diff --git a/modules/3d-tiles/src/lib/parsers/helpers/parse-3d-implicit-tiles.ts b/modules/3d-tiles/src/lib/parsers/helpers/parse-3d-implicit-tiles.ts
index 0223ab8633..3e70acbe22 100644
--- a/modules/3d-tiles/src/lib/parsers/helpers/parse-3d-implicit-tiles.ts
+++ b/modules/3d-tiles/src/lib/parsers/helpers/parse-3d-implicit-tiles.ts
@@ -10,12 +10,12 @@ import Long from 'long';
 import {Tiles3DLoaderOptions} from '../../../tiles-3d-loader';
 import {ImplicitOptions} from '../parse-3d-tile-header';
 
-const QUADTREE_DEVISION_COUNT = 4;
-const OCTREE_DEVISION_COUNT = 8;
+const QUADTREE_DIVISION_COUNT = 4;
+const OCTREE_DIVISION_COUNT = 8;
 
 const SUBDIVISION_COUNT_MAP = {
-  QUADTREE: QUADTREE_DEVISION_COUNT,
-  OCTREE: OCTREE_DEVISION_COUNT
+  QUADTREE: QUADTREE_DIVISION_COUNT,
+  OCTREE: OCTREE_DIVISION_COUNT
 };
 
 /**
@@ -103,17 +103,20 @@ export async function parseImplicitTiles(params: {
       z: 0
     },
     childIndex = 0,
+    s2VolumeBox,
+    loaderOptions
+  } = params;
+  let {
+    subtree,
+    level = 0,
     globalData = {
       level: 0,
       mortonIndex: 0,
       x: 0,
       y: 0,
       z: 0
-    },
-    s2VolumeBox,
-    loaderOptions
+    }
   } = params;
-  let {subtree, level = 0} = params;
   const {
     subdivisionScheme,
     subtreeLevels,
@@ -163,9 +166,9 @@ export async function parseImplicitTiles(params: {
     );
   }
 
-  const x = concatBits(globalData.x, childTileX, level * bitsPerTile);
-  const y = concatBits(globalData.y, childTileY, level * bitsPerTile);
-  const z = concatBits(globalData.z, childTileZ, level * bitsPerTile);
+  const x = concatBits(globalData.x, childTileX, level);
+  const y = concatBits(globalData.y, childTileY, level);
+  const z = concatBits(globalData.z, childTileZ, level);
 
   if (isChildSubtreeAvailable) {
     const subtreePath = `${basePath}/${subtreesUriTemplate}`;
@@ -174,11 +177,13 @@ export async function parseImplicitTiles(params: {
 
     subtree = childSubtree;
 
-    globalData.mortonIndex = childTileMortonIndex;
-    globalData.x = childTileX;
-    globalData.y = childTileY;
-    globalData.z = childTileZ;
-    globalData.level = level;
+    globalData = {
+      mortonIndex: childTileMortonIndex,
+      x: childTileX,
+      y: childTileY,
+      z: childTileZ,
+      level
+    };
 
     childTileMortonIndex = 0;
     tileAvailabilityIndex = 0;
diff --git a/modules/3d-tiles/src/lib/parsers/parse-3d-tile-header.ts b/modules/3d-tiles/src/lib/parsers/parse-3d-tile-header.ts
index c0b5cac9a6..29ded359ec 100644
--- a/modules/3d-tiles/src/lib/parsers/parse-3d-tile-header.ts
+++ b/modules/3d-tiles/src/lib/parsers/parse-3d-tile-header.ts
@@ -80,6 +80,12 @@ function getRefine(refine?: string): TILE_REFINEMENT | string | undefined {
 }
 
 function resolveUri(uri: string = '', basePath: string): string {
+  if (uri === '') {
+    // if there's no URI we don't want to make a request to just the basePath
+    // and the URI may not exist if we're dealing with a sparse implicit tileset
+    return '';
+  }
+
   // url scheme per RFC3986
   const urlSchemeRegex = /^[a-z][0-9a-z+.-]*:/i;
 
