diff --git a/particle-track-and-trace/src/layers/EGlyphLayer.cpp b/particle-track-and-trace/src/layers/EGlyphLayer.cpp
index 7a6a3ee..528a4a5 100644
--- a/particle-track-and-trace/src/layers/EGlyphLayer.cpp
+++ b/particle-track-and-trace/src/layers/EGlyphLayer.cpp
@@ -44,9 +44,10 @@ void EGlyphLayer::readCoordinates() {
   this->direction->SetNumberOfTuples(numLats * numLons);
   points->Allocate(numLats * numLons);
 
-
-  auto transform = createCartographicTransformFilter(uvGrid)->GetTransform();
-  double *out = (double *)malloc(3*sizeof(double));
+  // auto transform = createCartographicTransformFilter(uvGrid)->GetTransform();
+  vtkSmartPointer<vtkTransformFilter> filter = createCartographicTransformFilter(uvGrid);
+  auto transform = filter->GetTransform();
+  double *out;
 
   int i = 0;
   int latIndex = 0;
@@ -54,15 +55,14 @@ void EGlyphLayer::readCoordinates() {
     int lonIndex = 0;
     for (double lon: uvGrid->lons) {
       auto [u, v] = (*uvGrid)[0, latIndex, lonIndex];
-      direction->SetTuple3(i, 5*u, 5*v, 0);
+      direction->SetTuple3(i, u/2, v/2, 0);
       // pre-transform the points, so we don't have to include the cartographic transform while running the program.
-      out = transform->TransformPoint(lon, lat, 0);
+      out = transform->TransformPoint(lon, lat, 0.0);
       points->InsertPoint(i++, out[0], out[1], 0);
       lonIndex++;
     }
     latIndex++;
   }
-  // free(out); //FIXME: causes a segfault for some reason? 
 
   this->data->SetPoints(points);
   this->data->GetPointData()->AddArray(this->direction);
@@ -78,6 +78,7 @@ void EGlyphLayer::readCoordinates() {
   vtkNew<vtkGlyph2D> glyph2D;
   glyph2D->SetSourceConnection(arrowSource->GetOutputPort());
   glyph2D->SetInputData(data);
+  // glyph2D->SetInputConnection(transformFilter->GetOutputPort());
   glyph2D->OrientOn();
   glyph2D->ClampingOn();
   glyph2D->SetScaleModeToScaleByVector();
@@ -103,8 +104,8 @@ void EGlyphLayer::updateData(int t) {
   for (int lat = 0; lat < uvGrid->latSize; lat++) {
     for (int lon = 0; lon < uvGrid->lonSize; lon++) {
       auto [u, v] = (*uvGrid)[t/3600, lat, lon];
-      // TODO: might want to multiple the u,v by some factor.
-      this->direction->SetTuple3(i, u, v, 0);
+      // TODO: 5*v scaling stuff should really be a filter transform
+      this->direction->SetTuple3(i, u/2, v/2, 0);
       i++;
     }
   }