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[BHP1-1375] Add Byram Flame Length to Fireline Intensity conversion #59

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rjsheperd merged 3 commits into from
Jan 23, 2026
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[BHP1-1375] Add Byram Flame Length to Fireline Intensity conversion #59

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eab3bd5
[BHP1-1375] Add Byram Flame Length to Fireline Intensity conversion
rjsheperd Jan 16, 2026
f3c3506
Separate active crown flame length
rjsheperd Jan 16, 2026
4b97bff
Increase min. CMake Version
rjsheperd Jan 16, 2026
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2 changes: 1 addition & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
# and links to the qtmain.lib library on Windows.
# *****************************************************************************

CMAKE_MINIMUM_REQUIRED(VERSION 3.2.3)
CMAKE_MINIMUM_REQUIRED(VERSION 3.5.0)

# Make use of c++14
SET(CMAKE_CXX_STANDARD 14)
Expand Down
32 changes: 32 additions & 0 deletions src/behave/behaveUnits.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@

double LengthUnits::toBaseUnits(double value, LengthUnits::LengthUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Length to base units constants
const double INCHES_TO_FEET = 0.08333333333333;
const double METERS_TO_FEET = 3.2808398950131;
Expand Down Expand Up @@ -91,6 +92,7 @@ double LengthUnits::toBaseUnits(double value, LengthUnits::LengthUnitsEnum units

double LengthUnits::fromBaseUnits(double value, LengthUnits::LengthUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Length from base units constants
const double FEET_TO_INCHES = 12;
const double FEET_TO_CENTIMETERS = 30.480;
Expand Down Expand Up @@ -146,6 +148,7 @@ double LengthUnits::fromBaseUnits(double value, LengthUnits::LengthUnitsEnum uni

double SpeedUnits::toBaseUnits(double value, SpeedUnits::SpeedUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Velocity to base units constants
const double METERS_PER_SECOND_TO_FEET_PER_MINUTE = 196.8503937;
const double METERS_PER_MINUTE_TO_FEET_PER_MINUTE = 3.28084;
Expand Down Expand Up @@ -201,6 +204,7 @@ double SpeedUnits::toBaseUnits(double value, SpeedUnits::SpeedUnitsEnum units)

double SpeedUnits::fromBaseUnits(double value, SpeedUnits::SpeedUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Velocity from base units constants
const double FEET_PER_MINUTE_TO_METERS_PER_SECOND = 0.00508;
const double FEET_PER_MINUTE_TO_METERS_PER_MINUTE = 0.3048;
Expand Down Expand Up @@ -256,6 +260,7 @@ double SpeedUnits::fromBaseUnits(double value, SpeedUnits::SpeedUnitsEnum units)

double FractionUnits::toBaseUnits(double value, FractionUnitsEnum units)
{
if (value == 0.0) return 0.0;
if (units == Percent)
{
value /= 100.0;
Expand All @@ -265,6 +270,7 @@ double FractionUnits::toBaseUnits(double value, FractionUnitsEnum units)

double FractionUnits::fromBaseUnits(double value, FractionUnitsEnum units)
{
if (value == 0.0) return 0.0;
if (units == Percent)
{
value *= 100.0;
Expand All @@ -274,6 +280,7 @@ double FractionUnits::fromBaseUnits(double value, FractionUnitsEnum units)

double SlopeUnits::toBaseUnits(double value, SlopeUnitsEnum units)
{
if (value == 0.0) return 0.0;
static const double PI = 3.141592653589793238463;

if (units == Percent)
Expand All @@ -285,6 +292,7 @@ double SlopeUnits::toBaseUnits(double value, SlopeUnitsEnum units)

double SlopeUnits::fromBaseUnits(double value, SlopeUnitsEnum units)
{
if (value == 0.0) return 0.0;
static const double PI = 3.141592653589793238463;

if (units == Percent)
Expand All @@ -296,6 +304,7 @@ double SlopeUnits::fromBaseUnits(double value, SlopeUnitsEnum units)

