Greg King wrote:
Hi,
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?
Thanks,
G
PS In my googling I also saw references to PGRaster, but it looks like
that's still under consideration for development in postgis?
Hi Greg,
There a bunch of people here that can probably help. If you had a
working function what would be some sample input and output you would
expect and describe the process of computing it. We can probably work
out the details of the math and code a pl/pgsql function.
-Steve
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