[postgis-users] point in polygon or equivalent

[Paul Ramsey]

select *
from mytable
where mytable.the_geom && geomfromtext('POINT(X Y)',<srid>)
and contains(mytable.the_geom, geomfromtext('POINT(X Y)',<srid>)

On 30-Dec-05, at 6:56 AM, Rhys Stewart wrote:

> actually what I wanted (well I did it in pl/pgsql) is given a table
> and a point determine which record/polygon contains said point.
>
> the function I created is point_in_polygon(easting, northing,  
> table_name)
>
> @strk I don't know any "real" programming like C or stuff, just enough
> PHP & python to see me through the day.
>
>
>
>
> On 12/30/05, strk at refractions.net <strk at refractions.net> wrote:
>> On Fri, Dec 30, 2005 at 04:21:21PM +1100, Rhys Stewart wrote:
>>> Greetings,
>>>
>>> Is there already a way to determine which polygon a certain point
>>> falls in?  Just want to know berfore I start to write a function.
>>
>> ``within(point, polygon)'' is what you're looking for.
>> ``distance(point, polygon) == 0'' could be faster for some cases.
>> Remember to add ``point && polygon'' to improve performance by
>> use of the spatial index (if defined).
>>
>> If you're still willing to code (I hope so) and really
>> want a faster solution check the pt_in_poly_2d() function
>> in lwgeom/measures.c.
>>
>> The function could be invoked as a short-cut when input
>> to within() are Area/Point, but since within() would be
>> robust I'm not sure this is the way to go...
>>
>>
>> --strk;
>>
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>>
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