diff --git a/lib/src/s2cell_id.dart b/lib/src/s2cell_id.dart
index 88283ef..d68e228 100644
--- a/lib/src/s2cell_id.dart
+++ b/lib/src/s2cell_id.dart
@@ -23,6 +23,7 @@ import 's2coords.dart';
 import 's2coords_impl.dart';
 import 's2point.dart';
 export 's2point.dart';
+import 's1angle.dart';
 import 's2latlng.dart';
 import 'util/bits/bits.dart';
 
@@ -79,6 +80,70 @@ int _lsbForLevel(int level) {
 
 class S2CellId {
   S2CellId(this._id);
+  
+  S2LatLng latLng() {
+    S2Point p = this.rawPoint();
+    return S2LatLng(_latitude(p), _longitude(p));
+  }
+  
+  List<int> faceSiTi() {
+    _maybeInit();
+    List<int> res = faceIJOrientation();
+    int delta = 0;
+    if (this.isLeaf()) {
+      delta = 1;
+    } else if (((res[1] ^ (id >> 2)) & 1) != 0) {
+      delta = 2;
+    }
+    return [res[0], 2 * res[1] + delta, 2 * res[2] + delta];
+  }
+
+
+  List<int> faceIJOrientation() {
+    int face = this.face();
+    int orientation = face & kSwapMask;
+    int nbits = _kMaxLevel - 7 * _kLookupBits;
+
+    int i = 0;
+    int j = 0;
+    for (var k = 7; k >= 0; k--) {
+      orientation += ((id >> (k * 2 * _kLookupBits + 1)) & ((1 << (2 * nbits)) - 1)) << 2;
+      orientation = _lookupIJ[orientation];
+      i += (orientation >> (_kLookupBits + 2)) << (k * _kLookupBits);
+      j += ((orientation >> 2) & ((1 << _kLookupBits) - 1)) << (k * _kLookupBits);
+      orientation &= (kSwapMask | kInvertMask);
+      nbits = _kLookupBits;
+    }
+
+    if (((id & -id) & 0x1111111111111110) != 0) {
+      orientation ^= kSwapMask;
+    }
+
+    return [face, i, j, orientation];
+  }
+  
+  int face() {
+    return this.id >> _kPosBits;
+  }
+
+  bool isLeaf() {
+    return (id & 1) != 0;
+  }
+  
+  S2Point rawPoint() {
+    List<int> res = this.faceSiTi();
+    return faceUVToXYZ(
+      res[0],
+      R2Point(
+        stToUV((0.5 / _kMaxSize) * res[1]),
+        stToUV((0.5 / _kMaxSize) * res[2]),
+      ),
+    );
+  }
+
+  S1Angle _latitude(S2Point p) => S1Angle.fromRadians(atan2(p.z, sqrt(p.x * p.x + p.y * p.y)));
+
+  S1Angle _longitude(S2Point p) => S1Angle.fromRadians(atan2(p.y, p.x));
 
   S2CellId.fromPoint(S2Point p) {
     // ok
diff --git a/test/s2geometry_test.dart b/test/s2geometry_test.dart
index 8afeae5..3209f3d 100644
--- a/test/s2geometry_test.dart
+++ b/test/s2geometry_test.dart
@@ -3,6 +3,17 @@ import 'package:test/test.dart';
 
