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geoinf15:postgis1
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geoinf15:postgis1 [2015/11/03 22:31] oertz created |
geoinf15:postgis1 [2018/05/16 10:05] |
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| - | ====== Spatial Query Language :: Part1 ====== | ||
| - | Créer une //géotable// : | ||
| - | <code> | ||
| - | CREATE TABLE test (id serial PRIMARY KEY, genre text); | ||
| - | SELECT AddGeometryColumn( 'test', 'the_geom', -1, 'GEOMETRY', 2 ); | ||
| - | </code> | ||
| - | Alimenter la table avec quelques géométries //en dur// et pas vraiment "spatiales" (SRS = -1 !!): | ||
| - | <code> | ||
| - | INSERT INTO test VALUES ( 3, 'batiment1', ST_GeometryFromText( 'POLYGON((10 10,40 20,35 8,12 4,10 10))', -1 ) ); | ||
| - | INSERT INTO test VALUES ( 4, 'batiment2', ST_GeometryFromText( 'POLYGON((10 40,20 30,30 40,40 35,50 60,35 80,20 60,10 40))', -1 ) ); | ||
| - | INSERT INTO test VALUES ( 5, 'batiment3', ST_GeometryFromText( 'POLYGON((10 95,20 95,20 135,10 135,10 95))', -1 ) ); | ||
| - | |||
| - | INSERT INTO test VALUES ( 1, 'pieton1', ST_GeometryFromText( 'POINT(10 70)', -1 ) ); | ||
| - | INSERT INTO test VALUES ( 2, 'pieton2', ST_GeometryFromText( 'POINT(30 30)', -1 ) ); | ||
| - | INSERT INTO test VALUES ( 6, 'pieton3', ST_GeometryFromText( 'POINT(35 70)', -1 ) ); | ||
| - | INSERT INTO test VALUES ( 7, 'pieton4', ST_GeometryFromText( 'POINT(35 60)', -1 ) ); | ||
| - | |||
| - | INSERT INTO test VALUES ( 8, 'bordureRoute1', ST_GeometryFromText( 'LINESTRING(1 85,50 85)', -1 ) ); | ||
| - | INSERT INTO test VALUES ( 9, 'bordureRoute2', ST_GeometryFromText( 'LINESTRING(1 92,50 92)', -1 ) ); | ||
| - | </code> | ||
| - | ===== Premiers pas ===== | ||
| - | (-> cf. documentation [[http://postgis.net/docs/manual-2.0/reference.html|PostGIS Reference]]) | ||
| - | - Quelles sont les aires des objets ? -> ST_Area2d<code>...</code> | ||
| - | - Quel sont les types géométriques des objets ? -> Geometrytype<code>...</code> | ||
| - | - Quel est l'objet géométrique le plus proche du pieton 2 ? -> ST_Distance<code>...</code> | ||
| - | - Qui est dans le bâtiment 2 ? -> ST_Within<code>...</code> | ||
| - | |||
| - | //(source: [[http://www.davidgis.fr|Jean David Techer]])// | ||
geoinf15/postgis1.txt · Last modified: 2018/05/16 10:05 (external edit)
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