[postgis-users] RE: RE: RE: Select Point or PolyGon Polyline in Box
anhtin
anhtin at gmail.com
Thu Apr 12 19:39:12 PDT 2007
thanks very much all support to me :)
i still understand in Select point with PolyLine with command :
when i run
SELECT * FROM mainroad WHERE GeomFromText('POINT(517651 2121421)', 42102) &&
the_geom
Have some result
if have assgin to add the command:
AND distance(BuildArea(the_geom),
GeomFromText('POINT(517651 2121421)', 42102)) = 0
but it no result ????? i dont understand this command
Obe, Regina DND\MIS wrote:
>
> To find the polygon where a point resides - there are actually several
> ways of doing this and I'm not sure which one is fastest or the
> preferred. There is (in these I am assuming the_poly is the polygon
> geometry)
>
> I usually just do the first because it is pretty all purpose for most of
> the things I do and you don't have to think about the order of arguments
> in distance like you have to in within)
>
> SELECT *
> FROM polygon WHERE GeomFromText('POINT(295149 2315499)', -1) && the_poly
> AND distance(the_poly, GeomFromText('POINT(295149 2315499)', -1)) = 0
>
> There is also
>
> SELECT *
> FROM polygon WHERE GeomFromText('POINT(295149 2315499)', -1) && the_poly
> AND Within(GeomFromText('POINT(295149 2315499)', -1),the_poly)
>
>
> For Poly Line's it's a little trickier because there is no such thing in
> postgis lingo for Polyline. I think the closest is Linestring or
> MultiLineString. So if you have a linestring or multilinestring that
> forms a polyline, I'm not sure if you would have to convert it to a
> polygon using buildarea to get what you want or if you can get away with
> some other relational operator to do it without conversion. NOTE: I
> have never tried this before - this is simply a guess on my part
>
> the_polyline is a linestring or multilinestring.
>
>
> SELECT *
> FROM polylines WHERE GeomFromText('POINT(295149 2315499)', -1) &&
> the_polyline AND distance(BuildArea(the_polyline),
> GeomFromText('POINT(295149 2315499)', -1)) = 0
>
> OR
>
> SELECT *
> FROM polylines WHERE GeomFromText('POINT(295149 2315499)', -1) &&
> the_polyline AND Within(GeomFromText('POINT(295149 2315499)',
> -1),BuildArea(the_polyline))
>
>
>
>
>
>
> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
> anhtin
> Sent: Wednesday, April 11, 2007 11:40 PM
> To: postgis-users at postgis.refractions.net
> Subject: [postgis-users] RE: RE: Select Point or PolyGon Polyline in Box
>
>
> Thanks very much so support for me
>
> if i have that point i want select this point be in Polygon
> ex: i have table Polygon is province. i want select point(295054
> 849444) be
> in Polygon ????
> and or be in polyline
> can u show 2 way with polygon and polyline
> thanks befor :)
>
>
>
> Obe, Regina DND\MIS wrote:
>>
>> Don't quite get what you are asking? Are you trying to compare if 2
>> points are the same or if a point is within x distance of another
> point?
>> or something entirely different?
>>
>> If you wanted to select all points within x distance of your reference
>> point , then it would be (again replace -1 with the correct SRID and
>> distance is always measured in the units of your spatial reference
>> system)
>>
>> SELECT *
>> FROM pointdemo
>> WHERE the_point && Expand(GeomFromText('POINT(295149 2315499)', -1),
> 10)
>> AND
>> distance(the_point,GeomFromText('POINT(295149 2315499)', -1)) <=
>> 10
>>
>> If you wanted to know if 2 points are the same then it would be
>> SELECT *
>> FROM pointdemo
>> WHERE the_point ~= GeomFromText('POINT(295149 2315499)', -1)
>>
>>
>>
>>
>> -----Original Message-----
>> From: postgis-users-bounces at postgis.refractions.net
>> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
>> anhtin
>> Sent: Wednesday, April 11, 2007 12:32 AM
>> To: postgis-users at postgis.refractions.net
>> Subject: [postgis-users] RE: Select Point or PolyGon Polyline in Box
>>
>>
>> thanks
>> How is Select if it is Point ?????
>>
>>
>>
>> Obe, Regina DND\MIS wrote:
>>>
>>> Assuming your box is in the same srid as your points. It would be
>>> something like
>>>
>>> SELECT *
>>> FROM pointdemo
>>> WHERE the_point && setsrid('BOX(295149 2315499, 465992
>>> 2163790)'::box2d, -1)
>>>
>>>
>>> Note - above I am assuming your point geometry is called the_point
> and
>>> your SRID is -1
>>> If the srid of your point geometry is not -1 then change -1 to what
>> it
>>> should be.
>>>
>>>
>>> -----Original Message-----
>>> From: postgis-users-bounces at postgis.refractions.net
>>> [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
>>> anhtin
>>> Sent: Tuesday, April 10, 2007 6:18 AM
>>> To: postgis-users at postgis.refractions.net
>>> Subject: [postgis-users] Select Point or PolyGon Polyline in Box
>>>
>>>
>>> hi all
>>> i have question to postgis
>>> i have table Pointdemo
>>> I want select all point in my Box("Rectangle") on PostGis
>>> my box is corrdinate
>>> ex: full extend is:Box(110638 2587481, 903350 1972446) ---> xmin
> ymin,
>>> xmax
>>> ymax
>>> i want select point in Box(295149 2315499, 465992 2163790) ---> xmin
>>> ymin,
>>> xmax ymax
>>> How will i do that ?????
>>>
>>>
>>> --
>>> View this message in context:
>>>
>>
> http://www.nabble.com/Select-Point-or-PolyGon-Polyline-in-Box-tf3552167.
>>> html#a9916986
>>> Sent from the PostGIS - User mailing list archive at Nabble.com.
>>>
>>> _______________________________________________
>>> postgis-users mailing list
>>> postgis-users at postgis.refractions.net
>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>>
>>> -----------------------------------------
>>> The substance of this message, including any attachments, may be
>>> confidential, legally privileged and/or exempt from disclosure
>>> pursuant to Massachusetts law. It is intended
>>> solely for the addressee. If you received this in error, please
>>> contact the sender and delete the material from any computer.
>>>
>>> _______________________________________________
>>> postgis-users mailing list
>>> postgis-users at postgis.refractions.net
>>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>>
>>>
>>
>> --
>> View this message in context:
>>
> http://www.nabble.com/Select-Point-or-PolyGon-Polyline-in-Box-tf3552167.
>> html#a9933066
>> Sent from the PostGIS - User mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users at postgis.refractions.net
>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users at postgis.refractions.net
>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>>
>>
>
> --
> View this message in context:
> http://www.nabble.com/Select-Point-or-PolyGon-Polyline-in-Box-tf3552167.
> html#a9952489
> Sent from the PostGIS - User mailing list archive at Nabble.com.
>
> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users
> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users
>
>
--
View this message in context: http://www.nabble.com/Select-Point-or-PolyGon-Polyline-in-Box-tf3552167.html#a9972005
Sent from the PostGIS - User mailing list archive at Nabble.com.
More information about the postgis-users
mailing list