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diff --git a/modules/3d-tiles/test/data/SparseOctree/tileset.json b/modules/3d-tiles/test/data/SparseOctree/tileset.json
index 2f3c8ecc98..fb73e3ba75 100644
--- a/modules/3d-tiles/test/data/SparseOctree/tileset.json
+++ b/modules/3d-tiles/test/data/SparseOctree/tileset.json
@@ -1,33 +1,24 @@
-
 {
-  "asset": {
-    "version": "1.0"
+  "asset" : {
+    "version" : "1.1"
   },
-  "geometricError": 10000,
-  "extensionsUsed": [
-    "3DTILES_implicit_tiling"
-  ],
-  "extensionsRequired": [
-    "3DTILES_implicit_tiling"
-  ],
-  "root": {
-    "boundingVolume": {
-      "region": [-1.318, 0.697, -1.319, 0.698, 0, 20]
+  "geometricError" : 1024.0,
+  "root" : {
+    "boundingVolume" : {
+      "box" : [ 0.5, 0.5, 0.5, 0.5, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.5 ]
     },
-    "refine": "ADD",
-    "geometricError": 5000,
-    "content": {
-      "uri": "content/{level}/{x}/{y}/{z}.pnts"
+    "geometricError" : 32.0,
+    "refine" : "ADD",
+    "content" : {
+      "uri" : "content/{level}/{x}/{y}/{z}.glb"
     },
-    "extensions": {
-      "3DTILES_implicit_tiling": {
-        "subdivisionScheme": "OCTREE",
-        "subtreeLevels": 2,
-        "maximumLevel": 5,
-        "subtrees": {
-          "uri": "subtrees/{level}/{x}/{y}/{z}.subtree"
-        }
+    "implicitTiling" : {
+      "subdivisionScheme" : "OCTREE",
+      "subtreeLevels" : 3,
+      "availableLevels" : 6,
+      "subtrees" : {
+        "uri" : "subtrees/{level}/{x}/{y}/{z}.subtree"
       }
     }
   }
-}
+}
\ No newline at end of file
diff --git a/modules/3d-tiles/test/tile-3d-subtree-loader.spec.ts b/modules/3d-tiles/test/tile-3d-subtree-loader.spec.ts
index ed665c8837..d0db3c48a1 100644
--- a/modules/3d-tiles/test/tile-3d-subtree-loader.spec.ts
+++ b/modules/3d-tiles/test/tile-3d-subtree-loader.spec.ts
@@ -48,17 +48,33 @@ test('Tile3DSubtreeLoader#Should load quadtree subtree with expicitBitstream', a
 
 test('Tile3DSubtreeLoader#Should load octree subtree with expicitBitstream', async (t) => {
   const EXPECTED = {
-    buffers: [{byteLength: 9}],
+    buffers: [{byteLength: 96}],
     bufferViews: [
-      {buffer: 0, byteOffset: 0, byteLength: 1},
-      {buffer: 0, byteOffset: 1, byteLength: 8}
+      {buffer: 0, byteOffset: 0, byteLength: 10},
+      {buffer: 0, byteOffset: 16, byteLength: 10},
+      {buffer: 0, byteOffset: 32, byteLength: 64}
     ],
-    tileAvailability: {bufferView: 0, explicitBitstream: new Uint8Array([3])},
-    childSubtreeAvailability: {
-      bufferView: 1,
-      explicitBitstream: new Uint8Array([2, 0, 0, 0, 0, 0, 0, 0])
+    tileAvailability: {
+      bitstream: 0,
+      availableCount: 14,
+      explicitBitstream: new Uint8Array([31, 1, 2, 3, 3, 1, 0, 0, 2, 1])
     },
-    contentAvailability: {bufferView: 0, explicitBitstream: new Uint8Array([3])}
+    contentAvailability: [
+      {
+        bitstream: 1,
+        availableCount: 3,
+        explicitBitstream: new Uint8Array([2, 0, 2, 1, 0, 0, 0, 0, 0, 0])
+      }
+    ],
+    childSubtreeAvailability: {
+      bitstream: 2,
+      availableCount: 12,
+      explicitBitstream: new Uint8Array([
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 129, 0, 0, 0, 0, 0, 0, 129, 129, 0, 0, 0, 0,
+        0, 0, 129, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 129, 0,
+        0, 0, 0, 0, 0, 129
+      ])
+    }
   };
 
