public override int GrowHeightBigSix(OrganonConfiguration configuration, OrganonStand stand, Trees trees, float[] crownCompetitionByHeight)
{
// WEIGHTED CENTRAL PAI PROCEDURE PARAMETERS FOR RED ALDER
float P1;
float P2;
float P3;
float P4;
float P5;
float P6;
float P7;
float P8;
switch (trees.Species)
{
// Hann, Bluhm, and Hibbs Red Alder Plantation Analysis
case FiaCode.AlnusRubra:
P1 = 0.809837005F;
P2 = -0.0134163653F;
P3 = -0.0609398629F;
P4 = 0.5F;
P5 = 1.0F;
P6 = 2.0F;
P7 = 0.1469442410F;
P8 = 1.0476380753F;
break;
// Hann, Marshall, and Hanus(2006) FRL Research Contribution ??
case FiaCode.PseudotsugaMenziesii:
P1 = 0.655258886F;
P2 = -0.006322913F;
P3 = -0.039409636F;
P4 = 0.5F;
P5 = 0.597617316F;
P6 = 2.0F;
P7 = 0.631643636F;
P8 = 1.010018427F;
break;
// Johnson(2002) Willamette Industries Report
case FiaCode.TsugaHeterophylla:
P1 = 1.0F;
P2 = -0.0384415F;
P3 = -0.0144139F;
P4 = 0.5F;
P5 = 1.04409F;
P6 = 2.0F;
P7 = 0.0F;
P8 = 1.03F;
break;
default:
throw Trees.CreateUnhandledSpeciesException(trees.Species);
}
int oldTreeRecordCount = 0;
for (int treeIndex = 0; treeIndex < trees.Count; ++treeIndex)
{
if (trees.LiveExpansionFactor[treeIndex] <= 0.0F)
{
trees.HeightGrowth[treeIndex] = 0.0F;
continue;
}
float growthEffectiveAge = configuration.Variant.GetGrowthEffectiveAge(configuration, stand, trees, treeIndex, out float potentialHeightGrowth);
float crownCompetitionIncrement = OrganonVariant.GetCrownCompetitionFactorByHeight(trees.Height[treeIndex], crownCompetitionByHeight);
float crownRatio = trees.CrownRatio[treeIndex];
float FCR = -P5 *MathV.Pow(1.0F - crownRatio, P6) * MathV.Exp(P7 * MathF.Sqrt(crownCompetitionIncrement));
float B0 = P1 * MathV.Exp(P2 * crownCompetitionIncrement);
float B1 = MathV.Exp(P3 * MathV.Pow(crownCompetitionIncrement, P4));
float MODIFER = P8 * (B0 + (B1 - B0) * MathV.Exp(FCR));
float CRADJ = OrganonGrowth.GetCrownRatioAdjustment(crownRatio);
float heightGrowth = potentialHeightGrowth * MODIFER * CRADJ;
Debug.Assert(heightGrowth > 0.0F);
trees.HeightGrowth[treeIndex] = heightGrowth;
if (growthEffectiveAge > configuration.Variant.OldTreeAgeThreshold)
{
++oldTreeRecordCount;
}
}
return(oldTreeRecordCount);
}
public override int GrowHeightBigSix(OrganonConfiguration configuration, OrganonStand stand, Trees trees, float[] crownCompetitionByHeight)
{
float P1;
float P2;
float P3;
float P4;
float P5;
float P6;
float P7;
float P8;
switch (trees.Species)
{
// Ritchie and Hann(1990) FRL Research Paper 54
case FiaCode.AbiesGrandis:
P1 = 1.0F;
P2 = -0.0328142F;
P3 = -0.0127851F;
P4 = 1.0F;
P5 = 6.19784F;
P6 = 2.0F;
P7 = 0.0F;
P8 = 1.01F;
break;
case FiaCode.PseudotsugaMenziesii:
P1 = 0.655258886F;
P2 = -0.006322913F;
P3 = -0.039409636F;
P4 = 0.5F;
P5 = 0.597617316F;
P6 = 2.0F;
P7 = 0.631643636F;
P8 = 1.010018427F;
break;
case FiaCode.TsugaHeterophylla:
P1 = 1.0F;
P2 = -0.0384415F;
P3 = -0.0144139F;
P4 = 0.5F;
P5 = 1.04409F;
P6 = 2.0F;
P7 = 0.0F;
P8 = 1.03F;
break;
default:
throw Trees.CreateUnhandledSpeciesException(trees.Species);
}
int oldTreeRecordCount = 0;
for (int treeIndex = 0; treeIndex < trees.Count; ++treeIndex)
{
if (trees.LiveExpansionFactor[treeIndex] <= 0.0F)
{
trees.HeightGrowth[treeIndex] = 0.0F;
continue;
}
float growthEffectiveAge = configuration.Variant.GetGrowthEffectiveAge(configuration, stand, trees, treeIndex, out float potentialHeightGrowth);
float crownCompetitionIncrement = OrganonVariant.GetCrownCompetitionFactorByHeight(trees.Height[treeIndex], crownCompetitionByHeight);
float crownRatio = trees.CrownRatio[treeIndex];
float FCR = -P5 *MathV.Pow(1.0F - crownRatio, P6) * MathV.Exp(P7 * MathF.Sqrt(crownCompetitionIncrement));
float B0 = P1 * MathV.Exp(P2 * crownCompetitionIncrement);
float B1 = MathV.Exp(P3 * MathV.Pow(crownCompetitionIncrement, P4));
float MODIFER = P8 * (B0 + (B1 - B0) * MathF.Exp(FCR)); // changed from MathV due to FCR of -91 being observed
float CRADJ = OrganonGrowth.GetCrownRatioAdjustment(crownRatio);
float heightGrowth = potentialHeightGrowth * MODIFER * CRADJ;
Debug.Assert(heightGrowth > 0.0F);
trees.HeightGrowth[treeIndex] = heightGrowth;
if (growthEffectiveAge > configuration.Variant.OldTreeAgeThreshold)
{
++oldTreeRecordCount;
}
}
return(oldTreeRecordCount);
}
/// <summary>
/// Computes old growth index?
