graticule.precision([angle]) If precision is specified, sets the precision for this graticule, in degrees. If precision is not specified, returns the current precision, which defaults to 2.5°.

d3.randomLogNormal([mu][, sigma]) Returns a function for generating random numbers with a log-normal distribution. The expected value of the random variable’s natural logrithm is mu, with the given standard deviation sigma. If mu is not specified, it defaults to 0; if sigma is not specified, it defaults to 1.

ordinal.unknown([value]) If value is specified, sets the output value of the scale for unknown input values and returns this scale. If value is not specified, returns the current unknown value, which defaults to implicit. The implicit value enables implicit domain construction; see ordinal.domain.

voronoi.y([y]) If y is specified, sets the y-coordinate accessor. If y is not specified, returns the current y-coordinate accessor, which defaults to: function y(d) { return d[1]; }

d3.stackOrderAscending(series) Returns a series order such that the smallest series (according to the sum of values) is at the bottom.

d3.geoRobinson() d3.geoRobinsonRaw The Robinson projection.

graticule.lines() Returns an array of GeoJSON LineString geometry objects, one for each meridian or parallel for this graticule.

d3.polygonContains(polygon, point) <> Returns true if and only if the specified point is inside the specified polygon.

d3.interpolatePuBuGn(t) d3.schemePuBuGn Given a number t in the range [0,1], returns the corresponding color from the “PuBuGn” sequential color scheme represented as an RGB string.

d3.geoLittrow() d3.geoLittrowRaw The Littrow projection is the only conformal retroazimuthal map projection. Typically clipped to the geographic extent [[-90°, -60°], [90°, 60°]].