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R version 4.4.1 (2024-06-14) -- "Race for Your Life"
Copyright (C) 2024 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> suppressPackageStartupMessages(library(sp))
> suppressPackageStartupMessages(library(spacetime))
> suppressPackageStartupMessages(library(xts))
>
> # example 0: construction with STFDF:
>
> ## IGNORE_RDIFF_BEGIN
> if (require(maps, quietly = TRUE)) {
+ states.m = map('state', plot=FALSE, fill=TRUE)
+ IDs <- sapply(strsplit(states.m$names, ":"), function(x) x[1])
+
+ if (require(sf, quietly = TRUE)) {
+ sta = st_as_sf(states.m)
+ row.names(sta) = unique(IDs)
+ states = geometry(as(sta, "Spatial"))
+
+ if (require(plm, quietly = TRUE)) {
+ data(Produc)
+
+ yrs = 1970:1986
+ time = xts(1:17, as.POSIXct(paste(yrs, "-01-01", sep=""), tz = "GMT"))
+ # deselect District of Columbia, polygon 8, which is not present in Produc:
+ Produc.st = STFDF(states[-8], time, Produc[(order(Produc[,2], Produc[,1])),])
+ #stplot(Produc.st[,,"unemp"], yrs)
+
+ # example 1: st from long table, with states as Spatial object:
+ # use Date format for time:
+ Produc$time = as.Date(paste(yrs, "01", "01", sep = "-"))
+ xy = coordinates(states[-8])
+ Produc$x = xy[,1]
+ Produc$y = xy[,2]
+ #using stConstruct, use polygon centroids for location:
+ x = stConstruct(Produc, c("x", "y"), "time")
+ class(x)
+ stplot(x[,,"unemp"])
+
+ # alternatively, pass states:
+ Produc$state = gsub("TENNESSE", "TENNESSEE", Produc$state)
+ Produc$State = gsub("_", " ", tolower(Produc$state))
+ x = stConstruct(Produc, "State", "time", states[-8])
+ class(x)
+ #stplot(x[,,"unemp"], yrs)
+
+ if (require(sf, quietly = TRUE)) {
+ # stConstruct multivariable, time-wide
+ fname = system.file("shape/nc.shp", package="sf")[1]
+ nc = as(read_sf(fname), "Spatial")
+ timesList = list(
+ BIR=c("BIR74", "BIR79"),
+ NWBIR=c("NWBIR74", "NWBIR79"),
+ SID=c("SID74", "SID79")
+ )
+ t = xts(1:2, as.Date(c("1974-01-01","1979-01-01")))
+ nc.st = stConstruct(as(nc, "data.frame"), geometry(nc), timesList,
+ TimeObj = t)
+ }
+ }}}
Linking to GEOS 3.12.1, GDAL 3.8.4, PROJ 9.4.0; sf_use_s2() is TRUE
> ## IGNORE_RDIFF_END
>
> proc.time()
user system elapsed
1.293 1.418 1.218
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