三种植被冠层二向反射分布函数模型的比较

doi:10.3724/SP.J.1258.2012.00055

摘要/Abstract

摘要：

随着定量遥感技术的发展, 描述森林冠层二向反射分布函数(BRDF)的机理模型越来越多。该研究采用3种植被冠层BRDF模型——DART模型、4SCALE模型和MGEOSAIL模型, 模拟了不同郁闭度样地在红光、近红外波段各个观测角度下的场景反射率, 并比较分析了不同BRDF模型的适用性和局限性。结果表明: MGEOSAIL模型只适于模拟样地郁闭度较小、林木个体较大条件下的场景反射率, 且热点效果不十分明显; DART模型和4SCALE模型适于任何郁闭度条件下的场景反射率的模拟, 并且精度较高; 4SCALE模型模拟的场景反射率介于DART模型模拟的1次散射与5次散射之间。这3种模型在模拟近红外波段的场景反射率时, 均存在“碗边”效应。

关键词: 二向反射分布函数, DART模型, MGEOSAIL模型, 4SCALE模型

Abstract:

Aims With the development of quantitative remote sensing technology, multiple bi-directional reflectance distribution function (BRDF) models have been developed to describe reflectance of forest canopies. Our objective is to compare the DART, 4SCALE and MGEOSAIL models for greater understanding their proper use.
Methods We used the BRDF models to simulate reflectance of the scene with different canopy densities at various observation angles in red and near-infrared bands and compared the results to analyze model applicability and limitations.
Important findings The MGEOSAIL model is suitable to simulate the scene reflectance with low canopy density and large trees, and the hotspot is obvious. The DART and 4SCALE models are accurate and suitable to simulate the scene reflectance with various kinds of canopy density. Also, the scene reflectance simulated by 4SCALE is higher than DART’s simulated first-order scattering value, but lower than DART’s fifth-order scattering value. All three models show the “bowl” shape in the near-infrared band.

Key words: bi-directional reflectance distribution function (BRDF), DART model, MGEOSAIL model, 4SCALE model

于颖, 范文义, 杨曦光. 三种植被冠层二向反射分布函数模型的比较. 植物生态学报, 2012, 36(1): 55-62. DOI: 10.3724/SP.J.1258.2012.00055

YU Ying, FAN Wen-Yi, YANG Xi-Guang. Comparisons of three models for vegetation canopy bi-directional reflectance distribution function. Chinese Journal of Plant Ecology, 2012, 36(1): 55-62. DOI: 10.3724/SP.J.1258.2012.00055

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2012.00055

https://www.plant-ecology.com/CN/Y2012/V36/I1/55

图/表 8

参考文献 18

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变量 Variable	变量值 Variable value
变量 Variable	落叶松纯林大样地 Plot of Larix gmelinii	白桦纯林大样地 Plot of Betula platyphylla	纯落叶松疏林大样地 Sparse plot of Larix gmelinii
太阳方位角 Sun azimuth (°)	0	0	0
太阳天顶角 Sun zenith (°)	40	40	40
叶片反射率(红光/近红外) Leaf reflectance (red/near-infrared)	0.015 7 / 0.437 5	0.028 0 / 0.423 9	0.015 7 / 0.437 5
叶片透射率(红光/近红外) Leaf transmissivity (red/near-infrared)	0.006 0 / 0.360 8	0.009 0 / 0.347 6	0.006 0 / 0.360 8
茎干反射率(红光/近红外) Stem reflectance (red/near-infrared)	0.087 7 / 0.243 0	0.011 4 / 0.227 5	0.087 7 / 0.243 0
茎干透射率(红光/近红外) Stem transmissivity (red/near-infrared)	0/0	0/0	0/0
背景反射率(红光/近红外) Background reflectance (red/near-infrared)	0.052 4 / 0.608 4	0.057 3 / 0.379 8	0.052 4/0.608 4
场景叶面积指数 Leaf area index of the scene	3.2	2.9	0.5
树干高 Height of the trunk (m)	16.0	8.2	16.0
冠高 Height of the canopy (m)	7.6	7.6	7.6
冠半径 Canopy radius (m)	1.75	0.95	1.75
枝倾角 Branch dip angle (°)	22.5	27.0	22.5
叶倾角 Leaf dip angle (°)	65	50	65
枝厚度 Branch thickness (m)	0.014 7	0.012 6	0.014 7
叶厚度与宽度之比 Ratio of leaf thickness to width	0.750	0.017	0.750
叶大小 Leaf size (m)	0.005	0.034	0.005
半锥顶角 Half apex angle (°)	35	-	35
簇内针的聚集度 Clumping index of shoots	1.4	-	1.4
树木分布及NEYMAN参数m₂ Tree distribution and NEYMAN parameter m₂	随机分布m₂= 1.0 Random distribution m₂= 1.0	纽曼分布m₂= 2.5 NEYMAN distribution m₂= 2.5	随机分布m₂= 1.0 Random distribution m₂= 1.0
冠型(CONE/CYLI) Crown type (CONE/CYLI)	CONE	CYLI	CONE
冠高与冠宽之比 Ratio of canopy height to width	3.0	3.9	3.0
郁闭度 Canopy density	0.7	0.7	0.1
场景大小 Scene size	100 m × 100 m	50 m × 50 m	100 m × 100 m
地表覆盖类型 Land-cover type	杜鹃 Rhododendron simsii	杜香 Ledum palustre	杜鹃 Rhododendron simsii

