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    void createStandStatistics(); ///< helping function to create an initial state for stand statistics
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    void createStandStatistics(); ///< helping function to create an initial state for stand statistics
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    void recreateStandStatistics(); ///< re-build stand statistics after some change happened to the resource unit
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    void recreateStandStatistics(); ///< re-build stand statistics after some change happened to the resource unit
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    void setStockableArea(const double area) { mStockableArea = area; } ///< set stockable area (m2)
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    void setStockableArea(const double area) { mStockableArea = area; } ///< set stockable area (m2)
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    // sapling growth: the height map is per resource unit and holds the maximum height of saplings for each LIF-pixel and all species
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    // sapling growth: the height map is per resource unit and holds the maximum height of saplings for each LIF-pixel and all species
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    // the map itself is a local variable and only filled temporarily.
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    // the map itself is a local variable and only filled temporarily.
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    void setSaplingHeightMap(float *map_pointer) { mSaplingHeightMap=map_pointer; } ///< set (temporal) storage for sapling-height-map
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    void setSaplingHeightMap(float *map_pointer); ///< set (temporal) storage for sapling-height-map
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    /// returns maximum sapling height at point given by point-index (LIF-index).
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    /// returns maximum sapling height at point given by point-index (LIF-index).
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    /// you must call setSaplingHeightMap() with a valid map before.
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    /// you must call setSaplingHeightMap() with a valid map before.
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    float saplingHeightAt(const QPoint &position) const { Q_ASSERT(mSaplingHeightMap); int pixel_index = cPxPerRU*(position.x()-mCornerCoord.x())+(position.y()-mCornerCoord.y()); return mSaplingHeightMap[pixel_index];}
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    float saplingHeightAt(const QPoint &position) const { Q_ASSERT(mSaplingHeightMap); int pixel_index = cPxPerRU*(position.x()-mCornerCoord.x())+(position.y()-mCornerCoord.y()); return mSaplingHeightMap[pixel_index];}
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    /// return maximum sapling height at point 'position' (LIF-index). This call is slower but works witout a prior call
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    /// return maximum sapling height at point 'position' (LIF-index). This call is slower but works witout a prior call
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    /// to setSaplingHeightMap().
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    /// to setSaplingHeightMap().