My Projection Collection:
Compare Projections
Cahill Conformal Butterfly vs. Cahill Conformal M-shaped Projection
| Cahill Conformal Butterfly | Cahill Conformal M-shaped Projection | |
|---|---|---|
| Creator | Bernard J. S. Cahill, Oscar S. Adams (1929 approx.) | Bernard J. S. Cahill, Oscar S. Adams (1929 approx.) |
| Group | Polyhedral | Polyhedral |
| Property | Conformal | Conformal |
| Other Names | — | — |
| Remarks | In 1909, Cahill developed his first (compromise) butterfly map. He succeeded in having Oscar S. Adams develop the mathematics for a conformal version, which he published in 1929. In Cahill’s original arrangement, Africa was placed in the upper left lobe, the map shown here was centered on 20° West. See Four conformal polyhedric projections and more. |
In 1909, Cahill developed his first (compromise) butterfly map. He succeeded in having Oscar S. Adams develop the mathematics for a conformal version, which he published in 1929. In Cahill’s original arrangement, Africa was placed in the leftmost lobe, the map shown here was centered on 20° West. As far as I know, there’s no established name for the M-shaped variant shown here. The label Cahill Conformal M-shaped Projection was chosen by me for the use on this website. See Four conformal polyhedric projections and more. |
| recommended comparisons | Cahill Conformal, M-shaped Waterman Butterfly |
Cahill Conformal Butterfly |
|
This pairing is among the list of recommended pairings – but why? The M-shaped variant is obtained by a simple re-arrangement of the butterfly map. |
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1. Comparison: Physical Map – scaled to fit
Cahill Conformal Butterfly
Cahill Conformal M-shaped Projection
2. Comparison: Silhouette Map – scaled to fit
Cahill Conformal Butterfly Silhouette Map c Tobias Jung
Cahill Conformal M-shaped Projection Silhouette Map c Tobias Jung
3. Comparison: Tissot Indicatrix, 30° – scaled to fit
Cahill Conformal Butterfly
Cahill Conformal M-shaped Projection
Cahill Conformal Butterfly Tissot Indicatrix c Tobias Jung
Cahill Conformal M-shaped Projection Tissot Indicatrix c Tobias Jung
4. Comparison: Physical Map – scaled to same width
Cahill Conformal Butterfly
Cahill Conformal M-shaped Projection
5. Comparison: Silhouette Map – scaled to same width
Cahill Conformal Butterfly Silhouette Map c Tobias Jung
Cahill Conformal M-shaped Projection Silhouette Map c Tobias Jung
6. Comparison: Tissot Indicatrix, 30° – scaled to same width
Cahill Conformal Butterfly
Cahill Conformal M-shaped Projection
Cahill Conformal Butterfly Tissot Indicatrix c Tobias Jung
Cahill Conformal M-shaped Projection Tissot Indicatrix c Tobias Jung
7. Comparison: Tissot Indicatrix, 15° – scaled to fit
Cahill Conformal Butterfly
Cahill Conformal M-shaped Projection
Cahill Conformal Butterfly Tissot Indicatrix c Tobias Jung
Cahill Conformal M-shaped Projection Tissot Indicatrix c Tobias Jung
8. Comparison: Tissot Indicatrix, 15° – scaled to same width
Cahill Conformal Butterfly
Cahill Conformal M-shaped Projection
Cahill Conformal Butterfly Tissot Indicatrix c Tobias Jung
Cahill Conformal M-shaped Projection Tissot Indicatrix c Tobias Jung