clip raster with polygon in postgis

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المشرف العام

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I am newbie in postgis. I have a raster landsat images in table "ras" and a polygon shapefile image in table "shp". Now I want to clip raster with polygon using postgis, but I have a problem


  • The raster and polygon have the same SRID(wgs84), but when using st_intersects(), the result table are all FALSE
Can anybody explain that ??? thanks so much



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