spacetime (version 0.2-2)

STSDF-class: Class "STSDF"

Description

A class for spatio-temporal data with partial space-time grids; for n spatial locations and m times, an index table is kept for which nodes observations are available

Usage

STS(sp, time, index)
  STSDF(sp, time, data, index)
  ## S3 method for class 'STSDF':
[(x, i, j, ..., drop = TRUE)
  ## S3 method for class 'STSDF,STFDF':
coerce(from, to, strict=TRUE)
  ## S3 method for class 'STSDF,STIDF':
coerce(from, to, strict=TRUE)

Arguments

sp

object of class Spatial

time

object of class xts

data

data frame with appropriate number of rows

index

n x 2 matrix, see above

x

an object of class STFDF

i

selection of spatial entities

j

selection of temporal entities (see syntax in package xts)

...

selection of attribute(s)

drop

if TRUE and a single spatial entity is selected, an object of class xts is returned; if TRUE and a single temporal entity is selected, and object of the appropriate Spatial class is returned; if FALSE, no coerc

from

object of class STFDF

to

target class

strict

ignored

Objects from the Class

Objects of this class carry full space/time grid data

Examples

sp = cbind(x = c(0,0,1), y = c(0,1,1))
row.names(sp) = paste("point", 1:nrow(sp), sep="")
sp = SpatialPoints(sp)
time = xts(1:4, as.POSIXct("2010-08-05")+3600*(10:13))
m = c(10,20,30) # means for each of the 3 point locations
mydata = rnorm(length(sp)*length(time),mean=rep(m, 4))
IDs = paste("ID",1:length(mydata))
mydata = data.frame(values = signif(mydata,3), ID=IDs)
stfdf = STFDF(sp, time, mydata)
stfdf
stpdf = as(stfdf, "STSDF")
stpdf[1:2,]
stpdf[,1:2]
stpdf[,,2]
stpdf[,,"values"]
stpdf[1,]
stpdf[,2]
# examples for [[, [[<-, $ and $<- 
stpdf[[1]]
stpdf[["values"]]
stpdf[["newVal"]] <- rnorm(12)
stpdf$ID
stpdf$ID = paste("OldIDs", 1:12, sep="")
stpdf$NewID = paste("NewIDs", 12:1, sep="")
stpdf