[postgis-users] [Bulk] Re: Converting meters to another unit

[Richard Gomes]

Hi Leo,

Thanks a lot for your prompt answer.
Your book definitely helps a lot!

Thanks and regards,

Richard Gomes
http://www.jquantlib.org/index.php/User:RichardGomes
twitter: frgomes

JQuantLib is a library for Quantitative Finance written in Java.
http://www.jquantlib.com/
twitter: jquantlib


On 04/04/11 06:30, Paragon Corporation wrote:
> Richard,
> Are you points in longitude, latitude.  If they are the best place to 
> start might be using the geography type.  This requires using PostGIS 1.5+
> http://www.postgis.org/documentation/manual-1.5SVN/ch04.html#PostGIS_Geography
> You can also read the free chapter of our book which covers this in 
> some detail.
> http://www.postgis.us/chapter_01
> Leo
> http://www.postgis.us
>
> ------------------------------------------------------------------------
> *From:* postgis-users-bounces at postgis.refractions.net 
> [mailto:postgis-users-bounces at postgis.refractions.net] *On Behalf Of 
> *Richard Gomes
> *Sent:* Monday, April 04, 2011 12:46 AM
> *To:* postgis-users at postgis.refractions.net
> *Subject:* [postgis-users] Converting meters to another unit
>
> Hi All,
>
> I'm a newbie on PostGIS and GIS in general.
>
> Reading section "Taking Advantages of Indexes" at
> http://postgis.refractions.net/docs/ch04.html#id2638955
>
> ... I became confused regarding how I could retrieve points which are 
> distant up to 500 meters from a given point.
> The question is actually how I can transform 500 meters onto some some 
> other figure on a unit I don't understand very well what it is about. 
> I need this calculation in order to determine a Box3d like the article 
> suggests.
>
> Thanks a lot and regards,
>
> -- 
> Richard Gomes
>
>
>
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