Measurement Method for Height-Independent Vegetation Indices Based on an Active Light Source
| Autor: | Chuanlei Yang, Xueni Wu, Yongqian Ding, Xianglin Dou, Fu Xiuqing, Guoxiang Sun, Yizhuo Jiang, Hongfeng Yu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Light Nitrogen Coefficient of variation Plant Development lcsh:Chemical technology 01 natural sciences Biochemistry Standard deviation Normalized Difference Vegetation Index Article Analytical Chemistry Light source Humans lcsh:TP1-1185 Electrical and Electronic Engineering measurement method Instrumentation Triticum Mathematics Remote sensing Spectroscopy Near-Infrared Spectrometer Near-infrared spectroscopy 04 agricultural and veterinary sciences Vegetation Atomic and Molecular Physics and Optics Plant Leaves Wavelength active light source vegetation indices 040103 agronomy & agriculture 0401 agriculture forestry and fisheries reflectance spectrometer 010606 plant biology & botany |
| Zdroj: | Sensors, Vol 20, Iss 7, p 1830 (2020) Sensors Volume 20 Issue 7 Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| Popis: | A coefficient CW, which was defined as the ratio of NIR (near infrared) to the red reflected spectral response of the spectrometer, with a standard whiteboard as the measuring object, was introduced to establish a method for calculating height-independent vegetation indices (VIs). Two criteria for designing the spectrometer based on an active light source were proposed to keep CW constant. A designed spectrometer, which was equipped with an active light source, adopting 730 and 810 nm as the central wavelength of detection wavebands, was used to test the Normalized Difference Vegetation Index (NDVI) and Ratio Vegetation Index (RVI) in wheat fields with two nitrogen application rate levels (NARLs). Twenty test points were selected in each kind of field. Five measuring heights (65, 75, 85, 95, and 105 cm) were set for each test point. The mean and standard deviation of the coefficient of variation (CV) for NDVI in each test point were 3.85% and 1.39% respectively, the corresponding results for RVI were 2.93% and 1.09%. ANOVA showed the measured VIs possessed a significant ability to discriminate the NARLs and had no obvious correlation with the measurement heights. The experimental results verified the feasibility and validity of the method for measuring height-independent VIs. |
| Databáze: | OpenAIRE |
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