diff --git a/src/czml3/core.py b/src/czml3/core.py
index 5bbe16f..6ebf5b6 100644
--- a/src/czml3/core.py
+++ b/src/czml3/core.py
@@ -36,7 +36,13 @@ class Packet(BaseCZMLObject):
     properties = attr.ib(default=None)
     position = attr.ib(default=None)
     orientation = attr.ib(default=None)
+    viewFrom = attr.ib(default=None)
     billboard = attr.ib(default=None)
+    box = attr.ib(default=None)
+    corridor = attr.ib(default=None)
+    cylinder = attr.ib(default=None)
+    ellipse = attr.ib(default=None)
+    ellipsoid = attr.ib(default=None)
     label = attr.ib(default=None)
     model = attr.ib(default=None)
     path = attr.ib(default=None)
@@ -44,6 +50,8 @@ class Packet(BaseCZMLObject):
     polygon = attr.ib(default=None)
     polyline = attr.ib(default=None)
     rectangle = attr.ib(default=None)
+    tileset = attr.ib(default=None)
+    wall = attr.ib(default=None)
 
 
 @attr.s(repr=False, frozen=True)
diff --git a/src/czml3/properties.py b/src/czml3/properties.py
index 4ccb73c..4da564f 100644
--- a/src/czml3/properties.py
+++ b/src/czml3/properties.py
@@ -138,6 +138,8 @@ class Position(BaseCZMLObject, Interpolatable, Deletable):
     cartesian = attr.ib(default=None)
     cartographicRadians = attr.ib(default=None)
     cartographicDegrees = attr.ib(default=None)
+    cartesianVelocity = attr.ib(default=None)
+    reference = attr.ib(default=None)
 
     def __attrs_post_init__(self,):
         if all(
@@ -146,6 +148,8 @@ def __attrs_post_init__(self,):
                 self.cartesian,
                 self.cartographicDegrees,
                 self.cartographicRadians,
+                self.cartesianVelocity,
+                self.reference,
             )
         ):
             raise ValueError(
@@ -175,6 +179,77 @@ class EllipsoidRadii(BaseCZMLObject, Interpolatable, Deletable):
     reference = attr.ib(default=None)
 
 
+@attr.s(repr=False, frozen=True, kw_only=True)
+class Corridor(BaseCZMLObject):
+    """A corridor , which is a shape defined by a centerline and width that conforms to the
+    curvature of the body shape. It can can optionally be extruded into a volume."""
+
+    positions = attr.ib()
+    show = attr.ib(default=None)
+    width = attr.ib()
+    height = attr.ib(default=None)
+    heightReference = attr.ib(default=None)
+    extrudedHeight = attr.ib(default=None)
+    extrudedHeightReference = attr.ib(default=None)
+    cornerType = attr.ib(default=None)
+    granularity = attr.ib(default=None)
+    fill = attr.ib(default=None)
+    material = attr.ib(default=None)
+    outline = attr.ib(default=None)
+    outlineColor = attr.ib(default=None)
+    outlineWidth = attr.ib(default=None)
+    shadows = attr.ib(default=None)
+    distanceDisplayCondition = attr.ib(default=None)
+    classificationType = attr.ib(default=None)
+    zIndex = attr.ib(default=None)
+
+
+@attr.s(repr=False, frozen=True, kw_only=True)
+class Cylinder(BaseCZMLObject):
+    """A cylinder, which is a special cone defined by length, top and bottom radius."""
+
+    length = attr.ib()
+    show = attr.ib(default=None)
+    topRadius = attr.ib()
+    bottomRadius = attr.ib()
+    heightReference = attr.ib(default=None)
+    fill = attr.ib(default=None)
+    material = attr.ib(default=None)
+    outline = attr.ib(default=None)
+    outlineColor = attr.ib(default=None)
+    outlineWidth = attr.ib(default=None)
+    numberOfVerticalLines = attr.ib(default=None)
+    slices = attr.ib(default=None)
+    shadows = attr.ib(default=None)
+    distanceDisplayCondition = attr.ib(default=None)
+
+
+@attr.s(repr=False, frozen=True, kw_only=True)
+class Ellipse(BaseCZMLObject):
+    """An ellipse, which is a close curve, on or above Earth's surface."""
+
+    semiMajorAxis = attr.ib()
+    semiMinorAxis = attr.ib()
+    show = attr.ib(default=None)
+    height = attr.ib(default=None)
+    heightReference = attr.ib(default=None)
+    extrudedHeight = attr.ib(default=None)
+    extrudedHeightReference = attr.ib(default=None)
+    rotation = attr.ib(default=None)
+    stRotation = attr.ib(default=None)
+    granularity = attr.ib(default=None)
+    fill = attr.ib(default=None)
+    material = attr.ib(default=None)
+    outline = attr.ib(default=None)
+    outlineColor = attr.ib(default=None)
+    outlineWidth = attr.ib(default=None)
+    numberOfVerticalLines = attr.ib(default=None)
+    shadows = attr.ib(default=None)
+    distanceDisplayCondition = attr.ib(default=None)
+    classificationType = attr.ib(default=None)
+    zIndex = attr.ib(default=None)
+
+
 @attr.s(repr=False, frozen=True, kw_only=True)
 class Polygon(BaseCZMLObject):
     """A polygon, which is a closed figure on the surface of the Earth."""
@@ -396,6 +471,34 @@ class Point(BaseCZMLObject):
     disableDepthTestDistance = attr.ib(default=None)
 
