Re: [postgis-users] Point geom, ST_Value, ST_Intersects and out of range raster coordinates
Solution is to filter out NULL returned when using ST_Value() or DISTINCT or GROUP BY multiple values returned when using ST_Intersect(). Using (only) one solution consistently returns consistent results. Pierre -Message d'origine- De : postgis-users De la part de Peter Devoy Envoyé : 8 janvier 2020 09:29 À : PostGIS Users Discussion Objet : [postgis-users] Point geom, ST_Value, ST_Intersects and out of range raster coordinates [Externe UL*] Hi list I am trying to sample a value in a raster using ST_Value and a point geometry. With the same point geometry I tried to use ST_Intersects to sample from only the relevant row in the raster table but if the point is on the boundary of multiple raster tiles a row is returned for each. However, at the cell level, ST_Value seems to play by different rules and raises "NOTICE: Attempting to get pixel value with out of range raster coordinates..." for all but one of the rows. Resulting in NULL values for all but one row. Please does anyone know if there is there a method or function I can use to get more "consistent" spatial logic without modifying the input point geometry? E.g. either to filter out all rows where the sampled cell would be out of range; or, to have ST_Value return a value for each row found by ST_Intersects. My postgis_version() = "2.5 USE_GEOS=1 USE_PROJ=1 USE_STATS=1". Kind regards Peter ___ postgis-users mailing list postgis-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/postgis-users *ATTENTION : L’émetteur de ce courriel est externe à l’Université Laval. Évitez de cliquer sur un hyperlien, d’ouvrir une pièce jointe ou de transmettre des informations si vous ne connaissez pas l’expéditeur du courriel. En cas de doute, contactez l’équipe de soutien informatique de votre unité ou hameconn...@ulaval.ca. ___ postgis-users mailing list postgis-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/postgis-users
Re: [postgis-users] Point geom, ST_Value, ST_Intersects and out of range raster coordinates
ST_Value has a exclude_no_data value which I think defaults to true. You could try changing it to false to see if the error goes away. You'll probably get garbage back if anything. https://postgis.net/docs/RT_ST_Value.html I thought ST_Intersects had the same feature, but I guess I'm mistaken or it was taken out a while ago as I don't see it documented and don't see a function signature for it either. https://postgis.net/docs/RT_ST_Intersects.html -Original Message- From: postgis-users [mailto:postgis-users-boun...@lists.osgeo.org] On Behalf Of Peter Devoy Sent: Wednesday, January 8, 2020 9:29 AM To: PostGIS Users Discussion Subject: [postgis-users] Point geom, ST_Value, ST_Intersects and out of range raster coordinates Hi list I am trying to sample a value in a raster using ST_Value and a point geometry. With the same point geometry I tried to use ST_Intersects to sample from only the relevant row in the raster table but if the point is on the boundary of multiple raster tiles a row is returned for each. However, at the cell level, ST_Value seems to play by different rules and raises "NOTICE: Attempting to get pixel value with out of range raster coordinates..." for all but one of the rows. Resulting in NULL values for all but one row. Please does anyone know if there is there a method or function I can use to get more "consistent" spatial logic without modifying the input point geometry? E.g. either to filter out all rows where the sampled cell would be out of range; or, to have ST_Value return a value for each row found by ST_Intersects. My postgis_version() = "2.5 USE_GEOS=1 USE_PROJ=1 USE_STATS=1". Kind regards Peter ___ postgis-users mailing list postgis-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/postgis-users ___ postgis-users mailing list postgis-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/postgis-users
[postgis-users] Point geom, ST_Value, ST_Intersects and out of range raster coordinates
Hi list I am trying to sample a value in a raster using ST_Value and a point geometry. With the same point geometry I tried to use ST_Intersects to sample from only the relevant row in the raster table but if the point is on the boundary of multiple raster tiles a row is returned for each. However, at the cell level, ST_Value seems to play by different rules and raises "NOTICE: Attempting to get pixel value with out of range raster coordinates..." for all but one of the rows. Resulting in NULL values for all but one row. Please does anyone know if there is there a method or function I can use to get more "consistent" spatial logic without modifying the input point geometry? E.g. either to filter out all rows where the sampled cell would be out of range; or, to have ST_Value return a value for each row found by ST_Intersects. My postgis_version() = "2.5 USE_GEOS=1 USE_PROJ=1 USE_STATS=1". Kind regards Peter ___ postgis-users mailing list postgis-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/postgis-users
