diff --git a/DDSegmentation/include/DDSegmentation/CylindricalSegmentation.h b/DDSegmentation/include/DDSegmentation/CylindricalSegmentation.h
index f492d805d28c1e0b6d8d5e2c20246a7d84b340eb..1aaafa6140a2ab929ef315bcc14ef854fd40c7d7 100644
--- a/DDSegmentation/include/DDSegmentation/CylindricalSegmentation.h
+++ b/DDSegmentation/include/DDSegmentation/CylindricalSegmentation.h
@@ -21,7 +21,7 @@ public:
 	virtual ~CylindricalSegmentation();
 
 	/// determine the radius based on the cell ID
-	std::string getRadius(const long64& cellID) const;
+	double getRadius(const long64& cellID) const;
 	/// access the field name used for layer
 	std::string getFieldNameLayer() const {
 		return _layerID;
diff --git a/DDSegmentation/src/CylindricalSegmentation.cpp b/DDSegmentation/src/CylindricalSegmentation.cpp
index d3b16631996e03a5255949c7ab51670fe3d54feb..ad79bb1709ed7ead6fb550ca33f2f1f8e7f015d4 100644
--- a/DDSegmentation/src/CylindricalSegmentation.cpp
+++ b/DDSegmentation/src/CylindricalSegmentation.cpp
@@ -49,7 +49,7 @@ CylindricalSegmentation::~CylindricalSegmentation() {
 }
 
 /// determine the radius based on the cell ID
-string CylindricalSegmentation::getRadius(const long64& cellID) const {
+double CylindricalSegmentation::getRadius(const long64& cellID) const {
 	_decoder->setValue(cellID);
 	int layer = (*_decoder)[_layerID];
 	map<int, double>::const_iterator itMap = _layerRadiusMap.find(layer);
diff --git a/DDSegmentation/src/ProjectiveCylinder.cpp b/DDSegmentation/src/ProjectiveCylinder.cpp
index b5bacda6cae8b119b1a8dc08eee41a37d9fd122e..cadbfbe96f8d3f42a1dc79d89830508a870f3b73 100644
--- a/DDSegmentation/src/ProjectiveCylinder.cpp
+++ b/DDSegmentation/src/ProjectiveCylinder.cpp
@@ -57,7 +57,7 @@ ProjectiveCylinder::~ProjectiveCylinder() {
 }
 
 /// determine the local based on the cell ID
-virtual std::vector<double> ProjectiveCylinder::getPosition(const long64& cellID) const {
+std::vector<double> ProjectiveCylinder::getPosition(const long64& cellID) const {
 	double r = getRadius(cellID);
 	double theta = getTheta(cellID);
 	double phi = getPhi(cellID);
diff --git a/DDSegmentation/src/Segmentation.cpp b/DDSegmentation/src/Segmentation.cpp
index 0604f1136fdffe2244d79324afd1123689397136..29a4fe3ad48e1d2c1f0c5f1eeabf90b2c0ae9a81 100644
--- a/DDSegmentation/src/Segmentation.cpp
+++ b/DDSegmentation/src/Segmentation.cpp
@@ -82,12 +82,12 @@ Parameters Segmentation::parameters() const {
 }
 
 /// helper method to convert a bin number to a 1D position
-double CartesianGrid::binToPosition(long64 bin, double cellSize, double offset) const {
+double Segmentation::binToPosition(long64 bin, double cellSize, double offset) const {
 	return bin * cellSize + offset;
 }
 
 /// helper method to convert a 1D position to a cell ID
-int CartesianGrid::positionToBin(double position, double cellSize, double offset) const {
+int Segmentation::positionToBin(double position, double cellSize, double offset) const {
 	if (cellSize == 0.) {
 		throw std::runtime_error("Invalid cell size: 0.0");
 	}