[postgis-users] Postgis Spatial Interpolation

Paragon Corporation lr at pcorp.us
Mon Mar 2 20:21:33 PST 2009

What data format is your lat/long grid in?


From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Greg
Sent: Monday, March 02, 2009 5:06 PM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] Postgis Spatial Interpolation


I'm fairly new to postgis and spatial databases but have been very pleased
with the results I'm getting from postgis to date.  One of my projects is
using postgis to load weather data from a 0.5 x 0.5 degree lat/long grid.
I'm looking to  interpolate data values that fall between that grid point I
have values for.  A bit of googling has revealed a number of applications
that interface to postgis and can do what I need (eg GRASS), but I don't
need their full functionality or the overhead of interfacing with them.  My
project needs simply to return interpolated values to a web page and I would
rather just have a pl/pgsql procedure that gives me interpolated values for
a given point.  My initial thoughts are to feed the necessary point data
from my database into a custom pl/R function and get R to interpolate the
data for my point.  However, that is going to involve a fair amount of
custom code and for me to learn more about R.  I don't want to reinvent the
wheel, so I'd be grateful for any thoughts on solutions that meet my needs?



PS In my googling I also saw references to PGRaster, but it looks like
that's still under consideration for development in postgis? 
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