# Spatiotemporal Visualization

{mlr3spatiotempcv} makes use of {plotly} to create the 3D plots for visualizing spatiotemporal folds created via the CLUTO algorithm. Arranging multiple 3D plots in {plotly} is done via 3D subplots.

Unfortunately, {plotly}’s subplot implementation is not dynamic. This means that multiple “scene” objects need to be specified in `plotly::layout()` to determine the coordinates of the respective subplot. Depending on the number of chosen folds by the user in `autoplot()`, a different number of scenes with different coordinates needs to be given to align the plots properly.

Hence, manual action is needed to create a properly aligned grid of 3D plots.

Below is an example how to create a 2x2 grid showing four folds as 3D subplots. It makes use of the returned 3D plotly objects which are returned in a list by `autoplot()`:

    library(mlr3)
    library(mlr3spatiotempcv)
    task_st = tsk("cookfarm")
    resampling = rsmp("sptcv_cluto", folds = 5, time_var = "Date")
    resampling$instantiate(task_st)

    pl = plot(resampling, task_st, c(1, 2, 3, 4),
      point_size = 3, axis_label_fontsize = 10)

    # Warnings can be ignored
    pl_subplot = plotly::subplot(pl)

    plotly::layout(pl_subplot,
      title = "Individual Folds",
      scene = list(
        domain = list(x = c(0, 0.5), y = c(0.5, 1)),
        aspectmode = "cube",
        camera = list(eye = list(z = 2.5))
      ),
      scene2 = list(
        domain = list(x = c(0.5, 1), y = c(0.5, 1)),
        aspectmode = "cube",
        camera = list(eye = list(z = 2.5))
      ),
      scene3 = list(
        domain = list(x = c(0, 0.5), y = c(0, 0.5)),
        aspectmode = "cube",
        camera = list(eye = list(z = 2.5))
      ),
      scene4 = list(
        domain = list(x = c(0.5, 1), y = c(0, 0.5)),
        aspectmode = "cube",
        camera = list(eye = list(z = 2.5))
      )
    )

(The Cluto method does not work on macOS: please visit https://mlr3spatiotempcv.mlr-org.com to see the rendered plot.)

Subplot titles can unfortunately not created dynamically. However, there is also a manual workaround via annotations show in this RPubs post.