[postgis-users] ST_AsRaster and pixeltype

[Pierre Racine]

Or to remove support for 1BB and 8BSI?

> -----Original Message-----
> From: postgis-users-bounces at lists.osgeo.org [mailto:postgis-users-
> bounces at lists.osgeo.org] On Behalf Of Bborie Park
> Sent: Monday, November 19, 2012 11:30 AM
> To: PostGIS Users Discussion
> Subject: Re: [postgis-users] ST_AsRaster and pixeltype
> 
> This would be a limitation on the datatypes supported by GDAL vs
> PostGIS Raster.  GDAL does not have any data types smaller than 8BUI,
> so any datatype smaller is treated as 8BUI.  8BSI also does not have
> an equivalent in GDAL so is treated as 16BSI.
> 
> Feel free to file a ticket.  The only way to correct this is to add
> another pass converting the output raster's pixel type from GDAL to
> PostGIS Raster.
> 
> -bborie
> 
> On Mon, Nov 19, 2012 at 2:03 AM,  <Michael.Scholz at dlr.de> wrote:
> > Moin!
> > ST_AsRaster does not always create a raster with the specified pixel type.
> Instead of a band with 1BB I get one with 8BUI, which is the default according to
> the documentation. Example:
> > ---------------------
> > CREATE TEMP TABLE foo (rid serial PRIMARY KEY, rast raster);
> >
> > INSERT INTO foo (rast)
> > SELECT ST_AsRaster (ST_MakePolygon (ST_GeomFromText
> ('LINESTRING(604770 5793000, 604870 5793000, 604870 5792900, 604770
> 5793000)',32632)), 0.1, -0.1, '1BB', 1.0, 0.0);
> >
> > SELECT AddRasterConstraints ('foo'::name,'rast'::name);
> >
> > SELECT srid,scale_x,scale_y,num_bands,pixel_types,nodata_values
> > FROM raster_columns
> > WHERE r_table_name = 'foo';
> > ---------------------
> > The result:
> > 32632 | 0.10 | -0.1 | 1 | {8BUI} | {0}
> > If I specify 16BUI, I indeed get a 16BUI-band. Is this a special feature of
> ST_AsRaster or some limitation of GDAL?
> >
> > My version:
> > "POSTGIS="2.0.1 r9979" GEOS="3.3.5-CAPI-1.7.5" PROJ="Rel. 4.8.0, 6 March
> 2012" GDAL="GDAL 1.9.2, released 2012/10/08 GDAL_DATA not found"
> LIBXML="2.7.8" RASTER"
> >
> > Ciaoi, Michi
> > _______________________________________________
> > postgis-users mailing list
> > postgis-users at lists.osgeo.org
> > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
> 
> 
> 
> --
> Bborie Park
> Programmer
> Center for Vectorborne Diseases
> UC Davis
> 530-752-8380
> bkpark at ucdavis.edu
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