[postgis-users] st_offsetcurve
Pedro Costa
pedrocostaarma at sapo.pt
Mon May 14 08:36:02 PDT 2012
Thank you Francois but still error.
Using this:
With my_union as (
select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) my_union_geom
from streets
group by n_street)
select n_street, my_union_geom, ST_Parallel(the_geom,-3.0,0,0) my_single_geom
from my_union a
join streets b on a.n_street = b.n_street
give me this error:
column reference "n_street" is ambiguous
I put the table name but give me another error:
invalid reference to FROM-clause entry for table "my_union"
Em 11-05-2012 11:01, Francois Hugues escreveu:
> Hi,
>
> This error is normal. You can not use a group by clause with an aggregate function and keep all of single records from your original database. Which one will you choose to keep for each unique n-street value ?
>
> To do that you can use two different tricks (but your table will have as many lines as you have unique couple n_street/the_geom):
>
> Using "with" with a join
> With my_union as (
> select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) my_union_geom
> from streets
> group by n_street)
>
> select n_street, my_union_geom, ST_Parallel(the_geom,-3.0,0,0) my_single_geom
> from my_union a
> join streets b on a.n_street = b.n_street
>
> or using an over function (not totally sure of this particular request but the window function can certainly help you in this case)
>
> select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) ,
> ST_Parallel(the_geom,-3.0,0,0))over(partition by n_street)
> from streets
> group by n_street
>
> Hugues.
>
> --
>
> -----Message d'origine-----
> De : postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-bounces at postgis.refractions.net] De la part de Pedro Costa
> Envoyé : vendredi 11 mai 2012 10:30
> À : PostGIS Users Discussion
> Objet : Re: [postgis-users] st_offsetcurve
>
> Ups, sorry...
>
> The whole sql:
>
> create table test4 as
> (select n_street, st_union (ST_Parallel(the_geom,3.0,0,0)) ,
> (ST_Parallel(the_geom,-3.0,0,0))
> from streets
> group by n_street)
>
>
>
> Em 11-05-2012 00:03, Simon Greener escreveu:
>> Pedro,
>>
>>> greate. The funcion works.
>>>
>>> I'm doing something like that:
>>>
>>> ST_Parallel(the_geom,3.0,0,0)
>>>
>>> but give me error:
>>>
>>> column "streetss.the_geom" must appear in the GROUP BY clause or be used
>>> in an aggregate function
>>>
>>> anybody know the problem?
>> Not without the whole SQL statement.
>>
>> S
>>> thanks
>>>
>>>
>>> Em 10-05-2012 04:40, Simon Greener escreveu:
>>>> Folks,
>>>>
>>>> Sorry about that. The file:
>>>>
>>>> http://www.spatialdbadvisor.com/file_download/55/PostGIS_Parallel.sql
>>>>
>>>> Did not contain all the required types and functions. One needed also
>>>> to access the types and functions for my ST_GetVector function.
>>>>
>>>> I have now included all the required types and related functions in
>>>> the above script and replaced it on my site.
>>>>
>>>> I have changed a bit in the code as it didn't handle some situations
>>>> as I expected. Hopefully my test cases give good coverage.
>>>>
>>>> My tests, conducted on PostgreSQL 9.1 and PostGIS 2.0 on Windows 7 64
>>>> Bit all work as this example shows:
>>>>
>>>> With geometries As (
>>>> select ST_GeomFromText('LINESTRING(1 1,1 10)') as geom,
>>>> 10.0 as offset,2 as roundFactor,0 as curved
>>>> union all select ST_GeomFromText('LINESTRING(0 0,1 1,1 2)') as geom,
>>>> 0.5 as offset,2 as roundFactor,
>>>> generate_series(0,1,1) as curved
>>>> union all select ST_GeomFromText('LINESTRING(0.0 0.0, 45.0 45.0, 90.0
>>>> 0.0, 135.0 45.0, 180.0 0.0, 180.0 -45.0, 45.0 -45.0, 0.0 0.0)') as