变量 Variable	变量值 Variable value
变量 Variable	落叶松纯林大样地 Plot of Larix gmelinii	白桦纯林大样地 Plot of Betula platyphylla	纯落叶松疏林大样地 Sparse plot of Larix gmelinii
太阳方位角 Sun azimuth (°)	0	0	0
太阳天顶角 Sun zenith (°)	40	40	40
叶片反射率(红光/近红外) Leaf reflectance (red/near-infrared)	0.015 7 / 0.437 5	0.028 0 / 0.423 9	0.015 7 / 0.437 5
叶片透射率(红光/近红外) Leaf transmissivity (red/near-infrared)	0.006 0 / 0.360 8	0.009 0 / 0.347 6	0.006 0 / 0.360 8
茎干反射率(红光/近红外) Stem reflectance (red/near-infrared)	0.087 7 / 0.243 0	0.011 4 / 0.227 5	0.087 7 / 0.243 0
茎干透射率(红光/近红外) Stem transmissivity (red/near-infrared)	0/0	0/0	0/0
背景反射率(红光/近红外) Background reflectance (red/near-infrared)	0.052 4 / 0.608 4	0.057 3 / 0.379 8	0.052 4/0.608 4
场景叶面积指数 Leaf area index of the scene	3.2	2.9	0.5
树干高 Height of the trunk (m)	16.0	8.2	16.0
冠高 Height of the canopy (m)	7.6	7.6	7.6
冠半径 Canopy radius (m)	1.75	0.95	1.75
枝倾角 Branch dip angle (°)	22.5	27.0	22.5
叶倾角 Leaf dip angle (°)	65	50	65
枝厚度 Branch thickness (m)	0.014 7	0.012 6	0.014 7
叶厚度与宽度之比 Ratio of leaf thickness to width	0.750	0.017	0.750
叶大小 Leaf size (m)	0.005	0.034	0.005
半锥顶角 Half apex angle (°)	35	-	35
簇内针的聚集度 Clumping index of shoots	1.4	-	1.4
树木分布及NEYMAN参数m₂ Tree distribution and NEYMAN parameter m₂	随机分布m₂= 1.0 Random distribution m₂= 1.0	纽曼分布m₂= 2.5 NEYMAN distribution m₂= 2.5	随机分布m₂= 1.0 Random distribution m₂= 1.0
冠型(CONE/CYLI) Crown type (CONE/CYLI)	CONE	CYLI	CONE
冠高与冠宽之比 Ratio of canopy height to width	3.0	3.9	3.0
郁闭度 Canopy density	0.7	0.7	0.1
场景大小 Scene size	100 m × 100 m	50 m × 50 m	100 m × 100 m
地表覆盖类型 Land-cover type	杜鹃 Rhododendron simsii	杜香 Ledum palustre	杜鹃 Rhododendron simsii