diff --git a/libs/usd-pointcloud-core/src/PointCloud.cpp b/libs/usd-pointcloud-core/src/PointCloud.cpp
index 6a4b319..9f914b4 100644
--- a/libs/usd-pointcloud-core/src/PointCloud.cpp
+++ b/libs/usd-pointcloud-core/src/PointCloud.cpp
@@ -157,6 +157,18 @@ namespace {
 
 constexpr double kPoseTolerance = 1.0e-9;
 
+bool HasSameGeoReference(const usdgeo::GeoReference& first,
+                         const usdgeo::GeoReference& second) {
+    return first.epsgCode == second.epsgCode && first.wkt == second.wkt &&
+           first.projJson == second.projJson &&
+           first.linearUnit == second.linearUnit &&
+           first.sourceUpAxis == second.sourceUpAxis &&
+           first.stageUpAxis == second.stageUpAxis &&
+           first.localOrigin.x == second.localOrigin.x &&
+           first.localOrigin.y == second.localOrigin.y &&
+           first.localOrigin.z == second.localOrigin.z;
+}
+
 bool IsRigidPose(const std::array<double, 16>& pose) {
     if (!std::all_of(pose.begin(), pose.end(),
                      [](double value) { return std::isfinite(value); }) ||
@@ -252,7 +264,9 @@ bool PointCloudCollection::IsValid() const noexcept {
     }
     std::set<std::string> ids;
     for (const auto& scan : scans) {
-        if (!scan.IsValid() || !ids.insert(scan.id).second ||
+        if (!scan.IsValid() ||
+            !HasSameGeoReference(reference, scan.asset.reference) ||
+            !ids.insert(scan.id).second ||
             !ContainsTransformedBounds(bounds, scan)) {
             return false;
         }
diff --git a/libs/usd-pointcloud-core/tests/test_point_cloud.cpp b/libs/usd-pointcloud-core/tests/test_point_cloud.cpp
index 3beae03..50fec45 100644
--- a/libs/usd-pointcloud-core/tests/test_point_cloud.cpp
+++ b/libs/usd-pointcloud-core/tests/test_point_cloud.cpp
@@ -99,6 +99,11 @@ void TestMultiScanContract() {
     collection.bounds.maximum.x = 5.0;
     Check(collection.IsValid());
 
+    second.asset.reference.epsgCode = 4979;
+    collection.scans[1] = second;
+    Check(!collection.IsValid());
+
+    second.asset.reference = reference;
     second.id = first.id;
     collection.scans[1] = second;
     Check(!collection.IsValid());