>>>> geom,
>>>> 10.0 as offset,2 as roundFactor,
>>>> generate_series(0,1,1) as curved
>>>> union all select ST_GeomFromText('MULTILINESTRING((0 0,1 1,1 2),(2 3,3
>>>> 2,5 4))') as geom,
>>>> 0.5 as offsetRight,2 as roundFactor,
>>>> generate_series(0,1,1) as curved
>>>> )
>>>> select ST_AsText(g.geom) as origGeom, g.offset,g.curved,
>>>> ST_AsText(ST_Parallel(g.geom,g.offset,g.roundFactor,g.curved))
>>>> as geomWKTLeft,
>>>>
>>>> ST_AsText(ST_Parallel(g.geom,0.0-g.offset,g.roundFactor,g.curved)) as
>>>> geomWKTRight
>>>> from geometries as g;
>>>>
>>>> "LINESTRING(1 1,1 10)";10.0;0;"LINESTRING(11 1,11 10)";"LINESTRING(-9
>>>> 1,-9 10)"
>>>> "LINESTRING(0 0,1 1,1 2)";0.5;0;"LINESTRING(0.35 -0.35,1.5 0.79,1.5
>>>> 2)";"LINESTRING(-0.35 0.35,0.5 1.21,0.5 2)"
>>>> "LINESTRING(0 0,1 1,1 2)";0.5;1;"COMPOUNDCURVE((0.35 -0.35,1.35
>>>> 0.65),CIRCULARSTRING(1.35 0.65,1.46 0.81,1.5 1),(1.5 1,1.5
>>>> 2))";"LINESTRING(-0.35 0.35,0.5 1.21,0.5 2)"
>>>> "LINESTRING(0 0,45 45,90 0,135 45,180 0,180 -45,45 -45,0
>>>> 0)";10.0;0;"LINESTRING(7.07 -7.07,45 30.86,90 -14.14,135 30.86,170
>>>> -4.14,170 -35,49.14 -35,7.07 7.07)";"LINESTRING(-7.07 7.07,45 59.14,90
>>>> 14.14,135 59.14,190 4.14,190 -55,40.86 -55,-7.07 -7.07)"
>>>> "LINESTRING(0 0,45 45,90 0,135 45,180 0,180 -45,45 -45,0
>>>> 0)";10.0;1;"COMPOUNDCURVE((7.07 -7.07,45 30.86,82.93
>>>> -7.07),CIRCULARSTRING(82.93 -7.07,90 -10,97.07 -7.07),(97.07
>>>> -7.07,134.71 31.15,170 -4.14,170 -35,49.14 -35,7.07
>>>> 7.07))";"COMPOUNDCURVE((-7.07 7.07,37.93 52.07),CIRCULARSTRING(37.93
>>>> 52.07,45 55,52.07 52.07),(52.07 52.07,89.71 13.85,127.93
>>>> 52.07),CIRCULARSTRING(127.93 52.07,135 55,142.07 52.07),(142.07
>>>> 52.07,187.07 7.07),CIRCULARSTRING(187.07 7.07,189.16 4.01,190 0),(190
>>>> 0,190 -45),CIRCULARSTRING(190 -45,187.13 -52.01,180 -55),(180 -55,45
>>>> -55),CIRCULARSTRING(45 -55,41.27 -54.28,37.93 -52.07),(37.93
>>>> -52.07,-7.07 -7.07))"
>>>> "MULTILINESTRING((0 0,1 1,1 2),(2 3,3 2,5
>>>> 4))";0.5;0;"MULTILINESTRING((1.65 2.65,3 1.29,5.35
>>>> 3.65))";"MULTILINESTRING((2.35 3.35,3 2.71,4.65 4.35))"
>>>> "MULTILINESTRING((0 0,1 1,1 2),(2 3,3 2,5 4))";0.5;1;"MULTICURVE((1.65
>>>> 2.65,2.65 1.65),CIRCULARSTRING(2.65 1.65,3 1.5,3.35 1.65),(3.35
>>>> 1.65,5.35 3.65))";"MULTILINESTRING((2.35 3.35,3 2.71,4.65 4.35))"
>>>>
>>>> Sorry for any inconvenience.
>>>>
>>>> The file is available for download via the link above.
>>>>
>>>> regards
>>>> Simon
>>>>
>>>>
>>>> On Wed, 09 May 2012 23:27:04 +1000, Pedro Costa
>>>> <pedrocostaarma at sapo.pt> wrote:
>>>>
>>>>> No problem Hugues.
>>>>>
>>>>> Give me the same error:
>>>>>
>>>>> ERROR: function st_parallel(geometry, numeric, numeric, integer) does
>>>>> not exist
>>>>> LINE 1: select ST_Parallel(the_geom, 3.0, 0.0, 0) as test from tests
>>>>>
>>>>>
>>>>>
>>>>> Em 09-05-2012 13:48, Francois Hugues escreveu:
>>>>>> Sorry, I read your message too fast and forgot the PS.
>>>>>>
>>>>>> Maybe you could try something like :
>>>>>> select ST_Parallel(the_geom, 3.0, 0.0, 0) as test from tests
>>>>>>
>>>>>> Hugues.
>>>>>>
>>>>>>
>>>>>>
>>>>>> -----Message d'origine-----
>>>>>> De : postgis-users-bounces at postgis.refractions.net
>>>>>> [mailto:postgis-users-bounces at postgis.refractions.net] De la part de
>>>>>> Pedro Costa
>>>>>> Envoyé : mercredi 9 mai 2012 13:06
>>>>>> À : PostGIS Users Discussion
>>>>>> Objet : Re: [postgis-users] st_offsetcurve
>>>>>>
>>>>>> Em 09-05-2012 11:28, Pedro Costa escreveu:
>>>>>>> PS: I´m already install the function by your file
>>>>>> I'm already do that...
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