line Gradient
A gradient used to color a line feature at various distances along its length. Defined using a step
or interpolate
expression which outputs a color for each corresponding line-progress
input value. line-progress
is a percentage of the line feature's total length as measured on the webmercator projected coordinate plane (a number
between 0
and 1
). Can only be used with GeoJSON sources that specify "lineMetrics": true
.