Clipping and geometric operations for spherical polygons.

An archive of the D3 3.x API Reference.

The HCG (Hue, Chroma, Grayness) color space derived from the Munsell color system.

Handy data structures for elements keyed by string.

Geographic projections, spherical shapes and spherical trigonometry.

Compute the quadtree tiles to display in a rectangular viewport.