Automatically center a projection on the plotted map
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Following this previous post and this discussion on Mastodon, I wrote a function that wraps a combination of functions from the ‘terra’ package to project a SpatRaster or SpatVector layer while automatically centering the projection on that layer, to minimize visual distortion:
Here is a use case (compared with the default behaviour), using e.g. Lambert Azimuthal Equal-Area projection:
This is meant to be used for visualization purposes. For computing e.g. areas or distances, it is better to use unprojected layers, with longitude-latitude coordinates in degrees (making sure that spherical geometry or geodesic algorithms are being used), so that the Earth’s curvature is taken into account.
Note that I just plotted the bare minimum to illustrate what the ‘projectCentered’ function does. Maps can be made to look much nicer — even with just terra + base R plots, with no added package dependencies!
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