More map art, part II

 This follows on the original here, a world map in Natural Earth projection with Mean Annual Climate Temperatures and Natural Earth countries.

Equal Earth vs. Spilhaus projection, masking onshore areas

The original post starts as "a few years ago I used Charlie Frye's online lesson Explore future climate projections to learn how to use NetCDF and map temperature regimes - it's shown below in Patterson & Savaric's Equal Earth Projection..."

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Let's turn fully ocean-centric: Esri's Savaric also reworked the Spilhaus projection here; let's see how Global Mean Annual Temperature enhance the Ocean Basemap shall we? 

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Natural Earth Prisma style greyscale topography with flight paths

1:50m Prisma Shaded Relief , "Artistically-filtered shaded relief of land areas only fitted to the 10 and 50 million-scale Natural Earth coastline, drainages, and spot elevations. A flat gray tint fills water areas," emphasizes onshore topography & flattens the offshore. I took fligt path data from the first image in the second-last post Longest haul flights..., but added the Prisma style onshore topography here. 

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Flight paths are "small circles" or the shortest path on the surface of a globe:

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Adding the Global Annual Mean Temperature diacussed in Part I here really pops up the mid-latitude relief, doesn't it?

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Gray Earth with Shaded Relief, Hypsography, Ocean Bottom, and Drainages

This here is the "generalized shaded relief of land areas only fitted to the 50 million-scale Natural Earth coastline, drainages, and spot elevations... Grayscale shading based on SRTM reference data... Ocean bottom represented by CleanTOPO2 with reduced contrast". In other words both onshore & offshore relief. This was a natural to add the HMS Challenger 1874-77 expedition tracks with depth soundings in fathoms tracking the ocean topgrphy.

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See how the depth soundings match the modern bottom sea topography. The full HMS Challenger project with DIY map guide is posted here (below the now-absent story map, explained in italicised indented paragraph here). Note that the effect on offshore relief of adding Global Mean Annual Temperature isn't as effective below as it was above.

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