protected synchronized void reIndexPages(HashMap<String,UpdatedTerrainPatch> updated, boolean usesVariableLod) {
        if (children != null) {
            for (int i = children.size(); --i >= 0;) {
                Spatial child = children.get(i);
                if (child instanceof TerrainQuad) {
                    ((TerrainQuad) child).reIndexPages(updated, usesVariableLod);
                } else if (child instanceof TerrainPatch) {
                    ((TerrainPatch) child).reIndexGeometry(updated, usesVariableLod);
                }
            }
        }
    }
Find any neighbours that should have their edges seamed because another neighbour
changed its LOD to a greater value (less detailed)
jme3-terrain/src/main/java/com/jme3/terrain/geomipmap/TerrainQuad.java