[R-sig-Geo] space-time kriging

[Tom Gottfried]

You could try

index <- cbind(as.integer(as.factor(prec_data$Station)), as.integer(as.factor(prec_data$Year)))

Tom


Am 01.07.2011 14:02, schrieb Pınar Aslantas Bostan:
> Hi Edzer,
>
> Thank you for your mail.
> Prec data has location and time information.
>
>> prec_data[1:10,]
>     Station      X       Y   Prec Year Month Day
> 1    17020 693894 4931348 1274.4 1970     1   1
> 2    17020 693894 4931348 1134.3 1971     1   1
> 3    17020 693894 4931348  940.7 1972     1   1
> 4    17020 693894 4931348 1253.3 1973     1   1
> 5    17020 693894 4931348  940.8 1974     1   1
> 6    17020 693894 4931348  913.4 1975     1   1
> 7    17020 693894 4931348  895.3 1976     1   1
> 8    17020 693894 4931348  803.5 1977     1   1
> 9    17020 693894 4931348  993.1 1978     1   1
> 10   17020 693894 4931348  976.4 1979     1   1
>
>
> -----Original Message-----
> From: r-sig-geo-bounces at r-project.org [mailto:r-sig-geo-bounces at r-project.org] On Behalf Of Edzer Pebesma
> Sent: Friday, July 01, 2011 2:50 PM
> To: r-sig-geo at r-project.org
> Subject: Re: [R-sig-Geo] space-time kriging
>
> Hi Pinar,
>
> as you say, some data are missing, but the way you create index suggests
> none are missing. Does your table "prec" have information for each
> observation on which location and at which time it has been taken? Could
> you maybe show how prec[1:10,] looks like?
>
> Wbr,
>
> On 07/01/2011 01:12 PM, Pınar Aslantas Bostan wrote:
>> Dear all,
>>
>>
>>
>> I am working about space-time (ST) kriging. I want to make ST ordinary
>> kriging with sparse data set. Dependent data is annual precipitation
>> measured from 257 meteorological station. Observation period starts from
>> 1970 and finishes at 2008, so temporal entity of my study contains 39
>> year-value. Precipitation data comprised from 5365 value. It is not equal to
>> 257 (location) *39 (time), because some stations has no value for some
>> years. Therefore my data set fits to STSDF. An index table is required for
>> STSDF object. But I could not create correct index object, my code does not
>> work.
>>
>>
>>
>> I tried to summarize my code:
>>
>>
>>
>> # creating STSDF object
>>
>>
>>
>> # sp is spatial entity (257 spatial location)
>>
>> # time is temporal entity (39 year period)
>>
>> # prec is data attribute (5365 number of annual precipitation value)
>>
>>
>>
>> index<- as.matrix(expand.grid(1:length(sp),1:nrow(time)))
>>
>> w= STSDF(sp, time, data.frame(values = as.vector(t(prec))),index)
>>
>>
>>
>> Error: nrow(object at index) == nrow(object at data) is not TRUE
>>
>>
>>
>> Can you please help me about this error, how can I create correct index
>> object?
>>
>>
>>
>> Thank you all in advance!
>>
>> With my best regards,
>>
>> Pinar
>>
>>
>>
>>
>>
>> Pinar Aslantas Bostan
>>
>> Research Assistant
>>
>> Department of Geodetic and
>>
>> Geographic Information Technologies (GGIT) Middle East Technical University
>>
>> 06531 Ankara/TURKEY
>>
>> aslantas at metu.edu.tr
>>
>>
>>
>>
>> 	[[alternative HTML version deleted]]
>>
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>

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