[postgis-users] Forming a BAND around a linestring

[Ed Linde]

Thanks for the tip! Do you recommend a "suitable projection" for the buffer
operation that will not produce distorted buffers?

On Fri, Mar 2, 2012 at 7:15 PM, <pcreso at pcreso.com> wrote:

> ST_Buffer(<linestring>, distance)
>
> http://www.postgis.org/docs/ST_Buffer.html
>
>
> Note that if your data is lat/long (such as EPSG:4326) with units in
> degrees, then you will get somewhat distorted buffer distances, and a
> better result by transforming your linestring to a more suitable projection
> for the buffer operation, then transform it back.
>
> eg:
>
> ST_Transform(ST_Buffer(ST_Transform(<linestring>, SRID), distance),4326)
>
> HTH,
>
>    Brent Wood
> --- On *Fri, 3/2/12, Ed Linde <edolinde at gmail.com>* wrote:
>
>
> From: Ed Linde <edolinde at gmail.com>
> Subject: [postgis-users] Forming a BAND around a linestring
> To: "PostGIS Users Discussion" <postgis-users at postgis.refractions.net>
> Date: Friday, March 2, 2012, 11:17 PM
>
>
> Hi All,
> I have a set of points with (x,y) co-ordinates that belong to a single
> object ex: a segment in a road network.
> If we made a LINESTRING that connected these points (x,y), then I would
> like to have a BAND or RANGE
> around the linestring of say 10 meters wide that would probably make it
> look more like a polygon or some
> area. How can I achieve this in postgis 2.0? Do I need to use some library
> like GDAL in order to achieve this?
>
> Cheers,
> Ed
>
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