isolines

Takes a grid FeatureCollection of Point features with z-values and an array of value breaks and generates isolines.
采用带有z值的点特征的网格FeatureCollection和一组断点值并生成等值线。

参数

参数	类型	描述
pointGrid	FeatureCollection <Point>	input points
breaks	Array	values of zProperty where to draw isolines
options	Object	可选参数：见下文

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'});