   const availabilitySubtree = await load(
diff --git a/modules/3d-tiles/test/tiles-3d-loader.spec.ts b/modules/3d-tiles/test/tiles-3d-loader.spec.ts
index af152676a2..b7684bf3ef 100644
--- a/modules/3d-tiles/test/tiles-3d-loader.spec.ts
+++ b/modules/3d-tiles/test/tiles-3d-loader.spec.ts
@@ -22,6 +22,14 @@ const IMPLICIT_FULL_AVAILABLE_QUADTREE_TILESET_URL =
   '@loaders.gl/3d-tiles/test/data/FullQuadtree/tileset.json';
 const IMPLICIT_QUADTREE_TILESET_URL = '@loaders.gl/3d-tiles/test/data/BasicExample/tileset.json';
 
+function checkRegionBoundingBox(t, tile) {
+  if (tile.children.length) {
+    return tile.children.forEach((childTile) => checkRegionBoundingBox(t, childTile));
+  }
+
+  return t.ok(tile.boundingVolume.box) && t.equal(tile.boundingVolume.box.length, 12);
+}
+
 function checkRegionBoundingVolumes(t, tile) {
   if (tile.children.length) {
     return tile.children.forEach((childTile) => checkRegionBoundingVolumes(t, childTile));
@@ -131,13 +139,11 @@ test('Tiles3DLoader#Tile GLTF content extension', async (t) => {
 
 // eslint-disable-next-line max-statements
 test('Tiles3DLoader#Implicit Octree Tileset with bitstream availability and subtrees', async (t) => {
-  const ROOT_EXTENSION_EXPECTED = {
-    '3DTILES_implicit_tiling': {
-      subdivisionScheme: 'OCTREE',
-      subtreeLevels: 2,
-      maximumLevel: 5,
-      subtrees: {uri: 'subtrees/{level}/{x}/{y}/{z}.subtree'}
-    }
+  const IMPLICIT_TILING_EXPECTED = {
+    subdivisionScheme: 'OCTREE',
+    subtreeLevels: 3,
+    availableLevels: 6,
+    subtrees: {uri: 'subtrees/{level}/{x}/{y}/{z}.subtree'}
   };
 
   const response = await fetchFile(IMPLICIT_OCTREE_TILESET_URL);
@@ -145,38 +151,62 @@ test('Tiles3DLoader#Implicit Octree Tileset with bitstream availability and subt
 
   // root
   t.ok(tileset);
-  t.equal(tileset.extensionsRequired[0], '3DTILES_implicit_tiling');
-  t.equal(tileset.extensionsUsed[0], '3DTILES_implicit_tiling');
   t.ok(tileset.root);
-  t.equal(tileset.root.content.uri, 'content/0/0/0/0.pnts');
-  t.equal(tileset.root.lodMetricValue, 5000);
-  t.equal(tileset.root.type, 'pointcloud');
+  t.deepEqual(tileset.root.implicitTiling, IMPLICIT_TILING_EXPECTED);
+  t.equal(tileset.root.implicitTiling.subdivisionScheme, 'OCTREE');
+  t.equal(tileset.root.implicitTiling.subtreeLevels, 3);
+  t.equal(tileset.root.implicitTiling.availableLevels, 6);
+
+  t.equal(tileset.root.content.uri, 'content/{level}/{x}/{y}/{z}.glb');
+  t.equal(tileset.root.lodMetricValue, 32);
+  t.equal(tileset.root.type, 'empty');
   t.equal(tileset.root.refine, 1);
-  t.equal(tileset.root.children.length, 1);
-  t.deepEqual(tileset.root.extensions, ROOT_EXTENSION_EXPECTED);
+  t.equal(tileset.root.children.length, 5);
 
