Well, your envelope here is actually a collapsed POLYGON, a LINESTRING, so it would make sense that this particular query would return nothing.

As for the others ... can you post a single small example of what you've hand verified? Maybe we can spot something else going on.

-- Kevin

On 12/6/2010 7:41 PM, Eric Ladner wrote:
     select gid, objectid from gis_schema.jksn_cnty_buidings where
ST_Within(the_geom,ST_AsText(ST_MakeEnvelope(-90, 30, -86, 30,
4269)));
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