[R-sig-Geo] gstat for interpolation

[Mintewab Bezabih]

Dear Ashton,

I am fine with using the Inverse Distance Weighting or the Nearest
Neighbour and I can also use your suggestion of the two coordinate
plotting. The purpose of my exercise is to get interpolated figures
that I will use in further statistical analysis (I am an economist and
my understanding of GIS issues is very limited).

I would be delighted if you could give me more tips on how I could go
about this. I had previously attempted doing interpolation with R
(which is perhaps totally wrong but I can post it here if you think I
can incorporate your suggestions on there

Many thanks.
Regards,
Minti



On Fri, Sep 7, 2012 at 2:45 PM, Ashton Shortridge <ashton at msu.edu> wrote:
> Dear Minti,
>
> with only 8 stations there is not enough data to construct reliable covariance
> (variogram) models. Eight stations simply isn't very many for reliably
> modeling spatial structure. You would be much better off just using inverse
> distance weighting (IDW), which gstat can also do, or even nearest-neighbor
> interpolation.
>
> Second, it would be best to project the latitudes and longitudes to a planar
> coordinate system appropriate for your study region. I think gstat may be able
> to deal with spherical distances, but I haven't any experience with that. The
> rgdal package is one of several that can do this in R; it can also be done in
> GIS or with other geospatial tools.
>
> Yours,
>
> Ashton
>
>
> On 09/07/12, Mintewab Bezabih, wrote:
>> Dear the R-sig-geo users,
>>
>>
>> I have been trying to interpolate rainfall and temperature data for 8
>> stations and that needs to be interpolated at a farm level so that I
>> have farm level temperature and rainfall observations.
>>
>> I am trying to use R for that. First off is kriging in gstat something
>> that I can use for that purpose? I have latitude and longitude
>> information. Can somebody give me some tips on how I can go about
>> that?
>>
>> many thanks in advance
>> minti
>>
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>
> -----
> Ashton Shortridge
> Associate Professor                     ashton at msu.edu
> Dept of Geography                       http://www.msu.edu/~ashton
> 235 Geography Building          ph (517) 432-3561
> Michigan State University               fx (517) 432-1671