From 1634cc47c6f0a82fbf312de4288f503161a2c0c8 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 7 Jul 2004 11:28:21 +0000
Subject: [PATCH] Added automatic setting of the verical scale when the
 destination coordinate system is geographic (i.e. lats and longs.).

---
 src/osgTerrain/DataSet.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/osgTerrain/DataSet.cpp b/src/osgTerrain/DataSet.cpp
index dda7c530e..ff595def4 100644
--- a/src/osgTerrain/DataSet.cpp
+++ b/src/osgTerrain/DataSet.cpp
@@ -3238,6 +3238,13 @@ void DataSet::computeDestinationGraphFromSources(unsigned int numLevels)
     }
 
 
+    CoordinateSystemType destinateCoordSytemType = getCoordinateSystemType(_destinationCoordinateSystem.get());
+    if (destinateCoordSytemType==GEOGRAPHIC && !getConvertFromGeographicToGeocentric())
+    {
+        // convert elevation into degrees.
+        setVerticalScale(1.0f/111319.0f);
+    }
+
     // get the extents of the sources and
     osg::BoundingBox extents(_extents);
     if (!extents.valid())