a particular wgs 84 bounding box and then unions with <xref linkend="RT_ST_Union" /> the intersecting tiles together returning all bands, transforms to user specified projection using <xref linkend="RT_ST_Transform" />,
and then outputs the results as a png using <xref linkend="RT_ST_AsPNG" />.</p>
<programlisting>
-<![CDATA[
-<?php
+<![CDATA[<?php
$conn_str ='dbname=mydb host=localhost port=5432 user=myuser password=mypwd';
$dbconn = pg_connect($conn_str);
header('Content-Type: image/png');
$sql = "set bytea_output='escape';
SELECT ST_AsPNG(ST_Transform(
ST_AddBand(ST_Union(rast,1), ARRAY[ST_Union(rast,2),ST_Union(rast,3)])
- ,$input_srid) ) As web_merc
+ ,$input_srid) ) As new_rast
FROM aerials.boston
WHERE
ST_Intersects(rast, ST_Transform(ST_MakeEnvelope(-71.1217, 42.227, -71.1210, 42.218,4326),26986) )";