Here comes another option to analyze a TimeSpace-Track with R. A lattice cloud plots every recorded trackpoint into a 3d-time-space-cube. As the data (planar point pattern) is marked with the daytime, cluster of everyday routines become visible.
Here the direct comparison between a function of density and the time-space-cloud.
cloud(time_hours ~ PPP_selection$x * PPP_selection$y, data = daten, zlim = c(23,0), xlim = c(653000,643000), screen = list(z = 160, x = 120), panel.aspect = 0.75, xlab = “Longitude”, ylab = “Latitude”, zlab = “Time”, scales = list(z = list(arrows = FALSE, distance = 2), x = list(arrows =FALSE, distance = 2), y = list(arrows = FALSE, distande = 2)),)
This examle is inspired by: http://lmdvr.r-forge.r-project.org/ (Figure 6.2)