On Jun 8, 2008, at 5:14 PM, Bob Pawley wrote:
I 'm playing with a variation of the st_translate function we were
discussing last week.
I have created two boxes (spatial_ref) and I wish to place an entity
(graphics.process_dgm) into the temp_ table with the coordinates
that centers the entity in a specific one of these boxes.
Here's the code that I have come up with but so far it produces 0
rows.
Insert into temp_ (the_geom)
Select st_translate(st_translate (graphics.process_dgm.the_geom,
st_y (st_centroid(graphics.process_dgm.the_geom)) - st_x
(st_centroid (spatial_ref.the_geom)),
The first function here should be "st_x", not "st_y".
st_y (st_centroid(graphics.process_dgm.the_geom)) - st_y
(st_centroid (spatial_ref.the_geom))),
( st_xmax(graphics.process_dgm.the_geom) -
st_xmin(graphics.process_dgm.the_geom)),
( st_ymax(graphics.process_dgm.the_geom) -
st_ymin(graphics.process_dgm.the_geom)))
I don't see anything wrong with this, but you should be able to make a
single st_translate call here since max - min won't change in a
translation, e.g.
(st_y (st_centroid(graphics.process_dgm.the_geom)) - st_x (st_centroid
(spatial_ref.the_geom))) + ( st_xmax(graphics.process_dgm.the_geom) -
st_xmin(graphics.process_dgm.the_geom))
So after matching the centroids you're trying to move the lower left
corner of the bounding box to its upper right corner?
from graphics.process_dgm, spatial_ref, temp_
I don't think you need the ", temp_", but it probably doesn't hurt.
where graphics.process_dgm.description = 'Tank'
and spatial_ref.position_ = '2';
Is spatial_ref.position_ text? If it's an integer, drop the quotes.
-- Andy
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