[postgis-users] Basic postgis raster questions

[Pierre Racine]

I totally agree but a wrapper would be convenient for people not familiar with intersection operations on raster. Most are familiar with vector/vector intersections on but not with raster/raster ones. So let's inverse 4) and 5) in my previous mail.

I think the only real major missing pieces are:

1) ST_AsRaster(geometry)

2) ST_Resample(raster)

3) ST_MapAlgebra(raster, raster)

And then the things we can not do with them.

Pierre

> -----Original Message-----
> From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-
> bounces at postgis.refractions.net] On Behalf Of Bryce L Nordgren
> Sent: Wednesday, June 15, 2011 3:38 PM
> To: PostGIS Users Discussion
> Subject: Re: [postgis-users] Basic postgis raster questions
> 
> 
> 
> postgis-users-bounces at postgis.refractions.net wrote on 06/15/2011 07:02:46
> PM:
> 
> > > 4. ST_Clip(raster, geometry)
> 
> If ST_Intersection(raster, geometry) returns a raster having the original pixel
> values inside the geometry, and nodata outside the geometry, I'm not sure I see
> the need for a separate "clip" function. Semantically and mathematically, "clip"
> is "intersection": area common to both arguments.
> 
> Bryce