TurfMeasurement { public static Polygon envelope(GeoJson geoJson) { return (Polygon) bboxPolygon(bbox(geoJson)).geometry(); } private  TurfMeasurement(); static double bearing(@NonNull Point point1, @NonNull Point point2); @NonNull static Point destination(@NonNull Point point, @FloatRange(from = 0) double distance,
                                  @FloatRange(from = -180, to = 180) double bearing,
                                  @NonNull @TurfConstants.TurfUnitCriteria String units); static double distance(@NonNull Point point1, @NonNull Point point2); static double distance(@NonNull Point point1, @NonNull Point point2,
                                @NonNull @TurfConstants.TurfUnitCriteria String units); static double length(@NonNull LineString lineString,
                              @NonNull @TurfConstants.TurfUnitCriteria String units); static double length(@NonNull MultiLineString multiLineString,
                              @NonNull @TurfConstants.TurfUnitCriteria String units); static double length(@NonNull Polygon polygon,
                              @NonNull @TurfConstants.TurfUnitCriteria String units); static double length(@NonNull MultiPolygon multiPolygon,
                              @NonNull @TurfConstants.TurfUnitCriteria String units); static double length(List<Point> coords, String units); static Point midpoint(@NonNull Point from, @NonNull Point to); static Point along(@NonNull LineString line, @FloatRange(from = 0) double distance,
                            @NonNull @TurfConstants.TurfUnitCriteria String units); static Point along(@NonNull List<Point> coords, @FloatRange(from = 0) double distance,
                            @NonNull @TurfConstants.TurfUnitCriteria String units); static double[] bbox(@NonNull Point point); static double[] bbox(@NonNull LineString lineString); static double[] bbox(@NonNull MultiPoint multiPoint); static double[] bbox(@NonNull Polygon polygon); static double[] bbox(@NonNull MultiLineString multiLineString); static double[] bbox(MultiPolygon multiPolygon); static double[] bbox(GeoJson geoJson); static double[] bbox(FeatureCollection featureCollection); static double[] bbox(Feature feature); static double[] bbox(Geometry geometry); static Feature bboxPolygon(@NonNull BoundingBox boundingBox); static Feature bboxPolygon(@NonNull BoundingBox boundingBox,
                                    @Nullable JsonObject properties,
                                    @Nullable String id); static Feature bboxPolygon(@NonNull double[] bbox); static Feature bboxPolygon(@NonNull double[] bbox,
                                    @Nullable JsonObject properties,
                                    @Nullable String id); static Polygon envelope(GeoJson geoJson); static BoundingBox square(@NonNull BoundingBox boundingBox); static double area(@NonNull Feature feature); static double area(@NonNull FeatureCollection featureCollection); static double area(@NonNull Geometry geometry); static Feature center(Feature feature,
                               @Nullable JsonObject properties,
                               @Nullable String id); static Feature center(Feature feature); static Feature center(FeatureCollection featureCollection,
                               @Nullable JsonObject properties,
                               @Nullable String id); static Feature center(FeatureCollection featureCollection); static double EARTH_RADIUS; }
@Test public void envelope() throws IOException { FeatureCollection featureCollection = FeatureCollection.fromJson(loadJsonFixture(TURF_ENVELOPE_FEATURE_COLLECTION)); Polygon polygon = TurfMeasurement.envelope(featureCollection); final List<Point> expectedPoints = new ArrayList<>(); expectedPoints.add(Point.fromLngLat(20, -10)); expectedPoints.add(Point.fromLngLat(130, -10)); expectedPoints.add(Point.fromLngLat(130, 4)); expectedPoints.add(Point.fromLngLat(20, 4)); expectedPoints.add(Point.fromLngLat(20, -10)); List<List<Point>> polygonPoints = new ArrayList<List<Point>>() {{ add(expectedPoints); }}; Polygon expected = Polygon.fromLngLats(polygonPoints); assertEquals("Polygon should match.", expected, polygon); }