LeafOpticsProperties_Nauto Struct Reference

Parameters for nitrogen-based automatic leaf optics calculation. More...

#include <LeafOptics.h>

Data Fields
float	f_photosynthetic = 0.50f
	Fraction of leaf nitrogen in photosynthetic machinery [0-1].
float	N_to_Cab_coefficient = 0.40f
	Empirical coefficient for chlorophyll calculation.
float	Car_to_Cab_ratio = 0.25f
	Carotenoid to chlorophyll ratio.
float	numberlayers = 1.5f
	Leaf structure parameter (N)
float	anthocyancontent = 1.0f
	Anthocyanin content (ug/cm2)
float	brownpigments = 0.0f
	Brown pigment content (senescence indicator)
float	watermass = 0.015f
	Equivalent water thickness (g/cm2)
float	drymass = 0.006f
	Leaf mass per area (g/cm2)
float	protein = 0.0f
	Protein content (g/cm2) - for PROSPECT-PRO.
float	carbonconstituents = 0.0f
	Carbon constituents (g/cm2) - for PROSPECT-PRO.
float	V2Z = 0.f
	Violaxanthin-zeaxanthin conversion state, [0, 1]. See LeafOpticsProperties.
float	fqe = 1.f
	Intrinsic fluorescence quantum efficiency scalar. See LeafOpticsProperties.
uint	num_bins = 20
	Target number of spectrum bins.
float	reassignment_threshold = 0.30f
	Relative nitrogen change threshold for reassignment.
float	min_reassignment_change = 0.3f
	Minimum absolute nitrogen change for reassignment (g/m2)

Detailed Description

Parameters for nitrogen-based automatic leaf optics calculation.

When passed to LeafOptics::run(), chlorophyll and carotenoid content are automatically computed from leaf nitrogen data ("leaf_nitrogen_gN_m2" object data). All other PROSPECT parameters use the values specified in this structure.

The conversion from nitrogen to chlorophyll follows:

• Cab (ug/cm2) = N_area (g/m2) * 100 * f_photosynthetic * N_to_Cab_coefficient
• Car (ug/cm2) = Cab * Car_to_Cab_ratio

Adaptive binning groups leaves by nitrogen content to limit the number of unique spectra, improving computational efficiency in radiation calculations.

Definition at line 79 of file LeafOptics.h.

Field Documentation

anthocyancontent

float LeafOpticsProperties_Nauto::anthocyancontent = 1.0f

Anthocyanin content (ug/cm2)

Definition at line 97 of file LeafOptics.h.

brownpigments

float LeafOpticsProperties_Nauto::brownpigments = 0.0f

Brown pigment content (senescence indicator)

Definition at line 98 of file LeafOptics.h.

Car_to_Cab_ratio

float LeafOpticsProperties_Nauto::Car_to_Cab_ratio = 0.25f

Carotenoid to chlorophyll ratio.

Car = Cab * Car_to_Cab_ratio

Definition at line 92 of file LeafOptics.h.

carbonconstituents

float LeafOpticsProperties_Nauto::carbonconstituents = 0.0f

Carbon constituents (g/cm2) - for PROSPECT-PRO.

Definition at line 102 of file LeafOptics.h.

drymass

float LeafOpticsProperties_Nauto::drymass = 0.006f

Leaf mass per area (g/cm2)

Definition at line 100 of file LeafOptics.h.

f_photosynthetic

float LeafOpticsProperties_Nauto::f_photosynthetic = 0.50f

Fraction of leaf nitrogen in photosynthetic machinery [0-1].

Definition at line 84 of file LeafOptics.h.

fqe

float LeafOpticsProperties_Nauto::fqe = 1.f

Intrinsic fluorescence quantum efficiency scalar. See LeafOpticsProperties.

Definition at line 106 of file LeafOptics.h.

min_reassignment_change

float LeafOpticsProperties_Nauto::min_reassignment_change = 0.3f

Minimum absolute nitrogen change for reassignment (g/m2)

Prevents reassignment for small absolute changes even if relative change is large

Definition at line 120 of file LeafOptics.h.

N_to_Cab_coefficient

float LeafOpticsProperties_Nauto::N_to_Cab_coefficient = 0.40f

Empirical coefficient for chlorophyll calculation.

Cab (ug/cm2) = N_area (g/m2) * 100 * f_photosynthetic * N_to_Cab_coefficient

Definition at line 88 of file LeafOptics.h.

num_bins

uint LeafOpticsProperties_Nauto::num_bins = 20

Target number of spectrum bins.

Actual number may be fewer if leaf nitrogen values cluster tightly

Definition at line 112 of file LeafOptics.h.

numberlayers

float LeafOpticsProperties_Nauto::numberlayers = 1.5f

Leaf structure parameter (N)

Definition at line 96 of file LeafOptics.h.

protein

float LeafOpticsProperties_Nauto::protein = 0.0f

Protein content (g/cm2) - for PROSPECT-PRO.

Definition at line 101 of file LeafOptics.h.

reassignment_threshold

float LeafOpticsProperties_Nauto::reassignment_threshold = 0.30f

Relative nitrogen change threshold for reassignment.

Leaf must change by this fraction from bin center to be considered for reassignment

Definition at line 116 of file LeafOptics.h.

V2Z

float LeafOpticsProperties_Nauto::V2Z = 0.f

Violaxanthin-zeaxanthin conversion state, [0, 1]. See LeafOpticsProperties.

Definition at line 105 of file LeafOptics.h.

watermass

float LeafOpticsProperties_Nauto::watermass = 0.015f

Equivalent water thickness (g/cm2)

Definition at line 99 of file LeafOptics.h.

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The documentation for this struct was generated from the following file:

• plugins/leafoptics/include/LeafOptics.h