Hi Bruce,
if you use ST_Dump like this, the resulting data type will be an array
consisting of geometrie and path (internal number of the polygon). In
order to just get the geometries, you would have to use this kind of query:
select (st_dump(shape)).geom as the_geom from weather_poly;
If you're writing this in a new table you will be able to access it with
QGIS.
Regards,
Birgit.
Am 27.10.2011 04:06, schrieb Clay, Bruce:
I have a table of points extracted from a raster file. I perform the
following SQL on the table
CREATE TABLE weather_poly as
SELECT(pixel_val, ST_Transform(ST_Union(ST_Buffer(shape, 0.1)),4326)) FROM
weather_points GROUP BY pixel_val;
The resulting polygon is 13 multi-polygons one for each pixel value
instead of one polygon for every cluster of points.
I can run the following SQL select ST_Dump(shape) from weather_poly a
to break the polygons so they appear as separate polygons in
Postgresql data view.
When I try to view them in QGis the table does not show on the list of
available PostGis layers. The properties of the table in Postgresql
show the geometry to be ST_Dump not polygon.
Is there a way to split the multi-polygon into individual polygons or
to build the original polygons separatly so they will show in QGis and
be accessable as such by GDAL based applications?
Bruce
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