[postgis-users] errors while using st_dwithin

[tasneem dewaswala]

Thank you for the suggestion

i tried to use ST_GeographyFromText and ST_GeogFromText
but it gives an error as the function does not exist.

is this because of version problem.

My postgre version is
"PostgreSQL 8.4.14, compiled by Visual C++ build 1400, 32-bit"

and postgis version is
"POSTGIS="1.4.2" GEOS="3.2.0-CAPI-1.6.0" PROJ="Rel. 4.6.1, 21 August 2008"
USE_STATS"

On Thu, Dec 6, 2012 at 10:29 PM, Paul Ramsey <pramsey at opengeo.org> wrote:

> If you want to use angular units (lon/lat) but get back metric
> results, use the geography type, not the geometry type.
> ST_GeogFromText
>
> On Thu, Dec 6, 2012 at 8:56 AM, tasneem dewaswala
> <tasneem.europe at gmail.com> wrote:
> > When i locate this two co-ordinates on google map.
> >  one lat/lon (19.235308 72.977955) is in India while
> > another (56.6647756667,12.877464) is in Sweden,
> > so how can the distance between both of them be 70 meters ?
> >
> >
> > On Thu, Dec 6, 2012 at 9:30 PM, Duncan Golicher <dgolicher at gmail.com>
> wrote:
> >>
> >> The points look about 70m apart to me.
> >>
> >> Duncan
> >>
> >>
> >>
> >> On Thu, Dec 6, 2012 at 8:47 AM, tasneem dewaswala
> >> <tasneem.europe at gmail.com> wrote:
> >> > Hello,
> >> >
> >> > i want to know whether two location's are within 100 meters range of
> >> > each
> >> > other or not.
> >> > i tried using ST_DWITHIN, but its not giving me appropriate answers.
> >> >
> >> > my query is "
> >> >
> >> > select st_dwithin(ST_GeomFromText('POINT(19.235308
> >> > 72.977955)',2163),ST_GeomFromText('POINT(56.6647756667
> >> > 12.877464)',2163),100) as "result";
> >> >
> >> > the result that i get is "t" i.e true, which is logically not correct,
> >> > the
> >> > answer i should get is false, since two locations are far beyond 100
> >> > meters
> >> > range.
> >> >
> >> > Please help me forming an exact query for this.
> >> >
> >> > Regards
> >> > Tasha
> >> >
> >> >
> >> > _______________________________________________
> >> > postgis-users mailing list
> >> > postgis-users at lists.osgeo.org
> >> > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
> >> >
> >>
> >>
> >>
> >> --
> >> Dr Duncan Golicher
> >> Investigador Titular,
> >> El Colegio de la Frontera Sur, Chiapas,Mexico
> >> Mexico tel +52 1 967 137 94 20
> >> Skype name duncangolicher
> >>
> >> Publications: http://www.mendeley.com/profiles/duncan-golicher
> >>
> >> Senior lecturer, Bournemouth University, UK
> >> Centre for Conservation Ecology & Environmental Change
> >> School of Applied Sciences
> >> Christchurch House rm C218a
> >> Bournemouth University
> >> Fern Barrow
> >> Poole (Dorset) BH12 5BB UK
> >> Tel. +44 (0)1202 961682
> >>
> >> For list of publications see Researcher ID:
> >> http://www.researcherid.com/rid/B-4240-2009
> >>
> >> dgolicher at bournemouth.ac.uk
> >> dgoliche at ecosur.mx
> >>
> >> Researcher ID:
> >> http://www.researcherid.com/rid/B-4240-2009
> >> _______________________________________________
> >> postgis-users mailing list
> >> postgis-users at lists.osgeo.org
> >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
> >
> >
> >
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> >
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