[R] Thiessen Method

[Thomas Adams]

Federico,

I understand what you are after — you want time-series estimates based on the Thiessen polygon estimates
taken from the station time-series data. My recommendation is that the process of doing this would be far
easier using something like GRASS GIS, possibly in conjunction with R (since they play together very well).

Unfortunately, lots of coding/scripting is needed — I can not see that there are a few R commands you can
make to pull this off.

The process would look something like:

(1) import all station data for time step 1 (all data could be imported at one time, but this complicates the process)
(2) make Thiessen polygons based on (1)
(3) write-out results from (2)
(4) repeat (1)-(3) for each time step
(5) concatenate individual Thiessen polygon time-series results sequentially

This kind of thing is pretty straight-forward and keeps computers happy!

Regards,
Tom


> Federico,
>
> That's an improvement, but a long way from the reproducible example
> requested by the posting guide. I and others who might help are more
> interested in the way the data and coordinates are organized and a
> detailed explanation of what you expect the results to look like, etc,
> than in a verbal description of the problem. From your description, I
> can come up with many ways in which your data might be specified, and
> results that you might want.
>
> The posting guide provides valuable tips on how to provide a
> well-formed question.
>
> Did you try looking at the packages and functions I suggested in my
> previous reply?
>
> Sarah
>
> On Thu, May 26, 2011 at 11:35 AM, federico.eccel
> <federico.eccel at gmail.com>  wrote:
>> Dear Sarah,
>>
>> I have a grid in which 8 raingauges are locted, in my case the dataset is
>> composed by 8 hourly timeseries, one for each raingauge. I would like to
>> obtain from these timeseries using the Thiessen method the values of the
>> precipitation in all the grid. In particular I would like to create the
>> thiessen polygons around the raingauges that have to be limited on my grid.
>>
>> Thanks a lot
>>
>> Federico
>>


-- 
Thomas E Adams
National Weather Service
Ohio River Forecast Center
1901 South State Route 134
Wilmington, OH 45177

EMAIL:	thomas.adams at noaa.gov

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