double DensityUnits::toBaseUnits(double value, DensityUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Denisty to base units constants
//static const double KG_PER_CUBIC_METER_TO_LBS_PER_CUBIC_FOOT = 0.06242796051;
static const double KG_PER_CUBIC_METER_TO_LBS_PER_CUBIC_FOOT = 0.06242781786;
Expand All @@ -309,6 +318,7 @@ double DensityUnits::toBaseUnits(double value, DensityUnitsEnum units)

double DensityUnits::fromBaseUnits(double value, DensityUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Denisty from base units constants
//static const double LBS_PER_CUBIC_FOOT_TO_KG_PER_CUBIC_METER = 16.018463390932;
static const double LBS_PER_CUBIC_FOOT_TO_KG_PER_CUBIC_METER = 16.0185;
Expand All @@ -322,6 +332,7 @@ double DensityUnits::fromBaseUnits(double value, DensityUnitsEnum units)

double LoadingUnits::toBaseUnits(double value, LoadingUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Velocity to base units constants
const double KILOGRAMS_PER_SQUARE_METER_TO_POUNDS_PER_SQUARE_FOOT = 0.2048161436225217;
const double TONS_PER_ACRE_TO_POUNDS_PER_SQUARE_FOOT = 0.045913682277318638;
Expand Down Expand Up @@ -359,6 +370,7 @@ double LoadingUnits::toBaseUnits(double value, LoadingUnitsEnum units)

double LoadingUnits::fromBaseUnits(double value, LoadingUnitsEnum units)
{
if (value == 0.0) return 0.0;
// Velocity to base units constants
const double POUNDS_PER_SQUARE_FOOT_TO_KILOGRAMS_PER_SQUARE_METER = 4.88242763638305;
const double POUNDS_PER_SQUARE_FOOT_TO_TONS_PER_ACRE = 21.78;
Expand Down Expand Up @@ -395,6 +407,7 @@ double LoadingUnits::fromBaseUnits(double value, LoadingUnitsEnum units)
}

double PressureUnits::toBaseUnits(double value, PressureUnitsEnum units) {
if (value == 0.0) return 0.0;
// Pressure to base units constants
const double HECTOPASCAL_TO_PASCAL = 1e2;
const double KILOPASCAL_TO_PASCAL = 1e3;
Expand Down Expand Up @@ -458,6 +471,7 @@ double PressureUnits::toBaseUnits(double value, PressureUnitsEnum units) {
}

double PressureUnits::fromBaseUnits(double value, PressureUnitsEnum units) {
if (value == 0.0) return 0.0;
// Pressure to base units constants
const double HECTOPASCAL_TO_PASCAL = 1e2;
const double KILOPASCAL_TO_PASCAL = 1e3;
Expand Down Expand Up @@ -521,6 +535,7 @@ double PressureUnits::fromBaseUnits(double value, PressureUnitsEnum units) {

double SurfaceAreaToVolumeUnits::toBaseUnits(double value, SurfaceAreaToVolumeUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double SQUARE_METERS_OVER_CUBIC_METERS_TO_SQUARE_FEET_OVER_CUBIC_FEET = 3.280839895013123;

const double SQUARE_INCHES_OVER_CUBIC_INCHES_TO_SQUARE_FEET_OVER_CUBIC_FEET = 0.083333333333333;
Expand Down Expand Up @@ -558,6 +573,7 @@ double SurfaceAreaToVolumeUnits::toBaseUnits(double value, SurfaceAreaToVolumeUn

double SurfaceAreaToVolumeUnits::fromBaseUnits(double value, SurfaceAreaToVolumeUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double SQUARE_FEET_OVER_CUBIC_FEET_TO_SQUARE_METERS_OVER_CUBIC_METERS = 0.3048;
const double SQUARE_FEET_OVER_CUBIC_FEET_TO_SQUARE_INCHES_OVER_CUBIC_INCHES = 12;
const double SQUARE_FEET_OVER_CUBIC_FEET_TO_SQUARE_CENTIMETERS_OVER_CUBIC_CENTIMERS = 30.48;
Expand Down Expand Up @@ -648,6 +664,7 @@ double TemperatureUnits::fromBaseUnits(double value, TemperatureUnitsEnum units)