/// </summary>
/// <param name="stand">Stand data.</param>
/// <param name="incrementMultiplier">Zero or minus one, usually zero.</param>
/// <param name="OG">Old growth indicator.</param>
/// <remarks>
/// Supports only to 99 inch DBH.
/// </remarks>
public static float GetOldGrowthIndicator(OrganonVariant variant, OrganonStand stand)
{
// TODO: move diameter class and stand density information into stand for simplified state management and reduced compute
int diameterClasses = 100;
float[] treesPerAcreByDiameterClass = new float[diameterClasses];
float[] weightedDbhByDiameterClass = new float[diameterClasses];
float[] weightedHeightByDiameterClass = new float[diameterClasses];
foreach (Trees treesOfSpecies in stand.TreesBySpecies.Values)
{
if (variant.IsBigSixSpecies(treesOfSpecies.Species) == false)
{
continue;
}
for (int treeIndex = 0; treeIndex < treesOfSpecies.Count; ++treeIndex)
{
float dbhInInches = treesOfSpecies.Dbh[treeIndex];
int dbhIndex = (int)dbhInInches;
if (dbhIndex >= treesPerAcreByDiameterClass.Length)
{
dbhIndex = treesPerAcreByDiameterClass.Length - 1;
}
float expansionFactor = treesOfSpecies.LiveExpansionFactor[treeIndex];
Debug.Assert(expansionFactor >= 0.0F);
Debug.Assert(expansionFactor <= Constant.Maximum.ExpansionFactor);
treesPerAcreByDiameterClass[dbhIndex] += expansionFactor;
weightedDbhByDiameterClass[dbhIndex] += expansionFactor * dbhInInches;
weightedHeightByDiameterClass[dbhIndex] += expansionFactor * treesOfSpecies.Height[treeIndex];
}
}
float largestFiveTpaWeightedHeight = 0.0F;
float largestFiveTpaWeightedDbh = 0.0F;
float largeTreeTpa = 0.0F;
for (int dbhIndex = weightedHeightByDiameterClass.Length - 1; dbhIndex >= 0; --dbhIndex)
{
largestFiveTpaWeightedHeight += weightedHeightByDiameterClass[dbhIndex];
largestFiveTpaWeightedDbh += weightedDbhByDiameterClass[dbhIndex];
largeTreeTpa += treesPerAcreByDiameterClass[dbhIndex];
if (largeTreeTpa > 5.0F)
{
float TRDIFF = treesPerAcreByDiameterClass[dbhIndex] - (largeTreeTpa - 5.0F);
largestFiveTpaWeightedHeight = largestFiveTpaWeightedHeight - weightedHeightByDiameterClass[dbhIndex] + ((weightedHeightByDiameterClass[dbhIndex] / treesPerAcreByDiameterClass[dbhIndex]) * TRDIFF);
largestFiveTpaWeightedDbh = largestFiveTpaWeightedDbh - weightedDbhByDiameterClass[dbhIndex] + ((weightedDbhByDiameterClass[dbhIndex] / treesPerAcreByDiameterClass[dbhIndex]) * TRDIFF);
largeTreeTpa = 5.0F;
break;
}
}
float oldGrowthIndicator = 0.0F;
if (largeTreeTpa > 0.0F)
{
float HT5 = largestFiveTpaWeightedHeight / largeTreeTpa;
float DBH5 = largestFiveTpaWeightedDbh / largeTreeTpa;
oldGrowthIndicator = DBH5 * HT5 / 10000.0F;
Debug.Assert(oldGrowthIndicator >= 0.0F);
Debug.Assert(oldGrowthIndicator <= 1000.0F);
}
return(oldGrowthIndicator);
}