Invert Bertin1953, Chamberlin, interruptedSinuMollweide#181
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… and interruptedSinuMollweide The general Jacobian inversion method is detailed in Ipbuker & Bildirici 2002 In this implementation, I added a dampening factor when the determinant is too small — which helps with convergence near the singularities of the projection. Inspired by Robert B. Schmunk’s work on the Bertin1953 inverse for G.Projector, which showed it was possible. test all inverse projections closes #85 (at long last)
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inverses d3.geoTetrahedralLee See d3/d3-geo-projection#181 for d3-geo-projection
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I've written an explanation of the algorithm here https://observablehq.com/d/8fb764aa82e81880 |
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Added a "backtrack if overshooting" step. |
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… with an approximate 2-d Newton-Raphson method.
The general Jacobian inversion method is detailed in Ipbuker & Bildirici 2002
In this implementation, I added a dampening factor when the determinant is too small — which helps with convergence near the singularities of the projection.
Inspired by Robert B. Schmunk’s work on the Bertin1953 inverse for G.Projector, which showed it was possible.
closes #85 (at long last)