[postgis-devel] GSoC PostGIS Raster Ideas, Implement a set of geometry to raster functions

[Pierre Racine]

So what interpolation capabilities should we provide?

Something specific for lidar and something else specific for distribution of a species? In other word, only specialized interpolation methods? No generic ones?

Pierre

> -----Original Message-----
> From: postgis-devel-bounces at lists.osgeo.org [mailto:postgis-devel-
> bounces at lists.osgeo.org] On Behalf Of Bborie Park
> Sent: Wednesday, April 17, 2013 11:58 AM
> To: PostGIS Development Discussion
> Subject: Re: [postgis-devel] GSoC PostGIS Raster Ideas, Implement a set of
> geometry to raster functions
> 
> I won't say I am against providing interpolation capabilities.  What I
> will say is that I am absolutely against providing generic
> interpolation capabilities applicable to everything.  The
> interpolation and prior knowledge needed to generate a raster from a
> LIDAR point cloud is very different than that needed to estimate the
> distribution of a species.
> 
> -bborie
> 
> 
> On Wed, Apr 17, 2013 at 7:52 AM, Pierre Racine
> <Pierre.Racine at sbf.ulaval.ca> wrote:
> > Hi Ivan,
> >
> > Basically we need to be able to interpolate from very few points or from
> millions of them. Those points have to be stored as PostGIS GEOMETRY and
> we want to be able to produce only one raster (passing the georeference
> metadata similar to what we pass to ST_AsRaster) or a tiled raster coverage
> based on an already one.
> >
> > Could you speak more about the approach you would use to interpolate
> millions of points into a tiled raster coverage based on another one, which
> would be, for me, the most difficult case?
> >
> > Are you aware and do you understand Martin Isenberg approach for
> "Generating Raster DEM from Mass Points via TIN Streaming"
> (http://www.cs.unc.edu/~isenburg/)?
> >
> > Bborie also has a strong opinion about (against) interpolation. Maybe we
> would like to hear about its point of view?
> >
> > Pierre
> >
> >> -----Original Message-----
> >> From: postgis-devel-bounces at lists.osgeo.org [mailto:postgis-devel-
> >> bounces at lists.osgeo.org] On Behalf Of Ivan Alargic
> >> Sent: Wednesday, April 17, 2013 10:12 AM
> >> To: postgis-devel at lists.osgeo.org
> >> Subject: [postgis-devel] GSoC PostGIS Raster Ideas, Implement a set of
> >> geometry to raster functions
> >>
> >> Hi all,
> >>
> >> Can someone tell me if the idea about implementation of geometry to
> >> raster functions is still available for GSoC 2013?
> >>
> >> I am particularly interested in the implementation of ST_Interpolate
> >> function but I would be also ready to implement other geometry to
> raster
> >> functions if it would be required.
> >>
> >> This topic is interesting to me because it is related to my research about
> >> storing and processing of LiDAR data in PostGIS. Moreover, I posses
> >> experience with Triangle library, which I used to generate terrain models
> >> from LiDAR data and interpolate elevation.
> >>
> >> Regards,
> >>
> >> Ivan Alargic
> >> University of Novi Sad, Serbia
> > _______________________________________________
> > postgis-devel mailing list
> > postgis-devel at lists.osgeo.org
> > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-devel
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at lists.osgeo.org
> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-devel