Thank you Pierre, it works as I would like. I would like to use the pixel values in calculations.
I did not find ST_Clip in the manual. Joan On 28 February 2012 19:16, Pierre Racine <pierre.rac...@sbf.ulaval.ca>wrote: > > I would like to get the pixel value and geometry without having to group > the > > pixels with the same value together as ST_DumpAsPolygons does. > > > > I my goal is to get pixel values whose center is within a polygon. > > SELECT (ST_PixelAsPolygons(ST_Clip(rast, yourpolygon))).val > FROM yourrastertable, yourpolygontable > WHERE ST_Intersects(rast, yourpolygon) > > but normally you want to compute some sort of statistic with all those > values. In this case you use ST_SummaryStats() instead of PixelAsPolygons(). > > Pierre > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users >
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