This page describes the join of ccm21.catchments with the clc

-- Un essai sur la Bretagne pour voir
DROP TABLE IF EXISTS clc.clipped_bretagne;
CREATE TABLE clc.clipped_bretagne AS
SELECT intersected.clcgid, intersected.gid, clipped_geom
FROM (SELECT clc.gid as clcgid, c.gid, ST_Multi(ST_Intersection(clc.the_geom, c.the_geom)) AS clipped_geom
        FROM  clc.clc00_v2_europe clc INNER JOIN ccm21.catchments c
        ON  ST_Intersects (c.the_geom,clc.the_geom)
        WHERE c.wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne')
        AND substring(code_00 from 1 for 1)='1')  AS intersected;--3721 lines   
ALTER TABLE clc.clipped_bretagne add column id serial PRIMARY KEY;
-- ajout dans la table geometry_columns pour référencement rapide sous Qgis
INSERT INTO geometry_columns(f_table_catalog, f_table_schema, f_table_name, f_geometry_column, coord_dimension, srid, "type")
SELECT '', 'clc', 'clipped_bretagne', 'the_geom', ST_CoordDim(clipped_geom), ST_SRID(clipped_geom), MULTIPOLYGON
FROM clc.clipped_bretagne  LIMIT 1;

-- il ne s'affiche pas... essai réduit OK
DROP TABLE IF EXISTS clc.clipped_bretagne;
CREATE TABLE clc.clipped_bretagne AS
SELECT clc.gid as clcgid,c.gid, clc.the_geom FROM clc.clc00_v2_europe clc INNER JOIN ccm21.catchments c
        ON  ST_Intersects (c.the_geom,clc.the_geom)
        WHERE c.wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne')
        AND substring(code_00 from 1 for 1)='1';
ALTER TABLE clc.clipped_bretagne add column id serial PRIMARY KEY;

-- la requete globale
SELECT intersected.clcgid, intersected.gid, clipped_geom
FROM (SELECT clc.gid as clcgid, c.gid, ST_Intersection(clc.the_geom, c.the_geom) AS clipped_geom
        FROM  clc.clc00_v2_europe clc INNER JOIN ccm21.catchments c
        ON  ST_Intersects (c.the_geom,clc.the_geom)
        where substring(code_00 from 1 for 1)='1' )  AS intersected;            

-- script de départ (modifié ensuite)
CREATE TABLE clc.clipped_bretagne AS
SELECT intersected.clcgid, intersected.gid, clipped_geom
FROM (SELECT clc.gid as clcgid, c.gid, ST_Multi(ST_Intersection(clc.the_geom, c.the_geom)) clipped_geom
        FROM  clc.clc00_v2_europe clc INNER JOIN ccm21.catchments c
        ON  ST_Intersects (c.the_geom,clc.the_geom)
        WHERE c.wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne')
        AND substring(code_00 from 1 for 1)='1')  AS intersected;--3721 lines  
ALTER TABLE clc.clipped_bretagne add column id serial PRIMARY KEY;

-3721 lines  
ALTER TABLE clc.clipped_bretagne add column id serial PRIMARY KEY;
-- ajout dans la table geometry_columns pour référencement rapide sous Qgis
INSERT INTO geometry_columns(f_table_catalog, f_table_schema, f_table_name, f_geometry_column, coord_dimension, srid, "type")
SELECT '', 'clc', 'clipped_bretagne', 'the_geom', ST_CoordDim(clipped_geom), ST_SRID(clipped_geom), MULTIPOLYGON
FROM clc.clipped_bretagne  LIMIT 1;

-- ci dessous j'essaye d'analyser la structure interne des données pour comprendre quels sont les problèmes

SELECT intersected.clcgid, intersected.gid, intersected.the_geom
FROM (SELECT clc.gid as clcgid, c.gid, CAST(ST_AsText(ST_Multi(ST_Intersection(clc.the_geom, c.the_geom))) as VARCHAR(150)) as the_geom
        FROM  clc.clc00_v2_europe clc INNER JOIN ccm21.catchments c
        ON  ST_Intersects (c.the_geom,clc.the_geom)
        WHERE c.wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne')
        AND substring(code_00 from 1 for 1)='1')  AS intersected;


