# isolines

Takes a grid FeatureCollection of Point features with z-values and an array of value breaks and generates isolines.
生成等值线。

参数

参数 类型 描述
pointGrid FeatureCollection <Point> input points
breaks Array values of zProperty where to draw isolines
options Object Optional parameters: see below

options选项

属性 类型 默认值 描述
zProperty string elevation the property name in
commonProperties Object {} GeoJSON properties passed to ALL isolines
breaksProperties Array [] GeoJSON properties passed, in order, to the correspondent isoline; the breaks array will define the order in which the isolines are created

返回

FeatureCollection <MultiLineString> - a FeatureCollection of MultiLineString features representing isolines

示例

// create a grid of points with random z-values in their properties
var extent = [0, 30, 20, 50];
var cellWidth = 100;
var pointGrid = turf.pointGrid(extent, cellWidth, {units: 'miles'});

for (var i = 0; i < pointGrid.features.length; i++) {
    pointGrid.features[i].properties.temperature = Math.random() * 10;
}
var breaks = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

var lines = turf.isolines(pointGrid, breaks, {zProperty: 'temperature'});
Last Updated: 1/19/2021, 10:59:20 AM