double TimeUnits::toBaseUnits(double value, TimeUnitsEnum units)
{
if (value == 0.0) return 0.0;
switch (units)
{
case Minutes:
Expand Down Expand Up @@ -685,6 +702,7 @@ double TimeUnits::toBaseUnits(double value, TimeUnitsEnum units)

double TimeUnits::fromBaseUnits(double value, TimeUnitsEnum units)
{
if (value == 0.0) return 0.0;
switch (units)
{
case Minutes:
Expand Down Expand Up @@ -722,6 +740,7 @@ double TimeUnits::fromBaseUnits(double value, TimeUnitsEnum units)

double AreaUnits::toBaseUnits(double value, AreaUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double ACRES_TO_SQUARE_FEET = 43560.002160576107;
const double HECTARES_TO_SQUARE_FEET = 107639.10416709723;
const double SQUARE_METERS_TO_SQUARE_FEET = 10.76391041671;
Expand Down Expand Up @@ -771,6 +790,7 @@ double AreaUnits::toBaseUnits(double value, AreaUnitsEnum units)

double AreaUnits::fromBaseUnits(double value, AreaUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double SQUARE_FEET_TO_ACRES = 2.295684e-05;
const double SQUARE_FEET_TO_HECTARES = 0.0000092903036;
const double SQUARE_FEET_TO_SQUARE_KILOMETERS = 9.290304e-08;
Expand Down Expand Up @@ -820,6 +840,7 @@ double AreaUnits::fromBaseUnits(double value, AreaUnitsEnum units)

double BasalAreaUnits::toBaseUnits(double value, BasalAreaUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double SQUARE_FEET_PER_ACRE_TO_SQUARE_METERS_PER_HECTARE = 0.229568;

switch(units)
Expand All @@ -845,6 +866,7 @@ double BasalAreaUnits::toBaseUnits(double value, BasalAreaUnitsEnum units)

double BasalAreaUnits::fromBaseUnits(double value, BasalAreaUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double SQUARE_METERS_PER_HECTARE_TO_SQUARE_FEET_PER_ACRE = 4.356;
switch(units)
{
Expand All @@ -868,6 +890,7 @@ double BasalAreaUnits::fromBaseUnits(double value, BasalAreaUnitsEnum units)

double HeatOfCombustionUnits::toBaseUnits(double value, HeatOfCombustionUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double KILOJOULES_PER_KILOGRAM_TO_BTUS_PER_POUND = 0.429592;

switch (units)
Expand All @@ -893,6 +916,7 @@ double HeatOfCombustionUnits::toBaseUnits(double value, HeatOfCombustionUnitsEnu

double HeatOfCombustionUnits::fromBaseUnits(double value, HeatOfCombustionUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_POUND_TO_KILOJOULES_PER_KILOGRAM = 2.32779;

switch (units)
Expand All @@ -918,6 +942,7 @@ double HeatOfCombustionUnits::fromBaseUnits(double value, HeatOfCombustionUnitsE

double FirelineIntensityUnits::toBaseUnits(double value, FirelineIntensityUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_FOOT_PER_MINUTE_TO_BTUS_PER_FOOT_PER_SECOND = 0.01666666666666667;
const double KILOJOULES_PER_METER_PER_MINUTE_TO_BTUS_PER_FOOT_PER_SECOND = 0.00481120819;
const double KILOWATTS_PER_METER_TO_BTUS_PER_FOOT_PER_SECOND = 0.2886719;
Expand Down Expand Up @@ -960,6 +985,7 @@ double FirelineIntensityUnits::toBaseUnits(double value, FirelineIntensityUnitsE

