[GRASS-user] Interpolating rainfall data across area from points

Rich Shepard rshepard at appl-ecosys.com
Mon Sep 24 12:25:03 PDT 2018

On Mon, 24 Sep 2018, Micha Silver wrote:

> The guidelines that I follow include:

>  *  Rainfall interpolation (of any kind) should be done only for long time
>     periods = at least a full season. since you are looking at 13 years of
>     data then this requirement is fulfilled.

>  * The rules of thumb for "how many points" for kriging interpolation
>    usually says > 30. So again you are fine.

>  *  The GRASS modules offer only ordinary kriging AFAIK, which might be
>     appropriate in this case. But if you want to use Kriging with External
>     Drift with the elevation as the secondary "trend" variable, I think
>     you'll need to go with with R. Having said that, I think that "the
>     jury is still out" on whether elevation improves the interpolation or
>     not. 

   Thanks for the insights. I think that OK would be adequate for now because
the climate is changing and this is a long-term project that will be
monitored and and adjusted as necessary,



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