Hyperspectral characteristics of typical tree vegetation in central Yunnan

doi:10.3969/j.issn.1004-1524.2020.11.07

›› 2020, Vol. 32 ›› Issue (11): 1978-1986.DOI: 10.3969/j.issn.1004-1524.2020.11.07

• Horticultural Science • Previous Articles Next Articles

Hyperspectral characteristics of typical tree vegetation in central Yunnan

SONG Chunyu¹, GAN Shu^1,2,*, YUAN Xiping^2,3, HU Lin¹, LI Yan¹, YAN Xinfang¹

1. College of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Engineering Research Center for Spatial Information Surveying and Mapping Technology in Plateau and Mountain Areas of Yunnan Province, Kunming 650093, China;
3. Western Yunnan University of Applied Technology, Dali 671009, China

Received:2020-04-25 Online:2020-11-25 Published:2020-12-02

Abstract

Abstract: Using the hyperspectral remote sensing technology to extract and analyze the characteristic bands of vegetation to solve the problem of less research on tree vegetation spectrum in central Yunnan, which could be used to supplement the spectrum of tree in central Yunnan Province and provide scientific basis in identifying vegetation classification, monitoring tree growth and vegetation inversion for remote sensing. Three vegetation of Platycladus orientalis, Cinnamomum longepaniculatum and Cryptomeria fortunei in central Yunnan Province were measured in reflective spectrum by using SOV710VP surface spectrometer to analyze the difference of leaf spectral characteristics of the three vegetation, and then the original spectrum of three vegetation were processed and analyzed by using the first derivative of spectrum and continuum removal method. The original reflectance curve showed that the curve of Cryptomeria fortunei showed a downward trend in the range of 400 nm to 420 nm, which was different from Cinnamomum longepaniculatum and Platycladus orientalis. There were significant differences in reflectance values of the three vegetation between 700 nm to 760 nm. The first-order derivative of the red band spectrum highlighted unique characteristics of the peaks and valleys of three tree vegetation. The peak-valley characteristic of Platycladus orientalis was particularly prominent and the recognition was more obvious. The continuum removal transformation could highlight the differences in absorption and reflection characteristics of the three tree vegetation in the visible light band. The continuum removal values of Cinnamomum longepaniculatum and Cryptomeria fortunei varied greatly in the range of 440-760 nm and 950-1 000 nm. To a certain extent, the three vegetation could be distinguished by analyzing and comparing the original spectral characteristics and reflectivity values of the three vegetation. Through the first derivative and continuum removal transformation of spectrum, other features besides the original spectral features could be highlighted, and the characteristic band for distinguishing the three vegetation was added, which had a more remarkable effect for distinguishing and identifying the three vegetation.

Key words: vegetation, hyperspectral, feature analysis, first derivative, continuum removal

CLC Number:

S792

SONG Chunyu, GAN Shu, YUAN Xiping, HU Lin, LI Yan, YAN Xinfang. Hyperspectral characteristics of typical tree vegetation in central Yunnan[J]. , 2020, 32(11): 1978-1986.

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Hyperspectral characteristics of typical tree vegetation in central Yunnan

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