[postgis-users] transform - update lake set the_geom=transform(the_geom, 26971)

[cyw]

I have a table city which contains Multipolygons (SRID=4326) in latitude and 
longitude. To project it to  a plane coordinate (SRID=26971), I did:

   update lake set the_geom=transform(the_geom, 26971);
It ran without any error. But some of the resulted values in the_geom column 
became null or empty.

Any hitnts why it did this?

Before the transformation, I viewed the table with QuantumGIS, it looked OK. 
Afterwards, QuantumGIS showed nothing.

Thanks,
CYW




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