 void main() {
   group('S2CellId', () {
+    test('S2CellID.latlng', () {
+      var ll = S2CellId(5185027895138811904).latLng();
+      var expectedLL =
+          S2LatLng.fromDegrees(45.78147499434792, 4.799570770239867);
+      expect(ll.lat.degrees.round(), expectedLL.lat.degrees.round());
+
+      var ll2 = S2CellId(226402483348101380).latLng();
+      var expectedLL2 =
+          S2LatLng.fromDegrees(-32.32163872204854, -3.232390648508235);
+      expect(ll2.lat.degrees.round(), expectedLL2.lat.degrees.round());
+    });
     test('S2CellId.fromLatLng', () {
       expect(
           new S2CellId.fromLatLng(
@@ -76,24 +87,42 @@ void main() {
           0xb112966aaaaaaaab);
     });
     test('S2CellId.parent', () {
-      expect(new S2CellId(0x47a1cbd595522b39).parent(), new S2CellId(0x47a1cbd595522b39).immediateParent());
-      expect(new S2CellId(0x47a1cbd595522b39).parent(29), new S2CellId(0x47a1cbd595522b39).immediateParent());
-      expect(new S2CellId(0x47a1cbd595522b39).parent(28), new S2CellId(0x47a1cbd595522b39).immediateParent().immediateParent());
-      expect(new S2CellId(0x47a1cbd595522b39).parent(28).id, 0x47a1cbd595522b30);
+      expect(new S2CellId(0x47a1cbd595522b39).parent(),
+          new S2CellId(0x47a1cbd595522b39).immediateParent());
+      expect(new S2CellId(0x47a1cbd595522b39).parent(29),
+          new S2CellId(0x47a1cbd595522b39).immediateParent());
+      expect(new S2CellId(0x47a1cbd595522b39).parent(28),
+          new S2CellId(0x47a1cbd595522b39).immediateParent().immediateParent());
+      expect(
+          new S2CellId(0x47a1cbd595522b39).parent(28).id, 0x47a1cbd595522b30);
       expect(new S2CellId(0x47a1cbd595522b39).parent(13).level, 13);
     });
     test('S2CellId.operator', () {
-      expect(new S2CellId(0xf7a1cbd595522b39) > new S2CellId(0x07a1cbd595522b39), isTrue);
-      expect(new S2CellId(0xf7a1cbd595522b39) > new S2CellId(0xe7a1cbd595522b39), isTrue);
-      expect(new S2CellId(0x17a1cbd595522b39) > new S2CellId(0x07a1cbd595522b39), isTrue);
-      expect(new S2CellId(0xf7a1cbd595522b39) < new S2CellId(0x07a1cbd595522b39), isFalse);
-      expect(new S2CellId(0xf7a1cbd595522b39) < new S2CellId(0xe7a1cbd595522b39), isFalse);
-      expect(new S2CellId(0x17a1cbd595522b39) < new S2CellId(0x07a1cbd595522b39), isFalse);
+      expect(
+          new S2CellId(0xf7a1cbd595522b39) > new S2CellId(0x07a1cbd595522b39),
+          isTrue);
+      expect(
+          new S2CellId(0xf7a1cbd595522b39) > new S2CellId(0xe7a1cbd595522b39),
+          isTrue);
+      expect(
+          new S2CellId(0x17a1cbd595522b39) > new S2CellId(0x07a1cbd595522b39),
+          isTrue);
+      expect(
+          new S2CellId(0xf7a1cbd595522b39) < new S2CellId(0x07a1cbd595522b39),
+          isFalse);
+      expect(
+          new S2CellId(0xf7a1cbd595522b39) < new S2CellId(0xe7a1cbd595522b39),
+          isFalse);
+      expect(
+          new S2CellId(0x17a1cbd595522b39) < new S2CellId(0x07a1cbd595522b39),
+          isFalse);
     });
     test('S2CellId.toToken', () {
       expect(new S2CellId(0x47a1cbd595522b39).toToken(), "47a1cbd595522b39");
-      expect(new S2CellId(0x47a1cbd595522b39).parent(29).toToken(), "47a1cbd595522b3c");
-      expect(new S2CellId(0x47a1cbd595522b39).parent(28).toToken(), "47a1cbd595522b3");
+      expect(new S2CellId(0x47a1cbd595522b39).parent(29).toToken(),
+          "47a1cbd595522b3c");
+      expect(new S2CellId(0x47a1cbd595522b39).parent(28).toToken(),
+          "47a1cbd595522b3");
     });
   });
 }