St_intersects using GeometryCollection

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St_intersects using GeometryCollection

Nick Ward

Hello,

 

I need to be able to perform an ST_intersects with a geometry that could be a GeometryCollection.

I understand this is not supported from the PostGis documentation so I have written this query:

 

select t.geometry

from schema.table t

where (st_intersects(t.geometry, st_collectionextract( st_geometryfromtext(@geometrycollection, 27700),1))  --points

or st_intersects(t.geometry, st_collectionextract( st_geometryfromtext(@geometrycollection, 27700),2))             --lines

or st_intersects(t.geometry, st_collectionextract( st_geometryfromtext(@geometrycollection, 27700),3))             --polygons

);

 

Where geometrycollection will be something like 'GEOMETRYCOLLECTION (POINT (290099.9 91499.9), LINESTRING (290099.9 91499.9, 291100.1 91499.9, 291100.1 92500.1, 290099.9 92500.1), POLYGON ((303000 88000, 307000 88000, 307000 84000, 303000 84000, 303000 88000)))'

 

I have a couple of questions:

 

Is this the best way to do this? (other people must be doing it?)

Am I missing something as if this works why isn’t it a built in function in PostGis?

 

Any feedback greatly appreciated,

Regards

Nick

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