double FirelineIntensityUnits::fromBaseUnits(double value, FirelineIntensityUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_FOOT_PER_SECOND_TO_BTUS_PER_FOOT_PER_MINUTE = 60;
const double BTUS_PER_FOOT_PER_SECOND_TO_KILOJOULES_PER_METER_PER_MINUTE = 207.848;
const double BTUS_PER_FOOT_PER_SECOND_TO_KILOWATTS_PER_METER = 3.464140419;
Expand Down Expand Up @@ -1002,6 +1028,7 @@ double FirelineIntensityUnits::fromBaseUnits(double value, FirelineIntensityUnit

double HeatPerUnitAreaUnits::toBaseUnits(double value, HeatPerUnitAreaUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double KILOJOULES_PER_SQUARE_METER_TO_BTUS_PER_SECOND = 0.0879872;
const double KILOWATT_SECONDS_PER_SQUARE_METER_PER_TO_BTUS_PER_SQUARE_FOOT = 0.0879872;

Expand Down Expand Up @@ -1034,6 +1061,7 @@ double HeatPerUnitAreaUnits::toBaseUnits(double value, HeatPerUnitAreaUnitsEnum

double HeatPerUnitAreaUnits::fromBaseUnits(double value, HeatPerUnitAreaUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_SQUARE_FOOT_TO_KILOJOULES_PER_SQUARE_METER = 11.3653;
const double BTUS_PER_SQUARE_FOOT_TO_KILOWATT_SECONDS_PER_SQUARE_METER = 11.3653;

Expand Down Expand Up @@ -1066,6 +1094,7 @@ double HeatPerUnitAreaUnits::fromBaseUnits(double value, HeatPerUnitAreaUnitsEnu

double HeatSourceAndReactionIntensityUnits::toBaseUnits(double value, HeatSourceAndReactionIntensityUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_SQUARE_FOOT_PER_SECOND_TO_BTUS_PER_SQUARE_FOOT_PER_MINUTE = 60;
const double KILOJOULES_PER_SQUARE_METER_PER_MINUTE_TO_BTUS_PER_SQUARE_FOOT_PER_MINUTE = 0.0880549963329497;
const double KILOWATTS_PER_SQUARE_METER_TO_BTUS_PER_SQUARE_FOOT_PER_MINUTE = 5.27921783108615;
Expand Down Expand Up @@ -1108,6 +1137,7 @@ double HeatSourceAndReactionIntensityUnits::toBaseUnits(double value, HeatSource

double HeatSourceAndReactionIntensityUnits::fromBaseUnits(double value, HeatSourceAndReactionIntensityUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_SQUARE_FOOT_PER_MINUTE_TO_BTUS_PER_SQUARE_FOOT_PER_SECOND = 0.01666666666666667;
const double BTUS_PER_SQUARE_FOOT_PER_MINUTE_TO_KILOJOULES_PER_SQUARE_METER_PER_MINUTE = 11.356539;
//const double BTUS_PER_SQUARE_FOOT_PER_MINUTE_TO_KILOWATTS_PER_SQUARE_METER = 0.18927565;
Expand Down Expand Up @@ -1151,6 +1181,7 @@ double HeatSourceAndReactionIntensityUnits::fromBaseUnits(double value, HeatSour

double HeatSinkUnits::toBaseUnits(double value, HeatSinkUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double KILOJOULES_PER_CUBIC_METER_TO_BTUS_PER_CUBIC_FOOT = 0.02681849745789;
switch (units)
{
Expand All @@ -1174,6 +1205,7 @@ double HeatSinkUnits::toBaseUnits(double value, HeatSinkUnitsEnum units)

double HeatSinkUnits::fromBaseUnits(double value, HeatSinkUnitsEnum units)
{
if (value == 0.0) return 0.0;
const double BTUS_PER_CUBIC_FOOT_TO_KILOJOULES_PER_CUBIC_METER = 37.28769673134085;
switch (units)
{
Expand Down
35 changes: 35 additions & 0 deletions src/behave/spot.cpp
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Expand Up @@ -275,13 +275,29 @@ void Spot::calculateSpottingDistanceFromBurningPile()
}
}

