page_title: Quartic authalic projection
hierarchical_section_title: Quartic authalic projection
caption_attribution_description: English: The world on the quartic authalic projection. 15° graticule. Imagery is a derivative of NASA’s Blue Marble summer month composite with oceans lightened to enhance legibility and contrast. Image created with the Geocart map projection software.
context_page_description: In cartography, the quartic authalic projection is an equal-area projection developed by Karl Siemon in 1937 and independently by O.S. Adams in 1944. The meridians in this projection are fourth-order polynomial curves. The projection is similar to the sinusoidal projection in appearance and distortion properties.
context_section_description: In cartography, the quartic authalic projection is an equal-area projection developed by Karl Siemon in 1937 and independently by O.S. Adams in 1944. The meridians in this projection are fourth-order polynomial curves. The projection is similar to the sinusoidal projection in appearance and distortion properties.
caption: Quartic authalic projection of the world. 15° graticule.
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