John Nelson reports that the Spilhaus projection will be supported in the next version of ArcGIS—version 2.5, to be released in a few months. This odd projection, which centres Antarctica on a world map showing the oceans as a single, uninterrupted body of water; went viral last year. Requests for ArcGIS support soon followed. Thing is, ArcGIS support requires the math behind the projection: figuring out that math took some sleuthing. The Spilhaus is, it turns out, basically an oblique aspect of the Adams World in a Square II projection.
It looks like every map style is doomed to be replicated in ArcGIS Pro. See, for example, Warren Davidson’s Vintage Road Atlas: which renders Toronto and its surrounding area in the style of a 1950s tourist map. It’s double-sided and is designed to be folded (which is to say that there are some upside-down bits). The ArcGIS Pro style—which is called Are We There Yet? and can be downloaded here—even simulates the creases and weathering of an old folded map, though it does so a little too regularly if you look closely. (Also there are some inconsistencies in road lines and highway markers: the map is prisoner of its data.)
But computer mapping may be about to overtake hand-drawn illustration. John M. Nelson has created an ArcGIS style that does the very thing Dan Bell does by hand: emulate the maps of Middle-earth executed by Christopher Tolkien and Pauline Baynes. The style is called, naturally, My Precious: John explains it here and here, and demonstrates the style with this map of the Americas.
There are, of course, some flaws in this method: a mechanical representation of a hand-drawn style risks falling into the uncanny valley’s cartographic equivalent, especially when mountain and forest signs are clone-stamped over large areas. And to be honest I’m not a fan of the Aniron font: those letterforms were used in the Lord of the Rings movies, but never the books’ maps, and now they’re found on damn near every Tolkien-style map, and we hates it, precious, we hates it forever. But Nelson is basically emulating modern fantasy map practice: modern fantasy maps are invariably done in Illustrator, labels are computer generated rather than hand-drawn, and hill signs are clone stamped. Applying it to real-world maps, and GIS software, is new, but a difference in degree.
John Nelson’s map of tornado migration in the United States, showing the seasonal variations in tornado occurrence, is a master class in data visualization and design—in deciding on the right way to present geographic information. The map combines three styles—impressionistic choropleth, weighted mean centre movement diagram, and small multiple—to present month-by-month information all at once; in the accompanying text (also here), Nelson discusses some of the alternatives he could have chosen instead. And in a separate post he talks about how he made the map. [Esri]