new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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D3 · all subjects

d3-geo/conic

9 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

d3-geo conic projections

Conic projections available: d3.geoConicConformal, d3.geoConicEqualArea, d3.geoConicEquidistant, d3.geoAlbers, d3.geoAlbersUsa. Conic projection configuration method: conic.parallels (set two standard parallels).

Conic projections definition

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

geoConicConformal() signature and default

geoConicConformal() creates a conic conformal projection. The parallels default to [30°, 30°] resulting in a flat top.

geoConicEqualArea() signature

geoConicEqualArea() creates the Albers' equal-area conic projection.

geoConicEquidistant() signature

geoConicEquidistant() creates the conic equidistant projection.

geoAlbers() signature

geoAlbers() creates the Albers' equal-area conic projection, configured as U.S.-centric. It is a configuration of geoConicEqualArea().

geoAlbersUsa() signature and composition

geoAlbersUsa() creates a U.S.-centric composite projection composed 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 at 0.35× its true relative area.

geoAlbersUsa() unsupported methods

geoAlbersUsa() has fixed clip, center and rotation. This projection does not support projection.center(), projection.rotate(), projection.clipAngle(), or projection.clipExtent().

*conic*.parallels() method

The *conic*.parallels(*parallels*) method sets or gets the two standard parallels that define the map layout in conic projections.

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