-  // children level 1
-  t.equal(tileset.root.children[0].content.uri, 'content/1/0/0/0.pnts');
-  t.equal(tileset.root.children[0].lodMetricValue, 2500);
-  t.equal(tileset.root.children[0].refine, 1);
-  t.equal(tileset.root.children[0].type, 'pointcloud');
-  t.equal(tileset.root.children[0].children.length, 1);
-
-  // children level 2
-  t.equal(tileset.root.children[0].children[0].content.uri, 'content/2/1/0/0.pnts');
-  t.equal(tileset.root.children[0].children[0].lodMetricValue, 1250);
-  t.equal(tileset.root.children[0].children[0].refine, 1);
-  t.equal(tileset.root.children[0].children[0].type, 'pointcloud');
-  t.equal(tileset.root.children[0].children[0].children.length, 1);
-
-  // children level 3
-  t.equal(tileset.root.children[0].children[0].children[0].content.uri, 'content/3/8/0/1.pnts');
-  t.equal(tileset.root.children[0].children[0].children[0].lodMetricValue, 625);
-  t.equal(tileset.root.children[0].children[0].children[0].refine, 1);
-  t.equal(tileset.root.children[0].children[0].children[0].type, 'pointcloud');
-  t.equal(tileset.root.children[0].children[0].children[0].children.length, 0);
+  // first children tree
+  t.equal(tileset.root.children[0].type, 'scenegraph');
+  t.equal(tileset.root.children[0].content.uri, 'content/1/0/0/0.glb');
+  t.equal(tileset.root.children[0].children.length, 0);
 
-  checkRegionBoundingVolumes(t, tileset.root);
+  // second children tree
+  t.equal(tileset.root.children[1].content.uri, '');
+  t.equal(tileset.root.children[1].children[0].content.uri, 'content/2/2/0/0.glb');
+  t.equal(tileset.root.children[1].children[1].content.uri, 'content/2/3/1/1.glb');
+
+  // third children tree
+  t.equal(tileset.root.children[2].content.uri, '');
+  t.equal(tileset.root.children[2].children[0].content.uri, '');
+  t.equal(tileset.root.children[2].children[0].children[0].content.uri, 'content/3/0/4/0.glb');
+  t.equal(tileset.root.children[2].children[0].children[1].content.uri, 'content/3/1/5/1.glb');
+
+  // fourth children tree
+  t.equal(tileset.root.children[3].content.uri, '');
+  t.equal(tileset.root.children[3].children[0].content.uri, '');
+  t.equal(tileset.root.children[3].children[0].children[0].content.uri, '');
+  t.equal(
+    tileset.root.children[3].children[0].children[0].children[0].content.uri,
+    'content/4/8/8/0.glb'
+  );
+  t.equal(
+    tileset.root.children[3].children[0].children[0].children[1].content.uri,
+    'content/4/9/9/1.glb'
+  );
+
+  // fifth children tree
+  t.equal(tileset.root.children[4].content.uri, '');
+  t.equal(tileset.root.children[4].children[0].content.uri, '');
+  t.equal(tileset.root.children[4].children[0].children[0].content.uri, '');
+  t.equal(tileset.root.children[4].children[0].children[0].children[0].content.uri, '');
+  t.equal(
+    tileset.root.children[4].children[0].children[0].children[0].children[0].content.uri,
+    'content/5/16/16/16.glb'
+  );
+  t.equal(
+    tileset.root.children[4].children[0].children[0].children[0].children[1].content.uri,
+    'content/5/17/17/17.glb'
+  );
+
+  checkRegionBoundingBox(t, tileset.root);
 
   t.end();
 });