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The Werner projection preserves area but treats shapes very unevenly. The entire central meridian is free of distortion, and every parallel keeps its true length, running as an arc of a circle around the North Pole. Angles suffer only through shearing: the farther from the prime meridian and the farther south, the more the grid slants. The North Pole is the notch at the top of the heart, and the South Pole its bottom tip. The area-distortion heatmap shows no differences at all here, because area is preserved at every point, so only the shapes of the ellipses and the angular isocoles tell you how good this map is.
The Tissot indicatrices show this very clearly. At 60°N they are almost circles across the whole row, and even at 150° longitude angles change there by only 13°. On the equator the ellipse at 30° longitude changes angles by 19°, the one at 90° by 53°, and the one at 150° by 80°. At 60°S and 150° longitude the change reaches 108°, and the long axis of the ellipse is nearly ten times its short axis. Every one of these ellipses still has the same area as its circle on the globe.
As a result, Greenland, far north and close to the central meridian, has an almost true shape here, and Poland's angles change by only about 3°. Few world maps show both of them this well. Drag Poland to Australia's position: it keeps its area but leans so far that its angles change by about 90°, much like Australia's own. New Zealand, at the edge of the heart, is distorted even more.
The whole central meridian is free of distortion, and Greenland lies far north, close to it. It keeps its area and almost its true shape, and Poland changes angles by only about 3°. On very few world maps do both look this good.
In the south and far from the prime meridian. On the equator the ellipse at 30° longitude changes angles by 19°, at 90° by 53° and at 150° by 80°. At 60°S and 150° longitude the change reaches 108°, and the long axis is nearly ten times the short one.
Yes, at every point, so the area distortion layer shows no differences at all. Only the shapes of the Tissot ellipses and the angular isocoles tell how good the map is. The North Pole is the notch at the top of the heart and the South Pole its lower tip.
It keeps its area but skews so much that its angles change by about 90°, like those of Australia itself. New Zealand, near the edge of the heart, is distorted even more.
