[postgis-users] datum shifting in postgis?

[Howard Foster]

Hello all,

Does postgis have a datum shift function?  My transformed data (e.g., 
select transform(the_geom, 26910) from roads;) displays the classic 
offset error of unshifted data (PostGIS version 0.8.2, Postgres v 8., 
NAD27, NAD83).  A naive call of  proj4 (which is how I understand the 
transform function works) won't do datum shifting even though various 
srids have datum parameters.

Any help?

Thanks a bunch,
-Howard (Research Specialist, GISC, UC Berkeley)