A method for estimating the amount of dead grass fuel based on spectral reflectance characteristics

光谱辐射计 环境科学 遥感 中分辨率成像光谱仪 光谱指数 草原 反射率 土壤科学 谱线 卫星 农学 光学 地质学 物理 天文 生物
作者
Zhengxiang Zhang,Hongyan Zhang,Zhiqiang Feng,Xuedong Li,Yunzhi Bi,Shi Dongkai,Daowei Zhou,Wang Yong,Jianjun Zhao
出处
期刊:International Journal of Wildland Fire [CSIRO Publishing]
卷期号:24 (7): 940-940 被引量:3
标识
DOI:10.1071/wf13149
摘要

Estimation of the amount of dead grass fuel is essential for the assessment of risk of grassland fires. This paper develops a method to estimate the amount of dead grass fuel based on spectral reflectance. Samples of soil and dead grass were collected in the Songliao Plain, China. The spectral reflectance of these samples at different densities and at various wavelengths (350–2500 nm) was measured in the laboratory. A new spectral index for dead grass was designed based on the equivalent bands of a Moderate Resolution Imaging Spectroradiometer (MODIS) satellite image. In the short-wave infrared region of the electromagnetic spectrum, an absorption feature associated with cellulose and lignin was observed at ~2100 nm in the spectra of dead grass. This absorption feature was not present in the spectra of soil. This observation provides a basis for discriminating between dead grass and soil. The dead grass fuel index created using bands 6 and 7 of MODIS correlated significantly with the field measurements of the mass of dead grass fuel (R2 = 0.84). Hence, the dead grass fuel index can be used to produce an estimate of the amount of dead grass fuel, via the regression function identified above. Such methods of estimating the amount of dead grass fuel can contribute to studies of grassland fire hazard.

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