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<h1 class="page-title">Source: Map/featureDataToGeoJson.js</h1>
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<pre class="prettyprint source linenums"><code>'use strict';
/*global require*/
var computeRingWindingOrder = require('../Map/computeRingWindingOrder');
var defined = require('terriajs-cesium/Source/Core/defined');
var pointInPolygon = require('point-in-polygon');
var Point = require('@mapbox/point-geometry');
var WindingOrder = require('terriajs-cesium/Source/Core/WindingOrder');
/**
* Converts feature data, such as from a WMS GetFeatureInfo or an Esri Identify, to
* GeoJSON. The set of feature data formats supported by this function can be extended
* by adding to {@link featureDataToGeoJson#supportedFormats}.
*
* @param {Object} featureData The feature data to convert to GeoJSON.
* @return {Object} The GeoJSON representation of this feature data, or undefined if it cannot be converted to GeoJSON.
*/
function featureDataToGeoJson(featureData) {
if (!defined(featureData)) {
return undefined;
}
for (var i = 0; i < featureDataToGeoJson.supportedFormats.length; ++i) {
var converted = featureDataToGeoJson.supportedFormats[i].converter(featureData);
if (defined(converted)) {
return converted;
}
}
return undefined;
}
featureDataToGeoJson.supportedFormats = [
{
name: 'GeoJSON',
converter: convertGeoJson
},
{
name: 'Esri',
converter: convertEsri
}
];
function convertGeoJson(featureData) {
if ((featureData.type === 'Feature' && defined(featureData.geometry)) ||
(featureData.type === 'FeatureCollection' && defined(featureData.features))) {
return featureData;
}
}
function convertEsri(featureData) {
return getEsriGeometry(featureData, featureData.geometryType, featureData.geometry && featureData.geometry.spatialReference);
}
// spatialReference is optional.
function getEsriGeometry(featureData, geometryType, spatialReference) {
if (defined(featureData.features)) {
// This is a FeatureCollection.
return {
type: 'FeatureCollection',
crs: esriSpatialReferenceToCrs(featureData.spatialReference),
features: featureData.features.map(function(subFeatureData) {
return getEsriGeometry(subFeatureData, geometryType);
})
};
}
var geoJsonFeature = {
type: 'Feature',
geometry: undefined,
properties: featureData.attributes,
};
if (defined(spatialReference)) {
geoJsonFeature.crs = esriSpatialReferenceToCrs(spatialReference);
}
if (geometryType === 'esriGeometryPolygon') {
// There are a bunch of differences between Esri polygons and GeoJSON polygons.
// For GeoJSON, see https://tools.ietf.org/html/rfc7946#section-3.1.6.
// For Esri, see http://resources.arcgis.com/en/help/arcgis-rest-api/#/Geometry_objects/02r3000000n1000000/
// In particular:
// 1. Esri polygons can actually be multiple polygons by using multiple outer rings. GeoJSON polygons
// can only have one outer ring and we need to use a MultiPolygon to represent multiple outer rings.
// 2. In Esri which rings are outer rings and which are holes is determined by the winding order of the
// rings. In GeoJSON, the first ring is the outer ring and subsequent rings are holes.
// 3. In Esri polygons, clockwise rings are exterior, counter-clockwise are interior. In GeoJSON, the first
// (exterior) ring is expected to be counter-clockwise, though lots of implementations probably don't
// enforce this. The spec says, "For backwards compatibility, parsers SHOULD NOT reject
// Polygons that do not follow the right-hand rule."
// Group rings into outer rings and holes/
const outerRings = [];
const holes = [];
featureData.geometry.rings.forEach(function(ring) {
if (computeRingWindingOrder(ring.map(p => new Point(...p))) === WindingOrder.CLOCKWISE) {
outerRings.push(ring);
} else {
holes.push(ring);
}
// Reverse the coordinate order along the way due to #3 above.
ring.reverse();
});
if (outerRings.length === 0 && holes.length > 0) {
// Well, this is pretty weird. We have holes but not outer ring?
// Most likely scenario is that someone messed up the winding order.
// So let's treat all the holes as outer rings instead.
holes.forEach(hole => { hole.reverse(); });
outerRings.push(...holes);
holes.length = 0;
}
// If there's only one outer ring, we can use a `Polygon` and things are simple.
if (outerRings.length === 1) {
geoJsonFeature.geometry = {
type: 'Polygon',
coordinates: [outerRings[0], ...holes]
};
} else {
// Multiple (or zero!) outer rings, so we need to use a multipolygon, and we need
// to figure out which outer ring contains each hole.
geoJsonFeature.geometry = {
type: 'MultiPolygon',
coordinates: outerRings.map(ring => [ring, ...findHolesInRing(ring, holes)])
};
}
} else if (geometryType === 'esriGeometryPoint') {
geoJsonFeature.geometry = {
type: 'Point',
coordinates: [featureData.geometry.x, featureData.geometry.y]
};
} else if (geometryType === 'esriGeometryPolyline') {
geoJsonFeature.geometry = {
type: 'MultiLineString',
coordinates: featureData.geometry.paths
};
} else {
return undefined;
}
return geoJsonFeature;
}
function findHolesInRing(ring, holes) {
// Return all holes where every vertex in the hole ring is inside the outer ring.
return holes.filter(hole => hole.every(coordinates => pointInPolygon(coordinates, ring)));
}
function esriSpatialReferenceToCrs(spatialReference) {
if (!defined(spatialReference)) {
return undefined;
}
if (spatialReference.wkid === 102100) {
return {
type: 'name',
properties: {
name: 'urn:ogc:def:crs:EPSG::3857'
}
};
} else if (defined(spatialReference.wkid)) {
return {
type: 'name',
properties: {
name: 'urn:ogc:def:crs:EPSG::' + spatialReference.wkid
}
};
}
return undefined;
}
module.exports = featureDataToGeoJson;
</code></pre>
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