+ * Get the density of the wood
+ *
+ * @return The area (m^2) covered by each tree in the wood.
+ */
+ inline double get_tree_density () const { return tree_density; }
+
+ /**
+ * Get the size of each wood
+ *
+ * @return the average area (m^2) of each wood
+ */
+ inline double get_wood_size () const { return wood_size; }
+
+ /**
+ * Get the tree height.