[postgis-users] Broken Casting In Spatial Query

[adam at spatialsystems.org]

Found the issue.  There were "space" only entries in the column being
casted... not related to PostGIS.

>-------- Original Message --------
>Subject: [postgis-users] Broken Casting In Spatial Query
>Date: Sat, December 27, 2008 9:23 am
>To: postgis-users at postgis.refractions.net
>
>I have a spatial query where casting is working and one that doesn't. 
>In the first example "ec" is being cast to double precision from
>varchar. In the second example I'm trying to do the same thing but I
>get this error: ERROR: invalid input syntax for type double precision: "
>" SQL state: 22P02 
>
>What could the problem be?
>
>Works here:
>SELECT
>max(ec::double precision) as max_ec,
>FROM
>best_ec
>WHERE
>location
>&& SetSRID( 'BOX3D( $long_min $lat_min, $long_max $lat_max )'::box3d,
>4326) AND
>distance_spheroid(
>location,
>SetSRID( MakePoint( $long, $lat ), 4326 ),
>'SPHEROID[\"WGS_1984\",6378137,298.257223563]'
>) < 300 ");
>
>
>Doesn't work here:
>SELECT
>X(drive_test_data.grid) AS x,
>Y(drive_test_data.grid) AS y,
>max(drive_test_data.rssi::double precision) AS max_rssi,
>count(drive_test_data.rssi) AS rssi_count
>FROM
>(
>SELECT
>SnapToGrid(best_ec.location, 0.0002) AS grid,
>best_ec.ec as rssi
>FROM
>best_ec
>) AS drive_test_data
>GROUP BY
>x,
>y;






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