When working with geo-spatial data in R, I usually use the sf package for manipulating spatial data as Simple Features objects and ggplot2 with geom_sf for visualizing these data. One thing that comes up regularly is “zooming in” on a certain region of interest, i.e. displaying a certain map detail. There are several ways to do so. Three common options are:
- selecting only certain areas of interest from the spatial dataset (e.g. only certain countries / continent(s) / etc.)
- cropping the geometries in the spatial dataset using
sf_crop() - restricting the display window via
coord_sf()
I will show the advantages and disadvantages of these options and especially focus on how to zoom in on a certain point of interest at a specific “zoom level”. We will see how to calculate the coordinates of the display window or “bounding box” around this zoom point.
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