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On 02/09/2012 07:19 PM, uk52rob wrote:
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<p class="MsoPlainText">Thanks Andreas, I will give that a go.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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<p><br>
</p>
<p>To expand on Andreas' suggestion here's a PostGIS trigger
function I use to automatically update columns for Lon/Lat and the
X-Y coords for each insert of a new point:</p>
<p><br>
</p>
<p>-- Function: update_lonlat_coords()<br>
-- DROP FUNCTION update_lonlat_coords();<br>
<br>
CREATE OR REPLACE FUNCTION update_lonlat_coords()<br>
RETURNS trigger AS<br>
$BODY$<br>
DECLARE g integer;<br>
BEGIN<br>
g:=NEW.gauge_id;<br>
UPDATE rain_gauges <br>
SET x_coord=ST_X(the_geom), y_coord=ST_Y(the_geom) <br>
WHERE gauge_id=g;<br>
UPDATE rain_gauges <br>
SET lon=ST_X(ST_TRANSFORM(the_geom,4326)),
lat=ST_Y(ST_TRANSFORM(the_geom,4326)) <br>
WHERE gauge_id=g;<br>
RETURN NULL;<br>
END;<br>
$BODY$<br>
LANGUAGE plpgsql VOLATILE<br>
COST 100;<br>
ALTER FUNCTION update_lonlat_coords() OWNER TO flood_dba;</p>
<p><br>
</p>
<p>If you apply this trigger function ON INSERT, then each new point
will automatically have lon/lat and the projected X-Y in those
fields. <br>
</p>
<p>Regards,</p>
<p>Micha <br>
</p>
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type="cite">
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<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Date: Thu, 09 Feb 2012 17:21:15 +0100<o:p></o:p></p>
<p class="MsoPlainText">From: Andreas Neumann <<a
moz-do-not-send="true" href="mailto:a.neumann@carto.net">a.neumann@carto.net</a>><o:p></o:p></p>
<p class="MsoPlainText">Subject: Re: [Qgis-user] postgis / PHP<o:p></o:p></p>
<p class="MsoPlainText">To: <<a moz-do-not-send="true"
href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>><o:p></o:p></p>
<p class="MsoPlainText">Message-ID: <<a
moz-do-not-send="true"
href="mailto:c45ab8cba3c98432ac7ed27f2108961b@carto.net">c45ab8cba3c98432ac7ed27f2108961b@carto.net</a>><o:p></o:p></p>
<p class="MsoPlainText">Content-Type: text/plain; charset=UTF-8;
format=flowed<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> Hi,<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> You can use the Postgis commands
"ST_AsText()" and "ST_GeomFromText()" <o:p></o:p></p>
<p class="MsoPlainText"> for this purpose. If you want to
extract x/y you can use<o:p></o:p></p>
<p class="MsoPlainText"> ST_AsText(ST_X(the_geom)) AS x.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> Hope this helps? It is really easy -
not complicated at all.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"> Andreas<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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</blockquote>
<p><br>
</p>
<br>
<pre class="moz-signature" cols="72">--
Micha Silver
GIS Consultant, Arava Development Co.
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il">http://www.surfaces.co.il</a></pre>
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