// Byram (1959)'s fireline intensity (kW/m) is derived back from flame length (meters)
// \[ I_B = \left( \frac{L}{0.0775} \right)^{1/0.46} \]
double byramFirelineIntensity(double flameLength) {
constexpr double coeff = 0.0775;
constexpr double exponent = 1.0 / 0.46;
return std::pow(flameLength / coeff, exponent);
}

void Spot::calculateSpottingDistanceFromActiveCrown() {

SpotFireLocation::SpotFireLocationEnum location = spotInputs_.getLocation();
double ridgeToValleyDistance = spotInputs_.getRidgeToValleyDistance(LengthUnits::Miles);
double ridgeToValleyElevation = spotInputs_.getRidgeToValleyElevation(LengthUnits::Feet);
double treeHeight = calculateTreeHeight(LengthUnits::Meters);

double firelineIntensity = spotInputs_.getCrownFirelineIntensity(FirelineIntensityUnits::KilowattsPerMeter);
double flameLength = spotInputs_.getActiveCrownFlameLength(LengthUnits::Meters);

// Use Byram (1959) FLI approximation if FLI is null
if ((std::abs(firelineIntensity) < 0.01) && (flameLength > 0.0)) {
firelineIntensity = byramFirelineIntensity(flameLength);
}

double windSpeed = spotInputs_.getWindSpeedAtTwentyFeet(SpeedUnits::KilometersPerHour);;
double windHeight = 6.096; //20ft in meters
double emberDiamMm = 1.0;
Expand Down Expand Up @@ -448,6 +464,11 @@ void Spot::setFlameLength(double flameLength, LengthUnits::LengthUnitsEnum flame
spotInputs_.setSurfaceFlameLength(flameLength, flameLengthUnits);
}

void Spot::setActiveCrownFlameLength(double activeCrownFlameLength, LengthUnits::LengthUnitsEnum flameLengthUnits)
{
spotInputs_.setActiveCrownFlameLength(activeCrownFlameLength, flameLengthUnits);
}

void Spot::setFirelineIntensity(double firelineIntensity, FirelineIntensityUnits::FirelineIntensityUnitsEnum firelineIntensityUnits)
{
spotInputs_.setCrownFirelineIntensity(firelineIntensity, firelineIntensityUnits);
Expand Down Expand Up @@ -517,6 +538,15 @@ void Spot::updateSpotInputsForTorchingTrees(SpotFireLocation::SpotFireLocationEn
windSpeedAtTwentyFeet, windSpeedUnits);
}

void Spot::updateSpotInputsForActiveCrownFire(SpotFireLocation::SpotFireLocationEnum location, double ridgeToValleyDistance,
LengthUnits::LengthUnitsEnum ridgeToValleyDistanceUnits, double ridgeToValleyElevation, LengthUnits::LengthUnitsEnum elevationUnits,
double treeHeight, LengthUnits::LengthUnitsEnum treeHeightUnits, SpotDownWindCanopyMode::SpotDownWindCanopyModeEnum downwindCanopyMode, double windSpeedAtTwentyFeet,
SpeedUnits::SpeedUnitsEnum windSpeedUnits, double activeCrownFlameLength, LengthUnits::LengthUnitsEnum flameLengthUnits)
{
spotInputs_.updateSpotInputsForActiveCrownFire(location, ridgeToValleyDistance, ridgeToValleyDistanceUnits, ridgeToValleyElevation,elevationUnits,
treeHeight, treeHeightUnits, downwindCanopyMode, windSpeedAtTwentyFeet, windSpeedUnits, activeCrownFlameLength, flameLengthUnits);
}

double Spot::getBurningPileFlameHeight(LengthUnits::LengthUnitsEnum flameHeightUnits) const
{
return spotInputs_.getBurningPileFlameHeight(flameHeightUnits);
Expand All @@ -542,6 +572,11 @@ double Spot::getSurfaceFlameLength(LengthUnits::LengthUnitsEnum flameLengthUnits
return spotInputs_.getSurfaceFlameLength(flameLengthUnits);
}

