[postgis-users] finding whether an object lies in vicinity of another object

[Nicolas Ribot]

Hi,

You should read the first chapters of the Postgis documentation
(http://postgis.org/documentation/manual-2.0/) : it introduces spatial
data, spatial types and functions.
Postgis is working on Geometry type, not on classic, "scalar" attributes.

Nicolas

On 8 October 2012 14:40, tasneem dewaswala <tasneem.europe at gmail.com> wrote:
> Hello,
>
> I am developing an application to find whether two cars are in each other
> communication range or not.
> I have two tables like receiver and transmitter. i would like to know if
> receiver is in 100 meters range of transmitter or not.
> Since i am using PostgreSQL first time, i donno much about its functions and
> commands, but i have found that there is ST_Within(), which can be used for
> my work. I tried but it gives me lot of errors, probably because of data
> types of my latitude and longitude. they are in two different columns with
> datatype as double precision.
>
> please tell me what is wrong, and how should i use ST_WITHIN for my work. Or
> tell me any other way of knowing if two objects are in range of each other.
>
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