORG_COORDSYS_ID, DEFINITION, DESCRIPTION)
values ('GCS_WGS_1984', 0, -400, -400, 1000000000, -100000, 10000, -100000, 10000, -180, 180, -90, 90, 0, 0, 0, 0, 4326, 'GCS_WGS_1984', 'GEOGRAPHIC', 'GCS_WGS_1984', null, 'GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]', 'Default Spatial Reference SRID 0');

 

3. 插入數據 （注意座標系代碼要和咱們上面建立的保持一致，這裏爲 0）

  （1）點對象

INSERT INTO SENSITIVE_AREAS (area_id, name, area_size, type, zone)
VALUES (1, 'Summerhill Elementary School', 67920.64, 'school', sde.ST_PointFromText('point(112.32 22.43)',0));

   （2）線對象

INSERT INTO SENSITIVE_AREAS (area_id, name, area_size, type, zone)
VALUES (1, 'Summerhill Elementary School', 67920.64, 'school', sde.ST_LineFromText('linestring(112.32 22.43, 112.56 22.31, 112.62 22.78)', 0));

   （3）面對象

INSERT INTO SENSITIVE_AREAS (area_id, name, area_size, type, zone)
VALUES (1, 'Summerhill Elementary School', 67920.64, 'school', sde.ST_PolyFromText('polygon((112.32 22.43, 112.56 22.31, 112.62 22.78, 112.32 22.43))', 1));

 

4. 建立空間索引

CREATE INDEX sa_idx ON sensitive_areas(zone)
INDEXTYPE IS sde.st_spatial_index
PARAMETERS('st_grids=1,3,0 st_srid=0');

 

5. 其它數據操做

  （1）更新空間字段

UPDATE sensitive_areas
SET zone = sde.st_pointfromtext('point(18 57)', 1) 
WHERE area_id = 102;

   （2）刪除一條記錄（和其它空間表進行空間分析）

DELETE FROM sensitive_areas WHERE names
(SELECT sa.names 
FROM sensitive_areas sa, hazardous_sites hs
WHERE sde.st_overlaps (sa.zone, sde.st_buffer (hs.location,.01)) = 1);