double Spot::getActiveCrownFlameLength(LengthUnits::LengthUnitsEnum flameLengthUnits) const
{
return spotInputs_.getActiveCrownFlameLength(flameLengthUnits);
}

double Spot::getCrownFirelineIntensity(FirelineIntensityUnits::FirelineIntensityUnitsEnum firelineIntensityUnits) const
{
return spotInputs_.getCrownFirelineIntensity(firelineIntensityUnits);
Expand Down
6 changes: 6 additions & 0 deletions src/behave/spot.h
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Expand Up @@ -57,6 +57,7 @@ class Spot
void setDownwindCoverHeight(double downwindCoverHeight, LengthUnits::LengthUnitsEnum coverHeightUnits);
void setDownwindCanopyMode(SpotDownWindCanopyMode::SpotDownWindCanopyModeEnum downwindCanopyMode);
void setFlameLength(double flameLength, LengthUnits::LengthUnitsEnum flameLengthUnits);
void setActiveCrownFlameLength(double activeCrownFlameLength, LengthUnits::LengthUnitsEnum flameLengthUnits);
void setFirelineIntensity(double firelineIntensity, FirelineIntensityUnits::FirelineIntensityUnitsEnum firelineIntensityUnits);
void setLocation(SpotFireLocation::SpotFireLocationEnum location);
void setRidgeToValleyDistance(double ridgeToValleyDistance, LengthUnits::LengthUnitsEnum ridgeToValleyDistanceUnits);
Expand All @@ -80,13 +81,18 @@ class Spot
double downwindCoverHeight, LengthUnits::LengthUnitsEnum coverHeightUnits, SpotDownWindCanopyMode::SpotDownWindCanopyModeEnum downwindCanopyMode,
int torchingTrees, double DBH, LengthUnits::LengthUnitsEnum DBHUnits, double treeHeight, LengthUnits::LengthUnitsEnum treeHeightUnits,
SpotTreeSpecies::SpotTreeSpeciesEnum treeSpecies, double windSpeedAtTwentyFeet, SpeedUnits::SpeedUnitsEnum windSpeedUnits);
void updateSpotInputsForActiveCrownFire(SpotFireLocation::SpotFireLocationEnum location, double ridgeToValleyDistance,
LengthUnits::LengthUnitsEnum ridgeToValleyDistanceUnits, double ridgeToValleyElevation, LengthUnits::LengthUnitsEnum elevationUnits,
double treeHeight, LengthUnits::LengthUnitsEnum treeHeightUnits, SpotDownWindCanopyMode::SpotDownWindCanopyModeEnum downwindCanopyMode,
double windSpeedAtTwentyFeet, SpeedUnits::SpeedUnitsEnum windSpeedUnits, double activeCrownFlameLength, LengthUnits::LengthUnitsEnum flameLengthUnits);

// Spot Inputs Getters
double getBurningPileFlameHeight(LengthUnits::LengthUnitsEnum flameHeightUnits) const;
double getDBH(LengthUnits::LengthUnitsEnum DBHUnits) const;
double getDownwindCoverHeight(LengthUnits::LengthUnitsEnum coverHeightUnits) const;
SpotDownWindCanopyMode::SpotDownWindCanopyModeEnum getDownwindCanopyMode() const;
double getSurfaceFlameLength(LengthUnits::LengthUnitsEnum surfaceFlameLengthUnits) const;
double getActiveCrownFlameLength(LengthUnits::LengthUnitsEnum flameLengthUnits) const;
double getCrownFirelineIntensity(FirelineIntensityUnits::FirelineIntensityUnitsEnum firelineIntensityUnits) const;
SpotFireLocation::SpotFireLocationEnum getLocation() const;
double getRidgeToValleyDistance(LengthUnits::LengthUnitsEnum ridgeToValleyDistanceUnits) const;
Expand Down
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