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- W2185859689 abstract "ASD Spectroradiometers are widely used for objective spectral measurements in many scientific fields for years. In the field use of forest research, we have a problem of signal noise in the infrared area, especially in water band which is probably caused by weak solar intensity and/or high air moisture content. Signal noise ratio (SNR) of ASD spectroradiometer is decreased and hence make fatal data applications. According to a number of our field experiments, we found that a noisy reflectance usually occurred in the area ranges from 1350 to 1410 nm and from 1800 to 2000 nm which caused a problem in exploring the spectral characteristics of tree physiology. So, this paper aimed to resolve the noise problem by empirical modeling via field experiments of tree’s spectra for further potential uses; and only the first noisy region, i.e., 1350-1410 nm (NIR1350-1410 nm) was studied. Conifer Red Cypress trees which grow in Alishan Mountain were selected for such experimental measurements, including on field and in lab measurements. Empirical models were developed based on the lab spectra and then applied to the field spectra with noisy reflectance. Results demonstrated that sigmoid and logistic models could depict the reflectance behavior in the region of 1350-1410 nm of the Red Cypress with an R 2 of 0.99. However, the models contain significant bias which is wavelength dependent and normally distributed. It was found that integrating the Gaussian model with the sigmoid/logistic model could fit the spectral signal or noise free reflectance curve very well. Based on the test of goodness of fit, it is suggested that a 4-parameter logistic signal model combined with a 3-parameter Gaussian bias model is suitable for the application of noise removal for field measurement." @default.
- W2185859689 created "2016-06-24" @default.
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- W2185859689 date "2009-01-01" @default.
- W2185859689 modified "2023-09-26" @default.
- W2185859689 title "A SIGNAL RESTORATION METHOD FOR THE INFRARED SPECTRAL REFLECTANCE OF SPECTRORADIOMETER MEASUREMENT" @default.
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