JarCastingturf-planepoint
turf planepoint module
turf.planepoint(interpolatedPoint, triangle)
Takes a triangular plane as a Polygon and a Point within that triangle and returns the z-value at that point. The Polygon needs to have properties a, b, and c that define the values at its three corners.
Parameters
| parameter | type | description |
|---|---|---|
interpolatedPoint |
Feature.<Point> | the Point for which a z-value will be calculated |
triangle |
Feature.<Polygon> | a Polygon feature with three vertices |
Example
var point = {
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [-75.3221, 39.529]
}
};
var point = turf.point([-75.3221, 39.529]);
// triangle is a polygon with "a", "b",
// and "c" values representing
// the values of the coordinates in order.
var triangle = {
"type": "Feature",
"properties": {
"a": 11,
"b": 122,
"c": 44
},
"geometry": {
"type": "Polygon",
"coordinates": [[
[-75.1221, 39.57],
[-75.58, 39.18],
[-75.97, 39.86],
[-75.1221, 39.57]
]]
}
};
var features = {
"type": "FeatureCollection",
"features": [triangle, point]
};
var zValue = turf.planepoint(point, triangle);
//=features
//=zValue
Returns Number, the z-value for interpolatedPoint
Installation
Requires nodejs.
$ npm install turf-planepoint
Tests
$ npm test
