[postgis-users] Forming a BAND around a linestring

[pcreso at pcreso.com]

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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