Her table constraints indicate that the NODATA value is properly set to -9999.
-bborie On Wed, Aug 21, 2013 at 12:51 PM, Tim Keitt <[email protected]> wrote: > Gdal is honoring the no-data value encoded in the raster file, but postgis > is not. I see this problem in a lot of code out there. > > THK > > > On Wed, Aug 21, 2013 at 2:26 PM, Hailey Eckstrand < > [email protected]> wrote: > >> Hello, >> I am trying perform aggregate statistics on a raster vector overlay with >> a polygon of 192 sub polys. Many of the resulting 192 mean values are >> correct.. however, I am encountering that one vector overlay mean is NULL >> which I know to be incorrect. The polygon and raster are in the same >> projection and when I look at them in QGIS they are overlaid correctly and >> I can see that the polygon is over top of ~30 raster cells that are all the >> value 3 (it is not over top of any NA values). One thing that is sort of >> fishy is that QGIS is reading the raster statistics and no data value >> incorrectly (values included below) compared to the base ascii raster >> gdalinfo which is included below. >> >> My query: >> >> select bid,(ST_SummaryStatsAgg(ST_Clip(rast,1, geom, true))).mean >> FROM aet_1,(select * from zben_allwshds where bid = 61) foo >> WHERE ST_Intersects(rast, geom) >> GROUP BY bid >> order by bid; >> NOTICE: The two rasters provided have no intersection. Returning no >> band raster >> CONTEXT: PL/pgSQL function "st_clip" line 39 at assignment >> NOTICE: Could not find raster band of index 1 when setting pixel value. >> Nodata value not set. Returning original raster >> CONTEXT: PL/pgSQL function "st_clip" line 41 at assignment >> NOTICE: Invalid band index (must use 1-based). Returning NULL >> CONTEXT: PL/pgSQL function "raster_summarystatsstate" line 9 at >> assignment >> SQL function "raster_summarystatsstate" statement 1 >> bid | mean >> -----+------ >> 61 | >> >> >> Query which returns all the Summary Stats (order of stats is count | sum >> | mean | stddev | min | max) >> >> select bid,(ST_SummaryStatsAgg(ST_Clip(rast,1, geom, true))) >> FROM aet_1,(select * from zben_allwshds where bid = 61) foo >> WHERE ST_Intersects(rast, geom) >> GROUP BY bid >> order by bid; >> NOTICE: The two rasters provided have no intersection. Returning no >> band raster >> CONTEXT: PL/pgSQL function "st_clip" line 39 at assignment >> NOTICE: Could not find raster band of index 1 when setting pixel value. >> Nodata value not set. Returning original raster >> CONTEXT: PL/pgSQL function "st_clip" line 41 at assignment >> NOTICE: Invalid band index (must use 1-based). Returning NULL >> CONTEXT: PL/pgSQL function "raster_summarystatsstate" line 9 at >> assignment >> SQL function "raster_summarystatsstate" statement 1 >> bid | st_summarystatsagg >> -----+-------------------- >> 61 | (,237,,,3,3) >> >> >> >> The raster was loaded into postgresql with the raster2pgsql tool: >> >> raster2pgsql -s 3005 -I -C -M aet_1.asc -F -t 100x100 public.aet_1 | psql >> -d NWBC >> >> gdalinfo of the loaded raster: >> >> gdalinfo aet_1.asc >> Driver: AAIGrid/Arc/Info ASCII Grid >> Files: aet_1.asc >> aet_1.asc.aux.xml >> Size is 2331, 2895 >> Coordinate System is `' >> Origin = (173461.904000000009546,1929781.912000000011176) >> Pixel Size = (400.000000000000000,-400.000000000000000) >> Corner Coordinates: >> Upper Left ( 173461.904, 1929781.912) >> Lower Left ( 173461.904, 771781.912) >> Upper Right ( 1105861.904, 1929781.912) >> Lower Right ( 1105861.904, 771781.912) >> Center ( 639661.904, 1350781.912) >> Band 1 Block=2331x1 Type=Float32, ColorInterp=Undefined >> Min=0.000 Max=9.000 >> Minimum=0.000, Maximum=9.000, Mean=1.955, StdDev=2.375 >> NoData Value=-9999 >> Metadata: >> STATISTICS_MAXIMUM=9 >> STATISTICS_MEAN=1.9546895049572 >> STATISTICS_MINIMUM=0 >> STATISTICS_STDDEV=2.3747620319231 >> >> Incorrect QGIS Raster Statistics: >> >> STATISTICS_MAXIMUM=1.2341209168929e+033 >> >> STATISTICS_MEAN=5.9293249344197e+031 >> >> STATISTICS_MINIMUM=-9999 >> >> STATISTICS_STDDEV=2.4574481861697e+032 >> >> NODATA VALUE= -32768 >> >> PostGIS raster info: >> >> rid serial NOT NULL, >> rast raster, >> filename text, >> CONSTRAINT aet_1_pkey PRIMARY KEY (rid), >> CONSTRAINT enforce_height_rast CHECK (st_height(rast) = 100), >> CONSTRAINT enforce_max_extent_rast CHECK >> (st_coveredby(st_convexhull(rast), >> '0103000020BD0B000001000000050000001D5A643BAF2C0541FCA9F1D2EB7D27411D5A643BAF2C0541FED478E935723D41448B6CE7954B3141FED478E935723D41448B6CE7954B3141FCA9F1D2EB7D27411D5A643BAF2C0541FCA9F1D2EB7D2741'::geometry)), >> CONSTRAINT enforce_nodata_values_rast CHECK >> (_raster_constraint_nodata_values(rast)::numeric(16,10)[] = >> '{-9999}'::numeric(16,10)[]), >> CONSTRAINT enforce_num_bands_rast CHECK (st_numbands(rast) = 1), >> CONSTRAINT enforce_out_db_rast CHECK (_raster_constraint_out_db(rast) = >> '{f}'::boolean[]), >> CONSTRAINT enforce_pixel_types_rast CHECK >> (_raster_constraint_pixel_types(rast) = '{32BF}'::text[]), >> CONSTRAINT enforce_same_alignment_rast CHECK (st_samealignment(rast, >> '0100000000000000000000794000000000000079C01D5A643BAF2C0541FED478E935723D4100000000000000000000000000000000BD0B000001000100'::raster)), >> CONSTRAINT enforce_scalex_rast CHECK (st_scalex(rast)::numeric(16,10) = >> 400::numeric(16,10)), >> CONSTRAINT enforce_scaley_rast CHECK (st_scaley(rast)::numeric(16,10) = >> (-400)::numeric(16,10)), >> CONSTRAINT enforce_srid_rast CHECK (st_srid(rast) = 3005), >> CONSTRAINT enforce_width_rast CHECK (st_width(rast) = 100) >> >> >> >> Install info: >> >> PostgreSQL Version 9.1 >> >> postgis_full_version: >> POSTGIS="2.0.1 r9979" GEOS="3.3.8-CAPI-1.7.8" PROJ="Rel. 4.8.0, 6 March >> 2012" GDAL="GDAL 1.9.2, released 2012/10/08" LIBXML="2.7.8" TOPOLOGY RASTER >> (1 row) >> >> QGIS version: >> 1.8.0-Lisboa >> Compiled against GDAL/OGR >> 1.9.2 >> Running against GDAL/OGR >> 1.9.2 >> GEOS Version >> 3.3.8 >> PostgreSQL Client Version >> 8.3.10 >> >> >> Sorry for all the extra information, I just don't know what people need >> to know to help. Thanks in advance! >> >> Hailey >> >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> >> > > > -- > http://www.keittlab.org/ > > _______________________________________________ > postgis-users mailing list > [email protected] > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users > >
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