ConstructMPst: Construct Spatio - temporal regular data.

Description Usage Arguments Details Value References Examples

View source: R/ConstructMPst.R

Description

Create an spatio - temporal object with regular data, in order to employ median polish technique.

Usage

1
ConstructMPst(valuest,time,pts,Delta)

Arguments

valuest

data.frame in which different columns refer to different locations, and each row reflects a particular observation time.

time

indicate the time of valuest, the intervals of time must be regular.

pts

data.frame that hold three dimensions spatial coordinates x, y and z. Therefore, the coordinates should be projected.

Delta

vector with number of divisions of each spatial direction. c(Delta x, Delta y, Delta z).

Details

This function configures an irregular distribution of spatio – temporal data in four - ways. Therefore, the new data corresponds to the average of values and coordinates of every spatio -temporal cell.

Value

An object of class ConstructMPst with the following list of components:

results

average value on the stations set into unity spatio – temporal defined for delta.

Value

array with the results organized by cells, the size of the cells is defined in Delta.

valuest

valuest.

pts

pts.

time

time.

Delta

Delta.

References

Mart<c3><ad>nez, W. A., Melo, C. E., & Melo, O. O. (2017). Median Polish Kriging for space–time analysis of precipitation Spatial Statistics, 19, 1-20. [link]

Berke, O. (2001). Modified median polish kriging and its application to the wolfcamp - aquifer data. Environmetrics, 12(8):731-748.[link]

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
## Not run:
library(zoo)
data(Metadb)
#records of monthly precipitation from january 2007 to january 2010
Metadb<-Metadb[,c(1:4,89:125)]
x<-matrix(0,1,37)
for(i in 1:37){
 x[,i] <- 2007 + (seq(0, 36)/12)[i]
}
x<-as.Date (as.yearmon(x), frac = 1)
time = as.POSIXct(x, tz = "GMT")
MPST<-ConstructMPst(Metadb[,-c(1:4)],time,pts=Metadb[,2:4],Delta=c(7,6,5))
## End(Not run)

STMedianPolish documentation built on May 30, 2017, 1:25 a.m.