Dear R Sig Geo People:
Here is probably a dumb question, so please forgive me in advance (or swear,
whatever is most appropriate): could someone recommend a good reference on IDW
that has a numeric example, please?
I like to work things out on a small scale to see how they work.
thanks,
Erin
On 10/16/11, Hodgess, Erin, wrote:
> Dear R Sig Geo People:
>
> Here is probably a dumb question, so please forgive me in advance (or
> swear, whatever is most appropriate): could someone recommend a good
> reference on IDW that has a numeric example, please?
Sure, check out Paul Bolstad's GIS F
Believe it or not, the Wikipedia entry has the formula listed. You can
easily try it out yourself. It's such a simple procedure that it can
be done by hand.
http://en.wikipedia.org/wiki/Inverse_distance_weighting
Pete
On 10/16/11, Hodgess, Erin wrote:
> Dear R Sig Geo People:
>
> Here is prob
Hi Erin,
did you check the book from Roger Bivand -Edzer Pebesma and Gomez-Rubìo:
Applied spatial data analysis with R?
There is some short explanation of how the algorithm work and just one record
of code.
If you want I think I can send you some line of codes as examples.
Giuseppe
_
You are right -- google pointed me to the example:
http://www.asdar-book.org/book/vis_mod.R
chunk 31, where the function "krige", without variogram model, results
in idw. To avoid confusing scripts that suggest kriging takes place,
package gstat also provides a function idw, which does the sam
