Hi all,
I figured out how to use Intersection and get a resulting table with
apparently correct results using the example from the PostGIS website:
CREATE TABLE new_fields AS
SELECT
Intersection(f.the_geom, c.the_geom) AS the_geom,
f.attr1,
f.attr2,
c.clu_name
FROM
fields f,
clu c
WHERE
f.the_geom && c.the_geom
AND
Intersects(f.the_geom, c.the_geom)
However, this example does not create a gid column and I therefore can
not view the results in a GIS program. Is there a way to create a gid
column after-the-fact?
Optional questions for those feeling super-helpful:
(1) How should the above SQL be rewritten to include gid in the
resulting table?
(2) I know that eliminating the first line will simply give me a table
spit onto the SQL results in pgAdmin. How do I alter the SQL above to
give me the acreages rather then a list of the geometries? I can get the
acreages from the table resulting from the above, but I can't figure out
how to skip the step of creating a table.
(3) What is the syntax using ST_Intersection rather than Intersection?
thanks,
Marcus
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