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PostGIS 1.5.8 Manual15 / 31014. When I do an ST_Intersects, it says my two geometries don’t intersect when I KNOW THEY DO. What gives?This generally happens in two common cases. Your geometry is invalid -- check ST_IsValid or you are assuming theyintersect because ST_AsText truncates the numbers and you have lots of decimals after it is not showing you.
PostGIS 1.5.8 Manual16 / 310Chapter 4Using PostGIS: Data Management and Queries4.1 GIS ObjectsThe GIS objects supported by PostGIS are a superset of the "Simple Features" defined by the OpenGIS Consortium (OGC). Asof version 0.9, PostGIS supports all the objects and functions specified in the OGC "Simple Features for SQL" specification.PostGIS extends the standard with support for 3DZ,3DM and 4D coordinates.4.1.1 OpenGIS WKB and WKTThe OpenGIS specification defines two standard ways of expressing spatial objects: the Well-Known Text (WKT) form and theWell-Known Binary (WKB) form. Both WKT and WKB include information about the type of the object and the coordinateswhich form the object.Examples of the text representations (WKT) of the spatial objects of the features are as follows:• POINT(0 0)• LINESTRING(0 0,1 1,1 2)• POLYGON((0 0,4 0,4 4,0 4,0 0),(1 1, 2 1, 2 2, 1 2,1 1))• MULTIPOINT(0 0,1 2)• MULTILINESTRING((0 0,1 1,1 2),(2 3,3 2,5 4))• MULTIPOLYGON(((0 0,4 0,4 4,0 4,0 0),(1 1,2 1,2 2,1 2,1 1)), ((-1 -1,-1 -2,-2 -2,-2 -1,-1 -1)))• GEOMETRYCOLLECTION(POINT(2 3),LINESTRING(2 3,3 4))The OpenGIS specification also requires that the internal storage format of spatial objects include a spatial referencing systemidentifier (SRID). The SRID is required when creating spatial objects for insertion into the database.Input/Output of these formats are available using the following interfaces:bytea WKB = ST_AsBinary(geometry);text WKT = ST_AsText(geometry);geometry = ST_GeomFromWKB(bytea WKB, SRID);geometry = ST_GeometryFromText(text WKT, SRID);For example, a valid insert statement to create and insert an OGC spatial object would be:INSERT INTO geotable ( the_geom, the_name )VALUES ( ST_GeomFromText(’POINT(-126.4 45.32)’, 312), ’A Place’);
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