Yes. Expect one is all I can say, but not at liberty to talk about the
details right now.
________________________________
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of mark
balman
Sent: Tuesday, March 10, 2009 9:38 AM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Help with query
Hi Regina
Many thanks to your prompt answer, the query works great now! In my
query the coordinates were in Plate Carree metres and I think I confused
myself with the transform function. Much appreciated, any news on the
proposed postgis book?
Cheers
Mark
On Tue, Mar 10, 2009 at 12:16 PM, Obe, Regina
<robe....@cityofboston.gov> wrote:
Mark,
I'm a bit confused, for your second query, are those points
suppose to represent user input and in long lat? They don't look like
long lat. If they are meant to be long lat, then your args are just
backwards.
The basic idea I think you want to do is
1) Take user input which I presume is in 4326 and then transform
it to Plate Carree to match your existing data?
Note ST_GeomFromText doesn't transform anything it simply states
this data is in long lat and then transform changes the coordinates to
Plate Carree
So should be
ST_Intersects(pas_nat_iv_pnt.the_geom
,ST_Transform(ST_GeomFromText(userinput,4326), 32662) )
Hope that helps,
Regina
________________________________
From: postgis-users-boun...@postgis.refractions.net
[mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of mark
balman
Sent: Tuesday, March 10, 2009 7:04 AM
To: postgis-users@postgis.refractions.net
Subject: [postgis-users] Help with query
Hi all
I am trying to create a query that returns the features
intersected by a user defined area. I can do this with the following
query which works fine and returns what I want:
select areaname, country
FROM pas_nat_iv_pnt
where ST_Intersects(pas_nat_iv_pnt.the_geom ,
ST_GeomFromText('POLYGON((-7726647.392661 408830.119563 ,
-6918290.736304 408830.119563 , -6918290.736304 828801.112346
,
-7726647.392661 828801.112346 , -7726647.392661 408830.119563
))' , 32662) )
However, what I need to do is to have a user enter latitude and
longitude values and then transform these into Plate Carree coordinates,
I have tried the following query:
select areaname, country
FROM pas_nat_iv_pnt
where ST_Intersects(pas_nat_iv_pnt.the_geom ,
transform(ST_GeomFromText('POLYGON((-7726647.392661 408830.119563 ,
-6918290.736304 408830.119563 , -6918290.736304 828801.112346 ,
-7726647.392661 828801.112346 , -7726647.392661 408830.119563 ))' ,
32662),4326))
The query runs but returns no rows.. I would be most grateful if
anyone could enlighten me on what is wrong and what I need to change.
TIA
Mark
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