[postgis-users] st_dist, st_sphere, st_spheroid - overhead/efficiency question

[Bo Coughlin]

right. but the location (in raw original) is: 1442 E FORT AVE  BALTIMORE MD
21230  39.269318 -76.594162
where it is now:
308th Aveu  Gettysburg, SD 57442POINT(-100.000971435723 45.0003533555503)


that's a bad thing...



On Thu, Jul 9, 2009 at 2:06 PM, Paul Ramsey <pramsey at cleverelephant.ca>wrote:

> The coordinates you pasted in are valid points in the continental USA...
>
> select st_srid(the_geom), st_astext(the_geom) from market_locations limit
> 1;
> 4326    POINT(-77.1042756692815 38.995397678429)
>
> select st_srid(the_geom), st_astext(the_geom) from customer_locations limit
> 1;
> 4326    POINT(-100.000971435723 45.0003533555503)
>
> P
>
> On Thu, Jul 9, 2009 at 10:46 AM, Bo Coughlin<bo at rekindl.com> wrote:
> > Hmmm....I just looked again at the points - they no longer match the
> > original lat/lon coordinates, could I have somehow altered these via
> > reprojecting them?
> > Bo Coughlin
> > bo at rekindl.com
> > 704.414.0805
> >
> >
> > On Thu, Jul 9, 2009 at 1:38 PM, Bo Coughlin <bo at rekindl.com> wrote:
> >>
> >> Tried - got nothing returned...little scary. - bo
> >>
> >> Bo Coughlin
> >> bo at rekindl.com
> >> 704.414.0805
> >>
> >>
> >> On Thu, Jul 9, 2009 at 1:16 PM, Paul Ramsey <pramsey at cleverelephant.ca>
> >> wrote:
> >>>
> >>> Try this:
> >>>
> >>> --
> >>> -- ST_DWithin_Sphere(lonlat-point, lonlat-point, radius-in-meters)
> >>> returns boolean
> >>> --
> >>> -- Meters/Degree @ 60N: select 1/distance_sphere('POINT(0
> >>> 60)','POINT(1 60)') = 1.79866403673916e-05
> >>> --
> >>> CREATE OR REPLACE FUNCTION ST_DWithin_Sphere(geometry, geometry,
> float8)
> >>>        RETURNS boolean
> >>>        AS 'SELECT $1 && ST_Expand($2,$3 * 1.79866403673916e-05) AND
> >>> $2 && ST_Expand($1,$3 * 1.79866403673916e-05) AND
> >>> ST_Distance_Sphere($1, $2) < $3'
> >>>        LANGUAGE 'SQL' IMMUTABLE;
> >>>
> >>>
> >>> SELECT m.id AS mid,
> >>> m.building_i AS mb_id,
> >>> c.id AS cid, c.building_i AS cb_id,
> >>> m.streetaddr AS m_address,
> >>> m.city AS m_city,
> >>> m.state AS m_state,
> >>> m.zip AS m_zip,
> >>> m.zip4 AS m_zip4,
> >>> round(CAST(
> >>> ST_Distance_Sphere(m.the_geom, c.the_geom)
> >>> AS numeric), 2) AS dist_meters
> >>> FROM market_locations m, customer_locations c
> >>> WHERE st_dwithin_sphere(m.the_geom, c.the_geom, 2414.016)
> >>> _______________________________________________
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> >>>
> >>
> >
> >
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