Research on Inversion of Forest Volume Based on Domestic High-Resolution Data

doi:10.13466/j.cnki.lyzygl.2021.03.016

Abstract

Abstract:

Taking the Wangyedian Forest Farm in Inner Mongolia as the research area,combined with ground surveys,and based on the preprocessing of the GF-2 remote sensing data,48 remote sensing factors such as spectral information,vegetation index and texture information were extracted,and 8 remote sensing factors were selected for modeling by Pearson correlation coefficient method.Using multiple linear regression,multi-layer perceptron,K-nearest neighbor,support vector machine,and random forest model to estimate the forest volume,the forest volume inversion map in the study area was obtained.The results showed that:1) Among the remote sensing factors extracted from GF-2,mean of texture features based on the second-order matrix had a higher correlation with the forest volume;2) Random Forest had better estimation accuracy of forest volume than methods such as multiple linear regression,multi-layer perceptron,K-nearest neighbor and support vector machine,and its relative root mean square error (rRMSE) was 25.40%;3) The areas with high forest volume in the study area were mainly distributed in the west and southeast;the areas with low forest volume were mainly distributed in the northwest,central and northern parts,which were consistent with the actual investigation.The domestic GF-2 image and random forest algorithm had certain potential in the inversion of forest volume.

Key words: remote sensing, GF-2, random forest, forest stock volume, spatial distribution

CLC Number:

XIAO Yue, XU Xiaodong, LONG Jiangping, LIN Hui. Research on Inversion of Forest Volume Based on Domestic High-Resolution Data[J]. FOREST RESOURCES WANAGEMENT, 2021, (3): 101-107.

Figures/Tables 6

Fig.1

Tab.1

Formulas of the vegetation index

植被指数	公式
比值植被指数	$RVI = ρ NIR / ρ RED$
差值植被指数	$DVI = ρ NIR - ρ RED$
归一化植被指数	$NDVI = (ρ NIR - ρ RED) / (ρ NIR + ρ RED)$
土壤修正植被指数	$SAVI = 1 + L (ρ NIR - ρ RED) / ρ NIR + ρ RED + L) (L =$ 0,0.25,0.5,1)
大气抗阻植被指数	$ARVI = ρ NIR - ρ RB ρ NIR + ρ RB, 其中 ρ RB = ρ RED - γ (ρ BLUE - ρ RED)$
增强型植被指数	$EVI = [2.5 (ρ NIR - ρ RED)] / ρ NIR + 6 ρ RED - 7.5 ρ BLUE + 1)$
三角植被指数	$TVI = (ρ NIR - ρ RED) / (ρ NIR + ρ RED) + 0.5$
修正简单比值植被指数	$MSR = ρ NIR / ρ RED - 1 / (ρ NIR / ρ RED + 1)$
非线性指数	$NLI = (ρ NIR 2 - ρ RED) / (ρ NIR 2 + ρ RED)$

Tab.1

Tab.2

Tab.3

Fig.2

Fig.3

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模型	RMSE/(m³/hm²)	RRMSE/%	R²
MLR	68.79	34.99	0.06
MLP	70.88	36.06	0.05
KNN	60.46	30.76	0.28
SVR	59.23	30.13	0.31
RF	49.94	25.40	0.51