Hi Stefan! Well, some wktraster operations returns rasters and some returns vectors. I think that the ones that returns vectors (st_intersection) can be viewed as regular postgis tables if selected in a rt_sql plugin. I've never tested it, though. The idea is that if they return vector then qgis should read it as postgis geometries. I'm on a windows notebook now so it's going to take some time to set a raster/vector wktraster overlay to test it. I'm afraid it might not work because of the data structure of the height on st_intersection not being a coordinate and instead being an array. That's all I remember from the tests I did back then and it could stop the result from being displayed without proper treatment.
2010/11/29 Stefan Keller <sfkel...@gmail.com> > Ok (I'm cross posting to qgis-developer and postgis-users). > > I'm still not sure if I did express myself clearly: > You say, that under Windows, there's no QGIS compiled against GDAL > 1.7/1.8 with PostGIS Raster support? > > What I finally dream of, is using QGIS to display the results of a SQL > query (either as raster or vector) against at least one raster layer. > This query contains raster constructors (like ST_Intersection) and > operations (like ST_Reclass; see > http://trac.osgeo.org/postgis/wiki/WKTRaster). > > Any suggestions? > -S. > > > 2010/11/29 Maurício de Paulo <....@gmail.com>: > > Hi Stefan, > > > > WKTRaster Plugin just repasses the right information to the GDAL driver. > > It's not a new qgis driver. > > I'm planning on implementing the table listing using pyqt this week. I > was a > > little delayed by my master's application. > > > > The idea in the plugin is simply find the QGIS's conections available, > list > > the raster tables inside postgis and pass the right arguments to the gdal > > driver. > > > > At the moment I haven't found any gdal 1.7 windows build with QGIS. GDAL > 1.7 > > introduces wktraster. The driver conects to postgis raster and read it as > a > > binary. It's still VERY unstable and gdal version 1.8 seems to be greatly > > improved. > > So what a windows user need to get the plugin to work is a (still not > found) > > qgis compiled against gdal 1.7. > > You can compile your's from source if needed. > > > > So, as far as qgis to wktraster, with the plugin qgis reads the wktraster > as > > a regular raster. Just for show. If you did some kind of processing and > > populated a new raster table, qgis is going to read that result too. The > > plugin is not intended (at the moment at least) to raster processing > inside > > postgis. It just loads the table to the screen. > > > > In the future, with a more stable wktraster probably someone (or me) is > > going to write a set of wktraster's tools as a plugin, but for the moment > it > > should be run as sql. I advise postgis manager's to the task. > > > > Best regards, > > > > > > 2010/11/29 Stefan Keller <....@gmail.com> > >> > >> Hi, > >> > >> There are new versions around of "PostGIS Raster" > >> (renamed from formerly known "PostGIS WKT Raster"). > >> > >> What's the status of your "WKTRaster Plugin 0.1"? > >> I assume it's rendering the raster values (e.g. from ST_AsBinary) - > >> not the polygons/geomvals (from ST_DumpAsPolygons), right? > >> Is there a chance to get it running on Windows too? > >> Are there other plugins? > >> > >> Yours, S. > -- Mauricio de Paulo Engenheiro Cartografo
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