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    // access to properties
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    // access to properties
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    int id() const { return mId; }
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    int id() const { return mId; }
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    int age() const { return mAge; }
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    int age() const { return mAge; }
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    /// @property position The tree does not store the floating point coordinates but only the index of pixel on the LIF grid
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    /// @property position The tree does not store the floating point coordinates but only the index of pixel on the LIF grid
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    const QPointF position() const { Q_ASSERT(mGrid!=0); return mGrid->cellCenterPoint(mPositionIndex); }
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    const QPointF position() const { Q_ASSERT(mGrid!=0); return mGrid->cellCenterPoint(mPositionIndex); }
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    float dbh() const { return mDbh; }
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    float height() const { return mHeight; }
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    const Species* species() const { Q_ASSERT(mRU!=0); return mSpecies; } ///< pointer to the tree species of the tree.
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    const Species* species() const { Q_ASSERT(mRU!=0); return mSpecies; } ///< pointer to the tree species of the tree.
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    const ResourceUnit *ru() const { Q_ASSERT(mRU!=0); return mRU; } ///< pointer to the ressource unit the tree belongs to.
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    const ResourceUnit *ru() const { Q_ASSERT(mRU!=0); return mRU; } ///< pointer to the ressource unit the tree belongs to.
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    float lightResourceIndex() const { return mLRI; } ///< LRI of the tree (update during readStamp())


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    // properties


          

          

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    float dbh() const { return mDbh; } ///< dimater at breast height in cm


          

          

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    float height() const { return mHeight; } ///< tree height in m


          

          

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    float lightResourceIndex() const { return mLRI; } ///< LRI of the tree (updated during readStamp())


          

          

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    float leafArea() const { return mLeafArea; } ///< leaf area (m2) of the tree


          

          

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    double volume() const; ///< volume (m3) of stem volume based on geometry and density calculated on the fly.


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    double volume() const; ///< volume (m3) of stem volume based on geometry and density calculated on the fly.


          

          

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    double basalArea() const; ///< basal area of the tree at breast height in m2


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    double basalArea() const; ///< basal area of the tree at breast height in m2


          

          

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    bool isDead() const { return flag(Tree::TreeDead); } ///< returns true if the tree is already dead.


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    bool isDead() const { return flag(Tree::TreeDead); } ///< returns true if the tree is already dead.


          

          

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    // actions


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    // actions


          

          

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    void die() { setFlag(Tree::TreeDead, true); } ///< kills the tree.


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    void die() { setFlag(Tree::TreeDead, true); } ///< kills the tree.