feature(Parser): detect if original source have elevation data.

Author: gchoqueux

src/Core/Feature.js

@@ -223,6 +223,8 @@ function push3DValues(value0, value1, value2 = 0) {
  * @property {number[]} normals - All the normals of the Feature.
  * @property {number} size - the number of values of the array that should be associated with a coordinates.
  * The size is 3 with altitude and 2 without altitude.
+ * @property {boolean} hasRawElevationData - indicates if the geographic coordinates, from original source, has an elevation,
+ * the coordinates has a third coordinate.
  * @property {string} crs - Geographic or Geocentric coordinates system.
  * @property {FeatureGeometry[]} geometries - An array containing all {@link
  * FeatureGeometry}.
@@ -246,6 +248,7 @@ class Feature {
         this.crs = collection.crs;
         this.size = collection.size;
         this.normals = collection.crs == 'EPSG:4978' ? [] : undefined;
+        this.hasRawElevationData = false;
 
         this.transformToLocalSystem = collection.transformToLocalSystem.bind(collection);
         if (collection.extent) {

src/Parser/GeoJsonParser.js

@@ -147,6 +147,7 @@ function jsonFeatureToFeature(crsIn, json, collection) {
     const feature = collection.requestFeatureByType(featureType);
     const coordinates = jsonType != 'point' ? json.geometry.coordinates : [json.geometry.coordinates];
     const properties = json.properties || {};
+    feature.hasRawElevationData = coordinates[0]?.length === 3;
 
     // copy other properties
     for (const key of Object.keys(json)) {

src/Parser/VectorTileParser.js

@@ -136,6 +136,7 @@ function readPBF(file, options) {
                     feature.id = layer.id;
                     feature.order = layer.order;
                     feature.style = options.in.styles[feature.id];
+                    feature.hasRawElevationData = false;
                     vtFeatureToFeatureGeometry(vtFeature, feature);
                 } else if (!collection.features.find(f => f.id === layer.id)) {
                     feature = collection.newFeatureByReference(feature);

test/unit/geojson.js

@@ -25,6 +25,16 @@ describe('GeoJsonParser', function () {
             assert.ok(collection.features[0].vertices.every((v, i) => ((i + 1) % 3) != 0 || (v + collection.position.z) != 0));
         }));
 
+    it('should detect if there is the raw elevation data', () =>
+        parse(gpx).then((collection) => {
+            assert.ok(collection.features[0].hasRawElevationData);
+        }));
+
+    it('should detect if there is not the raw elevation data', () =>
+        parse(holes).then((collection) => {
+            assert.ok(!collection.features[0].hasRawElevationData);
+        }));
+
     it('should return an empty collection', () =>
         GeoJsonParser.parse(holes, {
             in: {