[postgis-users] Intepolation

[Pierre Racine]

Normally you would want to interpolate a continuous raster surface from a number of points. Unfortunately we still don't have any interpolation algorithm to do that. One way would be to ST_DelaunayTriangles() your points and then to ST_Union(ST_AsRaster()) them to a raster. But we definitely need more sophisticated interpolation algorithms.

Pierre

> -----Original Message-----
> From: postgis-users-bounces at lists.osgeo.org [mailto:postgis-users-
> bounces at lists.osgeo.org] On Behalf Of Sandro Santilli
> Sent: Thursday, February 14, 2013 5:23 AM
> To: postgis-users at lists.osgeo.org
> Cc: kimanimike2002 at yahoo.com
> Subject: Re: [postgis-users] Intepolation
> 
> Please use the mailing list for further help.
> 
> On Thu, Feb 14, 2013 at 02:12:05AM -0800, kimanimike2002 at yahoo.com
> wrote:
> >> <quote author='Sandro Santilli'>
> >> On Tue, Jan 15, 2013 at 05:29:33AM -0800, Michael Ngugi Kimani wrote:
> >> > Hi all,
> >> > Is is possible to create a query in postgis that does interpolation using
> >> > point data.
> >>
> >> Yes, see the linear referencing section in the reference manual:
> >> http://postgis.net/docs/manual-2.0/reference.html#Linear_Referencing
> >
> > Thanks for your feedback. Isnt it possible for one to get interpolated results
> inform of polygon. Because, I have rain data from various points. I want the
> interpolation of this points to display the area coverage and it seems linear
> referencing is for lines only.
> 
> Maybe filter points based on values and use ST_ConvexHull to build
> a polygon arund them, or consider using the new raster type.
> 
> 
> --strk;
> 
> 
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