diff --git a/include/osgTerrain/Locator b/include/osgTerrain/Locator
index 13a95eb2f..afccc208b 100644
--- a/include/osgTerrain/Locator
+++ b/include/osgTerrain/Locator
@@ -60,7 +60,7 @@ class OSGTERRAIN_EXPORT EllipsoidLocator : public osgTerrain::Locator
     public:
 
 
-        EllipsoidLocator(double longitude, double latitude, double deltaLongitude, double deltaLatitude, double height=0.0, double heightScale = 1.0f);
+        EllipsoidLocator(double longitude, double latitude, double deltaLongitude, double deltaLatitude, double height=0.0, double heightScale = 1.0f, double radiusEquator = osg::WGS_84_RADIUS_EQUATOR, double radiusPolar = osg::WGS_84_RADIUS_POLAR);
 
         void setExtents(double longitude, double latitude, double deltaLongitude, double deltaLatitude, double height=0.0, double heightScale = 1.0f);
 
@@ -72,6 +72,7 @@ class OSGTERRAIN_EXPORT EllipsoidLocator : public osgTerrain::Locator
 
         double getHeight() const { return _height; }
 
+        void setEllipsoidModel(osg::EllipsoidModel* em) { _em=em; }
         osg::EllipsoidModel* getEllipsoidModel() { return _em.get(); }
         const osg::EllipsoidModel* getEllipsoidModel() const { return _em.get(); }
 
diff --git a/src/osgTerrain/Locator.cpp b/src/osgTerrain/Locator.cpp
index 15cc4c4f5..ed1d81524 100644
--- a/src/osgTerrain/Locator.cpp
+++ b/src/osgTerrain/Locator.cpp
@@ -80,13 +80,12 @@ bool Locator::computeLocalBounds(Locator& source, osg::Vec3d& bottomLeft, osg::V
 //
 // EllipsoidLocator
 //
-EllipsoidLocator::EllipsoidLocator(double longitude, double latitude, double deltaLongitude, double deltaLatitude, double height, double heightScale)
+EllipsoidLocator::EllipsoidLocator(double longitude, double latitude, double deltaLongitude, double deltaLatitude, double height, double heightScale, double radiusEquator, double radiusPolar)
 {
     setExtents(longitude, latitude, deltaLongitude, deltaLatitude, height, heightScale);
-    _em = new osg::EllipsoidModel;
+    _em = new osg::EllipsoidModel(radiusEquator, radiusPolar);
 }
 
-
 void EllipsoidLocator::setExtents(double longitude, double latitude, double deltaLongitude, double deltaLatitude, double height, double heightScale)
 {
     _longitude = longitude;