[postgis-users] WKT Raster

[Volkmar Herbst privat]

Great, thank you very much!
Volkmar

-----Ursprüngliche Nachricht-----
Von: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] Im Auftrag von Pierre
Racine
Gesendet: Mittwoch, 5. Oktober 2011 17:34
An: PostGIS Users Discussion
Betreff: Re: [postgis-users] WKT Raster

Ticket #1228

http://trac.osgeo.org/postgis/ticket/1228

Pierre

> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-
> bounces at postgis.refractions.net] On Behalf Of Volkmar Herbst privat
> Sent: Sunday, October 02, 2011 4:17 PM
> To: 'PostGIS Users Discussion'
> Subject: Re: [postgis-users] WKT Raster
> 
> That would indeed be a very good function. The same way one can set a
postgis
> geometry from a wkt/ text geometry one could set a raster from an array. I
> think this is absolutely needed. Especially with regard to R/plr but also
for
> creating a raster from other date sources..
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] Im Auftrag von
Pierre
> Racine
> Gesendet: Samstag, 1. Oktober 2011 15:15
> An: PostGIS Users Discussion
> Betreff: Re: [postgis-users] WKT Raster
> 
> We should probably at some point provide a ST_SetValues(raster,
> ARRAY[values]). Would this help?
> 
> Pierre
> 
> > -----Original Message-----
> > From: postgis-users-bounces at postgis.refractions.net
> > [mailto:postgis-users- bounces at postgis.refractions.net] On Behalf Of
> > Volkmar Herbst privat
> > Sent: Tuesday, September 27, 2011 3:54 PM
> > To: postgis-users at postgis.refractions.net
> > Subject: [postgis-users] WKT Raster
> >
> > Hi all,
> > I have a question concerning the creation of a raster in a plr
> > function. I
> create a
> > empty raster and set the pixel values individually with update
> > queries:
> >
> > for(i in 1:nrow(mat_p)) {
> >       for(j in 1:ncol(mat_p)) {
> > pg.spi.exec(sprintf ("UPDATE nutrients.applications SET raster =
> > ST_SetValue(raster,%s, %s, %s,%s) WHERE id = %s ;", 3, j, i,
> > mat_cao[i,j],
> > rid))
> >       }
> > }
> >
> > This takes quite a long time..
> > Does anyone know an alternative approach to create a WKT- Raster in R
> directly
> > without setting each pixel value and export it to a Postgis table?
> > Or is it possible to write the binary raster somehow?
> > Any hints are most welcome,
> >
> > Volkmar
> >
> >
> >
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