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Function: lngLatToMercator()

lngLatToMercator(lng, lat): [number, number]

Defined in: cutline-bbox.ts:114

Project a single WGS84 lng/lat point (degrees) to EPSG:3857 meters.

Throws if the latitude falls outside the Web Mercator projection's valid range (±85.051129°).

This is intended to be used with the CutlineBbox module, which expects a bbox in 3857 meters. The conversion from WGS84 to 3857 is a one-time cost that can be done at bbox definition time, rather than per frame in the shader.

Parameters​

lng​

number

lat​

number

Returns​

[number, number]

Example​

const [west, south] = lngLatToMercator(-120.75, 39.25);
const [east, north] = lngLatToMercator(-120.5, 39.5);
const bbox = [west, south, east, north];