 
+@attr.s(repr=False, frozen=True, kw_only=True)
+class TileSet(BaseCZMLObject):
+    """A 3D Tiles tileset."""
+
+    show = attr.ib(default=None)
+    uri = attr.ib()
+    maximumScreenSpaceError = attr.ib(default=None)
+
+
+@attr.s(repr=False, frozen=True, kw_only=True)
+class Wall(BaseCZMLObject):
+    """A two-dimensional wall defined as a line strip and optional maximum and minimum heights.
+     It  conforms to the curvature of the globe and can be placed along the surface or at altitude."""
+
+    show = attr.ib(default=None)
+    positions = attr.ib()
+    minimumHeights = attr.ib(default=None)
+    maximumHeights = attr.ib(default=None)
+    granularity = attr.ib(default=None)
+    fill = attr.ib(default=None)
+    material = attr.ib(default=None)
+    outline = attr.ib(default=None)
+    outlineColor = attr.ib(default=None)
+    outlineWidth = attr.ib(default=None)
+    shadows = attr.ib(default=None)
+    distanceDisplayCondition = attr.ib(default=None)
+
+
 @attr.s(repr=False, frozen=True, kw_only=True)
 class NearFarScalar(BaseCZMLObject, Interpolatable, Deletable):
     """ A numeric value which will be linearly interpolated between two values based on an object's distance from the
diff --git a/tests/test_properties.py b/tests/test_properties.py
index 2bc6902..ee80f9e 100644
--- a/tests/test_properties.py
+++ b/tests/test_properties.py
@@ -11,6 +11,8 @@
     ClassificationType,
     Color,
     DistanceDisplayCondition,
+    Ellipsoid,
+    EllipsoidRadii,
     EyeOffset,
     GridMaterial,
     ImageMaterial,
@@ -364,6 +366,15 @@ def test_position_cartographic_degrees():
     assert repr(pos) == expected_result
 
 
+def test_position_reference():
+    expected_result = """{
+    "reference": "satellite"
+}"""
+    pos = Position(reference="satellite")
+
+    assert repr(pos) == expected_result
+
+
 def test_single_interval_value():
     expected_result = """{
     "interval": "2019-01-01T00:00:00Z/2019-01-02T00:00:00Z",
@@ -436,3 +447,22 @@ def test_bad_uri_raises_error():
         Uri(uri="a")
 
     assert "uri must be a URL or a data URI" in excinfo.exconly()
+
+
+def test_ellisoid():
+    expected_result = """{
+    "radii": {
+        "cartesian": [
+            20.0,
+            30.0,
+            40.0
+        ]
+    },
+    "fill": false,
+    "outline": true
+}"""
+
+    ell = Ellipsoid(
+        radii=EllipsoidRadii(cartesian=[20.0, 30.0, 40.0]), fill=False, outline=True
+    )
+    assert repr(ell) == expected_result