-- Pour comparaison (ressemble beaucoup)

SELECT CAST(ST_AsText(the_geom) as varchar(150)) from clc.clc00_v2_europe clc limit 20;


-- Je rééssaye
DROP TABLE IF EXISTS clc.clipped_bretagne;
CREATE TABLE clc.clipped_bretagne AS
SELECT intersected.clcgid, intersected.gid, the_geom
FROM (SELECT clc.gid as clcgid, c.gid, ST_Multi(ST_Intersection(clc.the_geom, c.the_geom)) the_geom
        FROM  clc.clc00_v2_europe clc INNER JOIN ccm21.catchments c
        ON  ST_Intersects (c.the_geom,clc.the_geom)
        WHERE c.wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne')
        AND substring(code_00 from 1 for 1)='1')  AS intersected;--3721 lines  
ALTER TABLE clc.clipped_bretagne add column id serial PRIMARY KEY;
-- Here to analyse the structure of data in the created table
SELECT ST_AsText(the_geom) from clc.clipped_bretagne limit 20;

-- celui là marche sur Postgis (et je ne comprends pas ce qui ne marchait pas peut être le as the_geom a la place de the_geom, ou alors mon Qgis....)

-- I'm adding some original data tables restricted for an area for Qgis easy use
-- extraction of a clc table for Britany
DROP TABLE IF EXISTS clc.clc00_v2_Bretagne;
CREATE TABLE clc.clc00_v2_Bretagne AS
SELECT * FROM clc.clc00_v2_europe where gid IN (
SELECT gid FROM  clc.clc00_v2_europe clc JOIN
    (SELECT the_geom FROM france.region where code_reg='53') as sub
    ON ST_Contains(sub.the_geom,clc.the_geom));
ALTER TABLE clc.clc00_v2_Bretagne ADD CONSTRAINT c_pk_gid PRIMARY KEY  (gid);
INSERT INTO geometry_columns(f_table_catalog, f_table_schema, f_table_name, f_geometry_column, coord_dimension, srid, "type")
SELECT '', 'clc', 'clc00_v2_Bretagne', 'the_geom', ST_CoordDim(the_geom), ST_SRID(the_geom), GeometryType(the_geom)
FROM clc.clc00_v2_europe LIMIT 1;

-- Creating a table for riversegments Bretagne

DROP TABLE IF EXISTS ccm21.riversegments_Bretagne;   
CREATE TABLE  ccm21.riversegments_Bretagne AS
    SELECT * FROM ccm21.riversegments
        WHERE wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne');
ALTER TABLE ccm21.riversegments_Bretagne ADD CONSTRAINT c_pk_gid_riversegments_Bretagne PRIMARY KEY  (gid);
INSERT INTO geometry_columns(f_table_catalog, f_table_schema, f_table_name, f_geometry_column, coord_dimension, srid, "type")
SELECT '', 'ccm21', 'riversegments_Bretagne', 'the_geom', ST_CoordDim(the_geom), ST_SRID(the_geom), GeometryType(the_geom)
FROM ccm21.riversegments_Bretagne LIMIT 1;

-- creating a table for catchments Bretagne.
DROP TABLE IF EXISTS ccm21.catchments_Bretagne;   
CREATE TABLE  ccm21.catchments_Bretagne AS
    SELECT * FROM ccm21.catchments
        WHERE wso_id IN (SELECT wso_id FROM france.wso WHERE area='Bretagne');  
ALTER TABLE ccm21.catchments_Bretagne ADD CONSTRAINT c_pk_gid_catchments_Bretagne PRIMARY KEY  (gid);
INSERT INTO geometry_columns(f_table_catalog, f_table_schema, f_table_name, f_geometry_column, coord_dimension, srid, "type")
SELECT '', 'ccm21', 'catchments_Bretagne', 'the_geom', ST_CoordDim(the_geom), ST_SRID(the_geom), GeometryType(the_geom)
FROM ccm21.catchments_Bretagne LIMIT 1;