Source: https://d3js.org/d3-geo/conic

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Conic projections ​

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Conic projections project the sphere onto a cone, and then unroll the cone onto the plane. Conic projections have two standard parallels .

conic.parallels(parallels) ​

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Source · The two standard parallels that define the map layout in conic projections.

geoConicConformal() ​

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Source · The conic conformal projection. The parallels default to [30°, 30°] resulting in flat top.

geoConicEqualArea() ​

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Source · The Albers’ equal-area conic projection.

geoConicEquidistant() ​

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Source · The conic equidistant projection.

geoAlbers() ​

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Source · The Albers’ equal area-conic projection. This is a U.S.-centric configuration of geoConicEqualArea .

geoAlbersUsa() ​

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Source · This is a U.S.-centric composite projection of three geoConicEqualArea projections: geoAlbers is used for the lower forty-eight states, and separate conic equal-area projections are used for Alaska and Hawaii. The scale for Alaska is diminished: it is projected at 0.35× its true relative area. See Albers USA with Territories for an extension to all US territories, and d3-composite-projections for more examples.

The constituent projections have fixed clip, center and rotation, and thus this projection does not support projection.center , projection.rotate , projection.clipAngle , or projection.clipExtent .